mirror of
https://github.com/node-red/node-red-nodes.git
synced 2023-10-10 13:36:58 +02:00
117 lines
4.7 KiB
JavaScript
117 lines
4.7 KiB
JavaScript
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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.trim().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 (msg.hasOwnProperty("kill") && node.running) {
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if (typeof msg.kill !== "string" || msg.kill.length === 0 || !msg.kill.toUpperCase().startsWith("SIG") ) { msg.kill = "SIGINT"; }
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node.child.kill(msg.kill.toUpperCase());
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}
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else if (msg.hasOwnProperty("start") && !node.running) {
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runit();
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}
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else {
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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.running) { 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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}
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function runit() {
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if (!node.cmd || (typeof node.cmd !== "string") || (node.cmd.length < 1)) {
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node.status({fill:"grey",shape:"ring",text:"no command"});
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return;
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}
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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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var line = "";
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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 (node.op === "lines") {
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line += data.toString();
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var bits = line.split("\n");
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while (bits.length > 1) {
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node.send([{payload:bits.shift()},null,null]);
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}
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line = bits[0];
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}
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else {
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if (data && (data.length !== 0)) {
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node.send([{payload:data},null,null]);
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}
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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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node.send([null,{payload:data},null]);
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});
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node.child.on('close', function (code,signal) {
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if (RED.settings.verbose) { node.log("ret: "+code+":"+signal); }
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node.running = false;
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node.child = null;
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var rc = code;
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if (code === null) { rc = signal; }
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node.send([null,null,{payload:rc}]);
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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(done) {
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clearInterval(loop);
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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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node.status({});
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setTimeout(function() { done(); }, 100);
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});
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runit();
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node.on("input", inputlistener);
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}
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RED.nodes.registerType("daemon",DaemonNode);
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}
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