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node-red-nodes/hardware/LEDborg/78-ledborg.js

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/**
* Copyright 2013,2015 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.
**/
module.exports = function(RED) {
"use strict";
var util = require("util");
//var exec = require('child_process').exec;
var spawn = require('child_process').spawn;
var fs = require('fs');
var LedBorgInUse = false;
var gpioCommand = __dirname+'/nrgpio';
if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
//util.log("Info : Ignoring Raspberry LEDborg specific node.");
throw "Info : Ignoring Raspberry LEDborg specific node.";
}
if (!fs.existsSync("/usr/share/doc/python-rpi.gpio")) {
util.log("[rpi-ledborg] Info : Can't find RPi.GPIO python library.");
throw "Warning : Can't find RPi.GPIO python library.";
}
if ( !(1 & parseInt ((fs.statSync(gpioCommand).mode & parseInt ("777", 8)).toString (8)[0]) )) {
util.log("[rpi-ledborg] Error : "+gpioCommand+" needs to be executable.");
throw "Error : nrgpio must to be executable.";
}
// GPIO pins 11 (R), 13 (G), 15 (B).
function LedBorgNode(n) {
RED.nodes.createNode(this,n);
if (LedBorgInUse) { this.error("LEDborg node already in use - you may only have one."); }
else { LedBorgInUse = true; }
this.pin = n.pin;
this.set = n.set || false;
this.level = n.level || 0;
this.out = n.out || "out";
var node = this;
var p1 = /^[0-2][0-2][0-2]$/
var p2 = /^\#[A-Fa-f0-9]{6}$/
var p3 = /^\d+,\d+,\d+$/
function inputlistener(msg) {
var rgb = "000";
if (p1.test(msg.payload)) {
rgb = msg.payload;
rgb = Number(rgb[0])*50+","+Number(rgb[1])*50+","+Number(rgb[2])*50;
}
else if (p2.test(msg.payload)) {
var r = Math.floor(parseInt(msg.payload.slice(1,3),16)*100/256).toString();
var g = Math.floor(parseInt(msg.payload.slice(3,5),16)*100/256).toString();
var b = Math.floor(parseInt(msg.payload.slice(5),16)*100/256).toString();
rgb = r+","+g+","+b;
}
else if (p3.test(msg.payload)) {
var c = msg.payload.split(",");
var r1 = Math.floor(parseInt(c[0])*100/256).toString();
var g1 = Math.floor(parseInt(c[1])*100/256).toString();
var b1 = Math.floor(parseInt(c[2])*100/256).toString();
rgb = r1+","+g1+","+b1;
}
else {
// you can add fancy colours by name here if you want...
// these are the @cheerlight ones.
var colors = {"red":"200","green":"020","blue":"002","cyan":"022","white":"222","pink":"201","oldlace":"221",
"warmwhite":"221","purple":"101","magenta":"202","yellow":"220","amber":"220","orange":"210","black":"000","off":"000"}
if (msg.payload.toLowerCase() in colors) {
rgb = colors[msg.payload.toLowerCase()];
rgb = Number(rgb[0])*50+","+Number(rgb[1])*50+","+Number(rgb[2])*50;
}
else {
node.warn("Invalid LedBorg colour code");
}
}
if (RED.settings.verbose) { node.log("out: "+msg.payload); }
if (node.child !== null) { node.child.stdin.write(rgb+"\n"); }
else { node.warn("Command not running"); }
node.status({fill:"green",shape:"dot",text:msg.payload});
}
node.child = spawn(gpioCommand, ["borg","11"]);
node.running = true;
node.status({fill:"green",shape:"dot",text:"OK"});
node.on("input", inputlistener);
node.child.stdout.on('data', function (data) {
if (RED.settings.verbose) { node.log("out: "+data+" :"); }
});
node.child.stderr.on('data', function (data) {
if (RED.settings.verbose) { node.log("err: "+data+" :"); }
});
node.child.on('close', function () {
node.child = null;
node.running = false;
node.status({fill:"red",shape:"circle",text:""});
if (RED.settings.verbose) { node.log("closed"); }
if (node.done) { node.done(); }
});
node.child.on('error', function (err) {
if (err.errno === "ENOENT") { node.warn('Command not found'); }
else if (err.errno === "EACCES") { node.warn('Command not executable'); }
else { node.log('error: ' + err); }
});
node.on("close", function(done) {
LedBorgInUse = false;
node.status({fill:"red",shape:"circle",text:""});
if (node.child != null) {
node.done = done;
node.child.stdin.write(" close 11");
node.child.kill('SIGKILL');
}
else { done(); }
});
}
RED.nodes.registerType("ledborg",LedBorgNode);
}