74 lines
1.7 KiB
JavaScript
74 lines
1.7 KiB
JavaScript
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const spawn = require('child_process').spawn;
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const EventEmitter = require('events').EventEmitter;
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const TAGREADER = 'tagreader';
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const MP3PLAYER = 'mpg321';
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const child_processes = new Map();
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function launchChild(name, command) {
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var cmd = command[0],
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args = command.slice(1);
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return spawn(cmd, args);
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}
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function setupEmitter(name, emitter, child) {
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exports[name] = emitter;
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child.on('error', function(err) {
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emitter.emit('process_error', err);
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});
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child.on('close', function(code, signal) {
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emitter.emit('close', code, signal);
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});
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child.stdout.on('data', (data) => {
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var s = data.toString(), lines = s.split(/\n/g);
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for (var i = 0, l = lines.length; i < l; i++) {
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emitter.emit('message', lines[i]);
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}
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});
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child.stderr.on('data', (data) => {
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emitter.emit('error', data);
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});
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return emitter;
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}
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exports.init = function(config) {
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// Set up tag reader
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var tagreader = launchChild(TAGREADER, config.tag_reader);
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var tagreader_emitter = new EventEmitter();
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setupEmitter(TAGREADER, tagreader_emitter, tagreader);
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child_processes.set(TAGREADER, tagreader);
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exports.tagreader = tagreader_emitter;
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// set up mp3 player
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var mp3player = launchChild(MP3PLAYER, config.mpg321);
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var mp3player_emitter = new EventEmitter();
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setupEmitter(MP3PLAYER, mp3player_emitter, mp3player);
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child_processes.set(MP3PLAYER, mp3player);
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exports.mp3player = mp3player_emitter;
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};
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exports.exitHandler = function(options, err) {
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console.log('[player] closing children');
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if (err) console.log(err.stack);
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child_processes.forEach((p) => {
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p.kill();
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});
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if (options.exit) {
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process.exit();
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}
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};
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// vim:set ts=2 sw=2 et:
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