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node-red-nodes/utility/daemon/daemon.js

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/**
* Copyright 2014 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 spawn = require('child_process').spawn;
function DaemonNode(n) {
RED.nodes.createNode(this,n);
this.cmd = n.command;
this.args = n.args.trim().split(" ") || [];
this.cr = n.cr;
this.op = n.op;
this.redo = n.redo;
this.running = false;
var node = this;
function inputlistener(msg) {
if (msg != null) {
if (!Buffer.isBuffer(msg.payload)) {
if (typeof msg.payload === "object") { msg.payload = JSON.stringify(msg.payload); }
if (typeof msg.payload !== "string") { msg.payload = msg.payload.toString(); }
if (node.cr === true) { msg.payload += "\n"; }
}
if (RED.settings.verbose) { node.log("inp: "+msg.payload); }
if (node.child !== null) { node.child.stdin.write(msg.payload); }
else { node.warn("Command not running"); }
}
}
function runit() {
node.child = spawn(node.cmd, node.args);
if (RED.settings.verbose) { node.log(node.cmd+" "+JSON.stringify(node.args)); }
node.status({fill:"green",shape:"dot",text:"running"});
node.running = true;
var line = "";
node.on("input", inputlistener);
node.child.stdout.on('data', function (data) {
if (node.op === "string") { data = data.toString(); }
if (node.op === "number") { data = Number(data); }
if (RED.settings.verbose) { node.log("out: "+data); }
if (node.op === "lines") {
line += data.toString();
var bits = line.split("\n");
while (bits.length > 1) {
node.send([{payload:bits.shift()},null,null]);
}
line = bits[0];
} else {
if (data && (data.length !== 0)) {
node.send([{payload:data},null,null]);
}
}
});
node.child.stderr.on('data', function (data) {
if (node.op === "string") { data = data.toString(); }
if (node.op === "number") { data = Number(data); }
if (RED.settings.verbose) { node.log("err: "+data); }
node.send([null,{payload:data},null]);
});
node.child.on('close', function (code) {
if (RED.settings.verbose) { node.log("ret: "+code); }
node.send([null,null,{payload:code}]);
node.child = null;
node.running = false;
node.status({fill:"red",shape:"ring",text:"stopped"});
});
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.status({fill:"grey",shape:"dot",text:"error"});
});
}
if (node.redo === true) {
var loop = setInterval( function() {
if (!node.running) {
node.removeListener('input', inputlistener);
node.warn("Restarting : " + node.cmd);
runit();
}
}, 10000); // Restart after 10 secs if required
}
node.on("close", function() {
if (node.child != null) { node.child.kill('SIGKILL'); }
if (RED.settings.verbose) { node.log(node.cmd+" stopped"); }
clearInterval(loop);
node.status({});
});
runit();
}
RED.nodes.registerType("daemon",DaemonNode);
}