Correlation Logger

Correlation logger is custom logger written to manage all types of logs in your microservices.
It can log each request and reponse of the microservice.
Additionally it can also be used to log error and info with correlationId.

Setup

$3

``bash
npm install --save correlation-logger
`

$3

`
STORE_APP_NAME=your-app-name
ENV=production
`

value STORE_APP_NAME should not contain spaces.
Other supported ENVs are test, staging, development.

$3

`bash
mkdir logs
echo logs/ >> .gitignore
`

It writes logs in logs/combined.log.

$3

#### To log Request and Response

Add the below lines to the microservice's server file ("app" in the code is an implied reference to an instance of Express()):

`javascript
const requestLogger = require("correlation-logger");

requestLogger(app);
`

#### To add custom logging

`javascript
const { logger } = require("correlation-logger/logger");

// To log information
logger.info("some useful", "information");

// to log error
logger.error("some-error", "more info");
`

Other supported methods are -

- warn
- verbose
- debug
- silly

#### To forward correlation-id in request and request-promise

This is needed if you wanna track a request flowing through several microservices.

`javascript
// It returns a wrapper around request package with added default correlation-id header
const request = require("correlation-logger/request")
`

If you are using request-promise-native package. Use below wrapper for default correlation-id header

`javascript
// It returns a wrapper around request-promise-native package with added default correlation-id header
const requestPromiseNative = require("correlation-logger/request-promise-native")
`

Likewise to use wrapper of request-promise package. Use below wrapper

`javascript
// It returns a wrapper around request-promise package with added default correlation-id header
const requestPromise = require("correlation-logger/request-promise")
``