Scrolls

Scrolls is a library for generating logs of the structure key=value.

Installation

Add this line to your application's Gemfile:

gem 'scrolls'

And then execute:

$ bundle

Or install it yourself as:

$ gem install scrolls

Philosophy

Scrolls follows the belief that logs should be treated as data. One way to think of them is the blood of your infrastructure. Logs are a realtime view of what is happening on your systems.

Need to know!

The way Scrolls handles "global_context" is changing after v0.3.8. Please see the release notes and this documentation for more information. I apologize for any trouble this may cause.

Documentation:

I apologize, some of these are a WIP.

• Sending logs to syslog using Scrolls
• Logging contexts
• Adding timestamps by default
• Misc Features

Usage

require 'scrolls'

Scrolls.add_timestamp = true
Scrolls.global_context(:app => "scrolls", :deploy => ENV["DEPLOY"])

Scrolls.log(:at => "test")

Scrolls.context(:context => "block") do
  Scrolls.log(:at => "exec")
end

begin
  raise
rescue Exception => e
  Scrolls.log_exception(:at => "raise", e)
end

Produces:

now="2014-01-17T16:11:39Z" app=scrolls deploy=nil at=test
now="2014-01-17T16:11:39Z" app=scrolls deploy=nil context=block at=exec
now="2014-01-17T16:11:39Z" app=scrolls deploy=nil at=exception class=RuntimeError message= exception_id=70312608019740
now="2014-01-17T16:11:39Z" app=scrolls deploy=nil at=exception class= exception_id=70312608019740 site="./test.rb:16:in <main>"

History

This library originated from various logging methods used internally at Heroku. Starting at version 0.2.0 Scrolls was ripped apart and restructured to provide a better foundation for the future. Tests and documentation were add at that point as well.

Thanks to the following people for influencing this library.

• Mark McGranaghan
• Noah Zoschke
• Mark Fine
• Fabio Kung
• Ryan Smith

LICENSE

MIT License