automate-powerplug-stereoanlage

.env

HUE_HOST=192.168.XX.XX
HUE_USER=iglksjflXXXXXXXXX
LIGHT_NUMBER=00

automate-powerplug-stereoanlage.service

[Unit]
Description=Automate powerplug when sound is playing

[Service]
TimeoutSec=0
EnvironmentFile=/home/pi/automate-powerplug-stereoanlage/.env

ExecStart=/usr/local/bin/node /home/pi/automate-powerplug-stereoanlage/index.js

[Install]
WantedBy=multi-user.target

index.js

const qfgets = require('qfgets');
const glob = require('glob');
const IDLE = 0;
const PLAYING = 1;
var status = {};
var timeoutObj = {};
var config = require('./utils').config,
hue = require("node-hue-api"),
HueApi = hue.HueApi,
lightState = hue.lightState;

var displayResults = function(result) {
  console.log(JSON.stringify(result, null, 2));
};

var displayError = function(err) {
  console.error(err);
};

var api = new HueApi(config.HUE_HOST, config.HUE_USER);
// https://stackoverflow.com/questions/28400727/from-node-js-which-is-faster-shell-grep-or-fs-readfile
function grepWithFs(filename, regexp, done) {
  let fp = new qfgets(filename, "r");
  let count = 0;
  function loop() {
    for (i=0; i<1; i++) {
      line = fp.fgets();
      if (line && line.match(regexp)) count++;
    }
    if (!fp.feof()) setImmediate(loop);
    else done(count);
  }
  loop();
}


glob('/proc/asound/card*/*p/*/status', function (err, files) {
  setInterval(() => {
    files.map(file => {
      if (isNaN(status[file])) {
        status[file] = IDLE;
        timeoutObj[file] = 0;
      }
      
      grepWithFs(file, 'RUNNING', function(count) {
        if (count === 0 && status[file] === PLAYING) {
          console.log('power-off maybe', file);
          status[file] = IDLE;
          timeoutObj[file] = setTimeout(function () {
            console.log('power-off', status, file);
            api.setLightState(config.LIGHT_NUMBER, {on: false})
            .then(displayResults)
            .fail(displayError)
            .done();
          }, 30000);
          return;
        }
        if (count > 0 && status[file] === IDLE) {
          status[file] = PLAYING;
          clearTimeout(timeoutObj[file]);
          console.log('power on playing', status[file], file);
          api.setLightState(config.LIGHT_NUMBER, {on: true})
          .then(displayResults)
          .fail(displayError)
          .done();
        }
      });
    });
  }, 2500);
});

package.json

{
  "name": "automate-powerplug-stereoanlage",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "glob": "^7.1.2",
    "nconf": "^0.10.0",
    "node-hue-api": "^2.4.2",
    "qfgets": "^1.1.1"
  }
}

utils.js

var nconf = require('nconf');
var pkg = require('./package.json');
var config = nconf
  .env()
  .argv()
  .defaults(pkg.appConfig)
  .get();

module.exports = {
  config: config
};