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

/**
 * 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);