mirror of
https://github.com/ad1217/PrinterStatus
synced 2024-11-21 06:53:48 -05:00
server: Actively check for loss of connection to octoprint websocket
Periodically `ping` the server, and check for returning `pong`s
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parent
51d3cbf41e
commit
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@ -13,6 +13,10 @@ import * as octoprint from '../types/octoprint';
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const PORT = process.env.PORT || 1234;
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const PING_TIME = 10000;
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type Timeout = ReturnType<typeof setTimeout>;
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type configuration = {
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printers: {
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[key: string]: { address: string; apikey: string };
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@ -69,9 +73,6 @@ class PrinterStatus {
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webcamURL?: URL;
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name?: string;
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session_key?: string;
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websocket?: WebSocket;
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lastStatus?: messages.ExtendedMessage;
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constructor(slug: string, address: string, apikey: string) {
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@ -79,42 +80,43 @@ class PrinterStatus {
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this.address = address;
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this.apikey = apikey;
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// async init
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this.try_connect_websocket();
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}
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try_connect_websocket() {
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this.connect_websocket().catch((e) => {
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console.error('Failed to initialize "${this.slug}"');
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throw e;
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console.error(
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`Failed to connect to "${this.slug}", attempting reconnection in 5 seconds`
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);
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console.error(e);
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setTimeout(() => this.try_connect_websocket(), 5000);
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});
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}
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async connect_websocket() {
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// initial setup
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if (!this.session_key) {
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try {
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const settings = await this.api_get('settings');
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this.webcamURL = new URL(settings.webcam.streamUrl, this.address);
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this.name = settings.appearance.name;
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const settings = await this.api_get('settings');
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this.webcamURL = new URL(settings.webcam.streamUrl, this.address);
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this.name = settings.appearance.name;
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// do passive login to get a session key from the API key
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const login: octoprint.LoginResponse = await this.api_post('login', {
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passive: 'true',
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});
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this.session_key = login.name + ':' + login.session;
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} catch {
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console.log(
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`Failed to connect to "${this.slug}" attempting reconnection in 5 seconds`
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);
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setTimeout(() => this.connect_websocket(), 5000);
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return;
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}
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}
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// do passive login to get a session key from the API key
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const login: octoprint.LoginResponse = await this.api_post('login', {
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passive: 'true',
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});
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const session_key = login.name + ':' + login.session;
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let pingSender: ReturnType<typeof setInterval>;
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let pongTimeout: Timeout;
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const url = new URL('/sockjs/websocket', this.address);
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url.protocol = 'ws';
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this.websocket = new WebSocket(url.toString());
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this.websocket
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let websocket = new WebSocket(url.toString());
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websocket
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.on('open', () => {
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pingSender = setInterval(() => websocket.ping(), PING_TIME);
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pongTimeout = this.heartbeat(websocket, pongTimeout);
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console.log(`Connected to "${this.slug}"`);
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this.websocket!.send(JSON.stringify({ auth: this.session_key }));
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websocket.send(JSON.stringify({ auth: session_key }));
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})
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.on('message', (data: WebSocket.Data) => {
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const event: octoprint.Message = JSON.parse(data as string);
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@ -130,14 +132,28 @@ class PrinterStatus {
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this.lastStatus = ext_event;
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}
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})
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.on('pong', () => {
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pongTimeout = this.heartbeat(websocket, pongTimeout);
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})
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.on('close', () => {
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clearInterval(pingSender);
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clearTimeout(pongTimeout);
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console.log(
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`Lost connection to "${this.slug}" attempting reconnection in 5 seconds`
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`Lost connection to "${this.slug}", attempting reconnection in 5 seconds`
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);
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setTimeout(() => this.connect_websocket(), 5000);
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setTimeout(() => this.try_connect_websocket(), 5000);
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});
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}
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heartbeat(websocket: WebSocket, pongTimeout: Timeout): Timeout {
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clearTimeout(pongTimeout);
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return setTimeout(() => {
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console.log(`Missed 2 heartbeats for "${this.slug}", disconnecting`);
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websocket.terminate();
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}, PING_TIME * 2);
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}
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async api_get(endpoint: string): Promise<any> {
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const r = await fetch(new URL('/api/' + endpoint, this.address), {
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headers: { 'X-Api-Key': this.apikey },
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