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node-red-nodes/social/music/69-mpd.js

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/**
* Copyright 2013 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
var RED = require(process.env.NODE_RED_HOME+"/red/red");
var util = require("util");
var exec = require('child_process').exec;
var komponist = require('komponist');
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var mpc = null;
exec("which mpd",function(err,stdout,stderr) {
if (stdout.indexOf('mpd') == -1) {
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throw 'Error: Cannot find "mpd" command. Please install MPD.';
}
});
exec("netstat -an | grep LISTEN | grep 6600",function(err,stdout,stderr) {
if (stdout.indexOf('6600') == -1) {
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throw '[69-mpd.js] Error: MPD daemon not listening on port 6600. Please start MPD.';
}
komponist.createConnection(6600, 'localhost', function(err, client) {
if (err) node.error("MPD: Failed to connect to MPD server");
mpc = client;
});
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});
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function MPDOut(n) {
RED.nodes.createNode(this,n);
var node = this;
node.mpc = mpc;
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if (mpc != null) {
this.on("input", function(msg) {
if (msg != null) {
try {
//node.mpc.command(msg.payload);
node.mpc.command(msg.payload, msg.param, function(err, results) {
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if (err) { node.log("error: "+err); }
//else { console.log(results); }
});
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} catch (err) { node.log("error: "+err); }
}
});
node.mpc.on('error', function(err) {
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node.log("error: "+err);
});
}
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else { node.warn("MPD not running"); }
}
RED.nodes.registerType("mpd out",MPDOut);
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function MPDIn(n) {
RED.nodes.createNode(this,n);
var node = this;
node.mpc = mpc;
var oldMsg = "";
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if (mpc != null) {
getSong();
function getSong() {
node.mpc.currentsong(function(err, info) {
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if (err) node.log(err);
else {
var msg = {payload:{},topic:"music"};
msg.payload.Artist = info.Artist;
msg.payload.Album = info.Album;
msg.payload.Title = info.Title;
msg.payload.Genre = info.Genre;
msg.payload.Date = info.Date;
if (JSON.stringify(msg) != oldMsg) {
node.send(msg);
oldMsg = JSON.stringify(msg);
}
}
});
}
node.mpc.on('changed', function(system) {
getSong();
});
this.on("close", function() {
// node.mpc.command("stop");
});
}
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else { node.warn("MPD not running"); }
}
RED.nodes.registerType("mpd in",MPDIn);