EM-REDIS¶ ↑

DESCRIPTION:¶ ↑

An EventMachine based library for interacting with the very cool Redis data store by Salvatore ‘antirez’ Sanfilippo. Modeled after eventmachine’s implementation of the memcached protocol, and influenced by Ezra Zygmuntowicz’s redis-rb library (distributed as part of Redis).

This library is only useful when used as part of an application that relies on Event Machine’s event loop. It implements an EM-based client protocol, which leverages the non-blocking nature of the EM interface to acheive significant parallelization without threads.

WARNING: this library is my first attempt to write an evented client protocol, and isn’t currently used in production anywhere. All that bit in the license about not being warranted to work for any particular purpose really applies.

FEATURES/PROBLEMS:¶ ↑

• Implements most Redis commands (see the list of available commands here with the notable

exception of MONITOR and AUTH

TODO:¶ ↑

• Right now method names are identical to Redis command names. I’ll add some nice aliases soon.

• I’m sure multibulk responses can be handled more elegantly

• Better default error handling? Provide a default response block?

SYNOPSIS:¶ ↑

• Like any Deferrable eventmachine-based protocol implementation, using EM-Redis involves making calls and passing blocks that serve as callbacks when

the call returns.

require 'em-redis'

EM.run do
  redis = EM::Protocol::Redis.connect
  error_callback = lambda {|code| puts "Error code: #{code}" }
  redis.on_error error_callback
  redis.set "a", "foo" do |response|
    redis.get "a" do |response|
      puts response
    end
  end
end

• To run live tests on a Redis server (currently compatible with 0.91)

  rake redis:live_test

• To run a test of the underlying protocol implemention

  rake redis:offline_test

Because the EM::Protocol::Memcached code used Bacon for testing, test code is currently in the form of bacon specs. I’ll port them to RSpec at some point.

REQUIREMENTS:¶ ↑

• Redis (download)

INSTALL:¶ ↑

• sudo gem install madsimian-em-redis –source gems.github.com

LICENSE:¶ ↑

(The MIT License)

Copyright © 2008

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ‘AS IS’, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

CREDIT¶ ↑

by Jonathan Broad (http://www.relativepath.org)