Initial commit. And it works!

.gitignore

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+pkg

LICENSE

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+Copyright (c) 2009 Mathias Meyer
+
+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.

Rakefile

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+require 'rubygems'
+require 'rake/gempackagetask'
+require 'rubygems/specification'
+
+spec = Gem::Specification.new do |s|
+  s.name = 'redis-session-store'
+  s.version = '0.1'
+  s.platform = Gem::Platform::RUBY
+  s.has_rdoc = true
+  s.extra_rdoc_files = ["LICENSE"]
+  s.summary = "A drop-in replacement for e.g. MemCacheStore to store Rails sessions (and Rails sessions only) in Redis."
+  s.description = s.summary
+  s.authors = "Mathias Meyer"
+  s.email = "meyer@paperplanes.de"
+  s.homepage = ""
+  s.add_dependency "redis"
+  s.require_path = 'lib'
+  s.autorequire = 'redis_session_store'
+  s.files = %w(README Rakefile) + Dir.glob("{lib}/**/*")
+end
+
+Rake::GemPackageTask.new(spec) do |pkg|
+  pkg.gem_spec = spec
+end

lib/redis_session_store.rb

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+require 'redis'
+
+# Redis session storage for Rails, and for Rails only. Derived from
+# the MemCacheStore code, simply dropping in Redis instead.
+#
+# Options:
+#  :key     => Same as with the other cookie stores, key name
+#  :secret  => Encryption secret for the key
+#  :host    => Redis host name, default is localhost
+#  :port    => Redis port, default is 6370
+#  :db      => Database number, defaults to 0. Useful to separate your session storage from other data
+#  :key_prefix  => Prefix for keys used in Redis, e.g. myapp-. Useful to separate session storage keys visibly from others.
+
+class RedisSessionStore < ActionController::Session::AbstractStore
+
+  def initialize(app, options = {})
+    # Support old :expires option
+    options[:expire_after] ||= options[:expires]
+
+    super
+
+    @default_options = {
+      :namespace => 'rack:session',
+      :server => 'localhost',
+      :port => '6379',
+      :db => 0,
+      :key_prefix => ""
+    }.update(options)
+
+    @pool = Redis.new(@default_options)
+    @mutex = Mutex.new
+
+    super
+  end
+
+  private
+    def prefixed(sid)
+      "#{@default_options[:key_prefix]}#{sid}"
+    end
+
+    def get_session(env, sid)
+      sid ||= generate_sid
+      begin
+        data = @pool.call_command([:get, prefixed(sid)])
+        session = data.nil? ? {} : Marshal.load(data)
+      rescue Errno::ECONNREFUSED
+        session = {}
+      end
+      [sid, session]
+    end
+
+    def set_session(env, sid, session_data)
+      options = env['rack.session.options']
+      expiry  = options[:expire_after] || nil
+      @pool.set(prefixed(sid), Marshal.dump(session_data), expiry)
+      return true
+    rescue Errno::ECONNREFUSED
+      return false
+    end
+
+end