mirror of
https://github.com/hensm/fx_cast.git
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Add snap support (#60)
* Initial app daemon implementation * Pass script path to child bridge processes * Change WebSocket server port * Fix error sending message whilst WebSocket connection is closing * Initial ext daemon connection implementation
This commit is contained in:
Matt Hensman
301
app/src/main.ts
Executable file → Normal file
301
app/src/main.ts
Executable file → Normal file
@@ -1,299 +1,18 @@
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import dnssd from "dnssd";
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"use strict";
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import child_process from "child_process";
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import events from "events";
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import fs from "fs";
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import http from "http";
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import mime from "mime-types";
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import path from "path";
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import Media from "./Media";
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import MediaServer from "./MediaServer";
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import Session from "./Session";
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import StatusListener from "./StatusListener";
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import * as transforms from "./transforms";
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import { MediaStatus, ReceiverStatus } from "./castTypes";
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import { Message } from "./types";
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import { __applicationName
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, __applicationVersion } from "../package.json";
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import minimist from "minimist";
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// Increase listener limit
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events.EventEmitter.defaultMaxListeners = 50;
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const browser = new dnssd.Browser(dnssd.tcp("googlecast"));
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// Local media server
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let mediaServer: MediaServer;
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process.on("SIGTERM", () => {
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if (mediaServer) {
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mediaServer.stop();
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const argv = minimist(process.argv.slice(2), {
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boolean: [ "daemon" ]
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, default: {
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daemon: false
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}
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});
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// stdin -> stdout
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process.stdin
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.pipe(transforms.decode)
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.pipe(transforms.response(handleMessage))
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.pipe(transforms.encode)
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.pipe(process.stdout);
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/**
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* Encode and send a message to the extension.
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*/
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function sendMessage (message: object) {
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try {
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transforms.encode.write(message);
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} catch (err) {
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console.error("Failed to encode message");
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}
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}
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interface InitializeOptions {
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shouldWatchStatus?: boolean;
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}
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// Existing counterpart Media/Session objects
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const existingSessions: Map<string, Session> = new Map();
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const existingMedia: Map<string, Media> = new Map();
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let receiverSelectorApp: child_process.ChildProcess;
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/**
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* Handle incoming messages from the extension and forward
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* them to the appropriate handlers.
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*
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* Initializes the counterpart objects and is responsible
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* for managing existing ones.
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*/
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async function handleMessage (message: Message) {
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if (message.subject.startsWith("bridge:/media/")) {
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if (existingMedia.has(message._id)) {
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// Forward message to instance message handler
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existingMedia.get(message._id).messageHandler(message);
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} else {
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if (message.subject.endsWith("/initialize")) {
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// Get Session object media belongs to
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const parentSession = existingSessions.get(
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message.data._internalSessionId);
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// Create Media
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existingMedia.set(message._id, new Media(
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message.data.sessionId
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, message.data.mediaSessionId
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, message._id
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, parentSession
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, sendMessage));
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}
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}
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return;
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}
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if (message.subject.startsWith("bridge:/session/")) {
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if (existingSessions.has(message._id)) {
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// Forward message to instance message handler
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existingSessions.get(message._id).messageHandler(message);
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} else {
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if (message.subject.endsWith("/initialize")) {
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// Create Session
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existingSessions.set(message._id, new Session(
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message.data.address
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, message.data.port
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, message.data.appId
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, message.data.sessionId
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, message._id
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, sendMessage));
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}
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}
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return;
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}
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switch (message.subject) {
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case "bridge:/getInfo": {
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const extensionVersion = message.data;
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return __applicationVersion;
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}
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case "bridge:/initialize": {
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const options: InitializeOptions = message.data;
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initialize(options);
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break;
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}
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case "bridge:/receiverSelector/open": {
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const receiverSelectorData = message.data;
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if (process.platform !== "darwin") {
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console.error("Invalid platform for native selector.");
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process.exit(1);
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}
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if (!receiverSelectorData) {
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console.error("Missing native selector data.");
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process.exit(1);
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} else {
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try {
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JSON.parse(receiverSelectorData);
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} catch (err) {
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console.error("Invalid native selector data.");
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}
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}
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receiverSelectorApp = child_process.spawn(
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path.join(process.cwd(), "selector")
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, [ receiverSelectorData ]);
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receiverSelectorApp.stdout.setEncoding("utf8");
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receiverSelectorApp.stdout.on("data", data => {
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sendMessage({
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subject: "main:/receiverSelector/selected"
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, data: JSON.parse(data)
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});
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});
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receiverSelectorApp.addListener("error", err => {
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sendMessage({
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subject: "main:/receiverSelector/error"
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, data: err.message
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});
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});
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receiverSelectorApp.on("close", () => {
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sendMessage({
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subject: "main:/receiverSelector/close"
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});
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});
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break;
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}
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case "bridge:/receiverSelector/close": {
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receiverSelectorApp.kill();
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break;
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}
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case "bridge:/mediaServer/start": {
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const { filePath, port } = message.data;
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mediaServer = new MediaServer(filePath, port);
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mediaServer.start();
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mediaServer.on("started", () => {
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sendMessage({
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subject: "mediaCast:/mediaServer/started"
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});
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});
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mediaServer.on("stopped", () => {
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sendMessage({
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subject: "mediaCast:/mediaServer/stopped"
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});
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});
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break;
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}
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case "bridge:/mediaServer/stop": {
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if (mediaServer) {
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mediaServer.stop();
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}
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break;
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}
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}
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}
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function initialize (options: InitializeOptions) {
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if (options.shouldWatchStatus) {
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browser.on("serviceUp", onStatusBrowserServiceUp);
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browser.on("serviceDown", onStatusBrowserServiceDown);
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}
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browser.on("serviceUp", onBrowserServiceUp);
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browser.on("servicedown", onBrowserServiceDown);
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browser.start();
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function onBrowserServiceUp (service: dnssd.Service) {
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sendMessage({
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subject: "shim:/serviceUp"
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, data: {
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host: service.addresses[0]
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, port: service.port
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, id: service.txt.id
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, friendlyName: service.txt.fn
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}
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});
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}
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function onBrowserServiceDown (service: dnssd.Service) {
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sendMessage({
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subject: "shim:/serviceDown"
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, data: {
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id: service.txt.id
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}
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});
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}
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// Receiver status listeners for status mode
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const statusListeners = new Map<string, StatusListener>();
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function onStatusBrowserServiceUp (service: dnssd.Service) {
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const { id } = service.txt;
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const listener = new StatusListener(
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service.addresses[0]
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, service.port);
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listener.on("receiverStatus", (status: ReceiverStatus) => {
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const receiverStatusMessage: any = {
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subject: "receiverStatus"
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, data: {
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id
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, status: {
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volume: {
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level: status.volume.level
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, muted: status.volume.muted
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}
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}
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}
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};
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if ("applications" in status) {
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const application = status.applications[0];
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receiverStatusMessage.data.status.application = {
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displayName: application.displayName
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, isIdleScreen: application.isIdleScreen
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, statusText: application.statusText
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};
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}
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sendMessage(receiverStatusMessage);
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});
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statusListeners.set(id, listener);
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}
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function onStatusBrowserServiceDown (service: dnssd.Service) {
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const { id } = service.txt;
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if (statusListeners.has(id)) {
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statusListeners.get(id).deregister();
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statusListeners.delete(id);
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}
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}
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if (argv.daemon) {
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import("./daemon");
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} else {
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import("./bridge");
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}
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