mirror of
https://github.com/swc-project/swc.git
synced 2024-12-20 20:22:26 +03:00
719 lines
18 KiB
TypeScript
719 lines
18 KiB
TypeScript
// Loaded from https://raw.githubusercontent.com/nats-io/nats.deno/v1.0.0-rc4/nats-base-client/protocol.ts
|
|
|
|
|
|
/*
|
|
* Copyright 2018-2021 The NATS Authors
|
|
* Licensed 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.
|
|
*/
|
|
import {
|
|
ConnectionOptions,
|
|
DebugEvents,
|
|
DEFAULT_MAX_PING_OUT,
|
|
DEFAULT_PING_INTERVAL,
|
|
DEFAULT_RECONNECT_TIME_WAIT,
|
|
Empty,
|
|
Events,
|
|
PublishOptions,
|
|
ServerInfo,
|
|
Status,
|
|
Subscription,
|
|
} from "./types.ts";
|
|
import { newTransport, Transport } from "./transport.ts";
|
|
import { ErrorCode, NatsError } from "./error.ts";
|
|
import {
|
|
CR_LF,
|
|
CRLF,
|
|
Deferred,
|
|
deferred,
|
|
delay,
|
|
extend,
|
|
timeout,
|
|
} from "./util.ts";
|
|
import { nuid } from "./nuid.ts";
|
|
import { DataBuffer } from "./databuffer.ts";
|
|
import { ServerImpl, Servers } from "./servers.ts";
|
|
import { Dispatcher, QueuedIterator } from "./queued_iterator.ts";
|
|
import type { MsgHdrs, MsgHdrsImpl } from "./headers.ts";
|
|
import { SubscriptionImpl } from "./subscription.ts";
|
|
import { Subscriptions } from "./subscriptions.ts";
|
|
import { MuxSubscription } from "./muxsubscription.ts";
|
|
import type { Request } from "./request.ts";
|
|
import { Heartbeat, PH } from "./heartbeats.ts";
|
|
import { Kind, MsgArg, Parser, ParserEvent } from "./parser.ts";
|
|
import { MsgImpl } from "./msg.ts";
|
|
import { fastDecoder, fastEncoder } from "./encoders.ts";
|
|
|
|
const FLUSH_THRESHOLD = 1024 * 32;
|
|
|
|
export const INFO = /^INFO\s+([^\r\n]+)\r\n/i;
|
|
|
|
export function createInbox(prefix: string = ""): string {
|
|
prefix = prefix || "_INBOX";
|
|
if (typeof prefix !== "string") {
|
|
throw (new Error("prefix must be a string"));
|
|
}
|
|
return `${prefix}.${nuid.next()}`;
|
|
}
|
|
|
|
const PONG_CMD = fastEncoder("PONG\r\n");
|
|
const PING_CMD = fastEncoder("PING\r\n");
|
|
|
|
export class Connect {
|
|
echo?: boolean;
|
|
no_responders?: boolean;
|
|
protocol: number;
|
|
verbose?: boolean;
|
|
pedantic?: boolean;
|
|
jwt?: string;
|
|
nkey?: string;
|
|
sig?: string;
|
|
user?: string;
|
|
pass?: string;
|
|
auth_token?: string;
|
|
tls_required?: boolean;
|
|
name?: string;
|
|
lang: string;
|
|
version: string;
|
|
headers?: boolean;
|
|
|
|
constructor(
|
|
transport: { version: string; lang: string },
|
|
opts: ConnectionOptions,
|
|
nonce?: string,
|
|
) {
|
|
this.protocol = 1;
|
|
this.version = transport.version;
|
|
this.lang = transport.lang;
|
|
this.echo = opts.noEcho ? false : undefined;
|
|
this.verbose = opts.verbose;
|
|
this.pedantic = opts.pedantic;
|
|
this.tls_required = opts.tls ? true : undefined;
|
|
this.name = opts.name;
|
|
|
|
const creds =
|
|
(opts && opts.authenticator ? opts.authenticator(nonce) : {}) || {};
|
|
extend(this, creds);
|
|
}
|
|
}
|
|
|
|
export interface Publisher {
|
|
publish(
|
|
subject: string,
|
|
data: Uint8Array,
|
|
options?: { reply?: string; headers?: MsgHdrs },
|
|
): void;
|
|
}
|
|
|
|
export class ProtocolHandler implements Dispatcher<ParserEvent> {
|
|
connected: boolean;
|
|
connectedOnce: boolean;
|
|
infoReceived: boolean;
|
|
info?: ServerInfo;
|
|
muxSubscriptions: MuxSubscription;
|
|
options: ConnectionOptions;
|
|
outbound: DataBuffer;
|
|
pongs: Array<Deferred<void>>;
|
|
subscriptions: Subscriptions;
|
|
transport!: Transport;
|
|
noMorePublishing: boolean;
|
|
connectError?: (err?: Error) => void;
|
|
publisher: Publisher;
|
|
_closed: boolean;
|
|
closed: Deferred<Error | void>;
|
|
listeners: QueuedIterator<Status>[];
|
|
heartbeats: Heartbeat;
|
|
parser: Parser;
|
|
outMsgs: number;
|
|
inMsgs: number;
|
|
outBytes: number;
|
|
inBytes: number;
|
|
pendingLimit: number;
|
|
lastError?: NatsError;
|
|
abortReconnect: boolean;
|
|
|
|
servers: Servers;
|
|
server!: ServerImpl;
|
|
|
|
constructor(options: ConnectionOptions, publisher: Publisher) {
|
|
this._closed = false;
|
|
this.connected = false;
|
|
this.connectedOnce = false;
|
|
this.infoReceived = false;
|
|
this.noMorePublishing = false;
|
|
this.abortReconnect = false;
|
|
this.listeners = [];
|
|
this.pendingLimit = FLUSH_THRESHOLD;
|
|
this.outMsgs = 0;
|
|
this.inMsgs = 0;
|
|
this.outBytes = 0;
|
|
this.inBytes = 0;
|
|
this.options = options;
|
|
this.publisher = publisher;
|
|
this.subscriptions = new Subscriptions();
|
|
this.muxSubscriptions = new MuxSubscription();
|
|
this.outbound = new DataBuffer();
|
|
this.pongs = [];
|
|
//@ts-ignore: options.pendingLimit is hidden
|
|
this.pendingLimit = options.pendingLimit || this.pendingLimit;
|
|
this.servers = new Servers(
|
|
!options.noRandomize,
|
|
//@ts-ignore: servers should be a list
|
|
options.servers,
|
|
);
|
|
this.closed = deferred<Error | void>();
|
|
this.parser = new Parser(this);
|
|
|
|
this.heartbeats = new Heartbeat(
|
|
this as PH,
|
|
this.options.pingInterval || DEFAULT_PING_INTERVAL,
|
|
this.options.maxPingOut || DEFAULT_MAX_PING_OUT,
|
|
);
|
|
}
|
|
|
|
resetOutbound(): void {
|
|
this.outbound.reset();
|
|
const pongs = this.pongs;
|
|
this.pongs = [];
|
|
// reject the pongs
|
|
pongs.forEach((p) => {
|
|
p.reject(NatsError.errorForCode(ErrorCode.DISCONNECT));
|
|
});
|
|
this.parser = new Parser(this);
|
|
this.infoReceived = false;
|
|
}
|
|
|
|
dispatchStatus(status: Status): void {
|
|
this.listeners.forEach((q) => {
|
|
q.push(status);
|
|
});
|
|
}
|
|
|
|
status(): AsyncIterable<Status> {
|
|
const iter = new QueuedIterator<Status>();
|
|
this.listeners.push(iter);
|
|
return iter;
|
|
}
|
|
|
|
private prepare(): Deferred<void> {
|
|
this.info = undefined;
|
|
this.resetOutbound();
|
|
|
|
const pong = deferred<void>();
|
|
this.pongs.unshift(pong);
|
|
|
|
this.connectError = (err?: Error) => {
|
|
pong.reject(err);
|
|
};
|
|
|
|
this.transport = newTransport();
|
|
this.transport.closed()
|
|
.then(async (err?) => {
|
|
this.connected = false;
|
|
if (!this.isClosed()) {
|
|
await this.disconnected(this.transport.closeError);
|
|
return;
|
|
}
|
|
});
|
|
|
|
return pong;
|
|
}
|
|
|
|
public disconnect(): void {
|
|
this.dispatchStatus({ type: DebugEvents.STALE_CONNECTION, data: "" });
|
|
this.transport.disconnect();
|
|
}
|
|
|
|
async disconnected(err?: Error): Promise<void> {
|
|
this.dispatchStatus(
|
|
{
|
|
type: Events.DISCONNECT,
|
|
data: this.servers.getCurrentServer().toString(),
|
|
},
|
|
);
|
|
if (this.options.reconnect) {
|
|
await this.dialLoop()
|
|
.then(() => {
|
|
this.dispatchStatus(
|
|
{
|
|
type: Events.RECONNECT,
|
|
data: this.servers.getCurrentServer().toString(),
|
|
},
|
|
);
|
|
})
|
|
.catch((err) => {
|
|
this._close(err);
|
|
});
|
|
} else {
|
|
await this._close();
|
|
}
|
|
}
|
|
|
|
async dial(srv: ServerImpl): Promise<void> {
|
|
const pong = this.prepare();
|
|
let timer;
|
|
try {
|
|
timer = timeout(this.options.timeout || 20000);
|
|
const cp = this.transport.connect(srv, this.options);
|
|
await Promise.race([cp, timer]);
|
|
(async () => {
|
|
try {
|
|
for await (const b of this.transport) {
|
|
this.parser.parse(b);
|
|
}
|
|
} catch (err) {
|
|
console.log("reader closed", err);
|
|
}
|
|
})().then();
|
|
} catch (err) {
|
|
pong.reject(err);
|
|
}
|
|
|
|
try {
|
|
await Promise.race([timer, pong]);
|
|
if (timer) {
|
|
timer.cancel();
|
|
}
|
|
this.connected = true;
|
|
this.connectError = undefined;
|
|
this.sendSubscriptions();
|
|
this.connectedOnce = true;
|
|
this.server.didConnect = true;
|
|
this.server.reconnects = 0;
|
|
this.flushPending();
|
|
this.heartbeats.start();
|
|
} catch (err) {
|
|
if (timer) {
|
|
timer.cancel();
|
|
}
|
|
await this.transport.close(err);
|
|
throw err;
|
|
}
|
|
}
|
|
|
|
async dialLoop(): Promise<void> {
|
|
let lastError: Error | undefined;
|
|
while (true) {
|
|
const wait = this.options.reconnectDelayHandler
|
|
? this.options.reconnectDelayHandler()
|
|
: DEFAULT_RECONNECT_TIME_WAIT;
|
|
let maxWait = wait;
|
|
const srv = this.selectServer();
|
|
if (!srv || this.abortReconnect) {
|
|
throw lastError || NatsError.errorForCode(ErrorCode.CONNECTION_REFUSED);
|
|
}
|
|
const now = Date.now();
|
|
if (srv.lastConnect === 0 || srv.lastConnect + wait <= now) {
|
|
srv.lastConnect = Date.now();
|
|
try {
|
|
this.dispatchStatus(
|
|
{ type: DebugEvents.RECONNECTING, data: srv.toString() },
|
|
);
|
|
await this.dial(srv);
|
|
break;
|
|
} catch (err) {
|
|
lastError = err;
|
|
if (!this.connectedOnce) {
|
|
if (this.options.waitOnFirstConnect) {
|
|
continue;
|
|
}
|
|
this.servers.removeCurrentServer();
|
|
}
|
|
srv.reconnects++;
|
|
const mra = this.options.maxReconnectAttempts || 0;
|
|
if (mra !== -1 && srv.reconnects >= mra) {
|
|
this.servers.removeCurrentServer();
|
|
}
|
|
}
|
|
} else {
|
|
maxWait = Math.min(maxWait, srv.lastConnect + wait - now);
|
|
await delay(maxWait);
|
|
}
|
|
}
|
|
}
|
|
|
|
public static async connect(
|
|
options: ConnectionOptions,
|
|
publisher: Publisher,
|
|
): Promise<ProtocolHandler> {
|
|
const h = new ProtocolHandler(options, publisher);
|
|
await h.dialLoop();
|
|
return h;
|
|
}
|
|
|
|
static toError(s: string) {
|
|
const t = s ? s.toLowerCase() : "";
|
|
if (t.indexOf("permissions violation") !== -1) {
|
|
return new NatsError(s, ErrorCode.PERMISSIONS_VIOLATION);
|
|
} else if (t.indexOf("authorization violation") !== -1) {
|
|
return new NatsError(s, ErrorCode.AUTHORIZATION_VIOLATION);
|
|
} else if (t.indexOf("user authentication expired") !== -1) {
|
|
return new NatsError(s, ErrorCode.AUTHENTICATION_EXPIRED);
|
|
} else {
|
|
return new NatsError(s, ErrorCode.NATS_PROTOCOL_ERR);
|
|
}
|
|
}
|
|
|
|
processMsg(msg: MsgArg, data: Uint8Array) {
|
|
this.inMsgs++;
|
|
this.inBytes += data.length;
|
|
if (!this.subscriptions.sidCounter) {
|
|
return;
|
|
}
|
|
|
|
const sub = this.subscriptions.get(msg.sid) as SubscriptionImpl;
|
|
if (!sub) {
|
|
return;
|
|
}
|
|
sub.received += 1;
|
|
|
|
if (sub.callback) {
|
|
sub.callback(null, new MsgImpl(msg, data, this));
|
|
}
|
|
|
|
if (sub.max !== undefined && sub.received >= sub.max) {
|
|
sub.unsubscribe();
|
|
}
|
|
}
|
|
|
|
async processError(m: Uint8Array) {
|
|
const s = fastDecoder(m);
|
|
const err = ProtocolHandler.toError(s);
|
|
const handled = this.subscriptions.handleError(err);
|
|
if (!handled) {
|
|
this.dispatchStatus({ type: Events.ERROR, data: err.code });
|
|
}
|
|
await this.handleError(err);
|
|
}
|
|
|
|
async handleError(err: NatsError) {
|
|
if (err.isAuthError()) {
|
|
this.handleAuthError(err);
|
|
}
|
|
if (err.isPermissionError() || err.isProtocolError()) {
|
|
await this._close(err);
|
|
}
|
|
this.lastError = err;
|
|
}
|
|
|
|
handleAuthError(err: NatsError) {
|
|
if (this.lastError && err.code === this.lastError.code) {
|
|
this.abortReconnect = true;
|
|
}
|
|
if (this.connectError) {
|
|
this.connectError(err);
|
|
} else {
|
|
this.disconnect();
|
|
}
|
|
}
|
|
|
|
processPing() {
|
|
this.transport.send(PONG_CMD);
|
|
}
|
|
|
|
processPong() {
|
|
const cb = this.pongs.shift();
|
|
if (cb) {
|
|
cb.resolve();
|
|
}
|
|
}
|
|
|
|
processInfo(m: Uint8Array) {
|
|
const info = JSON.parse(fastDecoder(m));
|
|
this.info = info;
|
|
const updates = this.options && this.options.ignoreClusterUpdates
|
|
? undefined
|
|
: this.servers.update(info);
|
|
if (!this.infoReceived) {
|
|
this.infoReceived = true;
|
|
if (this.transport.isEncrypted()) {
|
|
this.servers.updateTLSName();
|
|
}
|
|
// send connect
|
|
const { version, lang } = this.transport;
|
|
try {
|
|
const c = new Connect(
|
|
{ version, lang },
|
|
this.options,
|
|
info.nonce,
|
|
);
|
|
|
|
if (info.headers) {
|
|
c.headers = true;
|
|
c.no_responders = true;
|
|
}
|
|
const cs = JSON.stringify(c);
|
|
this.transport.send(
|
|
fastEncoder(`CONNECT ${cs}${CR_LF}`),
|
|
);
|
|
this.transport.send(PING_CMD);
|
|
} catch (err) {
|
|
this._close(
|
|
NatsError.errorForCode(ErrorCode.BAD_AUTHENTICATION, err),
|
|
);
|
|
}
|
|
}
|
|
if (updates) {
|
|
this.dispatchStatus({ type: Events.UPDATE, data: updates });
|
|
}
|
|
const ldm = info.ldm !== undefined ? info.ldm : false;
|
|
if (ldm) {
|
|
this.dispatchStatus(
|
|
{
|
|
type: Events.LDM,
|
|
data: this.servers.getCurrentServer().toString(),
|
|
},
|
|
);
|
|
}
|
|
}
|
|
|
|
push(e: ParserEvent): void {
|
|
switch (e.kind) {
|
|
case Kind.MSG: {
|
|
const { msg, data } = e;
|
|
this.processMsg(msg!, data!);
|
|
break;
|
|
}
|
|
case Kind.OK:
|
|
break;
|
|
case Kind.ERR:
|
|
this.processError(e.data!);
|
|
break;
|
|
case Kind.PING:
|
|
this.processPing();
|
|
break;
|
|
case Kind.PONG:
|
|
this.processPong();
|
|
break;
|
|
case Kind.INFO:
|
|
this.processInfo(e.data!);
|
|
break;
|
|
}
|
|
}
|
|
|
|
sendCommand(cmd: (string | Uint8Array), ...payloads: Uint8Array[]) {
|
|
const len = this.outbound.length();
|
|
let buf: Uint8Array;
|
|
if (typeof cmd === "string") {
|
|
buf = fastEncoder(cmd);
|
|
} else {
|
|
buf = cmd as Uint8Array;
|
|
}
|
|
this.outbound.fill(buf, ...payloads);
|
|
|
|
if (len === 0) {
|
|
setTimeout(() => {
|
|
this.flushPending();
|
|
});
|
|
} else if (this.outbound.size() >= this.pendingLimit) {
|
|
this.flushPending();
|
|
}
|
|
}
|
|
|
|
publish(
|
|
subject: string,
|
|
data: Uint8Array,
|
|
options?: PublishOptions,
|
|
) {
|
|
if (this.isClosed()) {
|
|
throw NatsError.errorForCode(ErrorCode.CONNECTION_CLOSED);
|
|
}
|
|
if (this.noMorePublishing) {
|
|
throw NatsError.errorForCode(ErrorCode.CONNECTION_DRAINING);
|
|
}
|
|
|
|
let len = data.length;
|
|
options = options || {};
|
|
options.reply = options.reply || "";
|
|
|
|
let headers = Empty;
|
|
let hlen = 0;
|
|
if (options.headers) {
|
|
if (this.info && !this.info.headers) {
|
|
throw new NatsError("headers", ErrorCode.SERVER_OPTION_NA);
|
|
}
|
|
const hdrs = options.headers as MsgHdrsImpl;
|
|
headers = hdrs.encode();
|
|
hlen = headers.length;
|
|
len = data.length + hlen;
|
|
}
|
|
|
|
if (this.info && len > this.info.max_payload) {
|
|
throw NatsError.errorForCode((ErrorCode.MAX_PAYLOAD_EXCEEDED));
|
|
}
|
|
this.outBytes += len;
|
|
this.outMsgs++;
|
|
|
|
let proto: string;
|
|
if (options.headers) {
|
|
if (options.reply) {
|
|
proto = `HPUB ${subject} ${options.reply} ${hlen} ${len}${CR_LF}`;
|
|
} else {
|
|
proto = `HPUB ${subject} ${hlen} ${len}\r\n`;
|
|
}
|
|
this.sendCommand(proto, headers, data, CRLF);
|
|
} else {
|
|
if (options.reply) {
|
|
proto = `PUB ${subject} ${options.reply} ${len}\r\n`;
|
|
} else {
|
|
proto = `PUB ${subject} ${len}\r\n`;
|
|
}
|
|
this.sendCommand(proto, data, CRLF);
|
|
}
|
|
}
|
|
|
|
request(r: Request): Request {
|
|
this.initMux();
|
|
this.muxSubscriptions.add(r);
|
|
return r;
|
|
}
|
|
|
|
subscribe(s: SubscriptionImpl): Subscription {
|
|
this.subscriptions.add(s);
|
|
if (s.queue) {
|
|
this.sendCommand(`SUB ${s.subject} ${s.queue} ${s.sid}\r\n`);
|
|
} else {
|
|
this.sendCommand(`SUB ${s.subject} ${s.sid}\r\n`);
|
|
}
|
|
if (s.max) {
|
|
this.unsubscribe(s, s.max);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
unsubscribe(s: SubscriptionImpl, max?: number) {
|
|
this.unsub(s, max);
|
|
if (s.max === undefined || s.received >= s.max) {
|
|
this.subscriptions.cancel(s);
|
|
}
|
|
}
|
|
|
|
unsub(s: SubscriptionImpl, max?: number) {
|
|
if (!s || this.isClosed()) {
|
|
return;
|
|
}
|
|
if (max) {
|
|
this.sendCommand(`UNSUB ${s.sid} ${max}${CR_LF}`);
|
|
} else {
|
|
this.sendCommand(`UNSUB ${s.sid}${CR_LF}`);
|
|
}
|
|
s.max = max;
|
|
}
|
|
|
|
flush(p?: Deferred<void>): Promise<void> {
|
|
if (!p) {
|
|
p = deferred<void>();
|
|
}
|
|
this.pongs.push(p);
|
|
this.sendCommand(PING_CMD);
|
|
return p;
|
|
}
|
|
|
|
sendSubscriptions() {
|
|
const cmds: string[] = [];
|
|
this.subscriptions.all().forEach((s) => {
|
|
const sub = s as SubscriptionImpl;
|
|
if (sub.queue) {
|
|
cmds.push(`SUB ${sub.subject} ${sub.queue} ${sub.sid}${CR_LF}`);
|
|
} else {
|
|
cmds.push(`SUB ${sub.subject} ${sub.sid}${CR_LF}`);
|
|
}
|
|
});
|
|
if (cmds.length) {
|
|
this.transport.send(fastEncoder(cmds.join("")));
|
|
}
|
|
}
|
|
|
|
private async _close(err?: Error): Promise<void> {
|
|
if (this._closed) {
|
|
return;
|
|
}
|
|
this.heartbeats.cancel();
|
|
if (this.connectError) {
|
|
this.connectError(err);
|
|
this.connectError = undefined;
|
|
}
|
|
this.muxSubscriptions.close();
|
|
this.subscriptions.close();
|
|
this.listeners.forEach((l) => {
|
|
l.stop();
|
|
});
|
|
this._closed = true;
|
|
await this.transport.close(err);
|
|
await this.closed.resolve(err);
|
|
}
|
|
|
|
close(): Promise<void> {
|
|
return this._close();
|
|
}
|
|
|
|
isClosed(): boolean {
|
|
return this._closed;
|
|
}
|
|
|
|
drain(): Promise<void> {
|
|
const subs = this.subscriptions.all();
|
|
const promises: Promise<void>[] = [];
|
|
subs.forEach((sub: Subscription) => {
|
|
promises.push(sub.drain());
|
|
});
|
|
return Promise.all(promises)
|
|
.then(async () => {
|
|
this.noMorePublishing = true;
|
|
await this.flush();
|
|
return this.close();
|
|
})
|
|
.catch(() => {
|
|
// cannot happen
|
|
});
|
|
}
|
|
|
|
private flushPending() {
|
|
if (!this.infoReceived || !this.connected) {
|
|
return;
|
|
}
|
|
|
|
if (this.outbound.size()) {
|
|
const d = this.outbound.drain();
|
|
this.transport.send(d);
|
|
}
|
|
}
|
|
|
|
private initMux(): void {
|
|
const mux = this.subscriptions.getMux();
|
|
if (!mux) {
|
|
const inbox = this.muxSubscriptions.init(
|
|
createInbox(this.options.inboxPrefix),
|
|
);
|
|
// dot is already part of mux
|
|
const sub = new SubscriptionImpl(this, `${inbox}*`);
|
|
sub.callback = this.muxSubscriptions.dispatcher();
|
|
this.subscriptions.setMux(sub);
|
|
this.subscribe(sub);
|
|
}
|
|
}
|
|
|
|
private selectServer(): ServerImpl | undefined {
|
|
const server = this.servers.selectServer();
|
|
if (server === undefined) {
|
|
return undefined;
|
|
}
|
|
// Place in client context.
|
|
this.server = server;
|
|
return this.server;
|
|
}
|
|
|
|
getServer(): ServerImpl | undefined {
|
|
return this.server;
|
|
}
|
|
}
|