cantina-log

JSON-powered logging for Cantina applications. Extends jog with some Cantina-specific functionality.

Usage

Setting up your app:

var app = require('cantina').createApp();

app.boot(function (err) {

  // Load the logging plugin.
  app.require('cantina-log');

  // Load the rest of your plugins.

  app.start();
});

Start logging...

// Perferred logging method:
app.log('type', {
  // data
})

// console.log-style logging.
app.log('My message with %s tokens in it', 'some');

// dump an object.
app.log({my: 'data'});

// Use levels:
app.log.info('type', { /* data */ });
app.log.debug('type', { /* data */ });
app.log.warn('type', { /* data */ });
app.log.error('type', { /* data */ });

Configuration

The following configuration (defaults shown) is supported.

{
  log: {
    trace: true,
    req: {
      enable: true,
      exclude: /(\.js$)|(\.css$)|(\/images.*)|(favicon.ico)|(\.hbs$)/
    }
  }
}

• trace - Adds file and line number to all log entries. Should be turned OFF in production.
• req
  • enable - Adds middleware that logs all requests.
  • exclude - A regular expression identifying paths to exclude from the logs.

Overriding console

• app.log.replaceConsole() - Override console's logging methods with app.log variants.
• app.log.restoreConsole() - Restore console to its orginal state.

Using a custom jog store

jog logs using a 'store'. The default is StdStore which logs to stdout and stderr. If you prefer to use a FileStore, RedisStore, or something custom you can tell the app like so:

var app = require('cantina').createApp()
  , jog = require('jog2');

app.boot(function (err) {
  // Pre-log app setup.

  // Specify your store.
  app.loggerStore = new jog.FileStore('/tmp/log');

  // Load the logging plugin.
  app.require('cantina-log');

  // Load the rest of your plugins.

  app.start();
});

Data serialization

You may find yourself logging simliar kinds of application object, such as 'user' models. You can log the raw user objects and implement a serializer to santize it for the logs.

app.hook('log:serialize').add(function (data, next) {
  if (data.user) {
    var user = data.user;
    data.user = {
      id: user.id,
      name: user.first + ' ' + user.last,
      // ... etc.
    };
  }
  next();
});

CLI

Now that your log output is in nice, parseable JSON, you may want to be able to read it on the command-line in a more human-friendly format. Joli is a CLI that helps you format newline-separated JSON object (like the ones cantina-log outputs).

Please see joli's README for full documentation.

Developed by Terra Eclipse

Terra Eclipse, Inc. is a nationally recognized political technology and strategy firm located in Santa Cruz, CA and Washington, D.C.