Bunyan-log-helper NPM

Overview

Very simple wrapper for creating Bunyan loggers from a common base.

Creates logging that uses a prefix and module approach.
Automatically create the console logger using Bunyan-pretty-stream module.

Inspiration

I kept doing this in project after project, so decided to make it a module. Not much more to it than that. Bunyan is great especially when you use it with LogStash - basically replaces Splunk. But sometimes you need console printing.

Installation

npm install bunyan-log-helper

Usage

const Logger = require('bunyan-log-helper');

const logOpts = {
  prefix: 'myapp',
  level: 'debug',
  outputStreams: [{
    type: 'rotating-file',
    period: '1d',
    count: 3,
    level: 'info',
    path: path.resolve(path.join(__dirname, '../../logs/dataload.log')),
  }],
  console: true
}

const _Logger = new Logger(logOpts);
const logger = _Logger.logger('module-1');

logger.info('hello world');

What does it do?

Automatically configures the console logger if enabled.

Also writes logs as units within a main application. Notice the 'unit=module1'.

[2017-03-29T08:37:44.371Z]  INFO: myApp/6416 on localhost: Hello World (unit=module1)

The benefit of using the child logger, is you can use hierarchical logging, so you can filter logs to applications and units within those applications.

Example should go here

Settings

Pass the logging settings to the class constructor.

Setting	Type	Description
level	String	Debug/Info/Warn etc.
prefix	String	Log name will be prefixed with this. Use your main app name.
outputStreams	Object[]	Array of output streams (not including console)
console	Boolean	Whether to enable console logging

n.b level passed for a particular output stream will override top level.

Example Settings

// base settings.js
module.exports = {
      level: 'debug',
      outputStreams: [{
        type: 'rotating-file',
        period: '1d',
        count: 3,
        level: 'info',
        path: path.resolve(path.join(__dirname, '../../logs/dataload.log')),
        }],
      console: true
}