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node-red-nodes/io/ping/88-ping.js

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module.exports = function(RED) {
"use strict";
var spawn = require('child_process').spawn;
var plat = require('os').platform();
function PingNode(n) {
RED.nodes.createNode(this,n);
this.host = n.host;
this.timer = n.timer * 1000;
var node = this;
node.tout = setInterval(function() {
var ex;
if (plat == "linux") { ex = spawn('ping', ['-n', '-w', '5', '-c', '1', node.host]); }
else if (plat.match(/^win/)) { ex = spawn('ping', ['-n', '1', '-w', '5000', node.host]); }
else if (plat == "darwin") { ex = spawn('ping', ['-n', '-t', '5', '-c', '1', node.host]); }
else { node.error("Sorry - your platform - "+plat+" - is not recognised."); }
var res = false;
var line = "";
//var regex = /from.*time.(.*)ms/;
var regex = /=.*[<|=]([0-9]*).*TTL|ttl..*=([0-9\.]*)/;
ex.stdout.on('data', function (data) {
line += data.toString();
});
//ex.stderr.on('data', function (data) {
//console.log('[ping] stderr: ' + data);
//});
ex.on('close', function (code) {
var m = regex.exec(line)||"";
if (m !== '') {
if (m[1]) { res = Number(m[1]); }
if (m[2]) { res = Number(m[2]); }
}
var msg = { payload:false, topic:node.host };
if (code === 0) { msg = { payload:res, topic:node.host }; }
try { node.send(msg); }
catch(e) {}
});
}, node.timer);
this.on("close", function() {
if (this.tout) { clearInterval(this.tout); }
});
}
RED.nodes.registerType("ping",PingNode);
}