pi-rfid-jukebox/player.js

"use strict";

const config = require('./config.json')

const library = require('./jukebox/library');

const ScriptRunner = require('./jukebox/scripts')(config);

const express = require('express');
const morgan = require('morgan');
const handlebars = require('express-handlebars');
const multer = require('multer');
const uuid = require('uuid/v4');

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, config.media_path)
  },
  filename: function (req, file, cb) {
    var track_uuid = uuid();
    cb(null, track_uuid)
  }
});

var upload = multer({
  storage: storage,
});

const { createLogger, format, transports } = require('winston');

const { throttle } = require('throttle-debounce');

var logger = createLogger({
  transports: [
    new transports.Console()
  ]
});

logger.level = config.debug ? 'debug' : 'info';

const MediaPlayer = require('./jukebox/media-player')(config, logger);
const TagReader = require('./jukebox/tag-reader')(config, logger);
const play_log = require('./jukebox/library/play-log');

const sqlite3 = require('sqlite3');
var db = new sqlite3.Database(config.db);

const MediaLibrarySqliteBackend = require('./jukebox/library/sqlite-backend')(config, db, logger);
const MediaLibrary = new library.Library(config, MediaLibrarySqliteBackend);

const PlayLog = new play_log.PlayLog();

var app = express();
var server = require('http').createServer();

const WebSocket = require('ws');
const WebSocketServer = WebSocket.Server;
var wss = new WebSocketServer({server: server});

function exitHandler(options, err) {
  logger.debug('closing child tasks');
  if (err) logger.debug(err.stack);

  // FIXME When do we actually need to call this? Adding these seems
  // to have fixed a problem with orphaned children, but not we get
  // two sets of "closing child tasks" messages when we shut down.
  TagReader.kill();
  MediaPlayer.kill();

  if (options.exit) {
    process.exit();
  }
};

process.on('exit', exitHandler.bind(null));
process.on('SIGINT', exitHandler.bind(null, {exit:true}));
process.on('SIGUSR2', exitHandler.bind(null, {exit:true}));

const throttledTag = throttle(config.global_throttle, true, tag => {
  ScriptRunner.find(tag).then((fulfilled) => {
    if (false === fulfilled) {
      MediaLibrary.find(tag)
    }
  }).catch(err => {
    logger.error("got an error handling the tag: " + err);
  });
});

TagReader.on('message', tag => {
  if (tag == 'E1' || tag == 'E2') {
    logger.debug("tagreader had rfid read error", { tag: tag });
    return;
  }
  logger.debug("got tag from tagreader", { tag: tag });
  throttledTag(tag);
});

if (config.debug) {
  MediaPlayer.on('message', line => {
    logger.debug("mediaplayer sent message", { line: line });
  });
}

MediaPlayer.on('command', tag => {
  PlayLog.updateLog(tag);
});

var hbs = handlebars.create({
  extname: ".hbs",
});

MediaLibrary.on('action', MediaPlayer.handleTag.bind(MediaPlayer));

app.engine(".hbs", hbs.engine);

app.set('view engine', '.hbs');
app.set('views', __dirname + '/views');

app.use(morgan('dev'))
app.use(express.json())
app.use(express.static(__dirname + '/static'))

PlayLog.on('update', tag => {
  app.render("log", { layout: false, play_log: PlayLog.getLog(), }, (err, html) => {
    var data = {
      html: html,
      tag: tag.tag
    };

    wss.broadcast(JSON.stringify(data));
  });
});

app.get('/', function(req, res, next) {
  res.render('index', {
    last_tag: PlayLog.getLastTag(),
    config: config,
    play_log: PlayLog.getLog(),
  });
});

app.get('/api/tags', function(req, res, next) {
  db.all("SELECT tags.tag, count(library.tag) tag_count FROM (SELECT DISTINCT tag FROM tags) tags LEFT JOIN library ON tags.tag = library.tag GROUP BY tags.tag", (err, rows) => {
    res.send(rows);
  });
});

app.patch('/api/tracks/:track', function(req, res, next) {
  var track_uuid = req.params.track,
    label = req.body.label,
    tag = req.body.tag;

  db.run("UPDATE library SET label = ?, tag = ? WHERE uuid = ?", label, tag, track_uuid, err => {
    db.get("SELECT * FROM library WHERE uuid = ?", track_uuid, (err, row) => {
      res.send(row);
    });
  });
});

app.get('/api/tracks', function(req, res, next) {
  db.all("SELECT * FROM library ORDER BY label ASC", (err, rows) => {
    res.send(rows);
  });
});

app.post('/api/tracks', upload.single('track'), function(req, res, next) {
  db.run("INSERT INTO library (label, uuid) VALUES (?, ?)", req.file.originalname, req.file.filename, err => {
    res.redirect('/library');
  });
});

app.get('/library', function(req, res, next) {
  res.render('library', {
    title: 'Library',
  });
});

wss.broadcast = function broadcast(data) {
  wss.clients.forEach(function each(client) {
    if (client.readyState === WebSocket.OPEN) {
      client.send(data);
    }
  });
};

wss.on('connection', function(ws) {
  logger.info('websocket client connected');
  ws.on('close', function() {
    logger.info('websocket client disconnected');
  });
});

server.on('request', app);

server.listen(config.port, function() {
  logger.info('express listening on http://localhost:' + config.port)
})

// vim:ts=2 sw=2 et: