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import { EventEmitter } from "events";
import { queue, AsyncQueue } from "async";
import {
parseResponseCode,
parseResponse,
parseStatResponse,
Response,
ResponseCode,
Stats,
StatsResponse,
} from "./response";
import { Server, ServerConfigs, ServerConfig } from "./server";
import { MemcachedSocket } from "./socket";
import * as Hashring from "hashring";
import { ConnectionError, ConnectionErrorCode } from "./error";
type TaskQueue = {
commands: Array<string>;
callback: Function;
location: string;
};
export enum Status {
INIT = "INIT",
CONNECTING = "CONNECTING",
IDLE = "IDLE",
RESEARVED = "RESEARVED",
CLOSE = "CLOSE",
}
export interface ConnectionOptions {
mode: modes;
timeout: number;
removeDeadServer: boolean;
retry: boolean;
retryLimit: number;
exponentialBackoff: boolean;
}
export type ConnectionConfig = string | Array<string> | ServerConfigs;
export const defaultConnectionOptions: Partial<ConnectionOptions> = {
mode: "json",
removeDeadServer: true,
timeout: 3000,
retry: true,
retryLimit: 10,
exponentialBackoff: true,
};
type modes = "string" | "json";
export interface StoreOptions {
isCompressed?: boolean;
expires?: number;
mode?: modes;
}
const defaultStoreoptions: StoreOptions = {
isCompressed: false,
expires: 0,
mode: "string",
};
export interface RetrieveOptions {
mode?: modes;
}
const defaultRetriveoptions: RetrieveOptions = {
mode: "string",
};
export class Connection extends EventEmitter {
public status: Status;
public id = 0;
private _servers: Array<Server> = [];
private _sockets: Array<MemcachedSocket> = [];
private _queue: AsyncQueue<any>;
private _hashring: Hashring;
private _options: ConnectionOptions;
constructor(
args: ConnectionConfig,
id = 0,
options?: Partial<ConnectionOptions>
) {
super();
this.status = Status.INIT;
this.id = id;
let servers = [];
switch (Object.prototype.toString.call(args)) {
case "[object Object]":
const serverConfig = args as ServerConfigs;
for (const url in serverConfig) {
const serverOptions = serverConfig[url] as ServerConfig;
servers.push(new Server(url, serverOptions));
}
break;
case "[object Array]":
servers = (args as string[]).map((url: string) => {
return new Server(url);
});
break;
default:
const url = args as string;
servers = [new Server(url)];
break;
}
this._options = {
...defaultConnectionOptions,
...options,
} as ConnectionOptions;
this._servers = servers;
this._hashring = new Hashring(servers);
this._queue = queue(async (task: TaskQueue, errCallBack) => {
const url = task.location;
const socket = this._sockets.find((socket: MemcachedSocket) => {
return socket.server.url === url;
});
Iif (!socket) {
const err = new ConnectionError(
`no socket found for ${url}`,
ConnectionErrorCode.ER_CONN_SOCKET_NOT_FOUND
);
errCallBack(err);
return;
}
const readData = (chunk: Buffer) => {
Eif (socket) {
socket.removeListener("data", readData);
}
task.callback(chunk);
errCallBack(null);
};
socket.on("data", readData);
if (Isocket) {
for (const command of task.commands) {
const fn = () => {
socket.write(Buffer.from(command, "utf8"));
socket.write(`\r\n`);
};
if (Ithis._options.retry) {
await this._retry(fn, this._options.retryLimit);
} else {
fn();
}
}
}
});
}
public async connect(status?: Status): Promise<void> {
this.status = Status.CONNECTING;
const sockets = this._servers.map((server: Server) => {
return this._connect(server, status);
});
await Promise.all(sockets);
}
public join(args: ConnectionConfig) {
if (this.status === Status.CLOSE) {
throw new ConnectionError(
"connection can't be added to close connection",
ConnectionErrorCode.ER_CONN_CLOSED
);
}
let servers: Array<Server> = [];
switch (Object.prototype.toString.call(args)) {
case "[object Object]":
const serverConfig = args as ServerConfigs;
for (const url in serverConfig) {
const serverOptions = serverConfig[url] as ServerConfig;
servers.push(new Server(url, serverOptions));
}
break;
case "[object Array]":
servers = (args as string[]).map((url: string) => {
return new Server(url);
});
break;
default:
const url = args as string;
servers = [new Server(url)];
break;
}
this._servers.push(...servers);
servers.forEach((server) => {
this._hashring.add(server.url);
});
}
public close(force?: boolean): void {
// Memo(KeisukeYamashita):
//
// If the connection belongs to a connection pool,
// make it to idle status for pooling.
if (this.status !== Status.IDLE && this.status !== Status.RESEARVED) {
throw new ConnectionError(
"can't close not open connection",
ConnectionErrorCode.ER_CONN_NOT_OPEN
);
}
if (this.id !== 0) {
this._setStatus(force ? Status.CLOSE : Status.IDLE);
return;
}
this._sockets.forEach((socket: MemcachedSocket) => {
socket.remove();
socket.end();
});
this._setStatus(Status.CLOSE);
this._hashring.end();
}
public isReady(): boolean {
return this.status === Status.IDLE || this.status === Status.RESEARVED;
}
public isIdle(): boolean {
return this.status === Status.IDLE;
}
public async get(
keys: string | Array<string>,
options?: RetrieveOptions
): Promise<Response> {
options = { ...defaultRetriveoptions, ...options };
if (typeof keys === "string") {
keys = [keys];
}
const resps = await Promise.all(
keys.map(async (key) => {
const command = `get ${key}`;
const location = this._hashring.get(key);
const resp = await this._cmd("get", [command], location);
switch (resp.code) {
case ResponseCode.ERROR:
case ResponseCode.SERVER_ERROR:
case ResponseCode.CLIENT_ERROR:
throw new Error("error");
default:
return this._deserialize(options.mode, resp);
}
})
);
return this._mergeMultiGet(resps);
}
public async gets(
keys: string | Array<string>,
options?: RetrieveOptions
): Promise<Response> {
options = { ...defaultRetriveoptions, ...options };
if (typeof keys === "string") {
keys = [keys];
}
const resps = await Promise.all(
keys.map(async (key) => {
const command = `gets ${key}`;
const location = this._hashring.get(key);
const resp = await this._cmd("gets", [command], location);
switch (resp.code) {
case ResponseCode.ERROR:
case ResponseCode.SERVER_ERROR:
case ResponseCode.CLIENT_ERROR:
throw new Error("error");
default:
return this._deserialize(options.mode, resp);
}
})
);
return this._mergeMultiGet(resps);
}
public async set(
key: string,
value: string | Record<string, any>,
options?: StoreOptions
): Promise<Response> {
options = { ...defaultStoreoptions, ...options };
const serializedValue = this._serialize(options?.mode, value);
const byteSize = Buffer.byteLength(serializedValue, "utf8");
const command = `set ${key} ${options?.isCompressed ? 1 : 0} ${
options?.expires
} ${byteSize}`;
const location = this._hashring.get(key);
const resp = await this._cmd("set", [command, serializedValue], location);
switch (resp.code) {
case ResponseCode.EXISTS:
case ResponseCode.STORED:
case ResponseCode.NOT_STORED:
return resp;
default:
throw new Error("error");
}
}
public async add(
key: string,
value: string | Record<string, any>,
options?: StoreOptions
): Promise<Response> {
options = { ...defaultStoreoptions, ...options };
const serializedValue = this._serialize(options?.mode, value);
const byteSize = Buffer.byteLength(serializedValue, "utf8");
const command = `add ${key} ${options.isCompressed ? 1 : 0} ${
options.expires
} ${byteSize}`;
const location = this._hashring.get(key);
const resp = await this._cmd("add", [command, serializedValue], location);
switch (resp.code) {
case ResponseCode.EXISTS:
case ResponseCode.STORED:
case ResponseCode.NOT_STORED:
return resp;
default:
throw new Error("error");
}
}
public async append(
key: string,
value: string | Record<string, any>,
options?: StoreOptions
): Promise<Response> {
options = { ...defaultStoreoptions, ...options };
const serializedValue = this._serialize(options?.mode, value);
const byteSize = Buffer.byteLength(serializedValue, "utf8");
const command = `append ${key} ${options.isCompressed ? 1 : 0} ${
options.expires
} ${byteSize}`;
const location = this._hashring.get(key);
const resp = await this._cmd(
"append",
[command, serializedValue],
location
);
switch (resp.code) {
case ResponseCode.STORED:
case ResponseCode.NOT_STORED:
return resp;
default:
throw new Error("error");
}
}
public async prepend(
key: string,
value: string | Record<string, any>,
options?: StoreOptions
): Promise<Response> {
options = { ...defaultStoreoptions, ...options };
const serializedValue = this._serialize(options?.mode, value);
const byteSize = Buffer.byteLength(serializedValue, "utf8");
const command = `prepend ${key} ${options.isCompressed ? 1 : 0} ${
options.expires
} ${byteSize}`;
const location = this._hashring.get(key);
const resp = await this._cmd(
"prepend",
[command, serializedValue],
location
);
switch (resp.code) {
case ResponseCode.STORED:
case ResponseCode.NOT_STORED:
return resp;
default:
throw new Error("error");
}
}
public async replace(
key: string,
value: string | Record<string, any>,
options?: StoreOptions
): Promise<Response> {
options = { ...defaultStoreoptions, ...options };
const serializedValue = this._serialize(options?.mode, value);
const byteSize = Buffer.byteLength(serializedValue, "utf8");
const command = `replace ${key} ${options.isCompressed ? 1 : 0} ${
options.expires
} ${byteSize}`;
const location = this._hashring.get(key);
const resp = await this._cmd(
"replace",
[command, serializedValue],
location
);
switch (resp.code) {
case ResponseCode.STORED:
case ResponseCode.NOT_STORED:
return this._deserialize(options.mode, resp);
default:
throw new Error("error");
}
}
public async cas(
key: string,
value: string | Record<string, any>,
casId: number,
options?: StoreOptions
): Promise<Response> {
options = { ...defaultStoreoptions, ...options };
const serializedValue = this._serialize(options?.mode, value);
const byteSize = Buffer.byteLength(serializedValue, "utf8");
const command = `cas ${key} ${options.isCompressed ? 1 : 0} ${
options.expires
} ${byteSize} ${casId}`;
const location = this._hashring.get(key);
const resp = await this._cmd("cas", [command, serializedValue], location);
switch (resp.code) {
case ResponseCode.EXISTS:
case ResponseCode.STORED:
case ResponseCode.NOT_STORED:
return resp;
default:
throw new Error("error");
}
}
public async gat(
keys: string | Array<string>,
expire: number,
options?: RetrieveOptions
): Promise<Response> {
options = { ...defaultRetriveoptions, ...options };
Eif (typeof keys === "string") {
keys = [keys];
}
const resps = await Promise.all(
keys.map(async (key) => {
const command = `gat ${expire} ${key}`;
const location = this._hashring.get(key);
const resp = await this._cmd("gat", [command], location);
switch (resp.code) {
case ResponseCode.ERROR:
case ResponseCode.SERVER_ERROR:
case ResponseCode.CLIENT_ERROR:
throw new Error("error");
default:
return this._deserialize(options.mode, resp);
}
})
);
return this._mergeMultiGet(resps);
}
public async gats(
keys: string | Array<string>,
expire: number,
options?: RetrieveOptions
): Promise<Response> {
options = { ...defaultRetriveoptions, ...options };
Eif (typeof keys === "string") {
keys = [keys];
}
const resps = await Promise.all(
keys.map(async (key) => {
const command = `gats ${expire} ${key}`;
const location = this._hashring.get(key);
const resp = await this._cmd("gats", [command], location);
switch (resp.code) {
case ResponseCode.ERROR:
case ResponseCode.SERVER_ERROR:
case ResponseCode.CLIENT_ERROR:
throw new Error("error");
default:
return this._deserialize(options.mode, resp);
}
})
);
return this._mergeMultiGet(resps);
}
public async delete(key: string): Promise<Response> {
const command = `delete ${key}`;
const location = this._hashring.get(key);
const resp = await this._cmd("delete", [command], location);
switch (resp.code) {
case ResponseCode.DELETED:
case ResponseCode.NOT_FOUND:
return resp;
default:
throw new Error("error");
}
}
public remove(url: string) {
this._hashring.remove(url);
Eif (this._sockets.length === 0) {
this._setStatus(Status.CLOSE);
this.emit("close", this);
}
}
public async touch(key: string, expire: number): Promise<Response> {
const command = `touch ${key} ${expire}`;
const location = this._hashring.get(key);
const resp = await this._cmd("touch", [command], location);
switch (resp.code) {
case ResponseCode.TOUCHED:
case ResponseCode.NOT_FOUND:
return resp;
default:
throw new Error("error");
}
}
public async stats(): Promise<StatsResponse> {
const command = "stats";
const results = await Promise.all(
this._servers.map(async (server: Server) => {
const location = server.url;
const resp = await this._cmd(command, [command], location);
return { location, resp };
})
);
const resp: StatsResponse = {
code: ResponseCode.END,
stats: {},
};
results.forEach((r) => {
switch (r.resp.code) {
case ResponseCode.END:
break;
default:
throw new Error("error");
}
const statsu = r.resp.stats as Stats;
resp.stats[r.location] = statsu;
});
return resp;
}
private async _connect(server: Server, status?: Status): Promise<void> {
return new Promise((resolve, reject) => {
const connectOptions: net.NetConnectOpts = {
host: server.host,
port: server.port,
timeout: this._options.timeout,
};
const socket = net.connect(connectOptions);
const memSocket = new MemcachedSocket(socket, server);
memSocket.on("error", (err: Error) => {
reject(err);
Iif (this.listeners("error").length > 0) {
this.emit("error", err, server);
}
});
memSocket.on("timeout", () => {
reject(
new ConnectionError("timeout", ConnectionErrorCode.ER_CONN_TIMEOUT)
);
if (this.listeners("timeout").length > 0) {
this.emit("timeout", server);
}
});
memSocket.on("close", () => this._handleSocketClose(server));
memSocket.on("connect", () => {
this._setStatus(status || Status.RESEARVED);
this._sockets.push(memSocket);
resolve();
});
});
}
private async _cmd(
command: string,
commands: Array<string>,
location: string
): Promise<Response> {
return new Promise((resolve, reject) => {
this._queue.push(
{
commands: commands,
location: location,
callback: (chunk: Buffer) => {
const code = parseResponseCode(chunk);
if (command === "stats") {
const stats = parseStatResponse(chunk);
resolve({ code, stats });
return;
}
const data = parseResponse(chunk);
resolve({ code, data });
},
} as TaskQueue,
(err) => {
Iif (err) reject(err);
}
);
});
}
private _handleSocketClose(server: Server) {
this._remove(server);
Eif (this._sockets.length === 0) {
this._setStatus(Status.CLOSE);
Iif (this.listeners("close").length > 0) {
this.emit("close", this);
}
}
}
private _mergeMultiGet(resps: Response[]): Response {
const result: Response = {
code: ResponseCode.END,
data: {},
};
resps.forEach((resp) => {
Iif (resp.code !== ResponseCode.END) {
throw new Error("not all end with END");
}
Object.keys(resp.data).forEach((key) => {
const value = resp.data[key];
result.data[key] = value;
});
});
return result;
}
// Connection's internal remove will emit the 'drop' event
private _remove(server: string | Server) {
let url: string;
Iif (typeof server === "string") {
url = server;
} else {
url = server.url;
}
Eif (this._options.removeDeadServer) {
this._hashring.remove(url);
this._sockets = this._sockets.filter((socket: MemcachedSocket) => {
return socket.server.url !== url;
});
Iif (this.listeners("drop").length > 0) {
this.emit("drop", this, server);
}
}
}
private async _retry<T>(
fn: () => T | Promise<T>,
retryLimit: number
): Promise<T> {
let attemp = 0;
let err: Error;
const wait = (attempt?: number) => {
const waitSec = this._options.exponentialBackoff
? () => {
return 100;
}
: (attempt: number) => {
return Math.pow(2, attempt);
};
return new Promise((resolve) => {
setTimeout(() => {
resolve();
}, waitSec(attempt));
});
};
while (Itrue) {
Iif (attemp >= retryLimit) {
throw err;
}
try {
return await fn();
} catch (funcErr) {
err = funcErr;
await wait();
attemp++;
}
}
}
private _serialize(
Imode: modes = "string",
value: string | Record<string, any>
): string {
if (mode === "string" && typeof value === "string") {
return value;
}
switch (mode) {
case "json":
return JSON.stringify(value);
default:
throw new Error(`not supported serialize mode ${mode} with Objects`);
}
}
private _deserialize(Imode: modes = "string", resp: Response): Response {
if (mode === "string") {
return resp;
}
Object.keys(resp.data).forEach((key: string) => {
const data = resp.data[key];
let value;
switch (mode) {
case "json":
value = JSON.parse(data.value as string);
break;
default:
throw new Error(`not supported serialize mode ${mode} with Objects`);
}
resp.data[key].value = value;
});
return resp;
}
private _setStatus(newStatus: Status) {
const oldStatus = this.status;
this.status = newStatus;
Iif (this.listeners("changeStatus").length > 0) {
this.emit("changeStatus", this.id, newStatus, oldStatus);
}
}
}
export function createConnection(
args: ConnectionConfig,
options?: ConnectionOptions
): Connection {
return new Connection(args, 0, options);
}
|