prisme-flow/nodes/bridge/ping/ping.js

prisme platform flow engine

/**
 * Created by prisme.io on 09/06/2017.
 */
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' || plat == 'freebsd') { 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)
}