https://github.com/tafarij/micro-correlation-id

Correlate http requests across microservices built with zeit/micro
https://github.com/tafarij/micro-correlation-id

Last synced: about 1 month ago
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Correlate http requests across microservices built with zeit/micro

• Host: GitHub
• URL: https://github.com/tafarij/micro-correlation-id
• Owner: tafarij
• License: mit
• Created: 2018-03-01T17:27:50.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2023-10-17T22:07:37.000Z (8 months ago)
• Last Synced: 2024-04-03T22:20:23.987Z (2 months ago)
• Language: JavaScript
• Size: 625 KB
• Stars: 10
• Watchers: 3
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md

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• awesome-micro - micro-correlation-id - Correlate http requests across microservices. (Modules / HTTP Requests)

README

        
# micro-correlation-id

> Correlate http requests across microservices built with [micro](https://github.com/zeit/micro).

This a [micro](https://github.com/zeit/micro) module for setting a [correlation id](https://blog.rapid7.com/2016/12/23/the-value-of-correlation-ids/) per HTTP request. The correlation id associated with a request remains consistent across async calls made within the scope of the request handler.

This module is inspired by [express-correlation-id](https://github.com/toboid/express-correlation-id) and makes use of [AsyncLocalStorage](https://nodejs.org/api/async_context.html#class-asynclocalstorage).

## Installation

```bash

# npm

npm i -S micro-correlation-id

# or yarn

yarn add micro-correlation-id

```

## Usage

```javascript

const { correlator, getId } = require('micro-correlation-id');

const assert = require('assert');

module.exports = correlator()(async (req, res) => {

  // These values will always be the same within this scope

  assert.equal(req.correlationId(), getId());

  res.end();

});

```

## API

### `correlator(idHeader='x-correlation-id')`

This creates and/or sets the correlation id on each incomming request. If the incoming request has a correlation id then that id is preserved, a new uuid is assigned otherwise. The correlation id may be accessed using `req.correlationId()` or `getId()`.

`correlator` takes and optional argument `idHeader` which defaults to `x-correlation-id`. This is HTTP header key used for passing a correlation id. You may change this to your liking.

### `getId()`

Use this to get the current correlation id from any where within a request handler. It will always be equivalent to `req.correlationId()`.

## License

[MIT](LICENCE)