rest-analytics

A simple node.js module that provides analytics for REST services.

This is still a work in progress and lots of info are still missing from the analytics.

Usage

Add it to your connect/express application by using it's middleware.

npm install rest-analytics

// Initialize analytics;
var RestAnalytics = require('rest-analytics');
var analytics = new RestAnalytics();

// Use it in your express app
var express = require('express');
var app = express();
app.use(analytics.middleware());

// Get a collection of analytics
analytics.analytics();

// Get a collection of analytics for a specific method/url
analytics.analytics('get', '/users');

Analytics

Currently, analytics per method/path pair contain the following information:

• count: Number of calls for a specific method/pair
• time.min: Minimum ellapsed time processing a request (in nanoseconds).
• time.max: Minimum ellapsed time processing a request (in nanoseconds).
• time.avg: Average ellapsed time processing a request (in nanoseconds).

You can get analytics on method/path pairs by calling the analytics method:

// read analytics for a specific method/path
var data = analytics.analytics('get', '/user');
console.log(data);

// {
//   'count': ...
//   'time': {
//     'min': ...
//     'max': ...
//     'avg': ...
//   }
// }

// read analytics for all calls to a path
var data = analytics.analytics('/user');
console.log(data);

// {
//   'get': ...
//   'post': ...
// }

// read all analytics
var data = analytics.analytics();
console.log(data);

// {
//   '/user': {
//     'get': ...
//     'post': ...
//   },
//   '/company': {
//     'get': ...
//   }
// }

Events

call

Α 'call' event will be emitted when a request is completed (after the response is sent). It can be used to integrate collected data with other analytics systems like Elasticsearch or StatsD.

The payload of the event will contain information about this specific request:

var express = require('express');
var RestAnalytics = require('rest-analytics');

var app = express();
var analytics = new RestAnalytics();
data.analytics.on('call', function(payload) {
    console.log(payload);
});

app.use(analytics.middleware());

A payload example json is:

{
    "request": {
        "path": "/user",
        "ip": "127.0.0.1",
        "method": "GET",
        "headers": [
            {
                "key": "header",
                "value": "header value"
            }
        ],
        "query": {},
        "parameters": []
    },
    "response": {
        "status": 200,
        "headers": [
            {
                "key": "header",
                "value": "header value"
            }
        ]
    },
    "timestamp": 1418557961891,     // timestamp of call (in ms)
    "duration": 0.40668             // duration of the call (in ms)
}