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import * as cluster from 'cluster';
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import * as net from 'net';
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import * as NodeRtmpSession from '../node_modules/node-media-server/node_rtmp_session';
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import * as logger from '../node_modules/node-media-server/node_core_logger';
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import * as dirty from "dirty";
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import { mkdir, fstat, access } from "fs";
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import * as strf from "strftime";
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import * as ctx from '../node_modules/node-media-server/node_core_ctx';
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import * as db from "./database";
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import {config} from "./config";
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import * as isPortAvailable from "is-port-available";
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const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
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const { exec, execFile } = require('child_process');
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const keystore = dirty();
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const num_processes = require('os').cpus().length;
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const workerMap = {};
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if (cluster.isMaster) {
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//master logic
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//store workers in here
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var workers = [];
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// Helper function for spawning worker at index 'i'.
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var spawn = function(i) {
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workers[i] = cluster.fork();
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workers[i].on('message', (msg) => {
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handleMsgMaster(msg, i)
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});
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// Restart worker on exit
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workers[i].on('exit', function(code, signal) {
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console.log('[RTMP Cluster MASTER] Respawning Worker', i);
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spawn(i);
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});
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};
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// Spawn initial workers
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for (var i = 0; i < num_processes; i++) {
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spawn(i);
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}
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var nextWorker: number = 0;
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//TODO assign incoming connections correctly
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var server = net.createServer({ pauseOnConnect: true }, function(connection) {
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if(nextWorker >= workers.length) nextWorker = 0;
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var worker = workers[nextWorker];
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worker.send('rtmp-session:connection', connection); //send connection to worker
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}).listen(config['rtmp']['port']);
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console.log('[RTMP Cluster MASTER] Master Ready.');
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} else {
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//worker logic
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//we need our own database pool since we can't share memory anyone else
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db.initRTMPCluster();
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const rtmpcfg = {
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logType: 0,
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rtmp: Object.assign({port: 1936}, config['rtmp'])
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};
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//find a unique port to listen on
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getPort().then((wPort) => {
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// creating the rtmp server
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var serv = net.createServer((socket) => {
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let session = new NodeRtmpSession(rtmpcfg, socket);
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session.run();
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}).listen(wPort);
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logger.setLogType(0);
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// RTMP Server Logic
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newRTMPListener('postPublish', (id, StreamPath, args) =>{
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console.log(`[RTMP Cluster WORKER ${process.pid}] Publish Hook for stream: ${id}`);
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let session = getRTMPSession(id);
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let app: string = StreamPath.split("/")[1];
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let key: string = StreamPath.split("/")[2];
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//disallow urls not formatted exactly right
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if (StreamPath.split("/").length !== 3 || key.includes(' ')){
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console.log(`[RTMP Cluster WORKER ${process.pid}] Malformed URL, closing connection for stream: ${id}`);
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session.reject();
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return false;
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}
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if(app !== config['media']['privateEndpoint']){
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//app isn't at public endpoint if we've reached this point
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console.log(`[RTMP Cluster WORKER ${process.pid}] Wrong endpoint, rejecting stream: ${id}`);
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session.reject();
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return false;
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}
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//if the url is formatted correctly and the user is streaming to the correct private endpoint
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//grab the username from the database and redirect the stream there if the key is valid
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//otherwise kill the session
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db.query('select username,record_flag from users where stream_key='+db.raw.escape(key)+' limit 1').then(async (results) => {
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if(results[0]){
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//transcode to mpd after making sure directory exists
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keystore[results[0].username] = key;
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mkdir(config['http']['directory']+'/'+config['media']['publicEndpoint']+'/'+results[0].username, { recursive : true }, ()=>{;});
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while(true){
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if(session.audioCodec !== 0 && session.videoCodec !== 0){
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transCommand(results[0].username, key, wPort).then((r) => {
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execFile(config['media']['ffmpeg'], r, {maxBuffer: Infinity}, (err, stdout, stderr) => {
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/*console.log(err);
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console.log(stdout);
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console.log(stderr);*/
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});
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});
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break;
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}
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await sleep(300);
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}
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if(results[0].record_flag && config['media']['record']){
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console.log(`[RTMP Cluster WORKER ${process.pid}] Initiating recording for stream: ${id}`);
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mkdir(config['http']['directory']+'/'+config['media']['publicEndpoint']+'/'+results[0].username, { recursive : true }, (err) => {
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if (err) throw err;
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execFile(config['media']['ffmpeg'], ['-loglevel', 'fatal', '-i', 'rtmp://127.0.0.1:'+wPort+'/'+config['media']['privateEndpoint']+'/'+key, '-vcodec', 'copy', '-acodec', 'copy', config['http']['directory']+'/'+config['media']['publicEndpoint']+'/'+results[0].username+'/'+strf('%d%b%Y-%H%M')+'.mp4'], {
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detached : true,
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stdio : 'inherit',
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maxBuffer: Infinity
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}).unref();
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//spawn an ffmpeg process to record the stream, then detach it completely
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//ffmpeg can then (probably) finalize the recording if satyr crashes mid-stream
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});
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}
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else {
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console.log(`[RTMP Cluster WORKER ${process.pid}] Skipping recording for stream: ${id}`);
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}
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db.query('update user_meta set live=true where username=\''+results[0].username+'\' limit 1');
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db.query('SELECT twitch_key,enabled from twitch_mirror where username='+db.raw.escape(results[0].username)+' limit 1').then(async (tm) => {
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if(!tm[0]['enabled'] || !config['twitch_mirror']['enabled'] || !config['twitch_mirror']['ingest']) return;
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console.log('[NodeMediaServer] Mirroring to twitch for stream:',id)
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execFile(config['media']['ffmpeg'], ['-loglevel', 'fatal', '-i', 'rtmp://127.0.0.1:'+wPort+'/'+config['media']['privateEndpoint']+'/'+key, '-vcodec', 'copy', '-acodec', 'copy', '-f', 'flv', config['twitch_mirror']['ingest']+tm[0]['twitch_key']], {
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detached: true,
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stdio : 'inherit',
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maxBuffer: Infinity
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}).unref();
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});
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console.log('[NodeMediaServer] Stream key ok for stream:',id);
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console.log(`[RTMP Cluster WORKER ${process.pid}] Stream key ok for stream: ${id}`);
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//notify master process that we're handling the stream for this user
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process.send({type: 'handle-publish', name:results[0].username});
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}
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else{
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console.log(`[RTMP Cluster WORKER ${process.pid}] Invalid stream key for stream: ${id}`);
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session.reject();
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}
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});
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});
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newRTMPListener('donePublish', (id, StreamPath, args) => {
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let app: string = StreamPath.split("/")[1];
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let key: string = StreamPath.split("/")[2];
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if(app === config['media']['privateEndpoint']) {
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db.query('update user_meta,users set user_meta.live=false where users.stream_key='+db.raw.escape(key));
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db.query('select username from users where stream_key='+db.raw.escape(key)+' limit 1').then(async (results) => {
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if(results[0]) keystore.rm(results[0].username);
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//notify master process that we're no longer handling the stream for this user
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process.send({type: 'handle-publish-done', name:results[0].username});
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});
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}
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});
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newRTMPListener('prePlay', (id, StreamPath, args) => {
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let session = getRTMPSession(id);
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let app: string = StreamPath.split("/")[1];
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let key: string = StreamPath.split("/")[2];
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//correctly formatted urls again
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if (StreamPath.split("/").length !== 3){
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console.log("[NodeMediaServer] Malformed URL, closing connection for stream:",id);
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session.reject();
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return false;
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}
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//localhost can play from whatever endpoint
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//other clients must use private endpoint
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if(app !== config['media']['publicEndpoint'] && !session.isLocal) {
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console.log("[NodeMediaServer] Non-local Play from private endpoint, rejecting client:",id);
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session.reject();
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return false;
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}
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//rewrite playpath to private endpoint serverside
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//(hopefully)
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if(app === config['media']['publicEndpoint']) {
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if(keystore[key]){
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session.playStreamPath = '/'+config['media']['privateEndpoint']+'/'+keystore[key];
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return true;
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}
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//here the client is asking for a valid stream that we don't have
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//so we are going to ask the master process for it
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else session.reject();
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}
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});
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//recieve messages from master
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process.on('message', function(message, connection) {
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if (message === 'rtmp-session:connection') {
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// Emulate a connection event on the server by emitting the
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// event with the connection the master sent us.
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serv.emit('connection', connection);
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connection.resume();
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return;
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}
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if(message['type'] === 'stream-request:h') {
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if(!message['available'])
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getRTMPSession(message['id']).reject();
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}
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});
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console.log(`[RTMP Cluster WORKER ${process.pid}] Worker Ready.`);
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});
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}
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function newRTMPListener(eventName, listener) {
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ctx.nodeEvent.on(eventName, listener);
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}
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function getRTMPSession(id) {
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return ctx.sessions.get(id);
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}
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async function getPort(): Promise<number>{
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let port = 1936+process.pid;
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while(true){
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let i=0;
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if(await isPortAvailable(port+i)){
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port += i;
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break;
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}
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i++;
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}
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return port;
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}
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async function transCommand(user: string, key: string, wPort): Promise<string[]>{
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let args: string[] = ['-loglevel', 'fatal', '-y'];
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if(config['transcode']['inputflags'] !== null && config['transcode']['inputflags'] !== "") args = args.concat(config['transcode']['inputflags'].split(" "));
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args = args.concat(['-i', 'rtmp://127.0.0.1:'+wPort+'/'+config['media']['privateEndpoint']+'/'+key, '-movflags', '+faststart']);
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if(config['transcode']['adaptive']===true && config['transcode']['variants'] > 1) {
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for(let i=0;i<config['transcode']['variants'];i++){
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args = args.concat(['-map', '0:2']);
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}
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args = args.concat(['-map', '0:1', '-c:a', 'aac', '-c:v:0', 'libx264']);
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for(let i=1;i<config['transcode']['variants'];i++){
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args = args.concat(['-c:v:'+i, 'libx264',]);
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}
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for(let i=1;i<config['transcode']['variants'];i++){
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let crf: number = Math.floor(18 + (i * 8)) > 51 ? 51 : Math.floor(18 + (i * 7));
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args = args.concat(['-crf:'+i, ''+crf]);
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}
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for(let i=1;i<config['transcode']['variants'];i++){
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let bv: number = Math.floor((5000 / config['transcode']['variants']) * (config['transcode']['variants'] - i));
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args = args.concat(['-b:v:'+i, ''+bv]);
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}
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}
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else {
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args = args.concat(['-c:a', 'aac', '-c:v', 'libx264']);
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}
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args = args.concat(['-preset', 'veryfast', '-tune', 'zerolatency']);
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//if(config['transcode']['format'] === 'dash')
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args = args.concat(['-remove_at_exit', '1', '-seg_duration', '1', '-window_size', '30']);
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if(config['transcode']['outputflags'] !== null && config['transcode']['outputflags'] !== "") args = args.concat(config['transcode']['outputflags'].split(" "));
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args = args.concat(['-f', 'dash', config['http']['directory']+'/'+config['media']['publicEndpoint']+'/'+user+'/index.mpd']);
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//else if(config['transcode']['format'] === 'hls')
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//args = args.concat(['-remove_at_exit', '1', '-hls_time', '1', '-hls_list_size', '30', '-f', 'hls', config['http']['directory']+'/'+config['media']['publicEndpoint']+'/'+user+'/index.m3u8']);
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return args;
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}
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function handleMsgMaster(msg, index) {
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if(msg['type'] === 'handle-publish'){
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workerMap[msg['name']] = index;
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nextWorker++;
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if(nextWorker >= workers.length) nextWorker = 0;
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}
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if(msg['type'] === 'handle-publish-done'){
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workerMap[msg['name']] = undefined;
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}
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if(msg['type'] === 'stream-request:h'){
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if(workerMap[msg['key']] !== undefined){
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workers[index].send({type: 'stream-request:h', id: msg['id'], key: msg['key'], available: true});
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}
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else {
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workers[index].send({type: 'stream-request:h', id: msg['id'], key: msg['key'], available: false});
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}
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}
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}
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