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