107 lines
4.1 KiB
JavaScript
107 lines
4.1 KiB
JavaScript
/**
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* Copyright 2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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module.exports = function(RED) {
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"use strict";
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var spawn = require('child_process').spawn;
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function DaemonNode(n) {
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RED.nodes.createNode(this,n);
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this.cmd = n.command;
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this.args = n.args.split(" ") || [];
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this.cr = n.cr;
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this.op = n.op;
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this.redo = n.redo;
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this.running = false;
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var node = this;
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function inputlistener(msg) {
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if (msg != null) {
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if (!Buffer.isBuffer(msg.payload)) {
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if (typeof msg.payload === "object") { msg.payload = JSON.stringify(msg.payload); }
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if (typeof msg.payload !== "string") { msg.payload = msg.payload.toString(); }
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if (node.cr === true) { msg.payload += "\n"; }
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}
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if (RED.settings.verbose) { node.log("inp: "+msg.payload); }
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if (node.child !== null) { node.child.stdin.write(msg.payload); }
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else { node.warn("Command not running"); }
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}
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}
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function runit() {
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node.child = spawn(node.cmd, node.args);
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if (RED.settings.verbose) { node.log(node.cmd+" "+JSON.stringify(node.args)); }
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node.status({fill:"green",shape:"dot",text:"running"});
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node.running = true;
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node.on("input", inputlistener);
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node.child.stdout.on('data', function (data) {
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if (node.op == "string") { data = data.toString(); }
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if (node.op == "number") { data = Number(data); }
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if (RED.settings.verbose) { node.log("out: "+data); }
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if (data && data.trim() !== "") {
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var msg = {payload:data};
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node.send([msg,null,null]);
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}
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});
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node.child.stderr.on('data', function (data) {
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if (node.op == "string") { data = data.toString(); }
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if (node.op == "number") { data = Number(data); }
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if (RED.settings.verbose) { node.log("err: "+data); }
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var msg = {payload:data};
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node.send([null,msg,null]);
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});
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node.child.on('close', function (code) {
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if (RED.settings.verbose) { node.log("ret: "+code); }
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var msg = {payload:code};
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node.send([null,null,msg]);
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node.child = null;
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node.running = false;
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node.status({fill:"red",shape:"ring",text:"stopped"});
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});
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node.child.on('error', function (err) {
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if (err.errno === "ENOENT") { node.warn('Command not found'); }
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else if (err.errno === "EACCES") { node.warn('Command not executable'); }
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else { node.log('error: ' + err); }
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node.status({fill:"grey",shape:"dot",text:"error"});
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});
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}
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if (node.redo === true) {
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var loop = setInterval( function() {
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if (!node.running) {
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node.removeListener('input', inputlistener);
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node.warn("Restarting : " + node.cmd);
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runit();
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}
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}, 10000); // Restart after 10 secs if required
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}
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node.on("close", function() {
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if (node.child != null) { node.child.kill('SIGKILL'); }
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if (RED.settings.verbose) { node.log(node.cmd+" stopped"); }
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clearInterval(loop);
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});
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runit();
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}
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RED.nodes.registerType("daemon",DaemonNode);
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}
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