metrics-server

metrics-server

metrics-server is a basic metrics server and client. The client uses UDP to send metric to the server. The server stores all metric into a mongodb database.

examples

var usage = require('usage');

var udpServer = require('./lib/udpserver').createServer({
	host : '127.0.0.1',
	port : 4001,
	mongodb : {
		host : '127.0.0.1'
	}
});

var webServer = require('./lib/webserver').createServer({
	udp : udpServer,
	host : '127.0.0.1',
	port : 4002,
	mongodb : {
		host : '127.0.0.1'
	}
});

var memory = require('./lib/metric').createMetric({
	host : '127.0.0.1',
	port : 4001
});

var cpu = require('./lib/metric').createMetric({
	host : '127.0.0.1',
	port : 4001
});

memory.interval = cpu.interval = false;
memory.token = cpu.token = 'random-token';

memory.name = 'memory';
cpu.name = 'cpu';

var pid = process.pid;
setInterval(function() {

	usage.lookup(pid, {
		keepHistory : true
	}, function(err, result) {
		memory.cb(result.memory);
		cpu.cb(result.cpu);
	});
}, 1000);

webServer.start();
udpServer.start();
memory.start();
cpu.start();

Methods

var Metrics = require('metrics-server')

var udpserver = Metrics.udpserver.createServer(opts);

To create the UDP server. This is used to recive metrics from the clients. Options to pass in are

{
	host : '127.0.0.1',
	port : 4001,
	mongodb : {
		host : '127.0.0.1',
		port : 27017,
		path : '/data/db'
	}
}

udpserver.start()

Call udpserver.start to start the server

var webserver = Metrics.webserver.createServer(opts);

To create the UDP server. This is used to recive metrics from the clients. Options to pass in are

{
	host : '127.0.0.1',
	port : 4002,
	mongodb : {
		host : '127.0.0.1',
		port : 27017,
		path : '/data/db'
	}
}

webserver.start()

Call webserver.start to start the server

var metric = Metrics.metric.createMetric(opts)

This is used to send metrics to the server.

{
	host : '127.0.0.1',//use the udp server host
	port : 4002//use the udp server port
}

metric.token = uuid()

metric.token is used to group metrics together. The token should non guessable string.

metric.name = 'cpu'

metric.name is the name of the metrics type

metric.interval = 5000

metric.interval is the interval in milliseconds between calls to metric.run() If you set this to false then you can manually call metric.cb(metricValue)

metric.run = function(cb){}

metric.run is the function that is called when using metric.interval

metric.run = function(cb){
	setTimeout(function(){
		cb(Math.floor((Math.random() * 100) + 1));
	},100);
}

metric.cb(value)

metric.cb is used when metric.interval is set to false You would call it directly when you dont want call metric.run

setInterval(function(){
	metric.cb(Math.floor((Math.random() * 100) + 1));
},1000);

metric.start()

Call metric.start to start collection metrics

##API Metrics.webserver is used to recive metric from the database.

GET /metric/:token

Called to recive metrics from the DB

query name=cpu

Query the database for e certen metrics name.

query from=2014-05-08T00:04:56.656Z

Query the database from a certain time.

query to=2014-05-08T00:04:56.656Z

Query the database to a certain time. Must include from.

query limit=500

Query the database and pull out 500. Defaults to 1000, MAX is 10000.

GET /metric/:token/count

Count the metrics in the DB. Same query params can be sent as /metric/:token