RainCatcher

RainCatcher utilises the raindrops statistics tool to automatically log queue data for Rack web servers (e.g. Unicorn) running Rails.

Installation

Add this line to your application's Gemfile:

gem 'rain_catcher', '~> 0.2.3'

And rebuild your bundle:

bundle install

Usage

RainCatcher automatically adds a hook into all web requests made to your application controller which will make a new log entry not more frequently than a predetermined interval.

When each request is processed, if the configured interval has elapsed then a log entry will be made.

Variable	Default Value	Meaning
RAIN_CATCHER_LOG_INTERVAL	30	Minimum number of seconds between each log entry
RAIN_CATCHER_LOG_LEVEL	INFO	Log level to use for log entries
RAIN_CATCHER_APPLICATION_NAME	[inferred from Rails]	Application identifier which will be included in all log entries

Log Structure

Log entries are output as JSON. For example:

{"active":5,"queued":2,"source":"rain_catcher","application":"myapp","environment":"production"}