@gasket/plugin-winston

Set up a winston logger instance for the Gasket logger.

Installation

npm i @gasket/plugin-winston

Update your gasket file plugin configuration:

// gasket.js

+ import pluginWinston from '@gasket/plugin-winston';

export default makeGasket({
  plugins: [
+   pluginWinston
  ]
});

Configuration

To customize the logger, add a winston object to your gasket.js. The properties of this object override the default logging configuration supplied by Gasket.

export default makeGasket({
  winston: {
    level: 'warning'
  },

  environments: {
    local: {
      winston: {
        level: 'debug'
      }
    }
  }
});

Options

• Select winston configuration values – (multiple) See below for these additional supported properties.

The winston documentation enumerates which properties can be configured. To support best practices & avoid common gotchas, only a subset of these properties are configurable through gasket.

Configurable in gasket

Name	Default	Description
level	'info' ('debug' in ENV=local)	Log only if info.levelless than or equal to this level
transports	[new Console()] (Console logging)	Set of logging targets for info messages
silent	false	If true, all logs are suppressed
levels	winston.config.syslog.levels	Levels (and colors) representing log priorities
format	Gasket-defined format	Formatting for messages (see: Formats)

Note: While levels are configurable, if you specify your own levels, you should specify a superset of the default levels (available as Log.levels) above to ensure your gasket application functions successfully. You are also responsible for calling winston.addColors for any additional levels that you provide.

Note: While format is configurable, it is recommended that you call format.combine with your custom formats and the result of Log.getDefaultFormat(local,prefix) to maintain the consistent functionality

Not Configurable in gasket

Name	Fixed Value	Description
exitOnError	true	Ensures uncaught errors trigger process.exit

Example adding custom Winston transports

Console transports are set by default. Loggers provided by winston are highly customizable using [Transports].

gasket.js

import { transports } from 'winston';

export default makeGasket({
  winston: {
    level: 'warning',
    transports: [
      // Unified errors.log for all error messages
      // in all environments
      new transports.File({
        filename: 'errors.log',
        level: 'error'
      })
    ]
  }
});

Lifecycles

winstonTransports

To add custom logger transports, you can also hook the winstonTransports lifecycle and return a transport or an array of transports you wish to add to the logger. Here's an example gasket config and a hook that uses that config to add a FluentD transport:

// gasket.js
export default makeGasket({
  winston: {
    level: 'warning'
  },

  fluentd: {
    host: 'localhost',
    port: 24224,
    timeout: 3
  },

  environments: {
    prod: {
      fluentd: {
        host: 'k8cluster.dns.fluentd',
        port: 24224,
        timeout: 3
      }
    }
  }
});

// sample-plugin.js
import fluent from 'fluent-logger';
const FluentTransport = fluent.support.winstonTransport();

export default {
  name: 'sample-plugin',
  hooks: {
    winstonTransports(gasket) {
      return new FluentTransport('mytag', gasket.config.fluentd);
    }
  }
};

Test

If you are contributing to this plugin, use the following to run the tests:

npm test

License

MIT