grape_logging

Installation

Add this line to your application's Gemfile:

gem 'grape_logging'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install grape_logging

Basic Usage

In your api file (somewhere on the top)

require 'grape_logging'
logger.formatter = GrapeLogging::Formatters::Default.new
use GrapeLogging::Middleware::RequestLogger, { logger: logger }

ProTip: If your logger doesn't support setting formatter you can remove this line - it's optional

Features

Log Format

With the default configuration you will get nice log message

[2015-04-16 12:52:12 +0200] INFO -- 200 -- total=2.06 db=0.36 -- PATCH /your_app/endpoint params={"some_param"=>{"value_1"=>"123", "value_2"=>"456"}}

If you prefer some other format I strongly encourage you to do pull request with new formatter class ;)

You can change the formatter like so

class MyAPI < Grape::API
  use GrapeLogging::Middleware::RequestLogger, logger: logger, format: MyFormatter.new
end

Customising What Is Logged

You can include logging of other parts of the request / response cycle by including subclasses of GrapeLogging::Loggers::Base

class MyAPI < Grape::API
  use GrapeLogging::Middleware::RequestLogger,
    logger: logger,
    include: [ GrapeLogging::Loggers::Response.new,
               GrapeLogging::Loggers::FilterParameters.new ]
end

The FilterParameters logger will filter out sensitive parameters from your logs. If mounted inside rails, will use the Rails.application.config.filter_parameters by default. Otherwise, you must specify a list of keys to filter out.

Logging to file and STDOUT

You can log to file and STDOUT at the same time, you just need to assign new logger

log_file = File.open('path/to/your/logfile.log', 'a')
log_file.sync = true
logger Logger.new GrapeLogging::MultiIO.new(STDOUT, log_file)

Logging via Rails instrumentation

You can choose to not pass the logger to grape_logging but instead send logs to Rails instrumentation in order to let Rails and its configured Logger do the log job, for example. First, config grape_logging, like that:

class MyAPI < Grape::API
  use GrapeLogging::Middleware::RequestLogger,
    instrumentation_key: 'grape_key',
    include: [ GrapeLogging::Loggers::Response.new,
               GrapeLogging::Loggers::FilterParameters.new ]
end

and then add an initializer in your Rails project:

# config/initializers/instrumentation.rb

# Subscribe to grape request and log with Rails.logger
ActiveSupport::Notifications.subscribe('grape_key') do |name, starts, ends, notification_id, payload|
  Rails.logger.info payload
end

The idea come from here: https://gist.github.com/teamon/e8ae16ffb0cb447e5b49

Logging exceptions

If you want to log exceptions you can do it like this

class MyAPI < Grape::API
  rescue_from :all do |e|
    MyAPI.logger.error e
    #do here whatever you originally planned to do :)
  end
end

Development

After checking out the repo, run bin/setup to install dependencies. Then, run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release to create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Fork it ( https://github.com/aserafin/grape_logging/fork )
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create a new Pull Request

cdunn/grape_logging