| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| use crate::user_info::UserInfo; |
| use std::prelude::v1::*; |
| use std::sync::mpsc::{channel, Sender}; |
| use std::thread; |
| use thiserror::Error; |
| |
| #[derive(Error, Debug)] |
| pub(crate) enum DbError { |
| #[error("user not exist")] |
| UserNotExist, |
| #[error("user exist")] |
| UserExist, |
| #[error("mpsc error")] |
| ConnectionError, |
| #[error("leveldb error")] |
| LevelDbInternalError, |
| #[error("invalid response")] |
| InvalidResponse, |
| #[error("invalid request")] |
| InvalidRequest, |
| } |
| |
| impl<T> From<std::sync::mpsc::SendError<T>> for DbError { |
| fn from(_error: std::sync::mpsc::SendError<T>) -> Self { |
| DbError::ConnectionError |
| } |
| } |
| |
| impl From<std::sync::mpsc::RecvError> for DbError { |
| fn from(_error: std::sync::mpsc::RecvError) -> Self { |
| DbError::ConnectionError |
| } |
| } |
| |
| #[derive(Clone)] |
| struct GetRequest { |
| key: Vec<u8>, |
| } |
| #[derive(Clone)] |
| struct GetResponse { |
| value: Vec<u8>, |
| } |
| |
| #[derive(Clone)] |
| struct CreateRequest { |
| key: Vec<u8>, |
| value: Vec<u8>, |
| } |
| |
| #[derive(Clone)] |
| enum DbRequest { |
| Get(GetRequest), |
| Create(CreateRequest), |
| Ping, |
| } |
| |
| #[derive(Clone)] |
| enum DbResponse { |
| Get(GetResponse), |
| Create, |
| Ping, |
| } |
| |
| #[derive(Clone)] |
| struct DBCall { |
| pub sender: Sender<Result<DbResponse, DbError>>, |
| pub request: DbRequest, |
| } |
| |
| pub(crate) struct Database { |
| sender: Sender<DBCall>, |
| } |
| |
| impl Database { |
| pub(crate) fn open() -> Result<Self, DbError> { |
| let (sender, receiver) = channel(); |
| thread::spawn(move || { |
| let opt = rusty_leveldb::in_memory(); |
| let mut database = rusty_leveldb::DB::open("authentication_db", opt).unwrap(); |
| loop { |
| let call: DBCall = match receiver.recv() { |
| Ok(req) => req, |
| Err(e) => { |
| warn!("mspc receive error: {}", e); |
| break; |
| } |
| }; |
| let sender = call.sender; |
| let response = match call.request { |
| DbRequest::Get(request) => match database.get(&request.key) { |
| Some(value) => Ok(DbResponse::Get(GetResponse { value })), |
| None => Err(DbError::UserNotExist), |
| }, |
| DbRequest::Create(request) => match database.get(&request.key) { |
| Some(_) => Err(DbError::UserExist), |
| None => match database.put(&request.key, &request.value) { |
| Ok(_) => Ok(DbResponse::Create), |
| Err(_) => Err(DbError::LevelDbInternalError), |
| }, |
| }, |
| DbRequest::Ping => Ok(DbResponse::Ping), |
| }; |
| match sender.send(response) { |
| Ok(_) => (), |
| Err(e) => warn!("mpsc send error: {}", e), |
| } |
| } |
| }); |
| |
| let database = Self { sender }; |
| let client = database.get_client(); |
| |
| // Check whether the user database is successfully opened. |
| client.ping()?; |
| |
| Ok(database) |
| } |
| |
| pub(crate) fn get_client(&self) -> DbClient { |
| DbClient { |
| sender: self.sender.clone(), |
| } |
| } |
| } |
| |
| #[derive(Clone)] |
| pub(crate) struct DbClient { |
| sender: Sender<DBCall>, |
| } |
| |
| impl DbClient { |
| pub(crate) fn get_user(&self, id: &str) -> Result<UserInfo, DbError> { |
| let (sender, receiver) = channel(); |
| let request = DbRequest::Get(GetRequest { |
| key: id.as_bytes().to_vec(), |
| }); |
| let call = DBCall { sender, request }; |
| self.sender.send(call)?; |
| let result = receiver.recv()?; |
| let db_response = result?; |
| match db_response { |
| DbResponse::Get(response) => { |
| let user = serde_json::from_slice(&response.value) |
| .map_err(|_| DbError::InvalidResponse)?; |
| Ok(user) |
| } |
| _ => Err(DbError::UserNotExist), |
| } |
| } |
| |
| pub(crate) fn create_user(&self, user: &UserInfo) -> Result<(), DbError> { |
| let (sender, receiver) = channel(); |
| let user_bytes = serde_json::to_vec(&user).map_err(|_| DbError::InvalidRequest)?; |
| let request = DbRequest::Create(CreateRequest { |
| key: user.id.as_bytes().to_vec(), |
| value: user_bytes.to_vec(), |
| }); |
| let call = DBCall { sender, request }; |
| self.sender.send(call)?; |
| let result = receiver.recv()?; |
| let db_response = result?; |
| match db_response { |
| DbResponse::Create => Ok(()), |
| _ => Err(DbError::InvalidResponse), |
| } |
| } |
| |
| // Check whether the database is opened successfully. |
| fn ping(&self) -> Result<(), DbError> { |
| let (sender, receiver) = channel(); |
| let request = DbRequest::Ping; |
| let call = DBCall { sender, request }; |
| self.sender.send(call)?; |
| let result = receiver.recv()?; |
| let db_response = result?; |
| match db_response { |
| DbResponse::Ping => Ok(()), |
| _ => Err(DbError::InvalidResponse), |
| } |
| } |
| } |