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 (msg.hasOwnProperty("kill") && node.running) { if (typeof msg.kill !== "string" || msg.kill.length === 0 || !msg.kill.toUpperCase().startsWith("SIG") ) { msg.kill = "SIGINT"; } node.child.kill(msg.kill.toUpperCase()); } else if (msg.hasOwnProperty("start") && !node.running) { runit(); } else { 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.running) { node.child.stdin.write(msg.payload); } else { node.warn("Command not running"); } } } } function runit() { if (!node.cmd || (typeof node.cmd !== "string") || (node.cmd.length < 1)) { node.status({fill:"grey",shape:"ring",text:"no command"}); return; } 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,signal) { if (RED.settings.verbose) { node.log("ret: "+code+":"+signal); } node.running = false; node.child = null; var rc = code; if (code === null) { rc = signal; } node.send([null,null,{payload:rc}]); 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(done) { clearInterval(loop); if (node.child != null) { node.child.kill('SIGKILL'); } if (RED.settings.verbose) { node.log(node.cmd+" stopped"); } node.status({}); setTimeout(function() { done(); }, 100); }); runit(); } RED.nodes.registerType("daemon",DaemonNode); }