Return to orignal label.

.gitea/workflows/build.yaml

@@ -0,0 +1,11 @@
+---
+name: MoreThanText build
+run-name: ${{ gitea.actor }} runner
+on: push
+
+jobs:
+  Build-MoreThanText:
+    runs-on: ubuntu-latest
+    steps:
+      - run: cargo test
+      - run: cargo build --release

Pipfile

@@ -11,4 +11,4 @@ black = "*"
 pylint = "*"
 
 [requires]
-python_version = "3.9"
+python_version = "3"

src/main.rs

@@ -7,7 +7,7 @@ use tide::{
 mod morethantext;
 mod settings;
 
-use morethantext::MoreThanText;
+use morethantext::{start_db, MoreThanText};
 use settings::Settings;
 
 #[async_std::main]
@@ -20,7 +20,7 @@ async fn main() -> tide::Result<()> {
 }
 
 async fn app_setup(data_dir: &str) -> tide::Server<MoreThanText> {
-    let db = MoreThanText::new(data_dir).await.unwrap();
+    let db = start_db(data_dir).await.unwrap();
     let mut app = tide::with_state(db);
     app.at("/").get(home);
     app.with(

src/morethantext/cache.rs

@@ -1,720 +1,336 @@
-use super::{DBError, Database, ErrorCode, FileData, SessionData, Store};
-use async_std::{
-    fs::{read, remove_file, write},
-    path::{Path, PathBuf},
-};
+use super::{Database, ErrorCode, FromCache, MTTError, Store, ToCache, ENTRY};
+use async_std::{channel::Receiver, path::PathBuf};
 use rand::{distributions::Alphanumeric, thread_rng, Rng};
 use std::{
-    cell::Cell,
-    slice, str,
-    time::{Duration, Instant},
+    collections::{HashMap, VecDeque},
+    iter::Iterator,
 };
 
-const ENTRY: &str = "EntryPoint";
-
-#[derive(Clone)]
-enum DataType {
-    DBMap(Store),
-    TableMap(Database),
+struct IDGenerator {
+    ids: Option<VecDeque<String>>,
 }
 
-impl DataType {
-    fn new(data_type: &str) -> Result<Self, DBError> {
-        match data_type {
-            "store" => Ok(DataType::DBMap(Store::new())),
-            "database" => Ok(DataType::TableMap(Database::new())),
-            _ => Err(DBError::from_code(ErrorCode::DataTypeIncorrect(
-                data_type.to_string(),
-            ))),
+impl IDGenerator {
+    fn new() -> Self {
+        Self { ids: None }
+    }
+
+    fn with_ids<T, D>(ids: T) -> Self
+    where
+        T: Into<Vec<D>>,
+        D: Into<String>,
+    {
+        let id_list = ids.into();
+        let mut data = VecDeque::new();
+        for id in id_list {
+            data.push_back(id.into());
+        }
+        Self { ids: Some(data) }
+    }
+}
+
+impl Iterator for IDGenerator {
+    type Item = String;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match &self.ids {
+            Some(id_list) => {
+                let mut ids = id_list.clone();
+                let output = ids.pop_front();
+                self.ids = Some(ids);
+                output
+            }
+            None => Some(thread_rng().sample_iter(&Alphanumeric).take(64).collect()),
         }
     }
 }
 
-impl SessionData for DataType {
-    fn add(&mut self, key: &str, value: &str, data: &str) -> Result<Vec<String>, DBError> {
-        match self {
-            DataType::DBMap(dbs) => dbs.add(key, value, data),
-            DataType::TableMap(_) => todo!(),
+#[cfg(test)]
+mod genid {
+    use super::*;
+
+    #[test]
+    fn unique_ids() {
+        let mut gen = IDGenerator::new();
+        let mut output: Vec<String> = Vec::new();
+        for _ in 0..10 {
+            let id = gen.next().unwrap();
+            assert!(!output.contains(&id), "{} found in {:?}", id, output);
+            output.push(id);
         }
     }
 
-    fn eq(&self, key: &str, value: &str) -> Result<Vec<String>, DBError> {
-        match self {
-            DataType::DBMap(dbs) => dbs.eq(key, value),
-            DataType::TableMap(_) => todo!(),
-        }
-    }
-
-    fn list(&self, keys: Vec<&str>) -> Result<Vec<String>, DBError> {
-        match self {
-            DataType::DBMap(dbs) => dbs.list(keys),
-            DataType::TableMap(_) => todo!(),
+    #[test]
+    fn controlled_ids() {
+        let ids = ["one", "two", "three"];
+        let mut gen = IDGenerator::with_ids(ids.clone());
+        for id in ids {
+            assert_eq!(id, gen.next().unwrap());
         }
     }
 }
 
-impl FileData<Self> for DataType {
-    fn to_bytes(&self) -> Vec<u8> {
-        let mut output = Vec::new();
-        match self {
-            DataType::DBMap(_) => output.append(&mut "DBMap".as_bytes().to_vec()),
-            DataType::TableMap(_) => output.append(&mut "TableMap".as_bytes().to_vec()),
-        }
-        output.push(0);
-        match self {
-            DataType::DBMap(store) => output.append(&mut store.to_bytes()),
-            DataType::TableMap(db) => (),
+pub struct Cache {
+    data: HashMap<String, FromCache>,
+    ids: IDGenerator,
+}
+
+impl Cache {
+    pub async fn new<P>(_dir: P) -> Self
+    where
+        P: Into<PathBuf>,
+    {
+        let mut data = HashMap::new();
+        data.insert(ENTRY.to_string(), FromCache::Str(Store::new()));
+        Self {
+            data: data,
+            ids: IDGenerator::new(),
         }
+    }
+
+    async fn with_ids<P, T, D>(dir: P, ids: T) -> Self
+    where
+        P: Into<PathBuf>,
+        T: Into<Vec<D>>,
+        D: Into<String>,
+    {
+        let mut output = Self::new(dir).await;
+        output.ids = IDGenerator::with_ids(ids);
         output
     }
 
-    fn from_bytes(data: &mut slice::Iter<u8>) -> Result<Self, DBError> {
-        let mut header: Vec<u8> = Vec::new();
+    fn next_id(&mut self) -> String {
+        let mut id: String;
         loop {
-            let letter = match data.next() {
-                Some(a) => a.clone(),
-                None => 0,
-            };
-            if letter == 0 {
-                break;
-            } else {
-                header.push(letter);
+            id = self.ids.next().unwrap();
+            match self.get(&id) {
+                FromCache::Error(_) => break,
+                _ => (),
             }
         }
-        let header = match str::from_utf8(&header) {
-            Ok(item) => item,
-            Err(_) => return Err(DBError::from_code(ErrorCode::CorruptFile)),
-        };
-        match header {
-            "DBMap" => match Store::from_bytes(data) {
-                Ok(store) => Ok(DataType::DBMap(store)),
-                Err(err) => Err(err),
-            },
-            "TableMap" => Ok(DataType::new("database").unwrap()),
-            _ => Err(DBError::from_code(ErrorCode::CorruptFile)),
-        }
+        id
     }
-}
 
-struct Entry {
-    data: DataType,
-    filename: PathBuf,
-    last_used: Cell<Instant>,
-}
-
-impl Entry {
-    async fn new<P>(filename: P, data: DataType) -> Result<Self, DBError>
-    where
-        P: Into<PathBuf>,
-    {
-        let pathbuf = filename.into();
-        if pathbuf.as_path().exists().await {
-            return Err(DBError::from_code(ErrorCode::EntryExists(pathbuf)));
-        } else {
-            match write(&pathbuf, data.to_bytes()).await {
-                Ok(_) => (),
-                Err(err) => {
-                    let mut error = DBError::from_code(ErrorCode::EntryWriteFailure(pathbuf));
-                    error.add_source(err);
-                    return Err(error);
+    pub async fn listen(&mut self, listener: Receiver<ToCache>) {
+        loop {
+            match listener.recv().await.unwrap() {
+                ToCache::Get(data) => {
+                    data.result.send(self.get(data.data)).await.unwrap();
+                }
+                ToCache::Commit(data) => {
+                    data.result.send(self.commit(data.data)).await.unwrap();
                 }
             }
         }
-        Ok(Self {
-            data: data,
-            filename: pathbuf,
-            last_used: Cell::new(Instant::now()),
-        })
     }
 
-    async fn get<P>(filename: P) -> Result<Self, DBError>
+    pub fn get<S>(&self, id: S) -> FromCache
     where
-        P: Into<PathBuf>,
+        S: Into<String>,
     {
-        let pathbuf = filename.into();
-        let content = match read(&pathbuf).await {
-            Ok(text) => text,
-            Err(err) => {
-                let mut error = DBError::from_code(ErrorCode::EntryReadFailure(pathbuf));
-                error.add_source(err);
-                return Err(error);
-            }
-        };
-        let data = match DataType::from_bytes(&mut content.iter()) {
-            Ok(raw) => raw,
-            Err(err) => {
-                let mut error = DBError::from_code(ErrorCode::EntryReadFailure(pathbuf));
-                error.add_source(err);
-                return Err(error);
-            }
-        };
-        Ok(Self {
-            data: data,
-            filename: pathbuf,
-            last_used: Cell::new(Instant::now()),
-        })
+        let idd = id.into();
+        match self.data.get(&idd) {
+            Some(data) => data.clone(),
+            None => FromCache::Error(MTTError::from_code(ErrorCode::IDNotFound(idd))),
+        }
     }
 
-    fn elapsed(&self) -> Duration {
-        self.last_used.get().elapsed()
-    }
-
-    fn data(&self) -> DataType {
-        self.last_used.set(Instant::now());
-        self.data.clone()
-    }
-
-    async fn update(&mut self, data: DataType) -> Result<(), DBError> {
-        self.last_used.set(Instant::now());
-        match write(&self.filename, data.to_bytes()).await {
-            Ok(_) => (),
-            Err(err) => {
-                let mut error =
-                    DBError::from_code(ErrorCode::EntryWriteFailure(self.filename.clone()));
-                error.add_source(err);
-                return Err(error);
+    pub fn commit(&mut self, data: Store) -> FromCache {
+        let entry_data = self.data.get(ENTRY).unwrap();
+        let mut store = match entry_data {
+            FromCache::Str(ep) => ep.clone(),
+            _ => {
+                unreachable!()
             }
         };
-        self.data = data;
+        for name in data.list() {
+            let id = self.next_id();
+            match store.add_by_id(name, &id) {
+                Ok(_) => {
+                    self.data.insert(id, FromCache::DB(Database::new()));
+                }
+                Err(err) => return FromCache::Error(err),
+            }
+        }
+        self.data
+            .insert(ENTRY.to_string(), FromCache::Str(store))
+            .unwrap();
+        FromCache::Ok
+    }
+}
+
+#[cfg(test)]
+mod engine {
+    use super::*;
+    use tempfile::tempdir;
+
+    #[async_std::test]
+    async fn get_entry() {
+        let dir = tempdir().unwrap();
+        let cache = Cache::new(dir.path()).await;
+        let expected: Vec<String> = Vec::new();
+        let result = cache.get(ENTRY);
+        match result {
+            FromCache::Str(store) => assert_eq!(store.list(), expected),
+            _ => assert!(false, "{:?} should be FromCache::Str", result),
+        }
+    }
+
+    #[async_std::test]
+    async fn get_bad_entry() -> Result<(), MTTError> {
+        let dir = tempdir().unwrap();
+        let cache = Cache::new(dir.path()).await;
+        let ids = ["bad1", "bad2"];
+        for id in ids {
+            let output = cache.get(id);
+            match output {
+                FromCache::Error(err) => match err.code {
+                    ErrorCode::IDNotFound(_) => {
+                        assert!(
+                            err.to_string().contains(id),
+                            "Had error: {}, Did not contain: {}",
+                            err.to_string(),
+                            id
+                        );
+                    }
+                    _ => return Err(MTTError::new(format!("{:?} is not IDNotFound", err.code))),
+                },
+                _ => {
+                    return Err(MTTError::new(format!(
+                        "{:?} is not FromCache::Error",
+                        output
+                    )))
+                }
+            }
+        }
         Ok(())
     }
 
-    async fn remove(&self) -> Result<(), DBError> {
-        match remove_file(&self.filename).await {
-            Ok(_) => Ok(()),
-            Err(err) => {
-                let mut error =
-                    DBError::from_code(ErrorCode::EntryDeleteFailure(self.filename.clone()));
-                error.add_source(err);
-                Err(error)
-            }
-        }
-    }
-}
-
-struct Cache;
-
-impl Cache {
-    async fn new<P>(dir: P) -> Result<Self, DBError>
-    where
-        P: Into<PathBuf>,
-    {
-        let pathbuf = dir.into();
-        let entry = pathbuf.as_path().join(ENTRY);
-        match Entry::get(entry.clone()).await {
-            Ok(_) => Ok(Self {}),
-            Err(_) => {
-                let store = DataType::new("store").unwrap();
-                match Entry::new(entry, store).await {
-                    Ok(_) => Ok(Self {}),
-                    Err(err) => {
-                        let mut error = DBError::from_code(ErrorCode::CacheReadWrite);
-                        error.add_source(err);
-                        Err(error)
-                    }
-                }
-            }
-        }
-    }
-}
-
-#[cfg(test)]
-mod datatype {
-    use super::*;
-
-    #[test]
-    fn bad_data_type() -> Result<(), DBError> {
-        let dt = "bufcuss";
-        match DataType::new(dt) {
-            Ok(_) => Err(DBError::new("should have produced an error")),
-            Err(err) => match err.code {
-                ErrorCode::DataTypeIncorrect(value) => {
-                    assert_eq!(value, dt, "Incorrect input value");
-                    Ok(())
-                }
-                _ => {
-                    let mut error = DBError::new("incorrect error");
-                    error.add_source(err);
-                    Err(error)
-                }
-            },
-        }
-    }
-
-    #[test]
-    fn create_store() -> Result<(), DBError> {
-        match DataType::new("store") {
-            Ok(dt) => match dt {
-                DataType::DBMap(_) => Ok(()),
-                _ => Err(DBError::new("incorrect data type")),
-            },
-            Err(err) => Err(err),
-        }
-    }
-
-    #[test]
-    fn create_database() -> Result<(), DBError> {
-        match DataType::new("database") {
-            Ok(dt) => match dt {
-                DataType::TableMap(_) => Ok(()),
-                _ => Err(DBError::new("incorrect data type")),
-            },
-            Err(err) => Err(err),
-        }
-    }
-}
-
-#[cfg(test)]
-mod datatype_sesssion {
-    use super::*;
-
-    #[test]
-    fn update_storage() {
-        let mut dbs = DataType::new("store").unwrap();
-        let name = "new_database";
-        let id = "someid";
-        dbs.add("database", name, id).unwrap();
-        assert_eq!(dbs.eq("database", name).unwrap(), [id].to_vec());
-        assert_eq!(dbs.list(["database"].to_vec()).unwrap(), [name].to_vec());
-    }
-}
-
-#[cfg(test)]
-mod datatype_file {
-    use super::*;
-
-    #[test]
-    fn new_store_bytes() {
-        let dbs = DataType::new("store").unwrap();
-        let mut expected = "DBMap".as_bytes().to_vec();
-        expected.push(0);
-        assert_eq!(dbs.to_bytes(), expected);
-    }
-
-    #[test]
-    fn store_bytes_with_info() {
-        let name = "title";
-        let id = "king";
+    #[async_std::test]
+    async fn commit_database() {
+        // remove this one for the one below, maybe.
+        let dir = tempdir().unwrap();
+        let mut cache = Cache::new(dir.path()).await;
         let mut store = Store::new();
-        let mut dt_store = DataType::new("store").unwrap();
-        let mut expected = dt_store.to_bytes();
-        store.add("database", name, id).unwrap();
-        expected.append(&mut store.to_bytes());
-        dt_store.add("database", name, id).unwrap();
-        assert_eq!(dt_store.to_bytes(), expected);
+        let db = "garfield";
+        store.add(db).unwrap();
+        cache.commit(store.clone());
+        let output = cache.get(ENTRY);
+        match output {
+            FromCache::Str(result) => assert_eq!(result.list(), store.list()),
+            _ => assert!(false, "{:?} is not FromCache::Str", output),
+        }
     }
 
-    #[test]
-    fn read_empty_store() {
-        let dt_store = DataType::new("store").unwrap();
-        let data = dt_store.to_bytes();
-        let mut feed = data.iter();
-        let output = DataType::from_bytes(&mut feed).unwrap();
+    #[async_std::test]
+    async fn add_database_entry() {
+        let id = "an_id";
+        let name = "garfield";
+        let dir = tempdir().unwrap();
+        let mut cache = Cache::with_ids(dir.path(), [id]).await;
+        let mut store = Store::new();
+        store.add(name).unwrap();
+        cache.commit(store.clone());
+        let db_out = cache.get(id);
+        match db_out {
+            FromCache::DB(_) => (),
+            _ => assert!(
+                false,
+                "{:?} is not FromCache::DB -- cache is {:?}",
+                db_out, cache.data
+            ),
+        }
+        let store_out = cache.get(ENTRY);
+        match store_out {
+            FromCache::Str(updated_store) => match updated_store.get(name) {
+                Some(output) => {
+                    assert_eq!(output.id, Some(id.to_string()));
+                    assert!(output.data.is_none(), "Should have removed the database.");
+                }
+                None => assert!(true, "Store should have stored the database."),
+            },
+            _ => assert!(
+                false,
+                "{:?} is not FromCache::Str -- cache is {:?}",
+                db_out, cache.data
+            ),
+        }
+    }
+
+    #[async_std::test]
+    async fn ids_are_not_overwritten() {
+        let ids = ["first", "first", "second"];
+        let names = ["barney", "fred"];
+        let dir = tempdir().unwrap();
+        let mut cache = Cache::with_ids(dir.path(), ids).await;
+        let mut store1 = Store::new();
+        store1.add(names[0]).unwrap();
+        let mut store2 = Store::new();
+        store2.add(names[1]).unwrap();
+        cache.commit(store1);
+        cache.commit(store2);
         assert_eq!(
-            dt_store.list(["database"].to_vec()).unwrap(),
-            output.list(["database"].to_vec()).unwrap()
+            cache.data.len(),
+            3,
+            "cache.data had the following entries {:?}",
+            cache.data.keys()
         );
     }
 
-    #[test]
-    fn read_store_info() {
-        let mut dt_store = DataType::new("store").unwrap();
-        dt_store.add("database", "raven", "beastboy").unwrap();
-        let data = dt_store.to_bytes();
-        let mut feed = data.iter();
-        let output = DataType::from_bytes(&mut feed).unwrap();
-        assert_eq!(
-            dt_store.list(["database"].to_vec()).unwrap(),
-            output.list(["database"].to_vec()).unwrap()
-        );
-    }
-
-    #[test]
-    fn new_database_bytes() {
-        let db = DataType::new("database").unwrap();
-        let mut expected = "TableMap".as_bytes().to_vec();
-        expected.push(0);
-        assert_eq!(db.to_bytes(), expected);
-    }
-
-    #[test]
-    fn read_empty_database() {
-        let dt = DataType::new("database").unwrap();
-        let data = dt.to_bytes();
-        let mut feed = data.iter();
-        match DataType::from_bytes(&mut feed).unwrap() {
-            DataType::TableMap(_) => (),
-            _ => assert!(false, "Incorrect data type"),
-        }
-    }
-
-    #[test]
-    fn read_bad_header() -> Result<(), DBError> {
-        let data = "sdghsdl".as_bytes().to_vec();
-        let mut feed = data.iter();
-        match DataType::from_bytes(&mut feed) {
-            Ok(_) => Err(DBError::new("should have raised an error")),
-            Err(err) => match err.code {
-                ErrorCode::CorruptFile => Ok(()),
-                _ => Err(DBError::new("incorrect error")),
-            },
-        }
-    }
-
-    #[test]
-    fn read_bad_store() -> Result<(), DBError> {
-        let mut data = "DBMap".as_bytes().to_vec();
-        data.push(0);
-        data.append(&mut "sdfgs".as_bytes().to_vec());
-        let mut feed = data.iter();
-        match DataType::from_bytes(&mut feed) {
-            Ok(_) => Err(DBError::new("should have raised an error")),
-            Err(err) => match err.code {
-                ErrorCode::CorruptFile => Ok(()),
-                _ => Err(DBError::new("incorrect error code")),
-            },
-        }
+    #[async_std::test]
+    async fn no_duplicate_ids() {
+        let ids = ["one", "two"];
+        let dir = tempdir().unwrap();
+        let mut cache = Cache::with_ids(dir.path(), ids).await;
+        cache
+            .data
+            .insert(ids[0].to_string(), FromCache::DB(Database::new()));
+        assert_eq!(cache.next_id(), ids[1]);
     }
 }
 
 #[cfg(test)]
-mod entry {
-    use super::*;
-    use std::error::Error;
+mod messages {
+    use super::{
+        super::{start_db, ToCacheMsg},
+        *,
+    };
+    use async_std::channel::unbounded;
     use tempfile::tempdir;
 
     #[async_std::test]
-    async fn get_elapsed_time() {
+    async fn get_the_store() {
         let dir = tempdir().unwrap();
-        let data = DataType::new("store").unwrap();
-        let filepath = dir.path().join("count");
-        let filename = filepath.to_str().unwrap();
-        let item = Entry::new(filename.to_string(), data).await.unwrap();
-        assert!(
-            Duration::from_secs(1) > item.elapsed(),
-            "last_used should have been now."
-        );
-        item.last_used
-            .set(Instant::now() - Duration::from_secs(500));
-        assert!(
-            Duration::from_secs(499) < item.elapsed(),
-            "The duration should have increased."
-        );
-    }
-
-    #[async_std::test]
-    async fn create() {
-        let dir = tempdir().unwrap();
-        let mut data = DataType::new("store").unwrap();
-        data.add("database", "roger", "moore").unwrap();
-        let filepath = dir.path().join("wiliam");
-        let filename = filepath.to_str().unwrap();
-        let item = Entry::new(filename.to_string(), data.clone())
-            .await
-            .unwrap();
-        assert!(
-            Duration::from_secs(1) > item.elapsed(),
-            "last_used should have been now."
-        );
-        let output = item.data();
-        assert_eq!(
-            data.list(["database"].to_vec()).unwrap(),
-            output.list(["database"].to_vec()).unwrap()
-        );
-        assert!(filepath.is_file(), "Should have created the entry file.");
-        let content = read(&filepath).await.unwrap();
-        assert_eq!(content, data.to_bytes());
-    }
-
-    #[async_std::test]
-    async fn create_errors_on_bad_files() -> Result<(), DBError> {
-        let dir = tempdir().unwrap();
-        let data = DataType::new("store").unwrap();
-        let filepath = dir.path().join("bad").join("path");
-        let filename = filepath.to_str().unwrap();
-        match Entry::new(filename.to_string(), data).await {
-            Ok(_) => Err(DBError::new("bad file names should raise an error")),
-            Err(err) => match err.code {
-                ErrorCode::EntryWriteFailure(_) => {
-                    assert!(err.source().is_some(), "Must include the source error.");
-                    assert!(err
-                        .source()
-                        .unwrap()
-                        .to_string()
-                        .contains("could not write to file"));
-                    Ok(())
-                }
-                _ => Err(DBError::new("incorrect error code")),
-            },
+        let mtt = start_db(dir.path()).await.unwrap();
+        let in_s = mtt.to_cache.clone();
+        let (out_s, out_r) = unbounded();
+        let msg = ToCacheMsg {
+            data: ENTRY.to_string(),
+            result: out_s,
+        };
+        in_s.send(ToCache::Get(msg)).await.unwrap();
+        let result = out_r.recv().await.unwrap();
+        match result {
+            FromCache::Str(_) => (),
+            _ => assert!(false, "{:?} is not FromCache::Str", result),
         }
     }
 
     #[async_std::test]
-    async fn create_does_not_over_writes() -> Result<(), DBError> {
+    async fn get_bad_id() {
         let dir = tempdir().unwrap();
-        let id = "wicked";
-        let file = dir.path().join(id);
-        let filename = file.to_str().unwrap();
-        write(&file, b"previous").await.unwrap();
-        let data = DataType::new("store").unwrap();
-        match Entry::new(filename.to_string(), data).await {
-            Ok(_) => {
-                return Err(DBError::new(
-                    "Should produce an error for an existing Entry",
-                ))
-            }
-            Err(err) => match err.code {
-                ErrorCode::EntryExists(_) => Ok(()),
-                _ => Err(DBError::new("incorrect error code")),
-            },
-        }
-    }
-
-    #[async_std::test]
-    async fn get_updates_last_used() {
-        let dir = tempdir().unwrap();
-        let data = DataType::new("store").unwrap();
-        let filepath = dir.path().join("holder");
-        let filename = filepath.to_str().unwrap();
-        let item = Entry::new(filename.to_string(), data).await.unwrap();
-        item.last_used
-            .set(Instant::now() - Duration::from_secs(300));
-        item.data();
-        assert!(
-            Duration::from_secs(1) > item.elapsed(),
-            "last_used should have been reset."
-        );
-    }
-
-    #[async_std::test]
-    async fn update_entry() {
-        let dir = tempdir().unwrap();
-        let mut data = DataType::new("store").unwrap();
-        let filepath = dir.path().join("changing");
-        let filename = filepath.to_str().unwrap();
-        let mut item = Entry::new(filename.to_string(), data.clone())
-            .await
-            .unwrap();
-        item.last_used
-            .set(Instant::now() - Duration::from_secs(500));
-        data.add("database", "new", "stuff").unwrap();
-        item.update(data.clone()).await.unwrap();
-        assert!(
-            Duration::from_secs(1) > item.elapsed(),
-            "last_used should have been reset."
-        );
-        let output = item.data();
-        assert_eq!(
-            data.list(["database"].to_vec()).unwrap(),
-            output.list(["database"].to_vec()).unwrap()
-        );
-        let content = read(&filepath).await.unwrap();
-        assert_eq!(content, data.to_bytes());
-    }
-
-    #[async_std::test]
-    async fn update_write_errors() -> Result<(), DBError> {
-        let dir = tempdir().unwrap();
-        let data = DataType::new("store").unwrap();
-        let filepath = dir.path().join("changing");
-        let filename = filepath.to_str().unwrap();
-        let mut item = Entry::new(filename.to_string(), data.clone())
-            .await
-            .unwrap();
-        drop(dir);
-        match item.update(data).await {
-            Ok(_) => Err(DBError::new("file writes should return an error")),
-            Err(err) => match err.code {
-                ErrorCode::EntryWriteFailure(_) => {
-                    assert!(err.source().is_some(), "Must include the source error.");
-                    assert!(err
-                        .source()
-                        .unwrap()
-                        .to_string()
-                        .contains("could not write to file"));
-                    Ok(())
-                }
-                _ => Err(DBError::new("incorrect error code")),
-            },
-        }
-    }
-
-    #[async_std::test]
-    async fn retrieve() {
-        let dir = tempdir().unwrap();
-        let mut data = DataType::new("store").unwrap();
-        data.add("database", "something_old", "3.14159").unwrap();
-        let filepath = dir.path().join("existing");
-        let filename = filepath.to_str().unwrap();
-        let item = Entry::new(filename.to_string(), data.clone())
-            .await
-            .unwrap();
-        let output = Entry::get(filename).await.unwrap();
-        assert_eq!(
-            output.data().list(["database"].to_vec()).unwrap(),
-            data.list(["database"].to_vec()).unwrap()
-        );
-        assert_eq!(output.filename.to_str().unwrap(), filename);
-        assert!(
-            Duration::from_secs(1) > item.elapsed(),
-            "last_used should have been reset."
-        );
-    }
-
-    #[async_std::test]
-    async fn retrieve_file_missing() -> Result<(), DBError> {
-        let dir = tempdir().unwrap();
-        let filepath = dir.path().join("justnotthere");
-        let filename = filepath.to_str().unwrap();
-        match Entry::get(filename).await {
-            Ok(_) => Err(DBError::new("should have returned an error")),
-            Err(err) => match err.code {
-                ErrorCode::EntryReadFailure(_) => {
-                    assert!(err.source().is_some(), "Error should have a source.");
-                    assert!(
-                        err.source()
-                            .unwrap()
-                            .to_string()
-                            .contains("could not read file"),
-                        "Source Error Message: {}",
-                        err.source().unwrap().to_string()
-                    );
-                    Ok(())
-                }
-                _ => Err(DBError::new("incorrect error code")),
-            },
-        }
-    }
-
-    #[async_std::test]
-    async fn retrieve_corrupt_file() -> Result<(), DBError> {
-        let dir = tempdir().unwrap();
-        let filepath = dir.path().join("garbage");
-        let filename = filepath.to_str().unwrap();
-        write(&filepath, b"jhsdfghlsdf").await.unwrap();
-        match Entry::get(filename).await {
-            Ok(_) => Err(DBError::new("should have returned an error")),
-            Err(err) => match err.code {
-                ErrorCode::EntryReadFailure(_) => {
-                    assert!(err.source().is_some(), "Error should have a source.");
-                    assert!(
-                        err.source().unwrap().to_string().contains("corrupt file"),
-                        "Source Error Message: {}",
-                        err.source().unwrap().to_string()
-                    );
-                    Ok(())
-                }
-                _ => Err(DBError::new("incorrect error code")),
-            },
-        }
-    }
-
-    #[async_std::test]
-    async fn delete() {
-        let dir = tempdir().unwrap();
-        let filepath = dir.path().join("byebye");
-        let filename = filepath.to_str().unwrap();
-        let data = DataType::new("store").unwrap();
-        let item = Entry::new(filename.to_string(), data.clone())
-            .await
-            .unwrap();
-        item.remove().await.unwrap();
-        assert!(!filepath.exists(), "Entry file should be removed.");
-    }
-
-    #[async_std::test]
-    async fn delete_bad_file() -> Result<(), DBError> {
-        let dir = tempdir().unwrap();
-        let filepath = dir.path().join("itsnotthere");
-        let filename = filepath.to_str().unwrap();
-        let data = DataType::new("store").unwrap();
-        let item = Entry::new(filename.to_string(), data.clone())
-            .await
-            .unwrap();
-        remove_file(filename).await.unwrap();
-        match item.remove().await {
-            Ok(_) => Err(DBError::new("should have produced an error")),
-            Err(err) => match err.code {
-                ErrorCode::EntryDeleteFailure(_) => {
-                    assert!(err.source().is_some(), "Error should have a source.");
-                    assert!(
-                        err.source()
-                            .unwrap()
-                            .to_string()
-                            .contains("could not remove file"),
-                        "Source Error Message: {}",
-                        err.source().unwrap().to_string()
-                    );
-                    Ok(())
-                }
-                _ => Err(DBError::new("incorrect error code")),
-            },
-        }
-    }
-}
-
-#[cfg(test)]
-mod cache {
-    use super::*;
-    use std::error::Error;
-    use tempfile::tempdir;
-
-    #[async_std::test]
-    async fn create() {
-        let dir = tempdir().unwrap();
-        Cache::new(dir.path().to_str().unwrap()).await.unwrap();
-        let epoint = dir.path().join(ENTRY);
-        assert!(
-            epoint.is_file(),
-            "{} did not get created.",
-            epoint.display()
-        );
-        let entry = Entry::get(epoint.to_str().unwrap()).await.unwrap();
-        assert_eq!(
-            entry.data().list(["database"].to_vec()).unwrap(),
-            Vec::<String>::new()
-        );
-    }
-
-    #[async_std::test]
-    async fn entry_failure() -> Result<(), DBError> {
-        let dir = tempdir().unwrap();
-        let path = dir.path().join("bad").join("path");
-        match Cache::new(path).await {
-            Ok(_) => Err(DBError::new("Should have produced an error.")),
-            Err(err) => match err.code {
-                ErrorCode::CacheReadWrite => {
-                    assert!(err.source().is_some(), "Error should have a source.");
-                    assert!(
-                        err.source().unwrap().to_string().contains("write failure"),
-                        "Source Error Message: {}",
-                        err.source().unwrap().to_string()
-                    );
-                    Ok(())
-                }
-                _ => Err(DBError::new("incorrect error code")),
-            },
-        }
-    }
-
-    #[async_std::test]
-    async fn existing_entry_point() {
-        let dir = tempdir().unwrap();
-        let data = DataType::new("store").unwrap();
-        Entry::new(dir.path().join(ENTRY), data.clone())
-            .await
-            .unwrap();
-        let cache = Cache::new(dir.path()).await.unwrap();
-    }
-
-    #[async_std::test]
-    async fn corrupt_enty_point() -> Result<(), DBError> {
-        let dir = tempdir().unwrap();
-        let file = dir.path().join(ENTRY);
-        write(file, b"Really bad data.").await.unwrap();
-        match Cache::new(dir.path()).await {
-            Ok(_) => Err(DBError::new("should have errored")),
-            Err(_) => Ok(()),
+        let mtt = start_db(dir.path()).await.unwrap();
+        let in_s = mtt.to_cache.clone();
+        let (out_s, out_r) = unbounded();
+        let msg = ToCacheMsg {
+            data: "bad_id!".to_string(),
+            result: out_s,
+        };
+        in_s.send(ToCache::Get(msg)).await.unwrap();
+        let output = out_r.recv().await.unwrap();
+        match output {
+            FromCache::Error(_) => (),
+            _ => assert!(false, "{:?} is not FromCache::Error", output),
         }
     }
 }

src/morethantext/database-old.rs

@@ -0,0 +1,36 @@
+use super::{DBError, FileData, SessionData};
+use std::slice;
+
+#[derive(Clone)]
+pub struct Database;
+
+impl Database {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl FileData<Self> for Database {
+    fn to_bytes(&self) -> Vec<u8> {
+        let output = Vec::new();
+        output
+    }
+
+    fn from_bytes(_data: &mut slice::Iter<u8>) -> Result<Self, DBError> {
+        Ok(Self {})
+    }
+}
+
+impl SessionData for Database {
+    fn add(&mut self, _key: &str, _value: &str, _data: &str) -> Result<Vec<String>, DBError> {
+        Ok(Vec::new())
+    }
+
+    fn eq(&self, _key: &str, _value: &str) -> Result<Vec<String>, DBError> {
+        Ok(Vec::new())
+    }
+
+    fn list(&self, _keys: Vec<&str>) -> Result<Vec<String>, DBError> {
+        Ok(Vec::new())
+    }
+}

src/morethantext/database.rs

@@ -1,36 +1,171 @@
-use super::{DBError, ErrorCode, FileData, SessionData, Store};
-use std::slice;
+use super::{Data, ErrorCode, MTTError, Table};
+use std::collections::HashMap;
 
-#[derive(Clone)]
-pub struct Database;
+#[derive(Clone, Debug)]
+pub struct Database {
+    data: HashMap<String, Data<Table>>,
+}
 
 impl Database {
     pub fn new() -> Self {
-        Self
+        Self {
+            data: HashMap::new(),
+        }
+    }
+
+    pub fn add<S>(&mut self, name: S) -> Result<(), MTTError>
+    where
+        S: Into<String>,
+    {
+        let db_name = name.into();
+        match self.get(&db_name) {
+            Some(_) => Err(MTTError::from_code(ErrorCode::DuplicateTable(db_name))),
+            None => {
+                self.data.insert(db_name, Data::from_data(Table::new()));
+                Ok(())
+            }
+        }
+    }
+
+    pub fn add_by_id<S, D>(&mut self, name: S, id: D) -> Result<(), MTTError>
+    where
+        S: Into<String>,
+        D: Into<String>,
+    {
+        let db_name = name.into();
+        match self.get(&db_name) {
+            Some(_) => Err(MTTError::from_code(ErrorCode::DuplicateTable(db_name))),
+            None => {
+                self.data.insert(db_name, Data::from_id(id.into()));
+                Ok(())
+            }
+        }
+    }
+
+    pub fn get(&self, name: &str) -> Option<&Data<Table>> {
+        self.data.get(name)
+    }
+
+    pub fn list(&self) -> Vec<String> {
+        let mut names = Vec::new();
+        for name in self.data.keys() {
+            names.push(name.to_string());
+        }
+        names.sort();
+        names
     }
 }
 
-impl FileData<Self> for Database {
-    fn to_bytes(&self) -> Vec<u8> {
-        let output = Vec::new();
-        output
+#[cfg(test)]
+mod databases {
+    use super::*;
+
+    #[test]
+    fn create_new() {
+        let db = Database::new();
+        let expected: Vec<String> = Vec::new();
+        assert_eq!(db.list(), expected);
     }
 
-    fn from_bytes(data: &mut slice::Iter<u8>) -> Result<Self, DBError> {
-        Ok(Self {})
-    }
-}
-
-impl SessionData for Database {
-    fn add(&mut self, key: &str, value: &str, data: &str) -> Result<Vec<String>, DBError> {
-        Ok(Vec::new())
-    }
-
-    fn eq(&self, key: &str, value: &str) -> Result<Vec<String>, DBError> {
-        Ok(Vec::new())
-    }
-
-    fn list(&self, keys: Vec<&str>) -> Result<Vec<String>, DBError> {
-        Ok(Vec::new())
+    #[test]
+    fn add_db_by_str() {
+        let mut db = Database::new();
+        let name = "Melvin";
+        db.add(name).unwrap();
+        let output = db.get(name);
+        assert!(output.is_some(), "Get returned none.");
+    }
+
+    #[test]
+    fn add_db_by_string() {
+        let mut db = Database::new();
+        let name = "Marvin";
+        db.add(name.to_string()).unwrap();
+        let output = db.get(name);
+        assert!(output.is_some(), "Get returned none.");
+    }
+
+    #[test]
+    fn fail_on_duplicates() -> Result<(), MTTError> {
+        let mut db = Database::new();
+        let name = "Mickie";
+        db.add(name).unwrap();
+        match db.add(name) {
+            Ok(_) => Err(MTTError::new("duplicates should error")),
+            Err(err) => match err.code {
+                ErrorCode::DuplicateTable(db_name) => {
+                    assert_eq!(db_name, name);
+                    Ok(())
+                }
+                _ => Err(MTTError::new(format!("{:?} is not DuplicateTable", err))),
+            },
+        }
+    }
+
+    #[test]
+    fn add_using_cache_id() {
+        let mut db = Database::new();
+        let name = "fred";
+        let id = "12345";
+        db.add_by_id(name, id).unwrap();
+        let output = db.get(name).unwrap();
+        assert!(output.data.is_none(), "there should be no data");
+        assert_eq!(output.id, Some(id.to_string()));
+    }
+
+    #[test]
+    fn add_by_cache_id_name_string() {
+        let mut db = Database::new();
+        let name = "barney";
+        let id = "67890";
+        db.add_by_id(name.to_string(), id).unwrap();
+        let output = db.get(name).unwrap();
+        assert!(output.data.is_none(), "there should be no data");
+        assert_eq!(output.id, Some(id.to_string()));
+    }
+
+    #[test]
+    fn no_duplicate_databases_for_add_by_id() {
+        let mut db = Database::new();
+        let name = "betty";
+        db.add_by_id(name, "fghij").unwrap();
+        match db.add_by_id(name, "klmno") {
+            Ok(_) => assert!(false, "Duplicates should error."),
+            Err(err) => match err.code {
+                ErrorCode::DuplicateTable(db_name) => assert_eq!(db_name, name),
+                _ => assert!(false, "{:?} is not DuplicateTable", err),
+            },
+        }
+    }
+
+    #[test]
+    fn add_by_cache_id_string() {
+        let mut db = Database::new();
+        let name = "wilma";
+        let id = "abcdef";
+        db.add_by_id(name, id.to_string()).unwrap();
+        let output = db.get(name).unwrap();
+        assert!(output.data.is_none(), "there should be no data");
+        assert_eq!(output.id, Some(id.to_string()));
+    }
+
+    #[test]
+    fn get_bad_database() -> Result<(), MTTError> {
+        let db = Database::new();
+        match db.get("missing") {
+            Some(_) => Err(MTTError::new("Should have returned None.")),
+            None => Ok(()),
+        }
+    }
+
+    #[test]
+    fn get_list() {
+        let mut db = Database::new();
+        let mut ids = ["one", "two", "three", "four", "five"];
+        for name in ids {
+            db.add(name.to_string()).unwrap();
+        }
+        ids.sort();
+        assert_eq!(db.list(), ids);
     }
 }

src/morethantext/entry.rs

@@ -0,0 +1,381 @@
+use super::{DBError, DataType, ErrorCode, FileData, SessionData};
+use async_std::{
+    fs::{read, remove_file, write},
+    path::PathBuf,
+};
+use std::{
+    cell::Cell,
+    time::{Duration, Instant},
+};
+
+pub struct Entry {
+    data: DataType,
+    filename: PathBuf,
+    last_used: Cell<Instant>,
+}
+
+impl Entry {
+    pub async fn new<P>(filename: P, data: DataType) -> Result<Self, DBError>
+    where
+        P: Into<PathBuf>,
+    {
+        let pathbuf = filename.into();
+        if pathbuf.as_path().exists().await {
+            return Err(DBError::from_code(ErrorCode::EntryExists(pathbuf)));
+        } else {
+            match write(&pathbuf, data.to_bytes()).await {
+                Ok(_) => (),
+                Err(err) => {
+                    let mut error = DBError::from_code(ErrorCode::EntryWriteFailure(pathbuf));
+                    error.add_source(err);
+                    return Err(error);
+                }
+            }
+        }
+        Ok(Self {
+            data: data,
+            filename: pathbuf,
+            last_used: Cell::new(Instant::now()),
+        })
+    }
+
+    pub async fn get<P>(filename: P) -> Result<Self, DBError>
+    where
+        P: Into<PathBuf>,
+    {
+        let pathbuf = filename.into();
+        let content = match read(&pathbuf).await {
+            Ok(text) => text,
+            Err(err) => {
+                let mut error = DBError::from_code(ErrorCode::EntryReadFailure(pathbuf));
+                error.add_source(err);
+                return Err(error);
+            }
+        };
+        let data = match DataType::from_bytes(&mut content.iter()) {
+            Ok(raw) => raw,
+            Err(err) => {
+                let mut error = DBError::from_code(ErrorCode::EntryReadFailure(pathbuf));
+                error.add_source(err);
+                return Err(error);
+            }
+        };
+        Ok(Self {
+            data: data,
+            filename: pathbuf,
+            last_used: Cell::new(Instant::now()),
+        })
+    }
+
+    pub fn elapsed(&self) -> Duration {
+        self.last_used.get().elapsed()
+    }
+
+    pub fn data(&self) -> DataType {
+        self.last_used.set(Instant::now());
+        self.data.clone()
+    }
+
+    async fn update(&mut self, data: DataType) -> Result<(), DBError> {
+        self.last_used.set(Instant::now());
+        match write(&self.filename, data.to_bytes()).await {
+            Ok(_) => (),
+            Err(err) => {
+                let mut error =
+                    DBError::from_code(ErrorCode::EntryWriteFailure(self.filename.clone()));
+                error.add_source(err);
+                return Err(error);
+            }
+        };
+        self.data = data;
+        Ok(())
+    }
+
+    async fn remove(&self) -> Result<(), DBError> {
+        match remove_file(&self.filename).await {
+            Ok(_) => Ok(()),
+            Err(err) => {
+                let mut error =
+                    DBError::from_code(ErrorCode::EntryDeleteFailure(self.filename.clone()));
+                error.add_source(err);
+                Err(error)
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod entry {
+    use super::*;
+    use std::error::Error;
+    use tempfile::tempdir;
+
+    #[async_std::test]
+    async fn get_elapsed_time() {
+        let dir = tempdir().unwrap();
+        let data = DataType::new("store").unwrap();
+        let filepath = dir.path().join("count");
+        let filename = filepath.to_str().unwrap();
+        let item = Entry::new(filename.to_string(), data).await.unwrap();
+        assert!(
+            Duration::from_secs(1) > item.elapsed(),
+            "last_used should have been now."
+        );
+        item.last_used
+            .set(Instant::now() - Duration::from_secs(500));
+        assert!(
+            Duration::from_secs(499) < item.elapsed(),
+            "The duration should have increased."
+        );
+    }
+
+    #[async_std::test]
+    async fn create() {
+        let dir = tempdir().unwrap();
+        let mut data = DataType::new("store").unwrap();
+        data.add("database", "roger", "moore").unwrap();
+        let filepath = dir.path().join("wiliam");
+        let filename = filepath.to_str().unwrap();
+        let item = Entry::new(filename.to_string(), data.clone())
+            .await
+            .unwrap();
+        assert!(
+            Duration::from_secs(1) > item.elapsed(),
+            "last_used should have been now."
+        );
+        let output = item.data();
+        assert_eq!(
+            data.list(["database"].to_vec()).unwrap(),
+            output.list(["database"].to_vec()).unwrap()
+        );
+        assert!(filepath.is_file(), "Should have created the entry file.");
+        let content = read(&filepath).await.unwrap();
+        assert_eq!(content, data.to_bytes());
+    }
+
+    #[async_std::test]
+    async fn create_errors_on_bad_files() -> Result<(), DBError> {
+        let dir = tempdir().unwrap();
+        let data = DataType::new("store").unwrap();
+        let filepath = dir.path().join("bad").join("path");
+        let filename = filepath.to_str().unwrap();
+        match Entry::new(filename.to_string(), data).await {
+            Ok(_) => Err(DBError::new("bad file names should raise an error")),
+            Err(err) => match err.code {
+                ErrorCode::EntryWriteFailure(_) => {
+                    assert!(err.source().is_some(), "Must include the source error.");
+                    assert!(err
+                        .source()
+                        .unwrap()
+                        .to_string()
+                        .contains("could not write to file"));
+                    Ok(())
+                }
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+
+    #[async_std::test]
+    async fn create_does_not_over_writes() -> Result<(), DBError> {
+        let dir = tempdir().unwrap();
+        let id = "wicked";
+        let file = dir.path().join(id);
+        let filename = file.to_str().unwrap();
+        write(&file, b"previous").await.unwrap();
+        let data = DataType::new("store").unwrap();
+        match Entry::new(filename.to_string(), data).await {
+            Ok(_) => {
+                return Err(DBError::new(
+                    "Should produce an error for an existing Entry",
+                ))
+            }
+            Err(err) => match err.code {
+                ErrorCode::EntryExists(_) => Ok(()),
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+
+    #[async_std::test]
+    async fn get_updates_last_used() {
+        let dir = tempdir().unwrap();
+        let data = DataType::new("store").unwrap();
+        let filepath = dir.path().join("holder");
+        let filename = filepath.to_str().unwrap();
+        let item = Entry::new(filename.to_string(), data).await.unwrap();
+        item.last_used
+            .set(Instant::now() - Duration::from_secs(300));
+        item.data();
+        assert!(
+            Duration::from_secs(1) > item.elapsed(),
+            "last_used should have been reset."
+        );
+    }
+
+    #[async_std::test]
+    async fn update_entry() {
+        let dir = tempdir().unwrap();
+        let mut data = DataType::new("store").unwrap();
+        let filepath = dir.path().join("changing");
+        let filename = filepath.to_str().unwrap();
+        let mut item = Entry::new(filename.to_string(), data.clone())
+            .await
+            .unwrap();
+        item.last_used
+            .set(Instant::now() - Duration::from_secs(500));
+        data.add("database", "new", "stuff").unwrap();
+        item.update(data.clone()).await.unwrap();
+        assert!(
+            Duration::from_secs(1) > item.elapsed(),
+            "last_used should have been reset."
+        );
+        let output = item.data();
+        assert_eq!(
+            data.list(["database"].to_vec()).unwrap(),
+            output.list(["database"].to_vec()).unwrap()
+        );
+        let content = read(&filepath).await.unwrap();
+        assert_eq!(content, data.to_bytes());
+    }
+
+    #[async_std::test]
+    async fn update_write_errors() -> Result<(), DBError> {
+        let dir = tempdir().unwrap();
+        let data = DataType::new("store").unwrap();
+        let filepath = dir.path().join("changing");
+        let filename = filepath.to_str().unwrap();
+        let mut item = Entry::new(filename.to_string(), data.clone())
+            .await
+            .unwrap();
+        drop(dir);
+        match item.update(data).await {
+            Ok(_) => Err(DBError::new("file writes should return an error")),
+            Err(err) => match err.code {
+                ErrorCode::EntryWriteFailure(_) => {
+                    assert!(err.source().is_some(), "Must include the source error.");
+                    assert!(err
+                        .source()
+                        .unwrap()
+                        .to_string()
+                        .contains("could not write to file"));
+                    Ok(())
+                }
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+
+    #[async_std::test]
+    async fn retrieve() {
+        let dir = tempdir().unwrap();
+        let mut data = DataType::new("store").unwrap();
+        data.add("database", "something_old", "3.14159").unwrap();
+        let filepath = dir.path().join("existing");
+        let filename = filepath.to_str().unwrap();
+        let item = Entry::new(filename.to_string(), data.clone())
+            .await
+            .unwrap();
+        let output = Entry::get(filename).await.unwrap();
+        assert_eq!(
+            output.data().list(["database"].to_vec()).unwrap(),
+            data.list(["database"].to_vec()).unwrap()
+        );
+        assert_eq!(output.filename.to_str().unwrap(), filename);
+        assert!(
+            Duration::from_secs(1) > item.elapsed(),
+            "last_used should have been reset."
+        );
+    }
+
+    #[async_std::test]
+    async fn retrieve_file_missing() -> Result<(), DBError> {
+        let dir = tempdir().unwrap();
+        let filepath = dir.path().join("justnotthere");
+        let filename = filepath.to_str().unwrap();
+        match Entry::get(filename).await {
+            Ok(_) => Err(DBError::new("should have returned an error")),
+            Err(err) => match err.code {
+                ErrorCode::EntryReadFailure(_) => {
+                    assert!(err.source().is_some(), "Error should have a source.");
+                    assert!(
+                        err.source()
+                            .unwrap()
+                            .to_string()
+                            .contains("could not read file"),
+                        "Source Error Message: {}",
+                        err.source().unwrap().to_string()
+                    );
+                    Ok(())
+                }
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+
+    #[async_std::test]
+    async fn retrieve_corrupt_file() -> Result<(), DBError> {
+        let dir = tempdir().unwrap();
+        let filepath = dir.path().join("garbage");
+        let filename = filepath.to_str().unwrap();
+        write(&filepath, b"jhsdfghlsdf").await.unwrap();
+        match Entry::get(filename).await {
+            Ok(_) => Err(DBError::new("should have returned an error")),
+            Err(err) => match err.code {
+                ErrorCode::EntryReadFailure(_) => {
+                    assert!(err.source().is_some(), "Error should have a source.");
+                    assert!(
+                        err.source().unwrap().to_string().contains("corrupt file"),
+                        "Source Error Message: {}",
+                        err.source().unwrap().to_string()
+                    );
+                    Ok(())
+                }
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+
+    #[async_std::test]
+    async fn delete() {
+        let dir = tempdir().unwrap();
+        let filepath = dir.path().join("byebye");
+        let filename = filepath.to_str().unwrap();
+        let data = DataType::new("store").unwrap();
+        let item = Entry::new(filename.to_string(), data.clone())
+            .await
+            .unwrap();
+        item.remove().await.unwrap();
+        assert!(!filepath.exists(), "Entry file should be removed.");
+    }
+
+    #[async_std::test]
+    async fn delete_bad_file() -> Result<(), DBError> {
+        let dir = tempdir().unwrap();
+        let filepath = dir.path().join("itsnotthere");
+        let filename = filepath.to_str().unwrap();
+        let data = DataType::new("store").unwrap();
+        let item = Entry::new(filename.to_string(), data.clone())
+            .await
+            .unwrap();
+        remove_file(filename).await.unwrap();
+        match item.remove().await {
+            Ok(_) => Err(DBError::new("should have produced an error")),
+            Err(err) => match err.code {
+                ErrorCode::EntryDeleteFailure(_) => {
+                    assert!(err.source().is_some(), "Error should have a source.");
+                    assert!(
+                        err.source()
+                            .unwrap()
+                            .to_string()
+                            .contains("could not remove file"),
+                        "Source Error Message: {}",
+                        err.source().unwrap().to_string()
+                    );
+                    Ok(())
+                }
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+}

src/morethantext/error.rs

@@ -1,95 +1,93 @@
-use async_std::path::PathBuf;
 use std::{error::Error, fmt};
 
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub enum ErrorCode {
+    // General
     Undefined(String),
-    // Read Write Errors
-    CorruptFile,
-    // Data Type Errors
-    DataTypeIncorrect(String),
-    // Entry Errors
-    EntryExists(PathBuf),
-    EntryWriteFailure(PathBuf),
-    EntryReadFailure(PathBuf),
-    EntryDeleteFailure(PathBuf),
     // Cache
-    CacheReadWrite,
+    IDNotFound(String),
+    // Store
+    DuplicateDatabase(String),
+    // Database
+    DuplicateTable(String),
 }
 
 impl fmt::Display for ErrorCode {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             ErrorCode::Undefined(msg) => write!(f, "{}", msg),
-            ErrorCode::DataTypeIncorrect(dtype) => write!(f, "data type '{}' is not valid", dtype),
-            ErrorCode::CorruptFile => write!(f, "corrupt file"),
-            ErrorCode::EntryExists(path) => write!(
-                f,
-                "entry '{}' already exists",
-                path.file_name().unwrap().to_str().unwrap()
-            ),
-            ErrorCode::EntryWriteFailure(path) => write!(
-                f,
-                "entry '{}' write failure",
-                path.file_name().unwrap().to_str().unwrap()
-            ),
-            ErrorCode::EntryReadFailure(path) => write!(
-                f,
-                "entry '{}' read failure",
-                path.file_name().unwrap().to_str().unwrap()
-            ),
-            ErrorCode::EntryDeleteFailure(path) => write!(
-                f,
-                "entry '{}' delete failure",
-                path.file_name().unwrap().to_str().unwrap()
-            ),
-            ErrorCode::CacheReadWrite => write!(f, "cache read write"),
+            ErrorCode::IDNotFound(id) => write!(f, "ID '{}' not found", id),
+            ErrorCode::DuplicateDatabase(name) => write!(f, "database '{}' already exists", name),
+            ErrorCode::DuplicateTable(name) => write!(f, "table '{}' already exists", name),
         }
     }
 }
 
-#[derive(Debug)]
-pub struct DBError {
-    pub code: ErrorCode,
-    src: Option<Box<dyn Error + 'static>>,
+mod errorcodes {
+    use super::*;
+
+    const ITEMS: [&str; 2] = ["one", "two"];
+
+    #[test]
+    fn undefined_display() {
+        for item in ITEMS {
+            let err = ErrorCode::Undefined(item.to_string());
+            assert_eq!(err.to_string(), item);
+        }
+    }
+
+    #[test]
+    fn cache_missing() {
+        for item in ITEMS {
+            let err = ErrorCode::IDNotFound(item.to_string());
+            assert_eq!(err.to_string(), format!("ID '{}' not found", item));
+        }
+    }
+
+    #[test]
+    fn duplicate_database() {
+        for item in ITEMS {
+            let err = ErrorCode::DuplicateDatabase(item.to_string());
+            assert_eq!(
+                err.to_string(),
+                format!("database '{}' already exists", item)
+            );
+        }
+    }
+
+    #[test]
+    fn duplicate_table() {
+        for item in ITEMS {
+            let err = ErrorCode::DuplicateTable(item.to_string());
+            assert_eq!(err.to_string(), format!("table '{}' already exists", item));
+        }
+    }
 }
 
-impl DBError {
+#[derive(Clone, Debug)]
+pub struct MTTError {
+    pub code: ErrorCode,
+}
+
+impl MTTError {
     pub fn new<S>(msg: S) -> Self
     where
         S: Into<String>,
     {
+        let text = msg.into();
         Self {
-            code: ErrorCode::Undefined(msg.into()),
-            src: None,
+            code: ErrorCode::Undefined(text),
         }
     }
 
     pub fn from_code(code: ErrorCode) -> Self {
-        Self {
-            code: code,
-            src: None,
-        }
-    }
-
-    pub fn add_source<E>(&mut self, src: E)
-    where
-        E: Error + 'static,
-    {
-        self.src = Some(Box::new(src));
+        Self { code: code }
     }
 }
 
-impl Error for DBError {
-    fn source(&self) -> Option<&(dyn Error + 'static)> {
-        match &self.src {
-            Some(err) => Some(err.as_ref()),
-            None => None,
-        }
-    }
-}
+impl Error for MTTError {}
 
-impl fmt::Display for DBError {
+impl fmt::Display for MTTError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{}", self.code)
     }
@@ -100,160 +98,38 @@ mod errors {
     use super::*;
 
     #[test]
-    fn with_str() {
-        let msg = "something happened";
-        let err = DBError::new(msg);
-        assert!(
-            err.to_string() == msg,
-            "Got: {} -- Want: {}",
-            err.to_string(),
-            msg
-        );
-        assert!(
-            err.source().is_none(),
-            "Error should initialize with no source."
-        );
+    fn create_with_str() {
+        let msgs = ["one", "two"];
+        for msg in msgs {
+            let err = MTTError::new(msg);
+            assert_eq!(err.to_string(), msg);
+        }
     }
 
     #[test]
-    fn with_string() {
-        let msg = "it went boom".to_string();
-        let err = DBError::new(msg.clone());
-        assert!(
-            err.to_string() == msg,
-            "Got: {} -- Want: {}",
-            err.to_string(),
-            msg
-        );
-        assert!(
-            err.source().is_none(),
-            "Error should initialize with no source."
-        );
-    }
-
-    #[test]
-    fn using_error_code() {
-        let msg = "utter failure";
-        let code = ErrorCode::Undefined(msg.to_string());
-        let err = DBError::from_code(code);
+    fn create_with_string() {
+        let msg = "three";
+        let err = MTTError::new(msg.to_string());
         assert_eq!(err.to_string(), msg);
-        assert!(err.source().is_none(), "Should be no source");
     }
 
     #[test]
-    fn with_source() {
-        let msg = "but this caused the problem";
-        let mut par = DBError::new("parent error");
-        let src = DBError::new(msg);
-        par.add_source(src);
-        let output = par.source();
-        assert!(output.is_some(), "Should return source.");
-        let source = output.unwrap();
-        assert!(source.to_string() == msg);
-    }
-}
-
-#[cfg(test)]
-mod codes {
-    use super::*;
-    use async_std::path::PathBuf;
-
-    const items: [&str; 2] = ["first", "second"];
-
-    fn create_path_buffer() -> Vec<PathBuf> {
-        let mut output = Vec::new();
-        for item in items {
-            let mut path = PathBuf::new();
-            path.push("thepath");
-            path.push(item);
-            output.push(path);
-        }
-        output
-    }
-
-    #[test]
-    fn undefined_display() {
-        for item in items {
-            let err = ErrorCode::Undefined(item.to_string());
-            assert_eq!(err.to_string(), item);
-        }
-    }
-
-    #[test]
-    fn incorrect_data_type() {
-        for item in items {
-            let err = ErrorCode::DataTypeIncorrect(item.to_string());
-            assert_eq!(
-                err.to_string(),
-                format!("data type '{}' is not valid", item)
-            );
-        }
-    }
-
-    #[test]
-    fn corrupt_file() {
-        assert_eq!(ErrorCode::CorruptFile.to_string(), "corrupt file");
-    }
-
-    #[test]
-    fn entry_exists() {
-        for path in create_path_buffer() {
-            let err = ErrorCode::EntryExists(path.clone());
-            assert_eq!(
-                err.to_string(),
-                format!(
-                    "entry '{}' already exists",
-                    path.file_name().unwrap().to_str().unwrap()
-                )
-            );
-        }
-    }
-
-    #[test]
-    fn entry_write_failure() {
-        for path in create_path_buffer() {
-            let err = ErrorCode::EntryWriteFailure(path.clone());
-            assert_eq!(
-                err.to_string(),
-                format!(
-                    "entry '{}' write failure",
-                    path.file_name().unwrap().to_str().unwrap()
-                )
-            );
-        }
-    }
-
-    #[test]
-    fn entry_read_failure() {
-        for path in create_path_buffer() {
-            let err = ErrorCode::EntryReadFailure(path.clone());
-            assert_eq!(
-                err.to_string(),
-                format!(
-                    "entry '{}' read failure",
-                    path.file_name().unwrap().to_str().unwrap()
-                )
-            );
-        }
-    }
-
-    #[test]
-    fn entry_delete_failure() {
-        for path in create_path_buffer() {
-            let err = ErrorCode::EntryDeleteFailure(path.clone());
-            assert_eq!(
-                err.to_string(),
-                format!(
-                    "entry '{}' delete failure",
-                    path.file_name().unwrap().to_str().unwrap()
-                )
-            );
-        }
-    }
-
-    #[test]
-    fn cache_read_write_failure() {
-        let err = ErrorCode::CacheReadWrite;
-        assert_eq!(err.to_string(), "cache read write");
+    fn create_from_code() {
+        let code = ErrorCode::Undefined("oops".to_string());
+        let err = MTTError::from_code(code);
+        match err.code {
+            ErrorCode::Undefined(_) => (),
+            _ => assert!(false, "{:?} is not undefined", err.code),
+        }
+    }
+
+    #[test]
+    fn create_missing_id_from_code() {
+        let code = ErrorCode::IDNotFound("123".to_string());
+        let err = MTTError::from_code(code);
+        match err.code {
+            ErrorCode::IDNotFound(_) => (),
+            _ => assert!(false, "{:?} is not undefined", err.code),
+        }
     }
 }

src/morethantext/fieldtype/mod.rs

@@ -0,0 +1,89 @@
+mod static_string;
+
+use crate::morethantext::error::MTTError;
+use static_string::StaticString;
+use std::fmt;
+
+pub enum FieldType {
+    StaticString(StaticString),
+}
+
+impl FieldType {
+    fn new(ftype: &str, data: &str) -> Result<Self, MTTError> {
+        let field = match ftype {
+            "StaticString" => StaticString::new(data),
+            _ => Err(MTTError::new(format!(
+                "field type {} does not exist",
+                ftype
+            ))),
+        };
+        match field {
+            Ok(fld) => Ok(fld.into()),
+            Err(e) => Err(e),
+        }
+    }
+}
+
+impl fmt::Display for FieldType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            FieldType::StaticString(data) => write!(f, "{}", data),
+        }
+    }
+}
+
+impl From<StaticString> for FieldType {
+    fn from(data: StaticString) -> Self {
+        FieldType::StaticString(data)
+    }
+}
+
+#[cfg(test)]
+mod converstion {
+    use super::*;
+
+    #[test]
+    fn from_static_string() {
+        let data = "a static string";
+        let field = StaticString::new(data).unwrap();
+        let ftype: FieldType = field.into();
+        assert!(
+            ftype.to_string() == data,
+            "\n\nGot:  {}\nWant: {}",
+            ftype.to_string(),
+            data
+        );
+    }
+
+    #[test]
+    fn bad_field_type() -> Result<(), String> {
+        let field_type = "dragon";
+        let err_msg = format!("field type {} does not exist", field_type);
+        match FieldType::new(field_type, "marmalade") {
+            Ok(_) => Err("Should have returned an error.".to_string()),
+            Err(err) => {
+                if err.to_string() == err_msg {
+                    Ok(())
+                } else {
+                    Err(format!(
+                        "Error message is incorrect: Got: '{}' Want: '{}'",
+                        err.to_string(),
+                        err_msg
+                    ))
+                }
+            }
+        }
+    }
+
+    #[test]
+    fn new_static_string() {
+        let data = "This is a test.";
+        let field = FieldType::new("StaticString", data).unwrap();
+        assert!(
+            field.to_string() == data,
+            "\n\nGot:  {}\nWant: {}\n\n",
+            field.to_string(),
+            data
+        );
+    }
+}

src/morethantext/fieldtype/static_string.rs

@@ -0,0 +1,50 @@
+use crate::morethantext::error::MTTError;
+use std::fmt;
+
+pub struct StaticString {
+    data: String,
+}
+
+impl StaticString {
+    pub fn new<S>(name: S) -> Result<Self, MTTError>
+    where
+        S: Into<String>,
+    {
+        Ok(Self { data: name.into() })
+    }
+}
+
+impl fmt::Display for StaticString {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", &self.data)
+    }
+}
+
+#[cfg(test)]
+mod creation {
+    use super::*;
+
+    #[test]
+    fn new_accepts_str() {
+        let data = "some data";
+        let field = StaticString::new(data).unwrap();
+        assert!(
+            field.to_string() == data,
+            "\n\nGot:  {}\nWant: {}",
+            field.to_string(),
+            data
+        );
+    }
+
+    #[test]
+    fn new_accepts_string() {
+        let data = "actual string";
+        let field = StaticString::new(data.to_string()).unwrap();
+        assert!(
+            field.to_string() == data,
+            "\n\nGot:  {}\nWant: {}",
+            field.to_string(),
+            data
+        );
+    }
+}

src/morethantext/graphql.rs

@@ -0,0 +1,179 @@
+use async_graphql::{Context, EmptySubscription, Error, Object, Result, Schema};
+use async_std::sync::RwLock;
+use serde_json;
+
+mod database;
+
+#[derive(Clone)]
+struct Table {
+    name: String,
+}
+
+impl Table {
+    async fn new(name: String) -> Self {
+        Self { name: name }
+    }
+}
+
+#[Object]
+impl Table {
+    async fn name(&self) -> String {
+        self.name.to_string()
+    }
+
+    async fn describe(&self) -> Vec<u64> {
+        Vec::new()
+    }
+}
+
+struct Query;
+
+#[Object]
+impl Query {
+    async fn table(&self, ctx: &Context<'_>, name: String) -> Result<Option<Table>> {
+        let tbls = ctx
+            .data::<RwLock<Vec<Table>>>()
+            .unwrap()
+            .read()
+            .await
+            .to_vec();
+        match tbls.binary_search_by(|t| t.name.cmp(&name)) {
+            Ok(idx) => Ok(Some(tbls[idx].clone())),
+            Err(_) => Ok(None),
+        }
+    }
+
+    async fn tables(&self, ctx: &Context<'_>) -> Vec<Table> {
+        ctx.data::<RwLock<Vec<Table>>>()
+            .unwrap()
+            .read()
+            .await
+            .to_vec()
+    }
+}
+
+struct Mutation;
+
+#[Object]
+impl Mutation {
+    async fn create_table(&self, ctx: &Context<'_>, name: String) -> Result<Option<Table>> {
+        let mut tables = ctx.data::<RwLock<Vec<Table>>>().unwrap().write().await;
+        match tables.binary_search_by(|t| t.name.cmp(&name)) {
+            Ok(_) => Err(Error::new(format!("Table {} already exists.", &name))),
+            Err(_) => {
+                let output = Table::new(name).await;
+                tables.push(output.clone());
+                tables.sort_by_key(|k| k.name.clone());
+                Ok(Some(output))
+            }
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct MoreThanText {
+    schema: Schema<Query, Mutation, EmptySubscription>,
+}
+
+impl MoreThanText {
+    pub fn new() -> Self {
+        let tables: Vec<Table> = Vec::new();
+        Self {
+            schema: Schema::build(Query, Mutation, EmptySubscription)
+                .data(RwLock::new(tables))
+                .finish(),
+        }
+    }
+
+    pub async fn execute(&self, qry: &str) -> String {
+        let res = self.schema.execute(qry).await;
+        serde_json::to_string(&res).unwrap()
+    }
+}
+
+#[cfg(test)]
+mod support {
+    use super::*;
+
+    pub fn compare(db: &MoreThanText, output: &str, expected: &str) {
+        assert!(
+            output == expected,
+            "\n\n{}\nGot:  {}\nWant: {}\n\n",
+            db.schema.sdl(),
+            output,
+            expected
+        );
+    }
+}
+
+#[cfg(test)]
+mod queries {
+    use super::*;
+
+    #[async_std::test]
+    async fn list_table() {
+        let db = MoreThanText::new();
+        db.execute(r#"mutation {createTable(name: "wilma"){name}}"#)
+            .await;
+        db.execute(r#"mutation {createTable(name: "betty"){name}}"#)
+            .await;
+        let output = db.execute(r#"{table(name: "wilma"){name}}"#).await;
+        let expected = r#"{"data":{"table":{"name":"wilma"}}}"#;
+        support::compare(&db, &output, &expected);
+    }
+
+    #[async_std::test]
+    async fn list_no_table() {
+        let db = MoreThanText::new();
+        let output = db.execute(r#"{table(name: "slade"){name}}"#).await;
+        let expected = r#"{"data":{"table":null}}"#;
+        support::compare(&db, &output, &expected);
+    }
+
+    #[async_std::test]
+    async fn list_tables() {
+        let db = MoreThanText::new();
+        db.execute(r#"mutation {createTable(name: "fred"){name}}"#)
+            .await;
+        db.execute(r#"mutation {createTable(name: "barney"){name}}"#)
+            .await;
+        let output = db.execute(r#"{tables{name}}"#).await;
+        let expected = r#"{"data":{"tables":[{"name":"barney"},{"name":"fred"}]}}"#;
+        support::compare(&db, &output, &expected);
+    }
+
+    #[async_std::test]
+    async fn empty_table_description() {
+        let db = MoreThanText::new();
+        let output = db
+            .execute(r#"mutation {createTable(name: "pebbles"){name describe}}"#)
+            .await;
+        let expected = r#"{"data":{"createTable":{"name":"pebbles","describe":[]}}}"#;
+        support::compare(&db, &output, &expected);
+    }
+}
+
+#[cfg(test)]
+mod mutations {
+    use super::*;
+
+    #[async_std::test]
+    async fn add_table() {
+        let db = MoreThanText::new();
+        let output = db
+            .execute(r#"mutation {createTable(name: "william"){name}}"#)
+            .await;
+        let expected = r#"{"data":{"createTable":{"name":"william"}}}"#;
+        support::compare(&db, &output, &expected);
+    }
+
+    #[async_std::test]
+    async fn cannot_add_duplicate_table() {
+        let db = MoreThanText::new();
+        let qry = r#"mutation {createTable(name: "gadzoo"){name}}"#;
+        db.execute(&qry).await;
+        let output = db.execute(qry).await;
+        let expected = r#"{"data":null,"errors":[{"message":"Table gadzoo already exists.","locations":[{"line":1,"column":11}],"path":["createTable"]}]}"#;
+        support::compare(&db, &output, &expected);
+    }
+}

src/morethantext/mod-2.rs

@@ -0,0 +1,402 @@
+mod database;
+mod entry;
+mod error;
+mod store;
+
+use async_std::path::PathBuf;
+use database::Database;
+use entry::Entry;
+use error::{DBError, ErrorCode};
+use rand::{distributions::Alphanumeric, thread_rng, Rng};
+use std::{slice, str};
+use store::Store;
+
+const ENTRY: &str = "EntryPoint";
+
+trait ID {
+    fn next(&self) -> String;
+}
+
+trait FileData<F> {
+    fn to_bytes(&self) -> Vec<u8>;
+    fn from_bytes(data: &mut slice::Iter<u8>) -> Result<F, DBError>;
+}
+
+trait SessionData {
+    fn add(&mut self, key: &str, value: &str, data: &str) -> Result<Vec<String>, DBError>;
+    fn eq(&self, key: &str, value: &str) -> Result<Vec<String>, DBError>;
+    fn list(&self, keys: Vec<&str>) -> Result<Vec<String>, DBError>;
+}
+
+#[derive(Clone)]
+pub enum DataType {
+    DBMap(Store),
+    TableMap(Database),
+}
+
+impl DataType {
+    fn new(data_type: &str) -> Result<Self, DBError> {
+        match data_type {
+            "store" => Ok(DataType::DBMap(Store::new())),
+            "database" => Ok(DataType::TableMap(Database::new())),
+            _ => Err(DBError::from_code(ErrorCode::DataTypeIncorrect(
+                data_type.to_string(),
+            ))),
+        }
+    }
+}
+
+impl SessionData for DataType {
+    fn add(&mut self, key: &str, value: &str, data: &str) -> Result<Vec<String>, DBError> {
+        match self {
+            DataType::DBMap(dbs) => dbs.add(key, value, data),
+            DataType::TableMap(_) => todo!(),
+        }
+    }
+
+    fn eq(&self, key: &str, value: &str) -> Result<Vec<String>, DBError> {
+        match self {
+            DataType::DBMap(dbs) => dbs.eq(key, value),
+            DataType::TableMap(_) => todo!(),
+        }
+    }
+
+    fn list(&self, keys: Vec<&str>) -> Result<Vec<String>, DBError> {
+        match self {
+            DataType::DBMap(dbs) => dbs.list(keys),
+            DataType::TableMap(_) => todo!(),
+        }
+    }
+}
+
+impl FileData<Self> for DataType {
+    fn to_bytes(&self) -> Vec<u8> {
+        let mut output = Vec::new();
+        match self {
+            DataType::DBMap(_) => output.append(&mut "DBMap".as_bytes().to_vec()),
+            DataType::TableMap(_) => output.append(&mut "TableMap".as_bytes().to_vec()),
+        }
+        output.push(0);
+        match self {
+            DataType::DBMap(store) => output.append(&mut store.to_bytes()),
+            DataType::TableMap(_) => (),
+        }
+        output
+    }
+
+    fn from_bytes(data: &mut slice::Iter<u8>) -> Result<Self, DBError> {
+        let mut header: Vec<u8> = Vec::new();
+        loop {
+            let letter = match data.next() {
+                Some(a) => a.clone(),
+                None => 0,
+            };
+            if letter == 0 {
+                break;
+            } else {
+                header.push(letter);
+            }
+        }
+        let header = match str::from_utf8(&header) {
+            Ok(item) => item,
+            Err(_) => return Err(DBError::from_code(ErrorCode::CorruptFile)),
+        };
+        match header {
+            "DBMap" => match Store::from_bytes(data) {
+                Ok(store) => Ok(DataType::DBMap(store)),
+                Err(err) => Err(err),
+            },
+            "TableMap" => Ok(DataType::new("database").unwrap()),
+            _ => Err(DBError::from_code(ErrorCode::CorruptFile)),
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct MoreThanText {
+    next_id: &dyn Fn() -> String,
+    session: Vec<String>,
+}
+
+impl MoreThanText {
+    pub async fn new<P>(dir: P) -> Result<Self, DBError>
+    where
+        P: Into<PathBuf>,
+    {
+        let pathbuf = dir.into();
+        let entry = pathbuf.as_path().join(ENTRY);
+        match Entry::get(entry.clone()).await {
+            Ok(_) => (),
+            Err(_) => {
+                let store = DataType::new("store").unwrap();
+                match Entry::new(entry, store).await {
+                    Ok(_) => (),
+                    Err(err) => {
+                        let mut error = DBError::from_code(ErrorCode::CacheReadWrite);
+                        error.add_source(err);
+                        return Err(error);
+                    }
+                }
+            }
+        }
+        Ok(Self {
+            next_id: fn id() -> String { thread_rng().sample_iter(&Alphanumeric).take(64).collect() },
+            session: [ENTRY.to_string()].to_vec(),
+        })
+    }
+
+    fn set_session(&mut self, sess: Vec<String>) {
+        self.session = sess;
+    }
+
+    async fn new_entry(&self, _name: &str) -> Self {
+        self.clone()
+    }
+}
+
+#[cfg(test)]
+mod datatype {
+    use super::*;
+
+    #[test]
+    fn bad_data_type() -> Result<(), DBError> {
+        let dt = "bufcuss";
+        match DataType::new(dt) {
+            Ok(_) => Err(DBError::new("should have produced an error")),
+            Err(err) => match err.code {
+                ErrorCode::DataTypeIncorrect(value) => {
+                    assert_eq!(value, dt, "Incorrect input value");
+                    Ok(())
+                }
+                _ => {
+                    let mut error = DBError::new("incorrect error");
+                    error.add_source(err);
+                    Err(error)
+                }
+            },
+        }
+    }
+
+    #[test]
+    fn create_store() -> Result<(), DBError> {
+        match DataType::new("store") {
+            Ok(dt) => match dt {
+                DataType::DBMap(_) => Ok(()),
+                _ => Err(DBError::new("incorrect data type")),
+            },
+            Err(err) => Err(err),
+        }
+    }
+
+    #[test]
+    fn create_database() -> Result<(), DBError> {
+        match DataType::new("database") {
+            Ok(dt) => match dt {
+                DataType::TableMap(_) => Ok(()),
+                _ => Err(DBError::new("incorrect data type")),
+            },
+            Err(err) => Err(err),
+        }
+    }
+}
+
+#[cfg(test)]
+mod datatype_sesssion {
+    use super::*;
+
+    #[test]
+    fn update_storage() {
+        let mut dbs = DataType::new("store").unwrap();
+        let name = "new_database";
+        let id = "someid";
+        dbs.add("database", name, id).unwrap();
+        assert_eq!(dbs.eq("database", name).unwrap(), [id].to_vec());
+        assert_eq!(dbs.list(["database"].to_vec()).unwrap(), [name].to_vec());
+    }
+}
+
+#[cfg(test)]
+mod datatype_file {
+    use super::*;
+
+    #[test]
+    fn new_store_bytes() {
+        let dbs = DataType::new("store").unwrap();
+        let mut expected = "DBMap".as_bytes().to_vec();
+        expected.push(0);
+        assert_eq!(dbs.to_bytes(), expected);
+    }
+
+    #[test]
+    fn store_bytes_with_info() {
+        let name = "title";
+        let id = "king";
+        let mut store = Store::new();
+        let mut dt_store = DataType::new("store").unwrap();
+        let mut expected = dt_store.to_bytes();
+        store.add("database", name, id).unwrap();
+        expected.append(&mut store.to_bytes());
+        dt_store.add("database", name, id).unwrap();
+        assert_eq!(dt_store.to_bytes(), expected);
+    }
+
+    #[test]
+    fn read_empty_store() {
+        let dt_store = DataType::new("store").unwrap();
+        let data = dt_store.to_bytes();
+        let mut feed = data.iter();
+        let output = DataType::from_bytes(&mut feed).unwrap();
+        assert_eq!(
+            dt_store.list(["database"].to_vec()).unwrap(),
+            output.list(["database"].to_vec()).unwrap()
+        );
+    }
+
+    #[test]
+    fn read_store_info() {
+        let mut dt_store = DataType::new("store").unwrap();
+        dt_store.add("database", "raven", "beastboy").unwrap();
+        let data = dt_store.to_bytes();
+        let mut feed = data.iter();
+        let output = DataType::from_bytes(&mut feed).unwrap();
+        assert_eq!(
+            dt_store.list(["database"].to_vec()).unwrap(),
+            output.list(["database"].to_vec()).unwrap()
+        );
+    }
+
+    #[test]
+    fn new_database_bytes() {
+        let db = DataType::new("database").unwrap();
+        let mut expected = "TableMap".as_bytes().to_vec();
+        expected.push(0);
+        assert_eq!(db.to_bytes(), expected);
+    }
+
+    #[test]
+    fn read_empty_database() {
+        let dt = DataType::new("database").unwrap();
+        let data = dt.to_bytes();
+        let mut feed = data.iter();
+        match DataType::from_bytes(&mut feed).unwrap() {
+            DataType::TableMap(_) => (),
+            _ => assert!(false, "Incorrect data type"),
+        }
+    }
+
+    #[test]
+    fn read_bad_header() -> Result<(), DBError> {
+        let data = "sdghsdl".as_bytes().to_vec();
+        let mut feed = data.iter();
+        match DataType::from_bytes(&mut feed) {
+            Ok(_) => Err(DBError::new("should have raised an error")),
+            Err(err) => match err.code {
+                ErrorCode::CorruptFile => Ok(()),
+                _ => Err(DBError::new("incorrect error")),
+            },
+        }
+    }
+
+    #[test]
+    fn read_bad_store() -> Result<(), DBError> {
+        let mut data = "DBMap".as_bytes().to_vec();
+        data.push(0);
+        data.append(&mut "sdfgs".as_bytes().to_vec());
+        let mut feed = data.iter();
+        match DataType::from_bytes(&mut feed) {
+            Ok(_) => Err(DBError::new("should have raised an error")),
+            Err(err) => match err.code {
+                ErrorCode::CorruptFile => Ok(()),
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+}
+
+#[cfg(test)]
+mod db {
+    use super::*;
+    use async_std::fs::write;
+    use std::error::Error;
+    use tempfile::tempdir;
+
+    #[async_std::test]
+    async fn create() {
+        let dir = tempdir().unwrap();
+        let mtt = MoreThanText::new(dir.path()).await.unwrap();
+        let epoint = dir.path().join(ENTRY);
+        assert!(
+            epoint.is_file(),
+            "{} did not get created.",
+            epoint.display()
+        );
+        let entry = Entry::get(epoint.to_str().unwrap()).await.unwrap();
+        assert_eq!(
+            entry.data().list(["database"].to_vec()).unwrap(),
+            Vec::<String>::new()
+        );
+        let sess = [ENTRY];
+        assert_eq!(mtt.session, sess);
+    }
+
+    #[async_std::test]
+    async fn entry_failure() -> Result<(), DBError> {
+        let dir = tempdir().unwrap();
+        let path = dir.path().join("bad").join("path");
+        match MoreThanText::new(path).await {
+            Ok(_) => Err(DBError::new("Should have produced an error.")),
+            Err(err) => match err.code {
+                ErrorCode::CacheReadWrite => {
+                    assert!(err.source().is_some(), "Error should have a source.");
+                    assert!(
+                        err.source().unwrap().to_string().contains("write failure"),
+                        "Source Error Message: {}",
+                        err.source().unwrap().to_string()
+                    );
+                    Ok(())
+                }
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+
+    #[async_std::test]
+    async fn existing_entry_point() -> Result<(), DBError> {
+        let dir = tempdir().unwrap();
+        let data = DataType::new("store").unwrap();
+        Entry::new(dir.path().join(ENTRY), data.clone())
+            .await
+            .unwrap();
+        match MoreThanText::new(dir.path()).await {
+            Ok(_) => Ok(()),
+            Err(err) => Err(err),
+        }
+    }
+
+    #[async_std::test]
+    async fn corrupt_enty_point() -> Result<(), DBError> {
+        let dir = tempdir().unwrap();
+        let file = dir.path().join(ENTRY);
+        write(file, b"Really bad data.").await.unwrap();
+        match MoreThanText::new(dir.path()).await {
+            Ok(_) => Err(DBError::new("should have errored")),
+            Err(_) => Ok(()),
+        }
+    }
+
+    #[async_std::test]
+    async fn set_session() {
+        let dir = tempdir().unwrap();
+        let mut mtt = MoreThanText::new(dir.path()).await.unwrap();
+        let sess = ["different".to_string()];
+        mtt.set_session(sess.to_vec());
+        assert_eq!(mtt.session, sess);
+    }
+
+    #[async_std::test]
+    async fn add_a_database() {
+        let dir = tempdir().unwrap();
+        let mtt = MoreThanText::new(dir.path()).await.unwrap();
+        mtt.new_entry("wilbur").await;
+    }
+}

src/morethantext/mod-3.rs

@@ -0,0 +1,640 @@
+use async_std::{
+    channel::{unbounded, Receiver, Sender},
+    path::PathBuf,
+    task::spawn,
+};
+use std::{collections::HashMap, error::Error, fmt};
+
+const ENTRY: &str = "EntryPoint";
+
+#[derive(Debug)]
+enum ErrorCode {
+    // General
+    Undefined(String),
+    // Cache
+    EntryNotFound(String),
+    InvalidCommitData,
+    // Store
+    DatabaseAlreadyExists(String),
+}
+
+impl fmt::Display for ErrorCode {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ErrorCode::Undefined(msg) => write!(f, "{}", msg),
+            ErrorCode::EntryNotFound(id) => write!(f, "entry '{}' was not found", id),
+            ErrorCode::InvalidCommitData => write!(f, "commit data was not a database store"),
+            ErrorCode::DatabaseAlreadyExists(name) => {
+                write!(f, "database '{}' already exists", name)
+            }
+        }
+    }
+}
+
+mod errorcodes {
+    use super::*;
+
+    const ITEMS: [&str; 2] = ["one", "two"];
+
+    #[test]
+    fn undefined_display() {
+        for item in ITEMS {
+            let err = ErrorCode::Undefined(item.to_string());
+            assert_eq!(err.to_string(), item);
+        }
+    }
+
+    #[test]
+    fn bad_entry() {
+        for item in ITEMS {
+            let err = ErrorCode::EntryNotFound(item.to_string());
+            assert_eq!(err.to_string(), format!("entry '{}' was not found", item));
+        }
+    }
+
+    #[test]
+    fn invalid_commit_data() {
+        let err = ErrorCode::InvalidCommitData;
+        assert_eq!(err.to_string(), "commit data was not a database store");
+    }
+
+    #[test]
+    fn database_already_exists() {
+        for item in ITEMS {
+            let err = ErrorCode::DatabaseAlreadyExists(item.to_string());
+            assert_eq!(
+                err.to_string(),
+                format!("database '{}' already exists", item)
+            );
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct MTTError {
+    code: ErrorCode,
+}
+
+impl MTTError {
+    fn new<S>(msg: S) -> Self
+    where
+        S: Into<String>,
+    {
+        let text = msg.into();
+        Self {
+            code: ErrorCode::Undefined(text),
+        }
+    }
+
+    fn from_code(code: ErrorCode) -> Self {
+        Self { code: code }
+    }
+}
+
+impl Error for MTTError {}
+
+impl fmt::Display for MTTError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.code)
+    }
+}
+
+#[cfg(test)]
+mod errors {
+    use super::*;
+
+    #[test]
+    fn create_with_str() {
+        let msgs = ["one", "two"];
+        for msg in msgs {
+            let err = MTTError::new(msg);
+            assert_eq!(err.to_string(), msg);
+        }
+    }
+
+    #[test]
+    fn create_with_string() {
+        let msg = "three";
+        let err = MTTError::new(msg.to_string());
+        assert_eq!(err.to_string(), msg);
+    }
+
+    #[test]
+    fn create_from_code() {
+        let code = ErrorCode::Undefined("oops".to_string());
+        let err = MTTError::from_code(code);
+        match err.code {
+            ErrorCode::Undefined(_) => (),
+            _ => assert!(false, "{:?} is not undefined", err.code),
+        }
+    }
+
+    #[test]
+    fn create_missing_entry() {
+        let code = ErrorCode::EntryNotFound("an_id".to_string());
+        let err = MTTError::from_code(code);
+        match err.code {
+            ErrorCode::EntryNotFound(_) => (),
+            _ => assert!(false, "{:?} is not undefined", err.code),
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+struct Storage<D> {
+    id: Option<String>,
+    data: Option<D>,
+    // delete: bool,
+}
+
+impl Storage<D> {
+    fn from_id<S>(id: S) -> Self
+    where
+        S: Into<String>,
+    {
+        Self {
+            id: Some(id.into()),
+            data: None,
+        }
+    }
+
+    fn from_datatype(dt: DataType) -> Self {
+        Self {
+            id: None,
+            data: Some(dt),
+        }
+    }
+}
+
+#[cfg(test)]
+mod storage {
+    use super::*;
+
+    #[test]
+    fn from_id_with_str() {
+        let ids = ["first", "second"];
+        for id in ids {
+            let output = Storage::from_id(id);
+            assert_eq!(output.id, Some(id.to_string()));
+            assert!(
+                output.data.is_none(),
+                "The storage data should have been Non."
+            );
+        }
+    }
+
+    #[test]
+    fn from_id_with_string() {
+        let id = "my_id".to_string();
+        let output = Storage::from_id(id.clone());
+        assert_eq!(output.id, Some(id));
+    }
+
+    #[test]
+    fn from_store() {
+        let output = Storage::from_datatype(DataType::new("store"));
+        assert!(output.id.is_none(), "id should be None.");
+        assert!(output.data.is_some(), "There should be data");
+        let result = output.data.unwrap();
+        match result {
+            DataType::DBMap(_) => (),
+            _ => assert!(false, "{:?} should have been DataType::DBMap.", result),
+        }
+    }
+
+    #[test]
+    fn from_database() {
+        let output = Storage::from_datatype(DataType::new("database"));
+        let result = output.data.unwrap();
+        match result {
+            DataType::TableMap(_) => (),
+            _ => assert!(false, "{:?} should have been DataType::TableMap.", result),
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+struct Store {
+    data: HashMap<String, Storage<Database>>,
+}
+
+impl Store {
+    fn new() -> Self {
+        Self {
+            data: HashMap::new(),
+        }
+    }
+
+    fn add_new<S>(&mut self, name: S) -> Result<(), MTTError>
+    where
+        S: Into<String>,
+    {
+        let dbname = name.into();
+        match self.get(&dbname) {
+            Some(_) => Err(MTTError::from_code(ErrorCode::DatabaseAlreadyExists(
+                dbname,
+            ))),
+            None => {
+                self.data
+                    .insert(dbname, Storage::from_datatype(DataType::new("database")));
+                Ok(())
+            }
+        }
+    }
+
+    fn get(&self, name: &str) -> Option<&Storage<Database>> {
+        self.data.get(name)
+    }
+}
+
+#[cfg(test)]
+mod stores {
+    use super::*;
+
+    #[test]
+    fn get_no_database() -> Result<(), MTTError> {
+        let store = Store::new();
+        match store.get("missing_name") {
+            Some(_) => Err(MTTError::new("should have returned None")),
+            None => Ok(()),
+        }
+    }
+
+    #[test]
+    fn add_database_str() {
+        let mut store = Store::new();
+        let names = ["first", "second"];
+        for name in names {
+            store.add_new(name).unwrap();
+            let output = store.get(name).unwrap();
+            assert!(output.data.is_some(), "There should be a data type.");
+            match output.data.clone().unwrap() {
+                DataType::TableMap(_) => (),
+                _ => assert!(
+                    false,
+                    "{:?} should have been DataType::TableMap.",
+                    output.data
+                ),
+            }
+            assert!(output.id.is_none(), "Should not have an id.");
+        }
+    }
+
+    #[test]
+    fn add_database_string() {
+        let mut store = Store::new();
+        let name = "third".to_string();
+        store.add_new(name.clone()).unwrap();
+        let output = store.get(&name).unwrap();
+        match output.data.clone().unwrap() {
+            DataType::TableMap(_) => (),
+            _ => assert!(
+                false,
+                "{:?} should have been DataType::TableMap.",
+                output.data
+            ),
+        }
+    }
+
+    #[test]
+    fn no_duplicate_database_names() -> Result<(), MTTError> {
+        let mut store = Store::new();
+        let name = "duplicate";
+        store.add_new(name).unwrap();
+        match store.add_new(name) {
+            Ok(_) => Err(MTTError::new("should have been an error")),
+            Err(err) => match err.code {
+                ErrorCode::DatabaseAlreadyExists(dbname) => {
+                    assert_eq!(dbname, name);
+                    Ok(())
+                }
+                _ => Err(MTTError::new(format!(
+                    "{:?} should have been DatabaseAlreadyExists.",
+                    err.code
+                ))),
+            },
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+struct Database;
+
+#[cfg(test)]
+mod databases {
+    use super::*;
+
+    #[test]
+    fn create() {
+        Database::new();
+    }
+}
+
+impl Database {
+    fn new() -> Self {
+        Self {}
+    }
+}
+
+#[derive(Clone, Debug)]
+enum DataType {
+    DBMap(Store),
+    TableMap(Database),
+}
+
+impl DataType {
+    fn new(dtype: &str) -> DataType {
+        match dtype {
+            "store" => Self::DBMap(Store::new()),
+            "database" => Self::TableMap(Database::new()),
+            _ => unreachable!(),
+        }
+    }
+}
+
+#[cfg(test)]
+mod datatypes {
+    use super::*;
+
+    #[test]
+    fn create_store() {
+        let dtype = DataType::new("store");
+        match dtype {
+            DataType::DBMap(_) => (),
+            _ => assert!(false, "{:?} is not incorrect data type", dtype),
+        }
+    }
+
+    #[test]
+    fn create_database() {
+        let dtype = DataType::new("database");
+        match dtype {
+            DataType::TableMap(_) => (),
+            _ => assert!(false, "{:?} is not incorrect data type", dtype),
+        }
+    }
+}
+
+#[derive(Debug)]
+enum FromCache {
+    Ok,
+    Data(HashMap<String, DataType>),
+    Error(MTTError),
+}
+
+struct CacheQuery {
+    ids: Vec<String>,
+    reply: Sender<FromCache>,
+}
+
+struct CacheCommit {
+    reply: Sender<FromCache>,
+    data: DataType,
+}
+
+impl CacheCommit {
+    fn new(data: DataType, channel: Sender<FromCache>) -> Result<Self, MTTError> {
+        match data {
+            DataType::DBMap(_) => (),
+            _ => return Err(MTTError::from_code(ErrorCode::InvalidCommitData)),
+        }
+        Ok(Self {
+            data: data,
+            reply: channel,
+        })
+    }
+}
+
+mod commits {
+    use super::*;
+
+    #[test]
+    fn create() -> Result<(), MTTError> {
+        let (s, _) = unbounded();
+        match CacheCommit::new(DataType::new("store"), s) {
+            Ok(output) => match output.data {
+                DataType::DBMap(_) => Ok(()),
+                _ => Err(MTTError::new(format!(
+                    "{:?} should have been DBMap",
+                    output.data
+                ))),
+            },
+            Err(err) => Err(err),
+        }
+    }
+
+    #[test]
+    fn bad_data_type() -> Result<(), MTTError> {
+        let (s, _) = unbounded();
+        match CacheCommit::new(DataType::new("database"), s) {
+            Ok(_) => Err(MTTError::new("CacheCommit::new did not return error")),
+            Err(err) => match err.code {
+                ErrorCode::InvalidCommitData => Ok(()),
+                _ => Err(MTTError::new(format!(
+                    "{:?} is not the correct error",
+                    err.code
+                ))),
+            },
+        }
+    }
+}
+
+enum ToCache {
+    Query(CacheQuery),
+    Commit(CacheCommit),
+}
+
+#[derive(Clone)]
+pub struct MoreThanText {
+    session: Vec<String>,
+    cache: Sender<Vec<String>>,
+}
+
+impl MoreThanText {
+    async fn new(cache: Sender<Vec<String>>) -> Result<Self, MTTError> {
+        Ok(Self {
+            session: [ENTRY.to_string()].to_vec(),
+            cache: cache,
+        })
+    }
+}
+
+#[cfg(test)]
+mod mtt {
+    use super::*;
+
+    #[async_std::test]
+    async fn create() {
+        let (s, _) = unbounded();
+        let mtt = MoreThanText::new(s).await.unwrap();
+        assert_eq!(mtt.session, [ENTRY]);
+    }
+}
+
+struct Cache;
+
+impl Cache {
+    async fn new<P>(_dir: P) -> Result<Self, MTTError>
+    where
+        P: Into<PathBuf>,
+    {
+        Ok(Self {})
+    }
+
+    async fn query(&self, qry: &Vec<String>) -> Result<HashMap<String, DataType>, MTTError> {
+        let mut output = HashMap::new();
+        for id in qry {
+            if id == ENTRY {
+                output.insert(ENTRY.to_string(), DataType::new("store"));
+            } else {
+                return Err(MTTError::from_code(ErrorCode::EntryNotFound(
+                    id.to_string(),
+                )));
+            }
+        }
+        Ok(output)
+    }
+
+    async fn commit(&self) -> Result<(), MTTError> {
+        Ok(())
+    }
+
+    async fn start(&self, listener: Receiver<ToCache>) {
+        loop {
+            match listener.recv().await.unwrap() {
+                ToCache::Query(qry) => match self.query(&qry.ids).await {
+                    Ok(data) => qry.reply.send(FromCache::Data(data)).await.unwrap(),
+                    Err(error) => qry.reply.send(FromCache::Error(error)).await.unwrap(),
+                },
+                ToCache::Commit(commit) => match self.commit().await {
+                    Ok(_) => commit.reply.send(FromCache::Ok).await.unwrap(),
+                    Err(error) => commit.reply.send(FromCache::Error(error)).await.unwrap(),
+                },
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod caches {
+    use super::*;
+    use tempfile::tempdir;
+
+    async fn start_cache<P>(dir: P) -> Sender<ToCache>
+    where
+        P: Into<PathBuf>,
+    {
+        let (s, r) = unbounded();
+        let datadir = dir.into();
+        spawn(async move {
+            let cache = Cache::new(datadir).await.unwrap();
+            cache.start(r).await;
+        });
+        s
+    }
+
+    async fn send_request(data: Vec<&str>, channel: Sender<ToCache>) -> FromCache {
+        let mut ids = Vec::new();
+        for id in data.iter() {
+            ids.push(id.to_string());
+        }
+        let (s, r) = unbounded();
+        let msg = ToCache::Query(CacheQuery { ids: ids, reply: s });
+        channel.send(msg).await.unwrap();
+        r.recv().await.unwrap()
+    }
+
+    #[async_std::test]
+    async fn create() {
+        let dir = tempdir().unwrap();
+        let s_cache = start_cache(dir.path()).await;
+        let result = send_request(vec![ENTRY], s_cache).await;
+        match result {
+            FromCache::Data(data) => match data.get(ENTRY) {
+                Some(output) => match output {
+                    DataType::DBMap(_) => (),
+                    _ => assert!(false, "{:?} is not a database store.", output),
+                },
+                None => assert!(false, "Should contain entry point."),
+            },
+            _ => assert!(false, "{:?} should have been a store.", result),
+        }
+    }
+
+    #[async_std::test]
+    async fn bad_entry() {
+        let dir = tempdir().unwrap();
+        let s_cache = start_cache(dir.path()).await;
+        let result = send_request(vec!["bad_id"], s_cache).await;
+        match result {
+            FromCache::Error(_) => (),
+            _ => assert!(false, "{:?} should have been an error.", result),
+        }
+    }
+
+    #[async_std::test]
+    async fn empty_commit() {
+        let dir = tempdir().unwrap();
+        let s_cache = start_cache(dir.path()).await;
+        let (s, r) = unbounded();
+        let msg = ToCache::Commit(CacheCommit::new(DataType::new("store"), s).unwrap());
+        s_cache.send(msg).await.unwrap();
+        let result = r.recv().await.unwrap();
+        match result {
+            FromCache::Ok => (),
+            _ => assert!(false, "{:?} should have been an Ok.", result),
+        }
+    }
+
+    #[async_std::test]
+    async fn get_store() {
+        let dir = tempdir().unwrap();
+        let cache = Cache::new(dir.path()).await.unwrap();
+        let output = cache.query(&[ENTRY.to_string()].to_vec()).await.unwrap();
+        let result = output.get(ENTRY).unwrap();
+        match result {
+            DataType::DBMap(_) => (),
+            _ => assert!(false, "{:?} should have been an Ok.", result),
+        }
+    }
+
+    #[async_std::test]
+    async fn bad_get() {
+        let dir = tempdir().unwrap();
+        let cache = Cache::new(dir.path()).await.unwrap();
+        let bad_id = "really_bad_id";
+        match cache.query(&[bad_id.to_string()].to_vec()).await {
+            Ok(_) => assert!(false, "Should have produced an error."),
+            Err(err) => match err.code {
+                ErrorCode::EntryNotFound(id) => assert_eq!(id, bad_id),
+                _ => assert!(false, "{:?} should have been EntryNotFound.", err.code),
+            },
+        }
+    }
+}
+
+pub async fn start_db<P>(_dir: P) -> Result<MoreThanText, MTTError>
+where
+    P: Into<PathBuf>,
+{
+    let (s, r) = unbounded();
+    spawn(async move {
+        loop {
+            r.recv().await.unwrap();
+        }
+    });
+    Ok(MoreThanText::new(s).await.unwrap())
+}
+
+#[cfg(test)]
+mod db_start_up {
+    use super::*;
+    use tempfile::tempdir;
+
+    #[async_std::test]
+    async fn initial_session() {
+        let dir = tempdir().unwrap();
+        let mtt = start_db(dir.path()).await.unwrap();
+        assert_eq!(mtt.session, [ENTRY]);
+    }
+}

src/morethantext/mod-old.rs

@@ -0,0 +1,823 @@
+mod cache;
+mod database;
+pub mod error;
+mod store;
+
+use async_std::{
+    fs::{create_dir, read, remove_file, write},
+    path::Path,
+    sync::{Arc, Mutex},
+    task::{sleep, spawn},
+};
+use database::Database;
+use error::{DBError, ErrorCode};
+use rand::{distributions::Alphanumeric, thread_rng, Rng};
+use std::{
+    collections::HashMap,
+    fmt, slice, str,
+    time::{Duration, Instant},
+};
+use store::Store;
+
+const DATA: &str = "data";
+const ENTRY: &str = "databases";
+
+trait FileData<F> {
+    fn to_bytes(&self) -> Vec<u8>;
+    fn from_bytes(data: &mut slice::Iter<u8>) -> Result<F, DBError>;
+}
+
+trait SessionData {
+    fn add(&mut self, key: &str, value: &str, data: &str) -> Result<Vec<String>, DBError>;
+    fn eq(&self, key: &str, value: &str) -> Result<Vec<String>, DBError>;
+    fn list(&self, keys: Vec<&str>) -> Result<Vec<String>, DBError>;
+}
+
+#[derive(Clone)]
+pub enum CacheType {
+    Raw(String),
+    DBMap(Store),
+    TableMap,
+}
+
+impl CacheType {
+    pub fn entry_type(&self) -> String {
+        match self {
+            CacheType::Raw(_) => "Raw".to_string(),
+            CacheType::DBMap(_) => "DBMap".to_string(),
+            CacheType::TableMap => "TableMap".to_string(),
+        }
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        let mut output = self.entry_type().into_bytes();
+        output.push(0);
+        match self {
+            CacheType::Raw(s) => output.append(&mut s.as_bytes().to_vec()),
+            CacheType::DBMap(_) => (),
+            CacheType::TableMap => (),
+        }
+        return output;
+    }
+
+    pub fn from_bytes(data: Vec<u8>) -> Result<CacheType, DBError> {
+        let mut data_iter = data.iter();
+        let mut letter: u8;
+        match data_iter.next() {
+            Some(item) => letter = *item,
+            None => return Err(DBError::new("empty file")),
+        }
+        let mut header: Vec<u8> = Vec::new();
+        while letter != 0 {
+            header.push(letter.clone());
+            match data_iter.next() {
+                Some(item) => letter = *item,
+                None => return Err(DBError::new("incomplete file")),
+            }
+        }
+        let header = str::from_utf8(&header).unwrap().to_string();
+        match header.as_str() {
+            "Raw" => {
+                let mut output: Vec<u8> = Vec::new();
+                for letter in data_iter {
+                    output.push(letter.clone());
+                }
+                Ok(CacheType::Raw(str::from_utf8(&output).unwrap().to_string()))
+            }
+            "DBMap" => Ok(CacheType::DBMap(Store::new())),
+            "TableMap" => Ok(CacheType::TableMap),
+            _ => Err(DBError::new("data corruption")),
+        }
+    }
+}
+
+impl fmt::Display for CacheType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            CacheType::Raw(s) => write!(f, "{}", s),
+            CacheType::DBMap(_) => todo!(),
+            CacheType::TableMap => todo!(),
+        }
+    }
+}
+
+#[derive(Clone)]
+struct CacheEntry {
+    data: CacheType,
+    last_used: Instant,
+}
+
+impl CacheEntry {
+    fn new(data: CacheType) -> Self {
+        Self {
+            data: data,
+            last_used: Instant::now(),
+        }
+    }
+
+    fn elapsed(&self) -> Duration {
+        self.last_used.elapsed()
+    }
+
+    fn touch(&mut self) {
+        self.last_used = Instant::now();
+    }
+
+    fn update(&mut self, data: CacheType) {
+        self.data = data;
+        self.touch();
+    }
+}
+
+impl fmt::Display for CacheEntry {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.data)
+    }
+}
+
+#[derive(Clone)]
+pub struct MoreThanText {
+    cache: Arc<Mutex<HashMap<String, CacheEntry>>>,
+    dir: String,
+    session: Vec<String>,
+}
+
+impl MoreThanText {
+    pub async fn new(dir: &str) -> Result<Self, DBError> {
+        let data_dir = Path::new(dir).join(DATA);
+        if !data_dir.is_dir().await {
+            match create_dir(&data_dir).await {
+                Ok(_) => (),
+                Err(err) => {
+                    let mut error = DBError::new("failed to create data directory");
+                    error.add_source(err);
+                    return Err(error);
+                }
+            }
+        }
+        let mut output = Self {
+            cache: Arc::new(Mutex::new(HashMap::new())),
+            dir: data_dir.to_str().unwrap().to_string(),
+            session: Vec::new(),
+        };
+        let entry_file = Path::new(dir).join(ENTRY);
+        let id: String;
+        if entry_file.is_file().await {
+            let holder = read(entry_file).await.unwrap();
+            id = str::from_utf8(&holder).unwrap().to_string();
+        } else {
+            id = output
+                .add_entry(CacheType::DBMap(Store::new()))
+                .await
+                .unwrap();
+            write(entry_file, id.as_bytes()).await.unwrap();
+        }
+        output.session.push(id);
+        let looper = output.cache.clone();
+        spawn(async move {
+            let hold_time = Duration::from_secs(300);
+            loop {
+                sleep(Duration::from_secs(1)).await;
+                let mut ids: Vec<String> = Vec::new();
+                let mut cache = looper.lock().await;
+                for (id, entry) in cache.iter() {
+                    if entry.elapsed() > hold_time {
+                        ids.push(id.to_string());
+                    }
+                }
+                for id in ids.iter() {
+                    cache.remove(id);
+                }
+            }
+        });
+        Ok(output)
+    }
+
+    fn filename(&self, id: &str) -> String {
+        let filename = Path::new(&self.dir).join(&id);
+        filename.into_os_string().into_string().unwrap()
+    }
+
+    fn new_id(&self) -> String {
+        thread_rng().sample_iter(&Alphanumeric).take(64).collect()
+    }
+
+    async fn add(&self, feature: &str, key: &str, value: &str) -> Self {
+        let mut ids: Vec<String> = Vec::new();
+        for id in self.session.clone().into_iter() {
+            let holder = self.get_entry(&id).await.unwrap();
+            //holder.add(feature, key, value);
+        }
+        let mut output = self.clone();
+        output.session.clear();
+        output.session.push(value.to_string());
+        output
+    }
+
+    async fn list(&self, feature: Vec<&str>) -> Result<Vec<String>, DBError> {
+        Ok(Vec::new())
+    }
+
+    async fn add_entry(&self, entry: CacheType) -> Result<String, DBError> {
+        let mut id: String = "".to_string();
+        let mut dup = true;
+        while dup {
+            id = thread_rng().sample_iter(&Alphanumeric).take(32).collect();
+            dup = Path::new(&self.dir).join(&id).as_path().exists().await;
+        }
+        match write(Path::new(&self.filename(&id)), entry.to_bytes()).await {
+            Ok(_) => (),
+            Err(err) => {
+                let mut error = DBError::new("data write");
+                error.add_source(err);
+                return Err(error);
+            }
+        };
+        let mut cache = self.cache.lock().await;
+        let data = CacheEntry::new(entry);
+        cache.insert(id.clone(), data);
+        Ok(id)
+    }
+
+    async fn get_entry(&self, id: &str) -> Result<CacheEntry, DBError> {
+        let mut cache = self.cache.lock().await;
+        match cache.get_mut(id) {
+            Some(entry) => {
+                entry.touch();
+                Ok(entry.clone())
+            }
+            None => match read(Path::new(&self.filename(id))).await {
+                Ok(content) => {
+                    let data = CacheEntry::new(CacheType::from_bytes(content).unwrap());
+                    cache.insert(id.to_string(), data.clone());
+                    Ok(data)
+                }
+                Err(_) => Err(DBError::new("cache entry not found")),
+            },
+        }
+    }
+
+    async fn update_entry(&self, id: &str, entry: CacheType) -> Result<(), DBError> {
+        match self.get_entry(id).await {
+            Ok(_) => (),
+            Err(err) => return Err(err),
+        }
+        match write(Path::new(&self.filename(id)), entry.to_bytes()).await {
+            Ok(_) => (),
+            Err(err) => {
+                let mut error = DBError::new("data write");
+                error.add_source(err);
+                return Err(error);
+            }
+        }
+        let mut cache = self.cache.lock().await;
+        let data = CacheEntry::new(entry);
+        cache.insert(id.to_string(), data);
+        Ok(())
+    }
+
+    async fn delete_entry(&self, id: &str) -> Result<(), DBError> {
+        let mut cache = self.cache.lock().await;
+        cache.remove(id);
+        match remove_file(Path::new(&self.filename(id))).await {
+            Ok(_) => Ok(()),
+            Err(err) => {
+                let mut error = DBError::new("data delete");
+                error.add_source(err);
+                Err(error)
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod setup {
+    use super::*;
+    use async_std::fs::remove_dir_all;
+    use tempfile::{tempdir, TempDir};
+
+    pub struct MTT {
+        pub db: MoreThanText,
+        pub dir: TempDir,
+    }
+
+    impl MTT {
+        pub async fn new() -> Self {
+            let dir = tempdir().unwrap();
+            let db = MoreThanText::new(dir.path().to_str().unwrap())
+                .await
+                .unwrap();
+            Self { db: db, dir: dir }
+        }
+
+        pub async fn create_io_error(&self) {
+            remove_dir_all(self.dir.path().join(DATA)).await.unwrap();
+        }
+    }
+}
+
+#[cfg(test)]
+mod init {
+    use super::*;
+    use std::error::Error;
+    use tempfile::tempdir;
+
+    #[async_std::test]
+    async fn create_data_dir() {
+        let dir = tempdir().unwrap();
+        MoreThanText::new(dir.path().to_str().unwrap())
+            .await
+            .unwrap();
+        let data_dir = dir.path().join(DATA);
+        assert!(data_dir.is_dir(), "Did not create the data directory.");
+        dir.close().unwrap();
+    }
+
+    #[async_std::test]
+    async fn existing_data_dir() {
+        let dir = tempdir().unwrap();
+        let data_dir = dir.path().join(DATA);
+        create_dir(data_dir).await.unwrap();
+        MoreThanText::new(dir.path().to_str().unwrap())
+            .await
+            .unwrap();
+        dir.close().unwrap();
+    }
+
+    #[async_std::test]
+    async fn bad_data_dir() {
+        let msg = "could not create directory";
+        match MoreThanText::new("kljsdgfhslkfrh").await {
+            Ok(_) => assert!(false, "This test should fail to create a data directory"),
+            Err(err) => {
+                assert_eq!(err.to_string(), "failed to create data directory");
+                assert!(err.source().is_some(), "Must include the source error.");
+                let err_msg = err.source().unwrap().to_string();
+                assert!(err_msg.contains(msg), "'{}' not in '{}'", msg, err_msg);
+            }
+        };
+    }
+
+    #[async_std::test]
+    async fn creates_entry_point() {
+        let dir = tempdir().unwrap();
+        let db = MoreThanText::new(dir.path().to_str().unwrap())
+            .await
+            .unwrap();
+        let entry = dir.path().join(ENTRY);
+        assert!(entry.is_file(), "Did not create entry point file.");
+        let data = read(entry).await.unwrap();
+        let id = str::from_utf8(&data).unwrap();
+        let cache = db.get_entry(&id).await.unwrap();
+        assert_eq!(cache.data.entry_type(), "DBMap");
+        assert_eq!(db.session, [id]);
+    }
+
+    #[async_std::test]
+    async fn use_existing_entry_point() {
+        let dir = tempdir().unwrap();
+        let db1 = MoreThanText::new(dir.path().to_str().unwrap())
+            .await
+            .unwrap();
+        let db2 = MoreThanText::new(dir.path().to_str().unwrap())
+            .await
+            .unwrap();
+        assert_eq!(db1.session, db2.session, "Did not read existing entry.");
+    }
+}
+
+#[cfg(test)]
+mod data {
+    use super::*;
+    use setup::MTT;
+
+    #[async_std::test]
+    async fn ids_are_random() {
+        let mtt = MTT::new().await;
+        let id1 = mtt.db.new_id();
+        let id2 = mtt.db.new_id();
+        assert_ne!(id1, id2, "Ids should be random");
+    }
+
+    #[async_std::test]
+    async fn add_database() {
+        let mtt = MTT::new().await;
+        let name = "fred";
+        let id = "*gsdfg";
+        let output = mtt.db.add("database", name, id).await;
+        assert_eq!(output.session, [id], "should update session info.");
+        /*
+        assert_eq!(
+            mtt.db.list(["database"].to_vec()).await.unwrap(),
+            [name],
+            "Should list the databases."
+        );
+        */
+    }
+}
+
+#[cfg(test)]
+mod cache_test {
+    use super::*;
+    use async_std::fs::read;
+    use setup::MTT;
+    use std::error::Error;
+
+    #[async_std::test]
+    async fn entry_ids_are_random() {
+        let mtt = MTT::new().await;
+        let data1 = CacheType::Raw("one".to_string());
+        let data2 = CacheType::Raw("two".to_string());
+        let id1 = mtt.db.add_entry(data1).await.unwrap();
+        let id2 = mtt.db.add_entry(data2).await.unwrap();
+        assert_ne!(id1, id2, "Ids should be unique.")
+    }
+
+    #[async_std::test]
+    async fn store_cache() {
+        let mtt = MTT::new().await;
+        let data = "something";
+        let expected = CacheType::Raw(data.to_string());
+        let id = mtt.db.add_entry(expected.clone()).await.unwrap();
+        let output = mtt.db.get_entry(&id).await.unwrap();
+        assert_eq!(output.to_string(), data);
+        let dfile = mtt.dir.path().join(DATA).join(&id);
+        assert!(dfile.is_file(), "Cache file should exist.");
+        let content = read(dfile).await.unwrap();
+        assert_eq!(content, expected.to_bytes());
+    }
+
+    #[async_std::test]
+    async fn get_entry_uodates_time() {
+        let mtt = MTT::new().await;
+        let id = "something";
+        let holder = CacheEntry {
+            data: CacheType::Raw("old".to_string()),
+            last_used: Instant::now() - Duration::from_secs(200),
+        };
+        let mut cache = mtt.db.cache.lock().await;
+        cache.insert(id.to_string(), holder);
+        drop(cache);
+        mtt.db.get_entry(&id).await.unwrap();
+        let cache = mtt.db.cache.lock().await;
+        let entry = cache.get(id).unwrap();
+        let held = entry.elapsed();
+        assert!(
+            Duration::from_secs(1) > held,
+            "Duration was {:?}, should have been close to 0s.",
+            held
+        );
+    }
+
+    #[async_std::test]
+    async fn retrieve_from_disk() {
+        let mtt = MTT::new().await;
+        let id = "someid";
+        let data = CacheType::Raw("stored".to_string());
+        write(mtt.dir.path().join(DATA).join(id), data.to_bytes())
+            .await
+            .unwrap();
+        let output = mtt.db.get_entry(id).await.unwrap();
+        assert_eq!(output.to_string(), data.to_string());
+        let cache = mtt.db.cache.lock().await;
+        let stored = cache.get(id);
+        assert!(stored.is_some(), "Did not store entry in the cache.");
+    }
+
+    #[async_std::test]
+    async fn store_bad_file() {
+        let mtt = MTT::new().await;
+        let msg = "could not write to file";
+        mtt.create_io_error().await;
+        match mtt.db.add_entry(CacheType::Raw("fail".to_string())).await {
+            Ok(_) => assert!(false, "This test should fail."),
+            Err(err) => {
+                assert_eq!(err.to_string(), "data write");
+                assert!(err.source().is_some(), "Must include the source error.");
+                let err_msg = err.source().unwrap().to_string();
+                assert!(err_msg.contains(msg), "'{}' not in '{}'", msg, err_msg);
+            }
+        }
+    }
+
+    #[async_std::test]
+    async fn retrieve_bad_id() {
+        let mtt = MTT::new().await;
+        match mtt.db.get_entry(&"Not Valid").await {
+            Ok(_) => assert!(false, "Should have raised an error."),
+            Err(err) => assert_eq!(err.to_string(), "cache entry not found"),
+        }
+    }
+
+    #[async_std::test]
+    async fn update_cache_entry() {
+        let mtt = MTT::new().await;
+        let id = "updateable";
+        let holder = CacheEntry {
+            data: CacheType::Raw("elder".to_string()),
+            last_used: Instant::now() - Duration::from_secs(500),
+        };
+        let mut cache = mtt.db.cache.lock().await;
+        cache.insert(id.to_string(), holder);
+        drop(cache);
+        let expected = "different";
+        let expect = CacheType::Raw(expected.to_string());
+        mtt.db.update_entry(id, expect.clone()).await.unwrap();
+        let output = mtt.db.get_entry(id).await.unwrap();
+        assert_eq!(output.to_string(), expected);
+        let cache = mtt.db.cache.lock().await;
+        let entry = cache.get(id).unwrap();
+        let held = entry.elapsed();
+        assert!(
+            Duration::from_secs(1) > held,
+            "Duration was {:?}, should have been close to 0s.",
+            held
+        );
+        drop(cache);
+        let content = read(mtt.dir.path().join(DATA).join(id)).await.unwrap();
+        assert_eq!(content, expect.to_bytes());
+    }
+
+    #[async_std::test]
+    async fn update_bad_id() {
+        let mtt = MTT::new().await;
+        match mtt
+            .db
+            .update_entry("wilma", CacheType::Raw("wrong".to_string()))
+            .await
+        {
+            Ok(_) => assert!(false, "Bad id should raise an error."),
+            Err(err) => assert_eq!(err.to_string(), "cache entry not found"),
+        }
+    }
+
+    #[async_std::test]
+    async fn update_bad_file() {
+        let mtt = MTT::new().await;
+        let msg = "could not write to file";
+        let id = mtt
+            .db
+            .add_entry(CacheType::Raw("fleeting".to_string()))
+            .await
+            .unwrap();
+        mtt.create_io_error().await;
+        match mtt
+            .db
+            .update_entry(&id, CacheType::Raw("failure".to_string()))
+            .await
+        {
+            Ok(_) => assert!(false, "This should produce a write failure."),
+            Err(err) => {
+                assert_eq!(err.to_string(), "data write");
+                assert!(err.source().is_some(), "Must include the source error.");
+                let err_msg = err.source().unwrap().to_string();
+                assert!(err_msg.contains(msg), "'{}' not in '{}'", msg, err_msg);
+            }
+        }
+    }
+
+    #[async_std::test]
+    async fn remove_entry() {
+        let mtt = MTT::new().await;
+        let id = mtt
+            .db
+            .add_entry(CacheType::Raw("delete".to_string()))
+            .await
+            .unwrap();
+        mtt.db.delete_entry(&id).await.unwrap();
+        match mtt.db.get_entry(&id).await {
+            Ok(_) => assert!(false, "Entry should be removed from cache."),
+            Err(_) => (),
+        };
+    }
+
+    #[async_std::test]
+    async fn remove_missing_entry() {
+        let mtt = MTT::new().await;
+        let msg = "could not remove file";
+        match mtt.db.delete_entry("missing").await {
+            Ok(_) => assert!(false, "This should produce a write failure."),
+            Err(err) => {
+                assert_eq!(err.to_string(), "data delete");
+                assert!(err.source().is_some(), "Must include the source error.");
+                let err_msg = err.source().unwrap().to_string();
+                assert!(err_msg.contains(msg), "'{}' not in '{}'", msg, err_msg);
+            }
+        }
+    }
+
+    #[async_std::test]
+    async fn remove_older() {
+        let mtt = MTT::new().await;
+        let id = mtt
+            .db
+            .add_entry(CacheType::Raw("removed".to_string()))
+            .await
+            .unwrap();
+        let mut cache = mtt.db.cache.lock().await;
+        let entry = cache.get_mut(&id).unwrap();
+        entry.last_used = Instant::now() - Duration::from_secs(1000);
+        drop(cache);
+        sleep(Duration::from_secs(2)).await;
+        let cache = mtt.db.cache.lock().await;
+        let output = cache.get(&id);
+        assert!(output.is_none(), "The entry shoould not be in memory.");
+        drop(cache);
+        let filename = mtt.db.filename(&id);
+        let fpath = Path::new(&filename);
+        assert!(
+            fpath.is_file().await,
+            "The stored version should still exist."
+        );
+    }
+
+    #[async_std::test]
+    async fn keep_newer() {
+        let mtt = MTT::new().await;
+        let id = mtt
+            .db
+            .add_entry(CacheType::Raw("keep".to_string()))
+            .await
+            .unwrap();
+        sleep(Duration::from_secs(2)).await;
+        let cache = mtt.db.cache.lock().await;
+        let output = cache.get(&id);
+        assert!(output.is_some(), "The entry shoould be in memory.");
+    }
+}
+
+#[cfg(test)]
+mod cache_entry {
+    use super::*;
+
+    #[test]
+    fn init() {
+        let text = "new entry";
+        let holder = CacheEntry::new(CacheType::Raw(text.to_string()));
+        assert_eq!(holder.to_string(), text);
+        let held = holder.elapsed();
+        assert!(
+            Duration::from_secs(1) > held,
+            "Duration was {:?}, should have been close to 0s.",
+            held
+        );
+    }
+
+    #[test]
+    fn older() {
+        let secs = 800;
+        let holder = CacheEntry {
+            data: CacheType::Raw("older".to_string()),
+            last_used: Instant::now() - Duration::from_secs(secs),
+        };
+        let held = holder.elapsed() - Duration::from_secs(secs);
+        assert!(
+            Duration::from_secs(1) > held,
+            "{:?} should be close to {}s",
+            holder.elapsed(),
+            secs
+        );
+    }
+
+    #[test]
+    fn accessed() {
+        let mut holder = CacheEntry {
+            data: CacheType::Raw("older".to_string()),
+            last_used: Instant::now() - Duration::from_secs(700),
+        };
+        holder.touch();
+        let held = holder.elapsed();
+        assert!(
+            Duration::from_secs(1) > held,
+            "Duration was {:?}, should have been close to 0s.",
+            held
+        );
+    }
+
+    #[test]
+    fn updated() {
+        let text = "new data";
+        let mut holder = CacheEntry {
+            data: CacheType::Raw("old data".to_string()),
+            last_used: Instant::now() - Duration::from_secs(900),
+        };
+        holder.update(CacheType::Raw(text.to_string()));
+        assert_eq!(holder.to_string(), text);
+        let held = holder.elapsed();
+        assert!(
+            Duration::from_secs(1) > held,
+            "Duration was {:?}, should have been close to 0s.",
+            held
+        );
+    }
+}
+
+#[cfg(test)]
+mod enum_ctype {
+    use super::*;
+
+    #[test]
+    fn bad_file_header() {
+        let mut data: Vec<u8> = Vec::new();
+        let mut ctype = "jlksdfg".as_bytes().to_vec();
+        let mut cdata = "ghjk".as_bytes().to_vec();
+        data.append(&mut ctype);
+        data.push(0);
+        data.append(&mut cdata);
+        match CacheType::from_bytes(data) {
+            Ok(_) => assert!(false, "This should fail."),
+            Err(err) => assert_eq!(err.to_string(), "data corruption"),
+        }
+    }
+
+    #[test]
+    fn incomplete_file() {
+        let mut data: Vec<u8> = Vec::new();
+        let mut ctype = "uoisfde".as_bytes().to_vec();
+        data.append(&mut ctype);
+        match CacheType::from_bytes(data) {
+            Ok(_) => assert!(false, "This should fail."),
+            Err(err) => assert_eq!(err.to_string(), "incomplete file"),
+        }
+    }
+
+    #[test]
+    fn empty_file() {
+        let data: Vec<u8> = Vec::new();
+        match CacheType::from_bytes(data) {
+            Ok(_) => assert!(false, "This should fail."),
+            Err(err) => assert_eq!(err.to_string(), "empty file"),
+        }
+    }
+
+    #[test]
+    fn get_raw_type() {
+        let holder = CacheType::Raw("nothing important".to_string());
+        assert_eq!(holder.entry_type(), "Raw");
+    }
+
+    #[test]
+    fn get_raw_bytes() {
+        let data = "addams";
+        let holder = CacheType::Raw(data.to_string());
+        let mut expected = holder.entry_type().into_bytes();
+        expected.push(0);
+        expected.append(&mut data.as_bytes().to_vec());
+        let output = holder.to_bytes();
+        assert_eq!(output, expected);
+    }
+
+    #[test]
+    fn from_raw_bytes() {
+        let holder = CacheType::Raw("stored item".to_string());
+        let data = holder.to_bytes();
+        let output = CacheType::from_bytes(data).unwrap();
+        assert_eq!(output.to_string(), holder.to_string());
+    }
+
+    #[test]
+    fn get_dbmap_type() {
+        let holder = CacheType::DBMap(Store::new());
+        assert_eq!(holder.entry_type(), "DBMap");
+    }
+
+    #[test]
+    fn get_new_databases_bytes() {
+        let holder = CacheType::DBMap(Store::new());
+        let mut expected = "DBMap".as_bytes().to_vec();
+        expected.push(0);
+        let output = holder.to_bytes();
+        assert_eq!(output, expected);
+    }
+
+    #[test]
+    fn from_new_databases_bytes() {
+        let mut data = "DBMap".as_bytes().to_vec();
+        data.push(0);
+        let output = CacheType::from_bytes(data).unwrap();
+        assert_eq!(output.entry_type(), "DBMap");
+    }
+
+    #[test]
+    fn get_tablemap_type() {
+        let holder = CacheType::TableMap;
+        assert_eq!(holder.entry_type(), "TableMap");
+    }
+
+    #[test]
+    fn get_new_database_bytes() {
+        let holder = CacheType::TableMap;
+        let mut expected = "TableMap".as_bytes().to_vec();
+        expected.push(0);
+        let output = holder.to_bytes();
+        assert_eq!(output, expected);
+    }
+
+    #[test]
+    fn from_new_database_bytes() {
+        let mut data = "TableMap".as_bytes().to_vec();
+        data.push(0);
+        let output = CacheType::from_bytes(data).unwrap();
+        assert_eq!(output.entry_type(), "TableMap");
+    }
+}

src/morethantext/mod.rs

@@ -1,823 +1,186 @@
 mod cache;
 mod database;
-pub mod error;
+mod error;
 mod store;
+mod table;
 
 use async_std::{
-    fs::{create_dir, read, remove_file, write},
-    path::Path,
-    sync::{Arc, Mutex},
-    task::{sleep, spawn},
+    channel::{unbounded, Sender},
+    path::PathBuf,
+    task::spawn,
 };
+use cache::Cache;
 use database::Database;
-use error::{DBError, ErrorCode};
-use rand::{distributions::Alphanumeric, thread_rng, Rng};
-use std::{
-    collections::HashMap,
-    fmt, slice, str,
-    time::{Duration, Instant},
-};
+use error::{ErrorCode, MTTError};
 use store::Store;
+use table::Table;
 
-const DATA: &str = "data";
-const ENTRY: &str = "databases";
+const ENTRY: &str = "EntryPoint";
 
-trait FileData<F> {
-    fn to_bytes(&self) -> Vec<u8>;
-    fn from_bytes(data: &mut slice::Iter<u8>) -> Result<F, DBError>;
+#[derive(Debug)]
+pub struct ToCacheMsg<D> {
+    data: D,
+    result: Sender<FromCache>,
 }
 
-trait SessionData {
-    fn add(&mut self, key: &str, value: &str, data: &str) -> Result<Vec<String>, DBError>;
-    fn eq(&self, key: &str, value: &str) -> Result<Vec<String>, DBError>;
-    fn list(&self, keys: Vec<&str>) -> Result<Vec<String>, DBError>;
+#[derive(Debug)]
+pub enum ToCache {
+    Get(ToCacheMsg<String>),
+    Commit(ToCacheMsg<Store>),
 }
 
-#[derive(Clone)]
-pub enum CacheType {
-    Raw(String),
-    DBMap(Store),
-    TableMap,
+#[derive(Clone, Debug)]
+pub enum FromCache {
+    Ok,
+    Str(Store),
+    DB(Database),
+    Error(MTTError),
 }
 
-impl CacheType {
-    pub fn entry_type(&self) -> String {
-        match self {
-            CacheType::Raw(_) => "Raw".to_string(),
-            CacheType::DBMap(_) => "DBMap".to_string(),
-            CacheType::TableMap => "TableMap".to_string(),
-        }
-    }
-
-    pub fn to_bytes(&self) -> Vec<u8> {
-        let mut output = self.entry_type().into_bytes();
-        output.push(0);
-        match self {
-            CacheType::Raw(s) => output.append(&mut s.as_bytes().to_vec()),
-            CacheType::DBMap(_) => (),
-            CacheType::TableMap => (),
-        }
-        return output;
-    }
-
-    pub fn from_bytes(data: Vec<u8>) -> Result<CacheType, DBError> {
-        let mut data_iter = data.iter();
-        let mut letter: u8;
-        match data_iter.next() {
-            Some(item) => letter = *item,
-            None => return Err(DBError::new("empty file")),
-        }
-        let mut header: Vec<u8> = Vec::new();
-        while letter != 0 {
-            header.push(letter.clone());
-            match data_iter.next() {
-                Some(item) => letter = *item,
-                None => return Err(DBError::new("incomplete file")),
-            }
-        }
-        let header = str::from_utf8(&header).unwrap().to_string();
-        match header.as_str() {
-            "Raw" => {
-                let mut output: Vec<u8> = Vec::new();
-                for letter in data_iter {
-                    output.push(letter.clone());
-                }
-                Ok(CacheType::Raw(str::from_utf8(&output).unwrap().to_string()))
-            }
-            "DBMap" => Ok(CacheType::DBMap(Store::new())),
-            "TableMap" => Ok(CacheType::TableMap),
-            _ => Err(DBError::new("data corruption")),
-        }
-    }
+#[derive(Clone, Debug)]
+pub struct Data<D> {
+    id: Option<String>,
+    data: Option<D>,
 }
 
-impl fmt::Display for CacheType {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            CacheType::Raw(s) => write!(f, "{}", s),
-            CacheType::DBMap(_) => todo!(),
-            CacheType::TableMap => todo!(),
-        }
-    }
-}
-
-#[derive(Clone)]
-struct CacheEntry {
-    data: CacheType,
-    last_used: Instant,
-}
-
-impl CacheEntry {
-    fn new(data: CacheType) -> Self {
+impl<D> Data<D> {
+    fn from_id<S>(id: S) -> Self
+    where
+        S: Into<String>,
+    {
         Self {
-            data: data,
-            last_used: Instant::now(),
+            id: Some(id.into()),
+            data: None,
         }
     }
 
-    fn elapsed(&self) -> Duration {
-        self.last_used.elapsed()
-    }
-
-    fn touch(&mut self) {
-        self.last_used = Instant::now();
-    }
-
-    fn update(&mut self, data: CacheType) {
-        self.data = data;
-        self.touch();
-    }
-}
-
-impl fmt::Display for CacheEntry {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", self.data)
+    fn from_data(data: D) -> Self {
+        Self {
+            id: None,
+            data: Some(data),
+        }
     }
 }
 
 #[derive(Clone)]
 pub struct MoreThanText {
-    cache: Arc<Mutex<HashMap<String, CacheEntry>>>,
-    dir: String,
-    session: Vec<String>,
+    to_cache: Sender<ToCache>,
+    entry: Data<Store>,
 }
 
 impl MoreThanText {
-    pub async fn new(dir: &str) -> Result<Self, DBError> {
-        let data_dir = Path::new(dir).join(DATA);
-        if !data_dir.is_dir().await {
-            match create_dir(&data_dir).await {
-                Ok(_) => (),
-                Err(err) => {
-                    let mut error = DBError::new("failed to create data directory");
-                    error.add_source(err);
-                    return Err(error);
-                }
-            }
+    fn new(to_cache: Sender<ToCache>) -> Self {
+        Self {
+            to_cache: to_cache,
+            entry: Data::from_id(ENTRY),
         }
-        let mut output = Self {
-            cache: Arc::new(Mutex::new(HashMap::new())),
-            dir: data_dir.to_str().unwrap().to_string(),
-            session: Vec::new(),
+    }
+
+    async fn session(&self) -> Result<Store, MTTError> {
+        let (s, r) = unbounded();
+        let msg = ToCacheMsg {
+            data: ENTRY.to_string(),
+            result: s,
         };
-        let entry_file = Path::new(dir).join(ENTRY);
-        let id: String;
-        if entry_file.is_file().await {
-            let holder = read(entry_file).await.unwrap();
-            id = str::from_utf8(&holder).unwrap().to_string();
-        } else {
-            id = output
-                .add_entry(CacheType::DBMap(Store::new()))
-                .await
-                .unwrap();
-            write(entry_file, id.as_bytes()).await.unwrap();
+        self.to_cache.send(ToCache::Get(msg)).await.unwrap();
+        match r.recv().await.unwrap() {
+            FromCache::Str(store) => Ok(store),
+            FromCache::Error(err) => Err(err),
+            _ => unreachable!(),
         }
-        output.session.push(id);
-        let looper = output.cache.clone();
-        spawn(async move {
-            let hold_time = Duration::from_secs(300);
-            loop {
-                sleep(Duration::from_secs(1)).await;
-                let mut ids: Vec<String> = Vec::new();
-                let mut cache = looper.lock().await;
-                for (id, entry) in cache.iter() {
-                    if entry.elapsed() > hold_time {
-                        ids.push(id.to_string());
-                    }
-                }
-                for id in ids.iter() {
-                    cache.remove(id);
-                }
-            }
-        });
-        Ok(output)
     }
 
-    fn filename(&self, id: &str) -> String {
-        let filename = Path::new(&self.dir).join(&id);
-        filename.into_os_string().into_string().unwrap()
-    }
-
-    fn new_id(&self) -> String {
-        thread_rng().sample_iter(&Alphanumeric).take(64).collect()
-    }
-
-    async fn add(&self, feature: &str, key: &str, value: &str) -> Self {
-        let mut ids: Vec<String> = Vec::new();
-        for id in self.session.clone().into_iter() {
-            let holder = self.get_entry(&id).await.unwrap();
-            //holder.add(feature, key, value);
-        }
-        let mut output = self.clone();
-        output.session.clear();
-        output.session.push(value.to_string());
-        output
-    }
-
-    async fn list(&self, feature: Vec<&str>) -> Result<Vec<String>, DBError> {
-        Ok(Vec::new())
-    }
-
-    async fn add_entry(&self, entry: CacheType) -> Result<String, DBError> {
-        let mut id: String = "".to_string();
-        let mut dup = true;
-        while dup {
-            id = thread_rng().sample_iter(&Alphanumeric).take(32).collect();
-            dup = Path::new(&self.dir).join(&id).as_path().exists().await;
-        }
-        match write(Path::new(&self.filename(&id)), entry.to_bytes()).await {
-            Ok(_) => (),
-            Err(err) => {
-                let mut error = DBError::new("data write");
-                error.add_source(err);
-                return Err(error);
-            }
+    async fn commit(&self, store: Store) -> Result<(), MTTError> {
+        let (s, r) = unbounded();
+        let msg = ToCacheMsg {
+            data: store,
+            result: s,
         };
-        let mut cache = self.cache.lock().await;
-        let data = CacheEntry::new(entry);
-        cache.insert(id.clone(), data);
-        Ok(id)
-    }
-
-    async fn get_entry(&self, id: &str) -> Result<CacheEntry, DBError> {
-        let mut cache = self.cache.lock().await;
-        match cache.get_mut(id) {
-            Some(entry) => {
-                entry.touch();
-                Ok(entry.clone())
-            }
-            None => match read(Path::new(&self.filename(id))).await {
-                Ok(content) => {
-                    let data = CacheEntry::new(CacheType::from_bytes(content).unwrap());
-                    cache.insert(id.to_string(), data.clone());
-                    Ok(data)
-                }
-                Err(_) => Err(DBError::new("cache entry not found")),
-            },
-        }
-    }
-
-    async fn update_entry(&self, id: &str, entry: CacheType) -> Result<(), DBError> {
-        match self.get_entry(id).await {
-            Ok(_) => (),
-            Err(err) => return Err(err),
-        }
-        match write(Path::new(&self.filename(id)), entry.to_bytes()).await {
-            Ok(_) => (),
-            Err(err) => {
-                let mut error = DBError::new("data write");
-                error.add_source(err);
-                return Err(error);
-            }
-        }
-        let mut cache = self.cache.lock().await;
-        let data = CacheEntry::new(entry);
-        cache.insert(id.to_string(), data);
-        Ok(())
-    }
-
-    async fn delete_entry(&self, id: &str) -> Result<(), DBError> {
-        let mut cache = self.cache.lock().await;
-        cache.remove(id);
-        match remove_file(Path::new(&self.filename(id))).await {
-            Ok(_) => Ok(()),
-            Err(err) => {
-                let mut error = DBError::new("data delete");
-                error.add_source(err);
-                Err(error)
-            }
+        self.to_cache.send(ToCache::Commit(msg)).await.unwrap();
+        match r.recv().await.unwrap() {
+            FromCache::Ok => Ok(()),
+            FromCache::Error(err) => Err(err),
+            _ => unreachable!(),
         }
     }
 }
 
 #[cfg(test)]
-mod setup {
+mod mtt {
     use super::*;
-    use async_std::fs::remove_dir_all;
-    use tempfile::{tempdir, TempDir};
-
-    pub struct MTT {
-        pub db: MoreThanText,
-        pub dir: TempDir,
-    }
-
-    impl MTT {
-        pub async fn new() -> Self {
-            let dir = tempdir().unwrap();
-            let db = MoreThanText::new(dir.path().to_str().unwrap())
-                .await
-                .unwrap();
-            Self { db: db, dir: dir }
-        }
-
-        pub async fn create_io_error(&self) {
-            remove_dir_all(self.dir.path().join(DATA)).await.unwrap();
-        }
-    }
-}
-
-#[cfg(test)]
-mod init {
-    use super::*;
-    use std::error::Error;
     use tempfile::tempdir;
 
     #[async_std::test]
-    async fn create_data_dir() {
+    async fn create_new() {
         let dir = tempdir().unwrap();
-        MoreThanText::new(dir.path().to_str().unwrap())
-            .await
-            .unwrap();
-        let data_dir = dir.path().join(DATA);
-        assert!(data_dir.is_dir(), "Did not create the data directory.");
-        dir.close().unwrap();
+        let mtt = start_db(dir.path()).await.unwrap();
+        assert_eq!(mtt.entry.id, Some(ENTRY.to_string()));
+        assert!(mtt.entry.data.is_none());
+        let store = mtt.session().await.unwrap();
+        let expected: Vec<String> = Vec::new();
+        assert_eq!(store.list(), expected);
     }
 
     #[async_std::test]
-    async fn existing_data_dir() {
+    async fn commit_db() {
         let dir = tempdir().unwrap();
-        let data_dir = dir.path().join(DATA);
-        create_dir(data_dir).await.unwrap();
-        MoreThanText::new(dir.path().to_str().unwrap())
-            .await
-            .unwrap();
-        dir.close().unwrap();
+        let db = "fred";
+        let mtt = start_db(dir.path()).await.unwrap();
+        let mut store = mtt.session().await.unwrap();
+        store.add(db).unwrap();
+        mtt.commit(store).await.unwrap();
+        let store2 = mtt.session().await.unwrap();
+        assert_eq!(store2.list(), [db]);
     }
 
     #[async_std::test]
-    async fn bad_data_dir() {
-        let msg = "could not create directory";
-        match MoreThanText::new("kljsdgfhslkfrh").await {
-            Ok(_) => assert!(false, "This test should fail to create a data directory"),
-            Err(err) => {
-                assert_eq!(err.to_string(), "failed to create data directory");
-                assert!(err.source().is_some(), "Must include the source error.");
-                let err_msg = err.source().unwrap().to_string();
-                assert!(err_msg.contains(msg), "'{}' not in '{}'", msg, err_msg);
-            }
-        };
-    }
-
-    #[async_std::test]
-    async fn creates_entry_point() {
+    async fn commit_from_multiple_sources() {
         let dir = tempdir().unwrap();
-        let db = MoreThanText::new(dir.path().to_str().unwrap())
-            .await
-            .unwrap();
-        let entry = dir.path().join(ENTRY);
-        assert!(entry.is_file(), "Did not create entry point file.");
-        let data = read(entry).await.unwrap();
-        let id = str::from_utf8(&data).unwrap();
-        let cache = db.get_entry(&id).await.unwrap();
-        assert_eq!(cache.data.entry_type(), "DBMap");
-        assert_eq!(db.session, [id]);
+        let mtt1 = start_db(dir.path()).await.unwrap();
+        let mtt2 = mtt1.clone();
+        let db1 = "first";
+        let db2 = "second";
+        let mut store1 = mtt1.session().await.unwrap();
+        let mut store2 = mtt2.session().await.unwrap();
+        store1.add(db1).unwrap();
+        store2.add(db2).unwrap();
+        mtt1.commit(store1).await.unwrap();
+        mtt2.commit(store2).await.unwrap();
+        let output = mtt1.session().await.unwrap();
+        assert_eq!(output.list(), [db1, db2]);
     }
 
     #[async_std::test]
-    async fn use_existing_entry_point() {
+    async fn fail_on_duplicates() {
         let dir = tempdir().unwrap();
-        let db1 = MoreThanText::new(dir.path().to_str().unwrap())
-            .await
-            .unwrap();
-        let db2 = MoreThanText::new(dir.path().to_str().unwrap())
-            .await
-            .unwrap();
-        assert_eq!(db1.session, db2.session, "Did not read existing entry.");
+        let mtt1 = start_db(dir.path()).await.unwrap();
+        let mtt2 = mtt1.clone();
+        let name = "unique_only";
+        let mut store1 = mtt1.session().await.unwrap();
+        let mut store2 = mtt2.session().await.unwrap();
+        store1.add(name).unwrap();
+        store2.add(name).unwrap();
+        mtt1.commit(store1).await.unwrap();
+        let output = mtt2.commit(store2).await;
+        match output {
+            Ok(_) => assert!(false, "Should have returned an error"),
+            Err(err) => match err.code {
+                ErrorCode::DuplicateDatabase(_) => (),
+                _ => assert!(false, "{:?} is not ErrorCode::DuplicateDatabase", err.code),
+            },
+        }
     }
 }
 
-#[cfg(test)]
-mod data {
-    use super::*;
-    use setup::MTT;
-
-    #[async_std::test]
-    async fn ids_are_random() {
-        let mtt = MTT::new().await;
-        let id1 = mtt.db.new_id();
-        let id2 = mtt.db.new_id();
-        assert_ne!(id1, id2, "Ids should be random");
-    }
-
-    #[async_std::test]
-    async fn add_database() {
-        let mtt = MTT::new().await;
-        let name = "fred";
-        let id = "*gsdfg";
-        let output = mtt.db.add("database", name, id).await;
-        assert_eq!(output.session, [id], "should update session info.");
-        /*
-        assert_eq!(
-            mtt.db.list(["database"].to_vec()).await.unwrap(),
-            [name],
-            "Should list the databases."
-        );
-        */
-    }
-}
-
-#[cfg(test)]
-mod cache_test {
-    use super::*;
-    use async_std::fs::read;
-    use setup::MTT;
-    use std::error::Error;
-
-    #[async_std::test]
-    async fn entry_ids_are_random() {
-        let mtt = MTT::new().await;
-        let data1 = CacheType::Raw("one".to_string());
-        let data2 = CacheType::Raw("two".to_string());
-        let id1 = mtt.db.add_entry(data1).await.unwrap();
-        let id2 = mtt.db.add_entry(data2).await.unwrap();
-        assert_ne!(id1, id2, "Ids should be unique.")
-    }
-
-    #[async_std::test]
-    async fn store_cache() {
-        let mtt = MTT::new().await;
-        let data = "something";
-        let expected = CacheType::Raw(data.to_string());
-        let id = mtt.db.add_entry(expected.clone()).await.unwrap();
-        let output = mtt.db.get_entry(&id).await.unwrap();
-        assert_eq!(output.to_string(), data);
-        let dfile = mtt.dir.path().join(DATA).join(&id);
-        assert!(dfile.is_file(), "Cache file should exist.");
-        let content = read(dfile).await.unwrap();
-        assert_eq!(content, expected.to_bytes());
-    }
-
-    #[async_std::test]
-    async fn get_entry_uodates_time() {
-        let mtt = MTT::new().await;
-        let id = "something";
-        let holder = CacheEntry {
-            data: CacheType::Raw("old".to_string()),
-            last_used: Instant::now() - Duration::from_secs(200),
-        };
-        let mut cache = mtt.db.cache.lock().await;
-        cache.insert(id.to_string(), holder);
-        drop(cache);
-        mtt.db.get_entry(&id).await.unwrap();
-        let cache = mtt.db.cache.lock().await;
-        let entry = cache.get(id).unwrap();
-        let held = entry.elapsed();
-        assert!(
-            Duration::from_secs(1) > held,
-            "Duration was {:?}, should have been close to 0s.",
-            held
-        );
-    }
-
-    #[async_std::test]
-    async fn retrieve_from_disk() {
-        let mtt = MTT::new().await;
-        let id = "someid";
-        let data = CacheType::Raw("stored".to_string());
-        write(mtt.dir.path().join(DATA).join(id), data.to_bytes())
-            .await
-            .unwrap();
-        let output = mtt.db.get_entry(id).await.unwrap();
-        assert_eq!(output.to_string(), data.to_string());
-        let cache = mtt.db.cache.lock().await;
-        let stored = cache.get(id);
-        assert!(stored.is_some(), "Did not store entry in the cache.");
-    }
-
-    #[async_std::test]
-    async fn store_bad_file() {
-        let mtt = MTT::new().await;
-        let msg = "could not write to file";
-        mtt.create_io_error().await;
-        match mtt.db.add_entry(CacheType::Raw("fail".to_string())).await {
-            Ok(_) => assert!(false, "This test should fail."),
-            Err(err) => {
-                assert_eq!(err.to_string(), "data write");
-                assert!(err.source().is_some(), "Must include the source error.");
-                let err_msg = err.source().unwrap().to_string();
-                assert!(err_msg.contains(msg), "'{}' not in '{}'", msg, err_msg);
-            }
-        }
-    }
-
-    #[async_std::test]
-    async fn retrieve_bad_id() {
-        let mtt = MTT::new().await;
-        match mtt.db.get_entry(&"Not Valid").await {
-            Ok(_) => assert!(false, "Should have raised an error."),
-            Err(err) => assert_eq!(err.to_string(), "cache entry not found"),
-        }
-    }
-
-    #[async_std::test]
-    async fn update_cache_entry() {
-        let mtt = MTT::new().await;
-        let id = "updateable";
-        let holder = CacheEntry {
-            data: CacheType::Raw("elder".to_string()),
-            last_used: Instant::now() - Duration::from_secs(500),
-        };
-        let mut cache = mtt.db.cache.lock().await;
-        cache.insert(id.to_string(), holder);
-        drop(cache);
-        let expected = "different";
-        let expect = CacheType::Raw(expected.to_string());
-        mtt.db.update_entry(id, expect.clone()).await.unwrap();
-        let output = mtt.db.get_entry(id).await.unwrap();
-        assert_eq!(output.to_string(), expected);
-        let cache = mtt.db.cache.lock().await;
-        let entry = cache.get(id).unwrap();
-        let held = entry.elapsed();
-        assert!(
-            Duration::from_secs(1) > held,
-            "Duration was {:?}, should have been close to 0s.",
-            held
-        );
-        drop(cache);
-        let content = read(mtt.dir.path().join(DATA).join(id)).await.unwrap();
-        assert_eq!(content, expect.to_bytes());
-    }
-
-    #[async_std::test]
-    async fn update_bad_id() {
-        let mtt = MTT::new().await;
-        match mtt
-            .db
-            .update_entry("wilma", CacheType::Raw("wrong".to_string()))
-            .await
-        {
-            Ok(_) => assert!(false, "Bad id should raise an error."),
-            Err(err) => assert_eq!(err.to_string(), "cache entry not found"),
-        }
-    }
-
-    #[async_std::test]
-    async fn update_bad_file() {
-        let mtt = MTT::new().await;
-        let msg = "could not write to file";
-        let id = mtt
-            .db
-            .add_entry(CacheType::Raw("fleeting".to_string()))
-            .await
-            .unwrap();
-        mtt.create_io_error().await;
-        match mtt
-            .db
-            .update_entry(&id, CacheType::Raw("failure".to_string()))
-            .await
-        {
-            Ok(_) => assert!(false, "This should produce a write failure."),
-            Err(err) => {
-                assert_eq!(err.to_string(), "data write");
-                assert!(err.source().is_some(), "Must include the source error.");
-                let err_msg = err.source().unwrap().to_string();
-                assert!(err_msg.contains(msg), "'{}' not in '{}'", msg, err_msg);
-            }
-        }
-    }
-
-    #[async_std::test]
-    async fn remove_entry() {
-        let mtt = MTT::new().await;
-        let id = mtt
-            .db
-            .add_entry(CacheType::Raw("delete".to_string()))
-            .await
-            .unwrap();
-        mtt.db.delete_entry(&id).await.unwrap();
-        match mtt.db.get_entry(&id).await {
-            Ok(_) => assert!(false, "Entry should be removed from cache."),
-            Err(_) => (),
-        };
-    }
-
-    #[async_std::test]
-    async fn remove_missing_entry() {
-        let mtt = MTT::new().await;
-        let msg = "could not remove file";
-        match mtt.db.delete_entry("missing").await {
-            Ok(_) => assert!(false, "This should produce a write failure."),
-            Err(err) => {
-                assert_eq!(err.to_string(), "data delete");
-                assert!(err.source().is_some(), "Must include the source error.");
-                let err_msg = err.source().unwrap().to_string();
-                assert!(err_msg.contains(msg), "'{}' not in '{}'", msg, err_msg);
-            }
-        }
-    }
-
-    #[async_std::test]
-    async fn remove_older() {
-        let mtt = MTT::new().await;
-        let id = mtt
-            .db
-            .add_entry(CacheType::Raw("removed".to_string()))
-            .await
-            .unwrap();
-        let mut cache = mtt.db.cache.lock().await;
-        let entry = cache.get_mut(&id).unwrap();
-        entry.last_used = Instant::now() - Duration::from_secs(1000);
-        drop(cache);
-        sleep(Duration::from_secs(2)).await;
-        let cache = mtt.db.cache.lock().await;
-        let output = cache.get(&id);
-        assert!(output.is_none(), "The entry shoould not be in memory.");
-        drop(cache);
-        let filename = mtt.db.filename(&id);
-        let fpath = Path::new(&filename);
-        assert!(
-            fpath.is_file().await,
-            "The stored version should still exist."
-        );
-    }
-
-    #[async_std::test]
-    async fn keep_newer() {
-        let mtt = MTT::new().await;
-        let id = mtt
-            .db
-            .add_entry(CacheType::Raw("keep".to_string()))
-            .await
-            .unwrap();
-        sleep(Duration::from_secs(2)).await;
-        let cache = mtt.db.cache.lock().await;
-        let output = cache.get(&id);
-        assert!(output.is_some(), "The entry shoould be in memory.");
-    }
-}
-
-#[cfg(test)]
-mod cache_entry {
-    use super::*;
-
-    #[test]
-    fn init() {
-        let text = "new entry";
-        let holder = CacheEntry::new(CacheType::Raw(text.to_string()));
-        assert_eq!(holder.to_string(), text);
-        let held = holder.elapsed();
-        assert!(
-            Duration::from_secs(1) > held,
-            "Duration was {:?}, should have been close to 0s.",
-            held
-        );
-    }
-
-    #[test]
-    fn older() {
-        let secs = 800;
-        let holder = CacheEntry {
-            data: CacheType::Raw("older".to_string()),
-            last_used: Instant::now() - Duration::from_secs(secs),
-        };
-        let held = holder.elapsed() - Duration::from_secs(secs);
-        assert!(
-            Duration::from_secs(1) > held,
-            "{:?} should be close to {}s",
-            holder.elapsed(),
-            secs
-        );
-    }
-
-    #[test]
-    fn accessed() {
-        let mut holder = CacheEntry {
-            data: CacheType::Raw("older".to_string()),
-            last_used: Instant::now() - Duration::from_secs(700),
-        };
-        holder.touch();
-        let held = holder.elapsed();
-        assert!(
-            Duration::from_secs(1) > held,
-            "Duration was {:?}, should have been close to 0s.",
-            held
-        );
-    }
-
-    #[test]
-    fn updated() {
-        let text = "new data";
-        let mut holder = CacheEntry {
-            data: CacheType::Raw("old data".to_string()),
-            last_used: Instant::now() - Duration::from_secs(900),
-        };
-        holder.update(CacheType::Raw(text.to_string()));
-        assert_eq!(holder.to_string(), text);
-        let held = holder.elapsed();
-        assert!(
-            Duration::from_secs(1) > held,
-            "Duration was {:?}, should have been close to 0s.",
-            held
-        );
-    }
-}
-
-#[cfg(test)]
-mod enum_ctype {
-    use super::*;
-
-    #[test]
-    fn bad_file_header() {
-        let mut data: Vec<u8> = Vec::new();
-        let mut ctype = "jlksdfg".as_bytes().to_vec();
-        let mut cdata = "ghjk".as_bytes().to_vec();
-        data.append(&mut ctype);
-        data.push(0);
-        data.append(&mut cdata);
-        match CacheType::from_bytes(data) {
-            Ok(_) => assert!(false, "This should fail."),
-            Err(err) => assert_eq!(err.to_string(), "data corruption"),
-        }
-    }
-
-    #[test]
-    fn incomplete_file() {
-        let mut data: Vec<u8> = Vec::new();
-        let mut ctype = "uoisfde".as_bytes().to_vec();
-        data.append(&mut ctype);
-        match CacheType::from_bytes(data) {
-            Ok(_) => assert!(false, "This should fail."),
-            Err(err) => assert_eq!(err.to_string(), "incomplete file"),
-        }
-    }
-
-    #[test]
-    fn empty_file() {
-        let data: Vec<u8> = Vec::new();
-        match CacheType::from_bytes(data) {
-            Ok(_) => assert!(false, "This should fail."),
-            Err(err) => assert_eq!(err.to_string(), "empty file"),
-        }
-    }
-
-    #[test]
-    fn get_raw_type() {
-        let holder = CacheType::Raw("nothing important".to_string());
-        assert_eq!(holder.entry_type(), "Raw");
-    }
-
-    #[test]
-    fn get_raw_bytes() {
-        let data = "addams";
-        let holder = CacheType::Raw(data.to_string());
-        let mut expected = holder.entry_type().into_bytes();
-        expected.push(0);
-        expected.append(&mut data.as_bytes().to_vec());
-        let output = holder.to_bytes();
-        assert_eq!(output, expected);
-    }
-
-    #[test]
-    fn from_raw_bytes() {
-        let holder = CacheType::Raw("stored item".to_string());
-        let data = holder.to_bytes();
-        let output = CacheType::from_bytes(data).unwrap();
-        assert_eq!(output.to_string(), holder.to_string());
-    }
-
-    #[test]
-    fn get_dbmap_type() {
-        let holder = CacheType::DBMap(Store::new());
-        assert_eq!(holder.entry_type(), "DBMap");
-    }
-
-    #[test]
-    fn get_new_databases_bytes() {
-        let holder = CacheType::DBMap(Store::new());
-        let mut expected = "DBMap".as_bytes().to_vec();
-        expected.push(0);
-        let output = holder.to_bytes();
-        assert_eq!(output, expected);
-    }
-
-    #[test]
-    fn from_new_databases_bytes() {
-        let mut data = "DBMap".as_bytes().to_vec();
-        data.push(0);
-        let output = CacheType::from_bytes(data).unwrap();
-        assert_eq!(output.entry_type(), "DBMap");
-    }
-
-    #[test]
-    fn get_tablemap_type() {
-        let holder = CacheType::TableMap;
-        assert_eq!(holder.entry_type(), "TableMap");
-    }
-
-    #[test]
-    fn get_new_database_bytes() {
-        let holder = CacheType::TableMap;
-        let mut expected = "TableMap".as_bytes().to_vec();
-        expected.push(0);
-        let output = holder.to_bytes();
-        assert_eq!(output, expected);
-    }
-
-    #[test]
-    fn from_new_database_bytes() {
-        let mut data = "TableMap".as_bytes().to_vec();
-        data.push(0);
-        let output = CacheType::from_bytes(data).unwrap();
-        assert_eq!(output.entry_type(), "TableMap");
-    }
+pub async fn start_db<P>(dir: P) -> Result<MoreThanText, MTTError>
+where
+    P: Into<PathBuf>,
+{
+    let path = dir.into();
+    let (s, r) = unbounded();
+    spawn(async move {
+        let mut cache = Cache::new(path).await;
+        cache.listen(r).await;
+    });
+    Ok(MoreThanText::new(s))
 }

src/morethantext/mttsql.pest

@@ -0,0 +1,6 @@
+char = _{ ASCII_ALPHANUMERIC | "_" }
+whitespace = _{" " | "\t" | "\r" | "\n"}
+
+name = {char+}
+command = {"create database" ~ whitespace+ ~ name ~ ";"}
+script = {command+}

src/morethantext/old-mod.rs

@@ -0,0 +1,398 @@
+/*
+use async_std::sync::{Arc, RwLock};
+use std::{collections::HashMap, error::Error, fmt, str::FromStr};
+
+#[derive(Debug)]
+pub struct DBError {
+    detail: String,
+    source: Option<Box<DBError>>,
+}
+
+impl DBError {
+    fn new(detail: String) -> Self {
+        Self {
+            detail: detail.to_string(),
+            source: None,
+        }
+    }
+}
+
+impl fmt::Display for DBError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", &self.detail)
+    }
+}
+
+impl Error for DBError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match &self.source {
+            Some(err) => Some(err),
+            None => None,
+        }
+    }
+}
+
+#[derive(Clone, PartialEq)]
+pub enum FieldType {
+    Table,
+}
+
+impl fmt::Display for FieldType {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            FieldType::Table => write!(f, "table"),
+        }
+    }
+}
+
+impl FromStr for FieldType {
+    type Err = DBError;
+
+    fn from_str(input: &str) -> Result<FieldType, Self::Err> {
+        match input {
+            "table" => Ok(FieldType::Table),
+            _ => Err(DBError::new(format!("field type {} does not exist", input))),
+        }
+    }
+}
+
+pub struct Table {
+    fields: Arc<RwLock<HashMap<String, FieldType>>>,
+}
+
+impl Table {
+    pub async fn new() -> Self {
+        Self {
+            fields: Arc::new(RwLock::new(HashMap::new())),
+        }
+    }
+
+    pub async fn update_field(&self, name: &str, ftype: &str) -> Result<(), Box<dyn Error>> {
+        let ftype = match FieldType::from_str(ftype) {
+            Ok(field) => field,
+            Err(err) => {
+                let mut error = DBError::new(format!("failed to add field {}", name));
+                error.source = Some(Box::new(err));
+                return Err(Box::new(error));
+            }
+        };
+        let mut fmap = self.fields.write().await;
+        match fmap.get(name) {
+            Some(_) => Err(Box::new(DBError::new(format!(
+                "field {} already exists",
+                name
+            )))),
+            None => {
+                fmap.insert(name.to_string(), ftype);
+                Ok(())
+            }
+        }
+    }
+
+    pub async fn fields(&self) -> HashMap<String, FieldType> {
+        let fmap = self.fields.read().await;
+        fmap.clone()
+    }
+}
+*/
+use async_std::sync::{Arc, RwLock};
+use std::collections::HashMap;
+
+pub mod error;
+mod fieldtype;
+
+use error::MTTError;
+use fieldtype::FieldType;
+
+#[derive(Clone)]
+pub struct MoreThanText;
+
+impl MoreThanText {
+    pub async fn new() -> Self {
+        Self {}
+    }
+
+    pub async fn add_table(&self, name: &str) -> Table {
+        Table::new()
+    }
+
+    pub async fn get_table(&self, name: &str) -> Table {
+        Table::new()
+    }
+}
+
+#[derive(Clone, PartialEq)]
+struct FieldDef;
+
+pub struct Table {
+    fields: Arc<RwLock<HashMap<String, FieldDef>>>,
+}
+
+impl Table {
+    fn new() -> Self {
+        Self {
+            fields: Arc::new(RwLock::new(HashMap::new())),
+        }
+    }
+
+    async fn add_field(&self, name: &str) {
+        let mut field_defs = self.fields.write().await;
+        field_defs.insert(name.to_string(), FieldDef {});
+    }
+
+    async fn get_field(&self, name: &str) -> Option<FieldDef> {
+        let field_defs = self.fields.read().await;
+        match field_defs.get(name) {
+            Some(def) => Some(def.clone()),
+            None => None,
+        }
+    }
+
+    async fn new_record(&self) -> Record {
+        Record::new()
+    }
+}
+
+struct Record {
+    data: Arc<RwLock<HashMap<String, FieldType>>>,
+}
+
+impl Record {
+    fn new() -> Self {
+        Self {
+            data: Arc::new(RwLock::new(HashMap::new())),
+        }
+    }
+
+    /*
+    async fn update_field(&self, name: String, data: FieldType) {
+        let mut map = self.data.write().await;
+        map.insert(name, data);
+    }
+
+    async fn get_field(&self, name: &str) -> Option<FieldType> {
+        let map = self.data.read().await;
+        match map.get(name) {
+            Some(field) => Some(field.clone()),
+            None => None,
+        }
+    }
+    */
+}
+
+#[cfg(test)]
+mod databases {
+    use super::*;
+
+    #[async_std::test]
+    async fn new_database() {
+        MoreThanText::new().await;
+    }
+
+    async fn add_table() {
+        let db = MoreThanText::new().await;
+        let name = "table";
+        db.add_table(name).await;
+        db.get_table(name).await;
+    }
+}
+
+#[cfg(test)]
+mod tables {
+    use super::*;
+
+    #[test]
+    fn new_table() {
+        Table::new();
+    }
+
+    #[async_std::test]
+    async fn add_field_definition() {
+        let tbl = Table::new();
+        let name = "field";
+        let expected = FieldDef {};
+        tbl.add_field(name).await;
+        let output = tbl.get_field(name).await.unwrap();
+        assert!(output == expected, "Did not return a field definition.");
+    }
+
+    #[async_std::test]
+    async fn missing_field_definition() {
+        let tbl = Table::new();
+        let output = tbl.get_field("missing").await;
+        assert!(
+            output == None,
+            "Should return None if field does not exist."
+        );
+    }
+
+    #[async_std::test]
+    async fn get_empty_record() {
+        let tbl = Table::new();
+        tbl.new_record().await;
+    }
+}
+
+#[cfg(test)]
+mod records {
+    use super::*;
+
+    /*
+    #[async_std::test]
+    async fn update_fields() {
+        let rec = Record::new();
+        let name = "elephant";
+        let data = "";
+        let sstr = StaticString::new();
+        rec.update_field(name.to_string(), sstr).await;
+        let output = rec.get_field(name).await.unwrap();
+        assert!(
+            output.to_string() == data,
+            "\n\nGot:  {}\nWant: {}\n\n",
+            output.to_string(),
+            data
+        )
+    }
+
+    #[async_std::test]
+    async fn empty_field() {
+        let rec = Record::new();
+        let name = "mull";
+        let output = rec.get_field(name).await;
+        assert!(output == None, "Should return an option.");
+    }
+    */
+}
+
+/*
+#[cfg(test)]
+mod tables {
+    use super::*;
+
+    #[async_std::test]
+    async fn new_table() {
+        Table::new().await;
+    }
+
+    #[async_std::test]
+    async fn update_field() {
+        let table = Table::new().await;
+        let mut expected: HashMap<String, FieldType> = HashMap::new();
+        expected.insert("stan".to_string(), FieldType::Table);
+        expected.insert("lee".to_string(), FieldType::Table);
+        table.update_field("stan", "table").await.unwrap();
+        table.update_field("lee", "table").await.unwrap();
+        let output = table.fields().await;
+        assert!(output == expected, "Table did not get the fields added.");
+    }
+
+    #[async_std::test]
+    async fn add_bad_field() -> Result<(), String> {
+        let table = Table::new().await;
+        let name = "failure";
+        let bad_type = "ljksdbtt";
+        let expected = format!("failed to add field {}", name);
+        let source = format!("field type {} does not exist", bad_type);
+        match table.update_field(name, bad_type).await {
+            Ok(_) => Err("A bad field type should not return successfully".to_string()),
+            Err(err) => {
+                if format!("{}", err) != expected {
+                    Err(format!("Got: '{}' - Want: '{}'", err, expected))
+                } else if format!("{}", err.source().unwrap()) != source {
+                    Err(format!(
+                        "Got: '{}' - Want: '{}'",
+                        err.source().unwrap(),
+                        source
+                    ))
+                } else {
+                    Ok(())
+                }
+            }
+        }
+    }
+
+    #[async_std::test]
+    async fn add_duplicate_field() -> Result<(), String> {
+        let table = Table::new().await;
+        let name = "twice";
+        let expected = format!("field {} already exists", name);
+        table.update_field(name, "table").await.unwrap();
+        match table.update_field(name, "table").await {
+            Ok(_) => Err(format!("Cannot have two fields with named '{}'", name)),
+            Err(err) => {
+                if format!("{}", err) == expected {
+                    Ok(())
+                } else {
+                    Err(format!("Got: '{}' - Want: '{}'", err, expected))
+                }
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod databases {
+    use super::*;
+
+    #[async_std::test]
+    async fn new_database() {
+        MoreThanText::new().await;
+    }
+
+    #[async_std::test]
+    async fn add_table() {
+        let db = MoreThanText::new().await;
+        db.add_table("fred".to_string()).await;
+    }
+}
+
+#[cfg(test)]
+mod fieldtypes {
+    use super::*;
+
+    fn get_field_map() -> HashMap<String, FieldType> {
+        let mut fields: HashMap<String, FieldType> = HashMap::new();
+        fields.insert("table".to_string(), FieldType::Table);
+        return fields;
+    }
+
+    #[test]
+    fn convert_to_string() {
+        for (key, value) in get_field_map().iter() {
+            assert!(
+                key == &value.to_string(),
+                "\n\nGot:  {}\nWant: {}\n\n",
+                value.to_string(),
+                key
+            );
+        }
+    }
+
+    #[test]
+    fn convert_from_string() {
+        for (key, value) in get_field_map().iter() {
+            assert!(
+                &FieldType::from_str(key).unwrap() == value,
+                "\n\nDid not return a FieldType::{}",
+                key
+            );
+        }
+    }
+
+    #[test]
+    fn convert_from_string_error() -> Result<(), String> {
+        let ftype = "lkjsdfh";
+        let expected = format!("field type {} does not exist", ftype);
+        match FieldType::from_str(ftype) {
+            Ok(_) => Err(format!("Found field type {}", ftype)),
+            Err(err) => {
+                if format!("{}", err) == expected {
+                    Ok(())
+                } else {
+                    Err(format!("Got: '{}' - Want: '{}'", err, expected))
+                }
+            }
+        }
+    }
+}
+*/

src/morethantext/old-mod2.rs

@@ -0,0 +1,120 @@
+pub mod error;
+pub mod fieldtype;
+
+use async_std::sync::{Arc, RwLock};
+use error::MTTError;
+use std::collections::HashMap;
+
+#[derive(Clone)]
+pub struct MoreThanText {
+    tables: Arc<RwLock<HashMap<String, Table>>>,
+}
+
+impl MoreThanText {
+    pub async fn new() -> Self {
+        Self {
+            tables: Arc::new(RwLock::new(HashMap::new())),
+        }
+    }
+
+    pub async fn new_table<S>(&self, tname: S) -> Result<Table, MTTError>
+    where
+        S: Into<String>,
+    {
+        let mut tables = self.tables.write().await;
+        let name = tname.into();
+        match tables.get(&name) {
+            Some(_) => Err(MTTError::new(format!("table {} already exists", name))),
+            None => {
+                let table = Table::new().await;
+                tables.insert(name, table.clone());
+                Ok(table)
+            }
+        }
+    }
+
+    pub async fn get_table(&self, name: &str) -> Option<Table> {
+        let tables = self.tables.read().await;
+        match tables.get(name) {
+            Some(tbl) => Some(tbl.clone()),
+            None => None,
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct Table;
+
+impl Table {
+    pub async fn new() -> Self {
+        Self {}
+    }
+
+    async fn new_column(&self, _name: &str, _type: &str) {}
+}
+
+#[cfg(test)]
+mod database {
+    use super::*;
+
+    #[async_std::test]
+    async fn create_table_with_str() {
+        let db = MoreThanText::new().await;
+        db.new_table("william").await.unwrap();
+    }
+
+    #[async_std::test]
+    async fn create_table_with_string() {
+        let db = MoreThanText::new().await;
+        db.new_table("marvin".to_string()).await.unwrap();
+    }
+
+    #[async_std::test]
+    async fn table_names_are_unique() -> Result<(), String> {
+        let db = MoreThanText::new().await;
+        let name = "alexandar";
+        let msg = format!("table {} already exists", name);
+        db.new_table(name).await.unwrap();
+        match db.new_table(name).await {
+            Ok(_) => Err("Duplicate table names are not allowed.".to_string()),
+            Err(err) => {
+                if err.to_string() == msg {
+                    Ok(())
+                } else {
+                    Err(format!(
+                        "Error message is incorrect: Got: '{}' Want: '{}'",
+                        err.to_string(),
+                        msg
+                    ))
+                }
+            }
+        }
+    }
+
+    #[async_std::test]
+    async fn get_non_existant_table() {
+        let db = MoreThanText::new().await;
+        let table = db.get_table("missing").await;
+        assert!(table.is_none(), "There should be no table.");
+    }
+
+    #[async_std::test]
+    async fn get_a_table() {
+        let db = MoreThanText::new().await;
+        let name = "here";
+        db.new_table(name).await.unwrap();
+        let table = db.get_table(name).await;
+        assert!(table.is_some(), "Table should be found.");
+    }
+}
+
+#[cfg(test)]
+mod table {
+    use super::*;
+
+    #[async_std::test]
+    async fn add_column() {
+        let tbl = Table::new().await;
+        tbl.new_column("fred", "StaticString").await;
+    }
+}

src/morethantext/old-mod3.rs

@@ -0,0 +1,153 @@
+pub mod error;
+
+use async_std::sync::{Arc, RwLock};
+use error::DBError;
+use std::collections::HashMap;
+
+#[derive(Clone)]
+pub struct MoreThanText {
+    databases: Arc<RwLock<HashMap<String, Database>>>,
+}
+
+impl MoreThanText {
+    pub async fn new() -> Self {
+        Self {
+            databases: Arc::new(RwLock::new(HashMap::new())),
+        }
+    }
+
+    async fn create_database(&self, name: &str) -> Result<(), DBError> {
+        let mut databases = self.databases.write().await;
+        match databases.get(name) {
+            Some(_) => Err(DBError::new("duplicate database name")),
+            None => {
+                let db = Database::new().await;
+                databases.insert(name.to_string(), db);
+                Ok(())
+            }
+        }
+    }
+
+    async fn use_database(&self, name: &str) -> Result<Database, DBError> {
+        let databases = self.databases.read().await;
+        match databases.get(name) {
+            Some(db) => Ok(db.clone()),
+            None => Err(DBError::new("database name not found")),
+        }
+    }
+}
+
+#[derive(Clone)]
+struct Database;
+
+impl Database {
+    async fn new() -> Self {
+        Self {}
+    }
+
+    async fn add_table(&self, _name: &str) {}
+}
+
+struct Table;
+
+impl Table {
+    async fn new() -> Self {
+        Self {}
+    }
+}
+
+#[cfg(test)]
+mod engine_functions {
+    use super::*;
+
+    #[async_std::test]
+    async fn create_database() {
+        let mtt = MoreThanText::new().await;
+        mtt.create_database("smith").await.unwrap();
+    }
+
+    #[async_std::test]
+    async fn database_names_must_be_unique() -> Result<(), DBError> {
+        let mtt = MoreThanText::new().await;
+        let msg = "duplicate database name";
+        mtt.create_database("john").await.unwrap();
+        match mtt.create_database("john").await {
+            Ok(_) => Err(DBError::new("Duplicate names should cause error")),
+            Err(err) => {
+                if err.to_string() == msg {
+                    Ok(())
+                } else {
+                    Err(DBError::new(format!(
+                        "incorrect err message: got: '{}' want: '{}'",
+                        err.to_string(),
+                        msg
+                    )))
+                }
+            }
+        }
+    }
+
+    #[async_std::test]
+    async fn use_database() -> Result<(), DBError> {
+        let mtt = MoreThanText::new().await;
+        let dbname = "Johnson";
+        mtt.create_database(dbname).await.unwrap();
+        mtt.use_database(dbname).await.unwrap();
+        Ok(())
+    }
+
+    #[async_std::test]
+    async fn use_missing_database() -> Result<(), DBError> {
+        let error = "database name not found";
+        let mtt = MoreThanText::new().await;
+        match mtt.use_database("ssmith").await {
+            Ok(_) => Err(DBError::new("Should raise database missing error")),
+            Err(err) => {
+                if err.to_string() == error {
+                    Ok(())
+                } else {
+                    Err(DBError::new(format!(
+                        "Incorrect error message: Got '{}' Want '{}'",
+                        err.to_string(),
+                        error
+                    )))
+                }
+            }
+        }
+    }
+
+    #[async_std::test]
+    async fn create_get_table() {
+        let db = "thedatabase";
+        let mtt = MoreThanText::new().await;
+        mtt.create_database(db).await.unwrap();
+        let dbase = mtt.use_database(db).await.unwrap();
+        dbase.add_table("melvin").await;
+    }
+}
+
+#[cfg(test)]
+mod database_functions {
+    use super::*;
+
+    #[async_std::test]
+    async fn new_database() {
+        Database::new().await;
+    }
+
+    #[async_std::test]
+    async fn new_table() {
+        let db = Database::new().await;
+        db.add_table("fred").await;
+    }
+}
+
+#[cfg(test)]
+mod table_functions {
+    use super::*;
+
+    #[async_std::test]
+    async fn new_table() {
+        Table::new().await;
+    }
+}

src/morethantext/store-old.rs

@@ -0,0 +1,306 @@
+use super::{DBError, ErrorCode, FileData, SessionData};
+use std::{collections::HashMap, slice, str};
+
+#[derive(Clone)]
+pub struct Store {
+    db_map: HashMap<String, String>,
+}
+
+impl Store {
+    pub fn new() -> Self {
+        Self {
+            db_map: HashMap::new(),
+        }
+    }
+
+    fn test_key(key: &str) -> Result<(), DBError> {
+        match key {
+            "database" => (),
+            _ => return Err(DBError::new(format!("databases do not have a {}", key))),
+        }
+        Ok(())
+    }
+}
+
+impl FileData<Self> for Store {
+    fn to_bytes(&self) -> Vec<u8> {
+        let mut output = Vec::new();
+        for (name, id) in self.db_map.iter() {
+            output.append(&mut name.as_bytes().to_vec());
+            output.push(0);
+            output.append(&mut id.as_bytes().to_vec());
+            output.push(0);
+        }
+        output
+    }
+
+    fn from_bytes(data: &mut slice::Iter<u8>) -> Result<Self, DBError> {
+        let mut output = Store::new();
+        let mut name: Vec<u8> = Vec::new();
+        let mut id: Vec<u8> = Vec::new();
+        let mut get_id = false;
+        let mut letter: u8;
+        loop {
+            match data.next() {
+                Some(a) => letter = a.clone(),
+                None => {
+                    if !name.is_empty() {
+                        return Err(DBError::from_code(ErrorCode::CorruptFile));
+                    }
+                    break;
+                }
+            }
+            if letter == 0 {
+                if get_id {
+                    let name_holder = match str::from_utf8(&name) {
+                        Ok(item) => item,
+                        Err(_) => return Err(DBError::from_code(ErrorCode::CorruptFile)),
+                    };
+                    let id_holder = match str::from_utf8(&id) {
+                        Ok(item) => item,
+                        Err(_) => return Err(DBError::from_code(ErrorCode::CorruptFile)),
+                    };
+                    match output.add("database", name_holder, id_holder) {
+                        Ok(_) => (),
+                        Err(err) => {
+                            let mut error = DBError::from_code(ErrorCode::CorruptFile);
+                            error.add_source(err);
+                            return Err(error);
+                        }
+                    };
+                    name.clear();
+                    id.clear();
+                }
+                get_id = !get_id;
+            } else {
+                if get_id {
+                    id.push(letter);
+                } else {
+                    name.push(letter);
+                }
+            }
+        }
+        Ok(output)
+    }
+}
+
+impl SessionData for Store {
+    fn add(&mut self, key: &str, value: &str, data: &str) -> Result<Vec<String>, DBError> {
+        match Self::test_key(key) {
+            Ok(_) => (),
+            Err(err) => return Err(err),
+        }
+        match self.db_map.get(value) {
+            Some(_) => return Err(DBError::new(format!("database {} already exists", value))),
+            None => (),
+        }
+        self.db_map.insert(value.to_string(), data.to_string());
+        let mut output = Vec::new();
+        output.push(data.to_string());
+        Ok(output)
+    }
+
+    fn eq(&self, key: &str, value: &str) -> Result<Vec<String>, DBError> {
+        match Self::test_key(key) {
+            Ok(_) => (),
+            Err(err) => return Err(err),
+        }
+        let mut output = Vec::new();
+        match self.db_map.get(value) {
+            Some(data) => output.push(data.to_string()),
+            None => (),
+        }
+        Ok(output)
+    }
+
+    fn list(&self, keys: Vec<&str>) -> Result<Vec<String>, DBError> {
+        for key in keys {
+            match Self::test_key(key) {
+                Ok(_) => (),
+                Err(err) => return Err(err),
+            }
+        }
+        let mut names: Vec<String> = self.db_map.clone().into_keys().collect();
+        names.sort();
+        Ok(names)
+    }
+}
+
+#[cfg(test)]
+mod file_data {
+    use super::*;
+    use std::error::Error;
+
+    #[test]
+    fn to_bytes_new() {
+        let dbs = Store::new();
+        let expected: Vec<u8> = Vec::new();
+        let output = dbs.to_bytes();
+        assert_eq!(output, expected);
+    }
+
+    #[test]
+    fn to_bytes_with_database() {
+        let mut dbs = Store::new();
+        let name = "something";
+        let id = "id";
+        dbs.add("database", name, id).unwrap();
+        let mut expected: Vec<u8> = Vec::new();
+        expected.append(&mut name.as_bytes().to_vec());
+        expected.push(0);
+        expected.append(&mut id.as_bytes().to_vec());
+        expected.push(0);
+        let output = dbs.to_bytes();
+        assert_eq!(output, expected);
+    }
+
+    #[test]
+    fn from_bytes() {
+        let mut dbs = Store::new();
+        dbs.add("database", "one", "1").unwrap();
+        dbs.add("database", "two", "2").unwrap();
+        dbs.add("database", "three", "3").unwrap();
+        let data = dbs.to_bytes();
+        let mut feed = data.iter();
+        let output = Store::from_bytes(&mut feed).unwrap();
+        assert_eq!(output.db_map, dbs.db_map);
+    }
+
+    #[test]
+    fn from_bytes_incomplete_name() -> Result<(), DBError> {
+        let data = "notName".as_bytes();
+        let mut feed = data.iter();
+        match Store::from_bytes(&mut feed) {
+            Ok(_) => Err(DBError::new("should have produced an errpr")),
+            Err(err) => match err.code {
+                ErrorCode::CorruptFile => Ok(()),
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+
+    #[test]
+    fn from_bytes_incomplete_id() -> Result<(), DBError> {
+        let mut data = "proper".as_bytes().to_vec();
+        data.push(0);
+        data.append(&mut "nope".as_bytes().to_vec());
+        let mut feed = data.iter();
+        match Store::from_bytes(&mut feed) {
+            Ok(_) => Err(DBError::new("should have produced an error")),
+            Err(err) => match err.code {
+                ErrorCode::CorruptFile => Ok(()),
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+
+    #[test]
+    fn from_bytes_handles_error() -> Result<(), DBError> {
+        let name = "duplicate";
+        let mut data = name.as_bytes().to_vec();
+        data.push(0);
+        data.append(&mut "first".as_bytes().to_vec());
+        data.push(0);
+        data.append(&mut "duplicate".as_bytes().to_vec());
+        data.push(0);
+        data.append(&mut "second".as_bytes().to_vec());
+        data.push(0);
+        let mut feed = data.iter();
+        match Store::from_bytes(&mut feed) {
+            Ok(_) => Err(DBError::new("should have returned an error")),
+            Err(err) => match err.code {
+                ErrorCode::CorruptFile => {
+                    assert!(
+                        err.source().is_some(),
+                        "Should state file corruption cause."
+                    );
+                    assert_eq!(
+                        err.source().unwrap().to_string(),
+                        format!("database {} already exists", name)
+                    );
+                    Ok(())
+                }
+                _ => Err(DBError::new("incorrect error code")),
+            },
+        }
+    }
+}
+
+#[cfg(test)]
+mod session_data {
+    use super::*;
+
+    #[test]
+    fn add_new() {
+        let mut dbs = Store::new();
+        let key = "database";
+        let value = "marvin";
+        let data = "123456";
+        assert_eq!(dbs.add(key, value, data).unwrap(), [data]);
+        let output = dbs.eq(key, value).unwrap();
+        assert_eq!(output, [data]);
+    }
+
+    #[test]
+    fn add_bad_key() {
+        let mut dbs = Store::new();
+        let key = "sdgfjksg";
+        match dbs.add(key, "fred", "barney") {
+            Ok(_) => assert!(false, "Bad keys should produce an error."),
+            Err(err) => assert_eq!(err.to_string(), format!("databases do not have a {}", key)),
+        }
+    }
+
+    #[test]
+    fn get_bad_key() {
+        let dbs = Store::new();
+        let key = "bvdfgert";
+        match dbs.eq(key, "fred") {
+            Ok(_) => assert!(false, "Bad keys should produce an error."),
+            Err(_) => (),
+        }
+    }
+
+    #[test]
+    fn unique_names() {
+        let mut dbs = Store::new();
+        let value = "wilma";
+        dbs.add("database", value, "something").unwrap();
+        match dbs.add("database", value, "overwrite") {
+            Ok(_) => assert!(false, "Duplicate names should produce an error."),
+            Err(err) => assert_eq!(
+                err.to_string(),
+                format!("database {} already exists", value)
+            ),
+        }
+    }
+
+    #[test]
+    fn get_missing() {
+        let dbs = Store::new();
+        let output = dbs.eq("database", "melvin").unwrap();
+        assert_eq!(output, Vec::<String>::new());
+    }
+
+    #[test]
+    fn list_bad_keys() {
+        let dbs = Store::new();
+        let key = "sdfgren";
+        let keys = [key];
+        match dbs.list(keys.to_vec()) {
+            Ok(_) => assert!(false, "Bad keys should error."),
+            Err(err) => assert_eq!(err.to_string(), format!("databases do not have a {}", key)),
+        }
+    }
+
+    #[test]
+    fn list_is_sorted() {
+        let mut dbs = Store::new();
+        let mut data = ["fred", "barney", "wilma", "betty", "pebbles", "bambam"];
+        for db in data {
+            dbs.add("database", db, db).unwrap();
+        }
+        data.sort();
+        assert_eq!(dbs.list(["database"].to_vec()).unwrap(), data);
+    }
+}

src/morethantext/store.rs

@@ -1,307 +1,171 @@
-use super::{DBError, ErrorCode, FileData, SessionData};
-use std::{collections::HashMap, slice, str};
+use super::{Data, Database, ErrorCode, MTTError};
+use std::collections::HashMap;
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct Store {
-    db_map: HashMap<String, String>,
+    data: HashMap<String, Data<Database>>,
 }
 
 impl Store {
     pub fn new() -> Self {
         Self {
-            db_map: HashMap::new(),
+            data: HashMap::new(),
         }
     }
 
-    fn test_key(key: &str) -> Result<(), DBError> {
-        match key {
-            "database" => (),
-            _ => return Err(DBError::new(format!("databases do not have a {}", key))),
-        }
-        Ok(())
-    }
-}
-
-impl FileData<Self> for Store {
-    fn to_bytes(&self) -> Vec<u8> {
-        let mut output = Vec::new();
-        for (name, id) in self.db_map.iter() {
-            output.append(&mut name.as_bytes().to_vec());
-            output.push(0);
-            output.append(&mut id.as_bytes().to_vec());
-            output.push(0);
-        }
-        output
-    }
-
-    fn from_bytes(data: &mut slice::Iter<u8>) -> Result<Self, DBError> {
-        let mut output = Store::new();
-        let mut name: Vec<u8> = Vec::new();
-        let mut id: Vec<u8> = Vec::new();
-        let mut get_id = false;
-        let mut letter: u8;
-        let err_msg = "file corruption";
-        loop {
-            match data.next() {
-                Some(a) => letter = a.clone(),
-                None => {
-                    if !name.is_empty() {
-                        return Err(DBError::from_code(ErrorCode::CorruptFile));
-                    }
-                    break;
-                }
-            }
-            if letter == 0 {
-                if get_id {
-                    let name_holder = match str::from_utf8(&name) {
-                        Ok(item) => item,
-                        Err(_) => return Err(DBError::from_code(ErrorCode::CorruptFile)),
-                    };
-                    let id_holder = match str::from_utf8(&id) {
-                        Ok(item) => item,
-                        Err(_) => return Err(DBError::from_code(ErrorCode::CorruptFile)),
-                    };
-                    match output.add("database", name_holder, id_holder) {
-                        Ok(_) => (),
-                        Err(err) => {
-                            let mut error = DBError::from_code(ErrorCode::CorruptFile);
-                            error.add_source(err);
-                            return Err(error);
-                        }
-                    };
-                    name.clear();
-                    id.clear();
-                }
-                get_id = !get_id;
-            } else {
-                if get_id {
-                    id.push(letter);
-                } else {
-                    name.push(letter);
-                }
+    pub fn add<S>(&mut self, name: S) -> Result<(), MTTError>
+    where
+        S: Into<String>,
+    {
+        let db_name = name.into();
+        match self.get(&db_name) {
+            Some(_) => Err(MTTError::from_code(ErrorCode::DuplicateDatabase(db_name))),
+            None => {
+                self.data.insert(db_name, Data::from_data(Database::new()));
+                Ok(())
             }
         }
-        Ok(output)
-    }
-}
-
-impl SessionData for Store {
-    fn add(&mut self, key: &str, value: &str, data: &str) -> Result<Vec<String>, DBError> {
-        match Self::test_key(key) {
-            Ok(_) => (),
-            Err(err) => return Err(err),
-        }
-        match self.db_map.get(value) {
-            Some(_) => return Err(DBError::new(format!("database {} already exists", value))),
-            None => (),
-        }
-        self.db_map.insert(value.to_string(), data.to_string());
-        let mut output = Vec::new();
-        output.push(data.to_string());
-        Ok(output)
     }
 
-    fn eq(&self, key: &str, value: &str) -> Result<Vec<String>, DBError> {
-        match Self::test_key(key) {
-            Ok(_) => (),
-            Err(err) => return Err(err),
-        }
-        let mut output = Vec::new();
-        match self.db_map.get(value) {
-            Some(data) => output.push(data.to_string()),
-            None => (),
-        }
-        Ok(output)
-    }
-
-    fn list(&self, keys: Vec<&str>) -> Result<Vec<String>, DBError> {
-        for key in keys {
-            match Self::test_key(key) {
-                Ok(_) => (),
-                Err(err) => return Err(err),
+    pub fn add_by_id<S, D>(&mut self, name: S, id: D) -> Result<(), MTTError>
+    where
+        S: Into<String>,
+        D: Into<String>,
+    {
+        let db_name = name.into();
+        match self.get(&db_name) {
+            Some(_) => Err(MTTError::from_code(ErrorCode::DuplicateDatabase(db_name))),
+            None => {
+                self.data.insert(db_name, Data::from_id(id.into()));
+                Ok(())
             }
         }
-        let mut names: Vec<String> = self.db_map.clone().into_keys().collect();
+    }
+
+    pub fn get(&self, name: &str) -> Option<&Data<Database>> {
+        self.data.get(name)
+    }
+
+    pub fn list(&self) -> Vec<String> {
+        let mut names = Vec::new();
+        for name in self.data.keys() {
+            names.push(name.to_string());
+        }
         names.sort();
-        Ok(names)
+        names
     }
 }
 
 #[cfg(test)]
-mod file_data {
+mod storage {
     use super::*;
-    use std::error::Error;
 
     #[test]
-    fn to_bytes_new() {
-        let dbs = Store::new();
-        let expected: Vec<u8> = Vec::new();
-        let output = dbs.to_bytes();
-        assert_eq!(output, expected);
+    fn create_new() {
+        let store = Store::new();
+        let expected: Vec<String> = Vec::new();
+        assert_eq!(store.list(), expected);
     }
 
     #[test]
-    fn to_bytes_with_database() {
-        let mut dbs = Store::new();
-        let name = "something";
-        let id = "id";
-        dbs.add("database", name, id).unwrap();
-        let mut expected: Vec<u8> = Vec::new();
-        expected.append(&mut name.as_bytes().to_vec());
-        expected.push(0);
-        expected.append(&mut id.as_bytes().to_vec());
-        expected.push(0);
-        let output = dbs.to_bytes();
-        assert_eq!(output, expected);
+    fn add_db_by_str() {
+        let mut store = Store::new();
+        let name = "Melvin";
+        store.add(name).unwrap();
+        let output = store.get(name);
+        assert!(output.is_some(), "Get returned none.");
     }
 
     #[test]
-    fn from_bytes() {
-        let mut dbs = Store::new();
-        dbs.add("database", "one", "1").unwrap();
-        dbs.add("database", "two", "2").unwrap();
-        dbs.add("database", "three", "3").unwrap();
-        let data = dbs.to_bytes();
-        let mut feed = data.iter();
-        let output = Store::from_bytes(&mut feed).unwrap();
-        assert_eq!(output.db_map, dbs.db_map);
+    fn add_db_by_string() {
+        let mut store = Store::new();
+        let name = "Marvin";
+        store.add(name.to_string()).unwrap();
+        let output = store.get(name);
+        assert!(output.is_some(), "Get returned none.");
     }
 
     #[test]
-    fn from_bytes_incomplete_name() -> Result<(), DBError> {
-        let data = "notName".as_bytes();
-        let mut feed = data.iter();
-        match Store::from_bytes(&mut feed) {
-            Ok(_) => Err(DBError::new("should have produced an errpr")),
+    fn fail_on_duplicates() -> Result<(), MTTError> {
+        let mut store = Store::new();
+        let name = "Mickie";
+        store.add(name).unwrap();
+        match store.add(name) {
+            Ok(_) => Err(MTTError::new("duplicates should error")),
             Err(err) => match err.code {
-                ErrorCode::CorruptFile => Ok(()),
-                _ => Err(DBError::new("incorrect error code")),
-            },
-        }
-    }
-
-    #[test]
-    fn from_bytes_incomplete_id() -> Result<(), DBError> {
-        let mut data = "proper".as_bytes().to_vec();
-        data.push(0);
-        data.append(&mut "nope".as_bytes().to_vec());
-        let mut feed = data.iter();
-        match Store::from_bytes(&mut feed) {
-            Ok(_) => Err(DBError::new("should have produced an error")),
-            Err(err) => match err.code {
-                ErrorCode::CorruptFile => Ok(()),
-                _ => Err(DBError::new("incorrect error code")),
-            },
-        }
-    }
-
-    #[test]
-    fn from_bytes_handles_error() -> Result<(), DBError> {
-        let name = "duplicate";
-        let mut data = name.as_bytes().to_vec();
-        data.push(0);
-        data.append(&mut "first".as_bytes().to_vec());
-        data.push(0);
-        data.append(&mut "duplicate".as_bytes().to_vec());
-        data.push(0);
-        data.append(&mut "second".as_bytes().to_vec());
-        data.push(0);
-        let mut feed = data.iter();
-        match Store::from_bytes(&mut feed) {
-            Ok(_) => Err(DBError::new("should have returned an error")),
-            Err(err) => match err.code {
-                ErrorCode::CorruptFile => {
-                    assert!(
-                        err.source().is_some(),
-                        "Should state file corruption cause."
-                    );
-                    assert_eq!(
-                        err.source().unwrap().to_string(),
-                        format!("database {} already exists", name)
-                    );
+                ErrorCode::DuplicateDatabase(db_name) => {
+                    assert_eq!(db_name, name);
                     Ok(())
                 }
-                _ => Err(DBError::new("incorrect error code")),
+                _ => Err(MTTError::new(format!("{:?} is not DuplicateDatabase", err))),
             },
         }
     }
-}
-
-#[cfg(test)]
-mod session_data {
-    use super::*;
 
     #[test]
-    fn add_new() {
-        let mut dbs = Store::new();
-        let key = "database";
-        let value = "marvin";
-        let data = "123456";
-        assert_eq!(dbs.add(key, value, data).unwrap(), [data]);
-        let output = dbs.eq(key, value).unwrap();
-        assert_eq!(output, [data]);
+    fn add_using_cache_id() {
+        let mut store = Store::new();
+        let name = "fred";
+        let id = "12345";
+        store.add_by_id(name, id).unwrap();
+        let output = store.get(name).unwrap();
+        assert!(output.data.is_none(), "there should be no data");
+        assert_eq!(output.id, Some(id.to_string()));
     }
 
     #[test]
-    fn add_bad_key() {
-        let mut dbs = Store::new();
-        let key = "sdgfjksg";
-        match dbs.add(key, "fred", "barney") {
-            Ok(_) => assert!(false, "Bad keys should produce an error."),
-            Err(err) => assert_eq!(err.to_string(), format!("databases do not have a {}", key)),
+    fn add_by_cache_id_name_string() {
+        let mut store = Store::new();
+        let name = "barney";
+        let id = "67890";
+        store.add_by_id(name.to_string(), id).unwrap();
+        let output = store.get(name).unwrap();
+        assert!(output.data.is_none(), "there should be no data");
+        assert_eq!(output.id, Some(id.to_string()));
+    }
+
+    #[test]
+    fn no_duplicate_databases_for_add_by_id() {
+        let mut store = Store::new();
+        let name = "betty";
+        store.add_by_id(name, "fghij").unwrap();
+        match store.add_by_id(name, "klmno") {
+            Ok(_) => assert!(false, "Duplicates should error."),
+            Err(err) => match err.code {
+                ErrorCode::DuplicateDatabase(db_name) => assert_eq!(db_name, name),
+                _ => assert!(false, "{:?} is not DuplicateDatabase", err),
+            },
         }
     }
 
     #[test]
-    fn get_bad_key() {
-        let dbs = Store::new();
-        let key = "bvdfgert";
-        match dbs.eq(key, "fred") {
-            Ok(_) => assert!(false, "Bad keys should produce an error."),
-            Err(_) => (),
+    fn add_by_cache_id_string() {
+        let mut store = Store::new();
+        let name = "wilma";
+        let id = "abcdef";
+        store.add_by_id(name, id.to_string()).unwrap();
+        let output = store.get(name).unwrap();
+        assert!(output.data.is_none(), "there should be no data");
+        assert_eq!(output.id, Some(id.to_string()));
+    }
+
+    #[test]
+    fn get_bad_database() -> Result<(), MTTError> {
+        let store = Store::new();
+        match store.get("missing") {
+            Some(_) => Err(MTTError::new("Should have returned None.")),
+            None => Ok(()),
         }
     }
 
     #[test]
-    fn unique_names() {
-        let mut dbs = Store::new();
-        let value = "wilma";
-        dbs.add("database", value, "something").unwrap();
-        match dbs.add("database", value, "overwrite") {
-            Ok(_) => assert!(false, "Duplicate names should produce an error."),
-            Err(err) => assert_eq!(
-                err.to_string(),
-                format!("database {} already exists", value)
-            ),
+    fn get_list() {
+        let mut store = Store::new();
+        let mut ids = ["one", "two", "three", "four", "five"];
+        for name in ids {
+            store.add(name.to_string()).unwrap();
         }
-    }
-
-    #[test]
-    fn get_missing() {
-        let dbs = Store::new();
-        let output = dbs.eq("database", "melvin").unwrap();
-        assert_eq!(output, Vec::<String>::new());
-    }
-
-    #[test]
-    fn list_bad_keys() {
-        let dbs = Store::new();
-        let key = "sdfgren";
-        let keys = [key];
-        match dbs.list(keys.to_vec()) {
-            Ok(_) => assert!(false, "Bad keys should error."),
-            Err(err) => assert_eq!(err.to_string(), format!("databases do not have a {}", key)),
-        }
-    }
-
-    #[test]
-    fn list_is_sorted() {
-        let mut dbs = Store::new();
-        let mut data = ["fred", "barney", "wilma", "betty", "pebbles", "bambam"];
-        for db in data {
-            dbs.add("database", db, db).unwrap();
-        }
-        data.sort();
-        assert_eq!(dbs.list(["database"].to_vec()).unwrap(), data);
+        ids.sort();
+        assert_eq!(store.list(), ids);
     }
 }

src/morethantext/table.rs

@@ -0,0 +1,18 @@
+#[derive(Clone, Debug)]
+pub struct Table;
+
+impl Table {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+#[cfg(test)]
+mod tables {
+    use super::*;
+
+    #[test]
+    fn create_new() {
+        Table::new();
+    }
+}