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

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/**
* Copyright 2013 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.
**/
var RED = require(process.env.NODE_RED_HOME+"/red/red");
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;
ex.stdout.on('data', function (data) {
//console.log('[ping] stdout: ' + data.toString());
var regex = /from.*time.(.*)ms/;
var m = regex.exec(data.toString())||"";
if (m != '') { res = Number(m[1]); }
});
ex.stderr.on('data', function (data) {
//console.log('[ping] stderr: ' + data);
});
ex.on('close', function (code) {
//console.log('[ping] result: ' + code);
var msg = { payload:false, topic:node.host };
if (code == 0) msg = { payload:res, topic:node.host };
node.send(msg);
});
}, node.timer);
this.on("close", function() {
clearInterval(this.tout);
});
}
RED.nodes.registerType("ping",PingNode);