raumstatus/node/ip-poll.js

70 lines
2.0 KiB
JavaScript

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('onlinecount', "-inf", time - 7*24*60*1000);
var num = matches[1];
redisClient.zadd('onlinecount', time, time + "|" + num, function() {
self.emit('doneCount', 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('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;