logger

Opinionated wrapper and configurator for the winston logging toolkit.

The following transports are supported:

• Elasticsearch transport using a specific transformer
• Console (Winston built-in transport)
• File (Winston built-in transport)

These transports can be added and configured with a corresponding property in the options hash:

  "console": {
    "handleExceptions": false,
    "level": "silly",
    "colorize": true,
    "prettyPrint": true
  },
  "file": {
    ...
  },
  "elasticsearch": {
    ...
  }

The logger returns a Winston logger instance which has methods that correspond to the following levels:

• silly
• verbose
• debug
• info
• warn
• error
• log (generic)

In addition there is a generic log() function.

Notes

Console logger

A custom format is defined that outputs the rid (request-id) if it is set using cls-rtracer module.

Elastichsearch logger

The following changes and transformations are applied to log messages:

• Adds a @timestamp field with the current date/ time
• Adds a host property with the current host name
• Adds a rid (request-id) based on cls-rtracer

This module also comes with a suitable mapping template and an index pattern that can be imported in Kibana.

Usage

Instantiation

let logger = createLogger(opts);

Logging

Logging in general:

logger.<level>('Textual message');

// or

logger.log(<level>, 'Textual message');

The parameters for the log statements are built like this:

logger.info('Textual message');

// or

logger.info({ key: 'value' });

// or

logger.info('Textual message', { key: 'value' });

No other variants are supported.

See test.ts and the Winston documentation.