Sneakers

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A high-performance RabbitMQ background processing framework for Ruby.

Sneakers is being used in production for both I/O and CPU intensive workloads, and have achieved the goals of high-performance and 0-maintenance, as designed.

Visit the wiki for complete docs.

Installation

Add this line to your application's Gemfile:

gem 'sneakers'

And then execute:

$ bundle

Or install it yourself as:

$ gem install sneakers

Quick start

Set up a Gemfile

source 'https://rubygems.org'
gem 'sneakers'
gem 'json'
gem 'redis'

And a worker

require 'sneakers'
require 'redis'
require 'json'

$redis = Redis.new

class Processor
  include Sneakers::Worker
  from_queue :logs


  def work(msg)
    err = JSON.parse(msg)
    if err["type"] == "error"
      $redis.incr "processor:#{err["error"]}"
    end

    ack!
  end
end

As an example, make a message look like this: We'll count errors and error types with Redis. Specifically for an error that looks like this:

{
   "type": "error",
   "message": "HALP!",
   "error": "CODE001"
}

Let's test it out quickly from the command line:

sneakers work Processor --require boot.rb

We just told Sneakers to spawn a worker named Processor, but first --require a file that we dedicate to setting up environment, including workers and what-not.

If you go to your RabbitMQ admin now, you'll see a new queue named logs was created. Push a couple messages, and this is the output you should see at your terminal.

2013-10-11T19:26:36Z p-4718 t-ovqgyb31o DEBUG: [worker-logs:1:213mmy][#<Thread:0x007fae6b05cc58>][logs][{:prefetch=>10, :durable=>true, :ack=>true, :heartbeat_interval=>2, :exchange=>"sneakers"}] Working off: log log
2013-10-11T19:26:36Z p-4718 t-ovqgyrxu4 INFO: log log
2013-10-11T19:26:40Z p-4719 t-ovqgyb364 DEBUG: [worker-logs:1:h23iit][#<Thread:0x007fae6b05cd98>][logs][{:prefetch=>10, :durable=>true, :ack=>true, :heartbeat_interval=>2, :exchange=>"sneakers"}] Working off: log log
2013-10-11T19:26:40Z p-4719 t-ovqgyrx8g INFO: log log

And redis will show this:

➜  ~  redis-cli monitor
1381520329.888581 [0 127.0.0.1:49182] "incr" "processor:CODE001"

We're basically done with the ceremonies and all is left is to do some real work.

Looking at metrics

Let's use the logging_metrics provider just for the sake of fun of seeing the metrics as they happen.

# boot.rb
require 'sneakers'
require 'redis'
require 'json'
require 'sneakers/metrics/logging_metrics'
Sneakers.configure :metrics => Sneakers::Metrics::LoggingMetrics.new

# ... rest of code

Now push a message again and you'll see:

2013-10-11T19:44:37Z p-9219 t-oxh8owywg INFO: INC: work.Processor.started
2013-10-11T19:44:37Z p-9219 t-oxh8owywg INFO: TIME: work.Processor.time 0.00242
2013-10-11T19:44:37Z p-9219 t-oxh8owywg INFO: INC: work.Processor.handled.ack

Which increments start + end, and times the work unit.

From here, you can continue over to the Wiki

Contributing

Fork, implement, add tests, pull request, get my everlasting thanks and a respectable place here :).

Thanks:

Michael Klishin - @michaelklishin
Ariel Zerahia - @arielze
@sergei-matheson
Sebastian Edwards - @SebastianEdwards
Tor Ivry - @torkale