signal-desktop/ts/textsecure/WebsocketResources.ts

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// Copyright 2020 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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/* eslint-disable max-classes-per-file */
/*
* WebSocket-Resources
*
* Create a request-response interface over websockets using the
* WebSocket-Resources sub-protocol[1].
*
* var client = new WebSocketResource(socket, function(request) {
* request.respond(200, 'OK');
* });
*
* const { response, status } = await client.sendRequest({
* verb: 'PUT',
* path: '/v1/messages',
* headers: ['content-type:application/json'],
* body: Buffer.from('{ some: "json" }'),
* });
*
* 1. https://github.com/signalapp/WebSocket-Resources
*
*/
import type { connection as WebSocket, IMessage } from 'websocket';
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import Long from 'long';
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import pTimeout from 'p-timeout';
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import type { EventHandler } from './EventTarget';
import EventTarget from './EventTarget';
import * as durations from '../util/durations';
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import { dropNull } from '../util/dropNull';
import { isOlderThan } from '../util/timestamp';
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import { strictAssert } from '../util/assert';
import * as Errors from '../types/errors';
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import { SignalService as Proto } from '../protobuf';
import * as log from '../logging/log';
import * as Timers from '../Timers';
const THIRTY_SECONDS = 30 * durations.SECOND;
const MAX_MESSAGE_SIZE = 256 * 1024;
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export class IncomingWebSocketRequest {
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private readonly id: Long;
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public readonly verb: string;
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public readonly path: string;
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public readonly body: Uint8Array | undefined;
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public readonly headers: ReadonlyArray<string>;
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constructor(
request: Proto.IWebSocketRequestMessage,
private readonly sendBytes: (bytes: Buffer) => void
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) {
strictAssert(request.id, 'request without id');
strictAssert(request.verb, 'request without verb');
strictAssert(request.path, 'request without path');
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this.id = request.id;
this.verb = request.verb;
this.path = request.path;
this.body = dropNull(request.body);
this.headers = request.headers || [];
}
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public respond(status: number, message: string): void {
const bytes = Proto.WebSocketMessage.encode({
type: Proto.WebSocketMessage.Type.RESPONSE,
response: { id: this.id, message, status },
}).finish();
this.sendBytes(Buffer.from(bytes));
}
}
export type SendRequestOptions = Readonly<{
verb: string;
path: string;
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body?: Uint8Array;
timeout?: number;
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headers?: ReadonlyArray<string>;
}>;
export type SendRequestResult = Readonly<{
status: number;
message: string;
response?: Uint8Array;
headers: ReadonlyArray<string>;
}>;
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export type WebSocketResourceOptions = {
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name: string;
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handleRequest?: (request: IncomingWebSocketRequest) => void;
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keepalive?: KeepAliveOptionsType;
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};
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export class CloseEvent extends Event {
constructor(public readonly code: number, public readonly reason: string) {
super('close');
}
}
export default class WebSocketResource extends EventTarget {
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private outgoingId = Long.fromNumber(1, true);
private closed = false;
private readonly outgoingMap = new Map<
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string,
(result: SendRequestResult) => void
>();
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private readonly boundOnMessage: (message: IMessage) => void;
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private activeRequests = new Set<IncomingWebSocketRequest | string>();
private shuttingDown = false;
private shutdownTimer?: Timers.Timeout;
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private readonly logId: string;
public readonly localPort: number | undefined;
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// Public for tests
public readonly keepalive?: KeepAlive;
constructor(
private readonly socket: WebSocket,
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private readonly options: WebSocketResourceOptions
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) {
super();
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this.logId = `WebSocketResource(${options.name})`;
this.localPort = socket.socket.localPort;
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this.boundOnMessage = this.onMessage.bind(this);
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socket.on('message', this.boundOnMessage);
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if (options.keepalive) {
const keepalive = new KeepAlive(
this,
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options.name,
options.keepalive ?? {}
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);
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this.keepalive = keepalive;
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keepalive.reset();
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socket.on('close', () => this.keepalive?.stop());
socket.on('error', (error: Error) => {
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log.warn(`${this.logId}: WebSocket error`, Errors.toLogFormat(error));
});
}
socket.on('close', (code, reason) => {
this.closed = true;
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log.warn(`${this.logId}: Socket closed`);
this.dispatchEvent(new CloseEvent(code, reason || 'normal'));
});
this.addEventListener('close', () => this.onClose());
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}
public override addEventListener(
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name: 'close',
handler: (ev: CloseEvent) => void
): void;
public override addEventListener(name: string, handler: EventHandler): void {
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return super.addEventListener(name, handler);
}
public async sendRequest(
options: SendRequestOptions
): Promise<SendRequestResult> {
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const id = this.outgoingId;
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const idString = id.toString();
strictAssert(!this.outgoingMap.has(idString), 'Duplicate outgoing request');
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// Note that this automatically wraps
this.outgoingId = this.outgoingId.add(1);
const bytes = Proto.WebSocketMessage.encode({
type: Proto.WebSocketMessage.Type.REQUEST,
request: {
verb: options.verb,
path: options.path,
body: options.body,
headers: options.headers ? options.headers.slice() : undefined,
id,
},
}).finish();
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strictAssert(
bytes.length <= MAX_MESSAGE_SIZE,
'WebSocket request byte size exceeded'
);
strictAssert(!this.shuttingDown, 'Cannot send request, shutting down');
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this.addActive(idString);
const promise = new Promise<SendRequestResult>((resolve, reject) => {
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const sentAt = Date.now();
let timedOut = false;
let timer = options.timeout
? Timers.setTimeout(() => {
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timedOut = true;
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this.removeActive(idString);
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reject(new Error(`Request timed out; id: [${idString}]`));
}, options.timeout)
: undefined;
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this.outgoingMap.set(idString, result => {
if (timer !== undefined) {
Timers.clearTimeout(timer);
timer = undefined;
}
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if (timedOut) {
log.warn(
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`${this.logId}: Response received after timeout; ` +
`id: [${idString}], path: [${options.path}], ` +
`response time: ${Date.now() - sentAt}ms`
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);
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} else {
// Reset keepalive when an on-time response arrives
this.keepalive?.reset();
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}
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this.removeActive(idString);
resolve(result);
});
});
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this.socket.sendBytes(Buffer.from(bytes));
return promise;
}
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public forceKeepAlive(): void {
if (!this.keepalive) {
return;
}
void this.keepalive.send();
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}
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public close(code = 3000, reason?: string): void {
if (this.closed) {
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log.info(`${this.logId}.close: Already closed! ${code}/${reason}`);
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return;
}
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log.info(`${this.logId}.close(${code})`);
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if (this.keepalive) {
this.keepalive.stop();
}
this.socket.close(code, reason);
this.socket.removeListener('message', this.boundOnMessage);
// On linux the socket can wait a long time to emit its close event if we've
// lost the internet connection. On the order of minutes. This speeds that
// process up.
Timers.setTimeout(() => {
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if (this.closed) {
return;
}
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log.warn(`${this.logId}.close: Dispatching our own socket close event`);
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this.dispatchEvent(new CloseEvent(code, reason || 'normal'));
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}, 5 * durations.SECOND);
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}
public shutdown(): void {
if (this.closed) {
return;
}
if (this.activeRequests.size === 0) {
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log.info(`${this.logId}.shutdown: no active requests, closing`);
this.close(3000, 'Shutdown');
return;
}
this.shuttingDown = true;
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log.info(`${this.logId}.shutdown: shutting down`);
this.shutdownTimer = Timers.setTimeout(() => {
if (this.closed) {
return;
}
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log.warn(`${this.logId}.shutdown: Failed to shutdown gracefully`);
this.close(3000, 'Shutdown');
}, THIRTY_SECONDS);
}
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private onMessage({ type, binaryData }: IMessage): void {
if (type !== 'binary' || !binaryData) {
throw new Error(`Unsupported websocket message type: ${type}`);
}
const message = Proto.WebSocketMessage.decode(binaryData);
if (
message.type === Proto.WebSocketMessage.Type.REQUEST &&
message.request
) {
const handleRequest =
this.options.handleRequest ||
(request => request.respond(404, 'Not found'));
const incomingRequest = new IncomingWebSocketRequest(
message.request,
(bytes: Buffer): void => {
this.removeActive(incomingRequest);
strictAssert(
bytes.length <= MAX_MESSAGE_SIZE,
'WebSocket response byte size exceeded'
);
this.socket.sendBytes(bytes);
}
);
if (this.shuttingDown) {
incomingRequest.respond(-1, 'Shutting down');
return;
}
this.addActive(incomingRequest);
handleRequest(incomingRequest);
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} else if (
message.type === Proto.WebSocketMessage.Type.RESPONSE &&
message.response
) {
const { response } = message;
strictAssert(response.id, 'response without id');
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const responseIdString = response.id.toString();
const resolve = this.outgoingMap.get(responseIdString);
this.outgoingMap.delete(responseIdString);
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if (!resolve) {
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throw new Error(`Received response for unknown request ${response.id}`);
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}
resolve({
status: response.status ?? -1,
message: response.message ?? '',
response: dropNull(response.body),
headers: response.headers ?? [],
});
}
}
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private onClose(): void {
const outgoing = new Map(this.outgoingMap);
this.outgoingMap.clear();
for (const resolve of outgoing.values()) {
resolve({
status: -1,
message: 'Connection closed',
response: undefined,
headers: [],
});
}
}
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private addActive(request: IncomingWebSocketRequest | string): void {
this.activeRequests.add(request);
}
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private removeActive(request: IncomingWebSocketRequest | string): void {
if (!this.activeRequests.has(request)) {
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log.warn(`${this.logId}.removeActive: removing unknown request`);
return;
}
this.activeRequests.delete(request);
if (this.activeRequests.size !== 0) {
return;
}
if (!this.shuttingDown) {
return;
}
if (this.shutdownTimer) {
Timers.clearTimeout(this.shutdownTimer);
this.shutdownTimer = undefined;
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}
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log.info(`${this.logId}.removeActive: shutdown complete`);
this.close(3000, 'Shutdown');
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}
}
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export type KeepAliveOptionsType = {
path?: string;
};
// 30 seconds + 5 seconds for closing the socket above.
const KEEPALIVE_INTERVAL_MS = 30 * durations.SECOND;
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// If the machine was in suspended mode for more than 5 minutes - trigger
// immediate disconnect.
const STALE_THRESHOLD_MS = 5 * durations.MINUTE;
// If we don't receive a response to keepalive request within 10 seconds -
// close the socket.
const KEEPALIVE_TIMEOUT_MS = 10 * durations.SECOND;
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const LOG_KEEPALIVE_AFTER_MS = 500;
class KeepAlive {
private keepAliveTimer: Timers.Timeout | undefined;
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private path: string;
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private wsr: WebSocketResource;
private lastAliveAt: number = Date.now();
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private logId: string;
constructor(
websocketResource: WebSocketResource,
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name: string,
opts: KeepAliveOptionsType = {}
) {
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this.logId = `WebSocketResources.KeepAlive(${name})`;
if (websocketResource instanceof WebSocketResource) {
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this.path = opts.path ?? '/';
this.wsr = websocketResource;
} else {
throw new TypeError('KeepAlive expected a WebSocketResource');
}
}
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public stop(): void {
this.clearTimers();
}
public async send(): Promise<void> {
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this.clearTimers();
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const isStale = isOlderThan(this.lastAliveAt, STALE_THRESHOLD_MS);
if (isStale) {
log.info(`${this.logId}.send: disconnecting due to stale state`);
this.wsr.close(
3001,
`Last keepalive request was too far in the past: ${this.lastAliveAt}`
);
return;
}
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log.info(`${this.logId}.send: Sending a keepalive message`);
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const sentAt = Date.now();
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try {
const { status } = await pTimeout(
this.wsr.sendRequest({
verb: 'GET',
path: this.path,
}),
KEEPALIVE_TIMEOUT_MS
);
if (status < 200 || status >= 300) {
log.warn(`${this.logId}.send: keepalive response status ${status}`);
this.wsr.close(3001, `keepalive response with ${status} code`);
return;
}
} catch (error) {
this.wsr.close(3001, 'No response to keepalive request');
return;
}
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const responseTime = Date.now() - sentAt;
if (responseTime > LOG_KEEPALIVE_AFTER_MS) {
log.warn(
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`${this.logId}.send: delayed response to keepalive request, ` +
`response time: ${responseTime}ms`
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);
}
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// Successful response on time
this.reset();
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}
public reset(): void {
this.lastAliveAt = Date.now();
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this.clearTimers();
this.keepAliveTimer = Timers.setTimeout(
() => this.send(),
KEEPALIVE_INTERVAL_MS
);
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}
private clearTimers(): void {
if (this.keepAliveTimer) {
Timers.clearTimeout(this.keepAliveTimer);
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this.keepAliveTimer = undefined;
}
}
}