raumstatus/node/ip-poll.js

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var redis = require("redis");
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var util = require('util');
var EventEmitter = require('events').EventEmitter;
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var exec = require('child_process').exec;
var redisprefix = "ippoll:";
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var IpPoll = function(switchaddr, hostsaddr) {
var self = this;
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var redisClient = redis.createClient();
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var regexp = /\(([0-9]+) hosts* up\)/;
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var nmap = "nmap -n -sP -T5 ";
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redisClient.on("connect", function () {
console.log("connected to redis");
self.emit('ready');
});
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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('onlinecount', "-inf", time - 7*24*60*1000);
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var num = matches[1];
redisClient.zadd('onlinecount', time, time + "|" + num, function() {
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self.emit('doneCount', num);
});
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}
}
});
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};
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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");
}
});
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};
this.getHistory = function(start, end, callback) {
redisClient.zrangebyscore('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);
});
};
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};
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util.inherits(IpPoll, EventEmitter);
module.exports = IpPoll;