mirror of
https://github.com/swc-project/swc.git
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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
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/*
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* Copyright 2018-2021 The NATS Authors
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import {
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ConnectionOptions,
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DebugEvents,
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DEFAULT_MAX_PING_OUT,
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DEFAULT_PING_INTERVAL,
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DEFAULT_RECONNECT_TIME_WAIT,
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Empty,
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Events,
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PublishOptions,
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ServerInfo,
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Status,
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Subscription,
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} from "./types.ts";
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import { newTransport, Transport } from "./transport.ts";
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import { ErrorCode, NatsError } from "./error.ts";
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import {
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CR_LF,
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CRLF,
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Deferred,
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deferred,
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delay,
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extend,
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timeout,
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} from "./util.ts";
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import { nuid } from "./nuid.ts";
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import { DataBuffer } from "./databuffer.ts";
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import { ServerImpl, Servers } from "./servers.ts";
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import { Dispatcher, QueuedIterator } from "./queued_iterator.ts";
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import type { MsgHdrs, MsgHdrsImpl } from "./headers.ts";
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import { SubscriptionImpl } from "./subscription.ts";
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import { Subscriptions } from "./subscriptions.ts";
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import { MuxSubscription } from "./muxsubscription.ts";
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import type { Request } from "./request.ts";
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import { Heartbeat, PH } from "./heartbeats.ts";
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import { Kind, MsgArg, Parser, ParserEvent } from "./parser.ts";
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import { MsgImpl } from "./msg.ts";
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import { fastDecoder, fastEncoder } from "./encoders.ts";
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const FLUSH_THRESHOLD = 1024 * 32;
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export const INFO = /^INFO\s+([^\r\n]+)\r\n/i;
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export function createInbox(prefix: string = ""): string {
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prefix = prefix || "_INBOX";
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if (typeof prefix !== "string") {
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throw (new Error("prefix must be a string"));
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}
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return `${prefix}.${nuid.next()}`;
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}
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const PONG_CMD = fastEncoder("PONG\r\n");
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const PING_CMD = fastEncoder("PING\r\n");
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export class Connect {
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echo?: boolean;
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no_responders?: boolean;
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protocol: number;
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verbose?: boolean;
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pedantic?: boolean;
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jwt?: string;
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nkey?: string;
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sig?: string;
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user?: string;
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pass?: string;
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auth_token?: string;
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tls_required?: boolean;
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name?: string;
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lang: string;
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version: string;
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headers?: boolean;
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constructor(
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transport: { version: string; lang: string },
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opts: ConnectionOptions,
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nonce?: string,
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) {
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this.protocol = 1;
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this.version = transport.version;
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this.lang = transport.lang;
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this.echo = opts.noEcho ? false : undefined;
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this.verbose = opts.verbose;
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this.pedantic = opts.pedantic;
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this.tls_required = opts.tls ? true : undefined;
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this.name = opts.name;
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const creds =
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(opts && opts.authenticator ? opts.authenticator(nonce) : {}) || {};
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extend(this, creds);
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}
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}
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export interface Publisher {
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publish(
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subject: string,
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data: Uint8Array,
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options?: { reply?: string; headers?: MsgHdrs },
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): void;
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}
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export class ProtocolHandler implements Dispatcher<ParserEvent> {
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connected: boolean;
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connectedOnce: boolean;
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infoReceived: boolean;
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info?: ServerInfo;
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muxSubscriptions: MuxSubscription;
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options: ConnectionOptions;
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outbound: DataBuffer;
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pongs: Array<Deferred<void>>;
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subscriptions: Subscriptions;
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transport!: Transport;
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noMorePublishing: boolean;
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connectError?: (err?: Error) => void;
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publisher: Publisher;
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_closed: boolean;
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closed: Deferred<Error | void>;
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listeners: QueuedIterator<Status>[];
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heartbeats: Heartbeat;
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parser: Parser;
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outMsgs: number;
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inMsgs: number;
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outBytes: number;
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inBytes: number;
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pendingLimit: number;
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lastError?: NatsError;
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abortReconnect: boolean;
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servers: Servers;
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server!: ServerImpl;
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constructor(options: ConnectionOptions, publisher: Publisher) {
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this._closed = false;
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this.connected = false;
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this.connectedOnce = false;
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this.infoReceived = false;
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this.noMorePublishing = false;
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this.abortReconnect = false;
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this.listeners = [];
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this.pendingLimit = FLUSH_THRESHOLD;
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this.outMsgs = 0;
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this.inMsgs = 0;
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this.outBytes = 0;
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this.inBytes = 0;
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this.options = options;
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this.publisher = publisher;
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this.subscriptions = new Subscriptions();
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this.muxSubscriptions = new MuxSubscription();
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this.outbound = new DataBuffer();
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this.pongs = [];
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//@ts-ignore: options.pendingLimit is hidden
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this.pendingLimit = options.pendingLimit || this.pendingLimit;
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this.servers = new Servers(
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!options.noRandomize,
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//@ts-ignore: servers should be a list
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options.servers,
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);
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this.closed = deferred<Error | void>();
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this.parser = new Parser(this);
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this.heartbeats = new Heartbeat(
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this as PH,
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this.options.pingInterval || DEFAULT_PING_INTERVAL,
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this.options.maxPingOut || DEFAULT_MAX_PING_OUT,
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);
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}
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resetOutbound(): void {
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this.outbound.reset();
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const pongs = this.pongs;
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this.pongs = [];
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// reject the pongs
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pongs.forEach((p) => {
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p.reject(NatsError.errorForCode(ErrorCode.DISCONNECT));
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});
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this.parser = new Parser(this);
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this.infoReceived = false;
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}
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dispatchStatus(status: Status): void {
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this.listeners.forEach((q) => {
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q.push(status);
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});
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}
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status(): AsyncIterable<Status> {
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const iter = new QueuedIterator<Status>();
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this.listeners.push(iter);
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return iter;
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}
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private prepare(): Deferred<void> {
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this.info = undefined;
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this.resetOutbound();
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const pong = deferred<void>();
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this.pongs.unshift(pong);
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this.connectError = (err?: Error) => {
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pong.reject(err);
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};
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this.transport = newTransport();
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this.transport.closed()
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.then(async (err?) => {
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this.connected = false;
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if (!this.isClosed()) {
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await this.disconnected(this.transport.closeError);
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return;
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}
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});
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return pong;
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}
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public disconnect(): void {
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this.dispatchStatus({ type: DebugEvents.STALE_CONNECTION, data: "" });
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this.transport.disconnect();
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}
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async disconnected(err?: Error): Promise<void> {
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this.dispatchStatus(
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{
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type: Events.DISCONNECT,
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data: this.servers.getCurrentServer().toString(),
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},
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);
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if (this.options.reconnect) {
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await this.dialLoop()
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.then(() => {
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this.dispatchStatus(
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{
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type: Events.RECONNECT,
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data: this.servers.getCurrentServer().toString(),
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},
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);
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})
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.catch((err) => {
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this._close(err);
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});
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} else {
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await this._close();
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}
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}
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async dial(srv: ServerImpl): Promise<void> {
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const pong = this.prepare();
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let timer;
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try {
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timer = timeout(this.options.timeout || 20000);
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const cp = this.transport.connect(srv, this.options);
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await Promise.race([cp, timer]);
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(async () => {
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try {
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for await (const b of this.transport) {
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this.parser.parse(b);
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}
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} catch (err) {
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console.log("reader closed", err);
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}
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})().then();
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} catch (err) {
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pong.reject(err);
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}
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try {
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await Promise.race([timer, pong]);
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if (timer) {
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timer.cancel();
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}
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this.connected = true;
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this.connectError = undefined;
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this.sendSubscriptions();
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this.connectedOnce = true;
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this.server.didConnect = true;
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this.server.reconnects = 0;
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this.flushPending();
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this.heartbeats.start();
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} catch (err) {
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if (timer) {
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timer.cancel();
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}
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await this.transport.close(err);
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throw err;
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}
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}
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async dialLoop(): Promise<void> {
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let lastError: Error | undefined;
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while (true) {
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const wait = this.options.reconnectDelayHandler
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? this.options.reconnectDelayHandler()
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: DEFAULT_RECONNECT_TIME_WAIT;
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let maxWait = wait;
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const srv = this.selectServer();
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if (!srv || this.abortReconnect) {
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throw lastError || NatsError.errorForCode(ErrorCode.CONNECTION_REFUSED);
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}
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const now = Date.now();
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if (srv.lastConnect === 0 || srv.lastConnect + wait <= now) {
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srv.lastConnect = Date.now();
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try {
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this.dispatchStatus(
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{ type: DebugEvents.RECONNECTING, data: srv.toString() },
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);
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await this.dial(srv);
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break;
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} catch (err) {
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lastError = err;
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if (!this.connectedOnce) {
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if (this.options.waitOnFirstConnect) {
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continue;
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}
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this.servers.removeCurrentServer();
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}
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srv.reconnects++;
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const mra = this.options.maxReconnectAttempts || 0;
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if (mra !== -1 && srv.reconnects >= mra) {
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this.servers.removeCurrentServer();
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}
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}
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} else {
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maxWait = Math.min(maxWait, srv.lastConnect + wait - now);
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await delay(maxWait);
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}
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}
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}
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public static async connect(
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options: ConnectionOptions,
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publisher: Publisher,
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): Promise<ProtocolHandler> {
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const h = new ProtocolHandler(options, publisher);
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await h.dialLoop();
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return h;
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}
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static toError(s: string) {
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const t = s ? s.toLowerCase() : "";
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if (t.indexOf("permissions violation") !== -1) {
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return new NatsError(s, ErrorCode.PERMISSIONS_VIOLATION);
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} else if (t.indexOf("authorization violation") !== -1) {
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return new NatsError(s, ErrorCode.AUTHORIZATION_VIOLATION);
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} else if (t.indexOf("user authentication expired") !== -1) {
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return new NatsError(s, ErrorCode.AUTHENTICATION_EXPIRED);
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} else {
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return new NatsError(s, ErrorCode.NATS_PROTOCOL_ERR);
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}
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}
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processMsg(msg: MsgArg, data: Uint8Array) {
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this.inMsgs++;
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this.inBytes += data.length;
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if (!this.subscriptions.sidCounter) {
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return;
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}
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const sub = this.subscriptions.get(msg.sid) as SubscriptionImpl;
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if (!sub) {
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return;
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}
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sub.received += 1;
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if (sub.callback) {
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sub.callback(null, new MsgImpl(msg, data, this));
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}
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if (sub.max !== undefined && sub.received >= sub.max) {
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sub.unsubscribe();
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}
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}
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async processError(m: Uint8Array) {
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const s = fastDecoder(m);
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const err = ProtocolHandler.toError(s);
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const handled = this.subscriptions.handleError(err);
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if (!handled) {
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this.dispatchStatus({ type: Events.ERROR, data: err.code });
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}
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await this.handleError(err);
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}
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async handleError(err: NatsError) {
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if (err.isAuthError()) {
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this.handleAuthError(err);
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}
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if (err.isPermissionError() || err.isProtocolError()) {
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await this._close(err);
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}
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this.lastError = err;
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}
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handleAuthError(err: NatsError) {
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if (this.lastError && err.code === this.lastError.code) {
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this.abortReconnect = true;
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}
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if (this.connectError) {
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this.connectError(err);
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} else {
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this.disconnect();
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}
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}
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processPing() {
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this.transport.send(PONG_CMD);
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}
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processPong() {
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const cb = this.pongs.shift();
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if (cb) {
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cb.resolve();
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}
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}
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processInfo(m: Uint8Array) {
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const info = JSON.parse(fastDecoder(m));
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this.info = info;
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const updates = this.options && this.options.ignoreClusterUpdates
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? undefined
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: this.servers.update(info);
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if (!this.infoReceived) {
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this.infoReceived = true;
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if (this.transport.isEncrypted()) {
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this.servers.updateTLSName();
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}
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// send connect
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const { version, lang } = this.transport;
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try {
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const c = new Connect(
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{ version, lang },
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this.options,
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info.nonce,
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);
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if (info.headers) {
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c.headers = true;
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c.no_responders = true;
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}
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const cs = JSON.stringify(c);
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this.transport.send(
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fastEncoder(`CONNECT ${cs}${CR_LF}`),
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);
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this.transport.send(PING_CMD);
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} catch (err) {
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this._close(
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NatsError.errorForCode(ErrorCode.BAD_AUTHENTICATION, err),
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);
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}
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}
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if (updates) {
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this.dispatchStatus({ type: Events.UPDATE, data: updates });
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}
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const ldm = info.ldm !== undefined ? info.ldm : false;
|
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if (ldm) {
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this.dispatchStatus(
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{
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type: Events.LDM,
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data: this.servers.getCurrentServer().toString(),
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},
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);
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}
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}
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push(e: ParserEvent): void {
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switch (e.kind) {
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case Kind.MSG: {
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const { msg, data } = e;
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this.processMsg(msg!, data!);
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break;
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}
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case Kind.OK:
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break;
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case Kind.ERR:
|
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this.processError(e.data!);
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break;
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case Kind.PING:
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this.processPing();
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break;
|
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case Kind.PONG:
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this.processPong();
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break;
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case Kind.INFO:
|
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this.processInfo(e.data!);
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break;
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}
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}
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sendCommand(cmd: (string | Uint8Array), ...payloads: Uint8Array[]) {
|
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const len = this.outbound.length();
|
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let buf: Uint8Array;
|
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if (typeof cmd === "string") {
|
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buf = fastEncoder(cmd);
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} else {
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buf = cmd as Uint8Array;
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}
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this.outbound.fill(buf, ...payloads);
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|
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if (len === 0) {
|
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setTimeout(() => {
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this.flushPending();
|
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});
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} else if (this.outbound.size() >= this.pendingLimit) {
|
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this.flushPending();
|
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}
|
|
}
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|
|
publish(
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subject: string,
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|
data: Uint8Array,
|
|
options?: PublishOptions,
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|
) {
|
|
if (this.isClosed()) {
|
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throw NatsError.errorForCode(ErrorCode.CONNECTION_CLOSED);
|
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}
|
|
if (this.noMorePublishing) {
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throw NatsError.errorForCode(ErrorCode.CONNECTION_DRAINING);
|
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}
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let len = data.length;
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options = options || {};
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options.reply = options.reply || "";
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let headers = Empty;
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let hlen = 0;
|
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if (options.headers) {
|
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if (this.info && !this.info.headers) {
|
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throw new NatsError("headers", ErrorCode.SERVER_OPTION_NA);
|
|
}
|
|
const hdrs = options.headers as MsgHdrsImpl;
|
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headers = hdrs.encode();
|
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hlen = headers.length;
|
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len = data.length + hlen;
|
|
}
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|
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if (this.info && len > this.info.max_payload) {
|
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throw NatsError.errorForCode((ErrorCode.MAX_PAYLOAD_EXCEEDED));
|
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}
|
|
this.outBytes += len;
|
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this.outMsgs++;
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|
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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;
|
|
}
|
|
}
|