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import {
Connection,
ConnectionConfig,
ConnectionOptions,
defaultConnectionOptions,
Status,
StoreOptions,
RetrieveOptions,
} from "./connection";
import { Response, StatsResponse } from "./response";
import { Server } from "./server";
import { ConnectionError, ConnectionErrorCode } from "./error";
export interface MemcachedOptions {
poolSize: number;
initSize: number;
removeDeadServer: boolean;
timeout: number;
wait: boolean;
waitTimeout: number;
}
export type Options = Partial<MemcachedOptions & ConnectionOptions>;
const defaultOptions: Options = {
...defaultConnectionOptions,
initSize: 1,
poolSize: 10,
wait: false,
waitTimeout: 3000,
};
export class Memcached extends EventEmitter {
private _connectionId = 0;
private _connectionConfig: ConnectionConfig;
private _connectionPool: Connection[] = [];
private _options: Options;
constructor(args: ConnectionConfig, options?: Options) {
super();
this._connectionConfig = args;
this._options = { ...defaultOptions, ...options };
for (let i = 0; i < this._options.initSize; i++) {
const connectionOptions = options as ConnectionOptions;
const connection = new Connection(
args,
++this._connectionId,
connectionOptions
);
connection.on("close", (connection: Connection) =>
this.emit("close", connection)
);
connection.on("drop", (connection: Connection, server: Server) =>
this.emit("drop", connection, server)
);
this._connectionPool.push(connection);
}
}
public clean(): void {
this._connectionPool.forEach((connection) => {
connection.close(true);
});
}
public async createPool(): Promise<void[]> {
const connTry = this._connectionPool.map((connection: Connection) => {
return connection.connect(Status.IDLE);
});
return await Promise.all(connTry);
}
public getConnection(): Connection {
Iif (this._connectionPool.length === 0) {
const connection = new Connection(
this._connectionConfig,
++this._connectionId
);
this._connectionPool.push(connection);
return connection;
}
const idleConnections = this._getIdleConnections();
if (idleConnections.length > 0) {
const connection = idleConnections[0];
connection.status = Status.RESEARVED;
return idleConnections[0];
}
throw new ConnectionError(
"no connection available",
ConnectionErrorCode.ER_CONN_NO_AVAILABLE
);
}
private _getIdleConnections(): Array<Connection> {
return this._connectionPool.filter((connection: Connection) => {
return connection.isIdle();
});
}
private async _cmd<T>(
fn: (connection?: Connection) => Promise<T>
): Promise<T> {
let connection: Connection;
if (Ethis._options.wait) {
connection = await this._getConnection();
} else {
connection = this.getConnection();
}
const resp = await fn(connection);
connection.close();
return resp;
}
private async _getConnection(): Promise<Connection> {
try {
return this.getConnection();
} catch (err) {
const connErr = err as ConnectionError;
switch (connErr.code) {
case ConnectionErrorCode.ER_CONN_NO_AVAILABLE:
await new Promise((resolve, reject) => {
this._connectionPool.forEach((conn: Connection) => {
const timeout = setTimeout(() => {
reject(
new ConnectionError(
"timout to get connection",
ConnectionErrorCode.ER_CONN_TIMEOUT
)
);
}, this._options.waitTimeout);
conn.once("changeStatus", (id) => {
const connection = this._connectionPool.find(
(conn: Connection) => {
return conn.id === id;
}
);
// this shouldn't happen
if (!connection) {
throw err;
}
clearTimeout(timeout);
connection.status = Status.RESEARVED;
resolve(connection);
});
});
});
break;
}
throw connErr;
}
}
public async createConnection(): Promise<Connection> {
Iif (this._connectionPool.length >= this._options.poolSize) {
throw new ConnectionError(
"connection reached the pool size",
ConnectionErrorCode.ER_CONN_MAX_CONNECTION
);
}
const connectionOptions = this._options as ConnectionOptions;
const connection = new Connection(
this._connectionConfig,
++this._connectionId,
connectionOptions
);
connection.on("close", (connection: Connection) =>
this._handleClose(connection)
);
connection.on("drop", (connection: Connection, server: Server) =>
this._handleDrop(connection, server)
);
this._connectionPool.push(connection);
Iif (this._connectionPool.length === this._options.poolSize) {
this.emit("maxConnection", this._options.poolSize);
}
return connection;
}
private _handleClose(removedConnection: Connection) {
this._connectionPool = this._connectionPool.filter(
(connection: Connection) => {
return connection.id !== removedConnection.id;
}
);
this.emit("close", removedConnection);
}
private _handleDrop(belongingConnection: Connection, server: Server) {
this.emit("drop", belongingConnection, server);
}
public async get(
keys: string | Array<string>,
options?: RetrieveOptions
): Promise<Response> {
return await this._cmd(
async (connection: Connection) => await connection.get(keys, options)
);
}
public async gets(
keys: string | Array<string>,
options?: RetrieveOptions
): Promise<Response> {
return await this._cmd(
async (connection: Connection) => await connection.gets(keys, options)
);
}
public async set(
key: string,
value: string | Record<string, any>,
options?: StoreOptions
): Promise<Response> {
return await this._cmd(
async (connection: Connection) =>
await connection.set(key, value, options)
);
}
public async add(
key: string,
value: string | Record<string, any>,
options?: StoreOptions
): Promise<Response> {
return await this._cmd(
async (connection: Connection) =>
await connection.add(key, value, options)
);
}
public async append(
key: string,
value: string | Record<string, any>,
options?: StoreOptions
): Promise<Response> {
return await this._cmd(
async (connection: Connection) =>
await connection.append(key, value, options)
);
}
public async prepend(
key: string,
value: string | Record<string, any>,
options?: StoreOptions
): Promise<Response> {
return await this._cmd(
async (connection: Connection) =>
await connection.prepend(key, value, options)
);
}
public async replace(
key: string,
value: string | Record<string, any>,
options?: StoreOptions
): Promise<Response> {
return await this._cmd(
async (connection: Connection) =>
await connection.replace(key, value, options)
);
}
public async cas(
key: string,
value: string | Record<string, any>,
casId: number,
options?: StoreOptions
): Promise<Response> {
return await this._cmd(
async (connection: Connection) =>
await connection.cas(key, value, casId, options)
);
}
public async delete(key: string): Promise<Response> {
return await this._cmd(
async (connection: Connection) => await connection.delete(key)
);
}
public async gat(
keys: string | Array<string>,
expire: number,
options?: RetrieveOptions
): Promise<Response> {
return await this._cmd(
async (connection: Connection) =>
await connection.gat(keys, expire, options)
);
}
public async gats(
keys: string | Array<string>,
expire: number,
options?: RetrieveOptions
): Promise<Response> {
return await this._cmd(
async (connection: Connection) =>
await connection.gats(keys, expire, options)
);
}
public async touch(key: string, expires: number): Promise<Response> {
return await this._cmd(
async (connection: Connection) => await connection.touch(key, expires)
);
}
public async stats(): Promise<StatsResponse> {
return await this._cmd(
async (connection: Connection) => await connection.stats()
);
}
}
export function createPool(
args: ConnectionConfig,
options?: MemcachedOptions
): Memcached {
return new Memcached(args, options);
}
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