var redis = require("redis"); var util = require('util'); var EventEmitter = require('events').EventEmitter; var exec = require('child_process').exec; var redisprefix = "ippoll:"; var IpPoll = function(switchaddr, hostsaddr) { var self = this; var redisClient = redis.createClient(); var regexp = /\(([0-9]+) hosts* up\)/; var nmap = "nmap -n -sP -T4 "; redisClient.on("connect", function () { console.log("connected to redis"); self.emit('ready'); }); this.pollCount = function() { exec(nmap + "--min-hostgroup 10 " + hostsaddr, function (error, stdout, stderr) { if(error == null) { var matches = regexp.exec(stdout); if(matches != null && matches.length == 2) { var time = Date.now(); redisClient.zremrangebyscore(redisprefix + 'onlinecount', "-inf", time - 7*24*60*1000); var num = matches[1]; redisClient.zadd(redisprefix + 'onlinecount', time, time + "|" + num, function() { self.emit('doneCount', parseInt(num)); }); } } }); }; this.pollState = function() { exec(nmap + switchaddr, function (error, stdout, stderr) { if(error == null) { var matches = regexp.exec(stdout); if(matches != null && matches.length == 2) { self.emit('doneState', matches[1] == "1"); } } else { self.emit('doneState', "unknown"); } }); }; this.getHistory = function(start, end, callback) { redisClient.zrangebyscore(redisprefix + 'onlinecount', "-inf", "+inf", function(err, replies) { var data = []; replies.forEach(function (reply, i) { var line = reply.split('|'); data.push( { at: moment(parseInt(line[0])).format(), value: line[1] }); }); callback(data); }); }; }; util.inherits(IpPoll, EventEmitter); module.exports = IpPoll;