CODEWITHSUNDEEP
node.jstcp
Yuriy Nemtsov
Yuriy Nemtsov

Reputation: 3915

How to monitor outgoing HTTP requests in Node.js?

I'm building a small developer tool (HUD) for an app written in node. In the tool, I want to surface all HTTP/HTTPS requests that were made in order to serve that page (to display them to the developer and record their number). Is there a clean way to do so, which does not involve wrapping something like http.request()? If not, what is the lowest level method that would need to be wrapped in order to log both HTTP & HTTPS? How about for TCP connections?

Upvotes: 4

Views: 5633

Answers (1)

rdrey
rdrey

Reputation: 9529

The answer to this depends on how complicated your code is. If you make 3 or 4 requests for external resources on each request, just manually inserting profiling code there is probably the cleanest and simplest solution.

If you fire many many requests, monkey-patching (wrapping) http.request and https.request can be done quite easily.

patcher = (patchMe) ->
  original = patchMe.request
  patchMe.request = (options, callback) ->
    console.log options.host, options.method # or any other counting, profiling
    original(options, callback)

http = require 'http'
https = require 'https'

patcher(http)
patcher(https)

If you want to patch more than those requests, on the tcp/udp level, you'll unfortunately have to go read the source to figure out which underlying method you could patch, I haven't gone there.

I enjoyed reading the source of nodetime, which monkey-patches the require function to profile any uses of specific functions / modules deeper in your code. Go read that source! :)

Upvotes: 6

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