Correctly support redis namespace

Rakefile

@@ -2,4 +2,11 @@ require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 
 RSpec::Core::RakeTask.new
-task default: :spec
+
+task :default do
+  rspec = Rake::Task[:spec]
+  rspec.invoke
+  ENV['namespace'] = 'namespace'
+  rspec.reenable
+  rspec.invoke
+end

lib/sidekiq/limit_fetch.rb

@@ -21,7 +21,7 @@ class Sidekiq::LimitFetch
 
   def initialize(options)
     Global::Monitor.start!
-    @queues = Queues.new options
+    @queues = Queues.new options.merge(namespace: determine_namespace)
   end
 
   def retrieve_work
@@ -39,6 +39,6 @@ class Sidekiq::LimitFetch
 
   def redis_brpop(*args)
     return if args.size < 2
-    redis {|it| it.brpop *args }
+    nonblocking_redis {|it| it.brpop *args }
   end
 end

lib/sidekiq/limit_fetch/global/selector.rb

@@ -2,11 +2,11 @@ module Sidekiq::LimitFetch::Global
   module Selector
     extend self
 
-    def acquire(queues)
+    def acquire(queues, namespace)
       redis_eval :acquire, [namespace, uuid, queues]
     end
 
-    def release(queues)
+    def release(queues, namespace)
       redis_eval :release, [namespace, uuid, queues]
     end
 
@@ -22,13 +22,6 @@ module Sidekiq::LimitFetch::Global
 
     private
 
-    def namespace
-      @namespace ||= begin
-        namespace = Sidekiq.options[:namespace]
-        namespace + ':' if namespace
-      end
-    end
-
     def redis_eval(script_name, args)
       Sidekiq.redis do |it|
         begin

lib/sidekiq/limit_fetch/global/semaphore.rb

@@ -1,7 +1,6 @@
 module Sidekiq::LimitFetch::Global
   class Semaphore
-    extend Forwardable
-    def_delegator Sidekiq, :redis
+    include Sidekiq::LimitFetch::Redis
 
     PREFIX = 'limit_fetch'
 
@@ -19,7 +18,7 @@ module Sidekiq::LimitFetch::Global
     end
 
     def acquire
-      Selector.acquire([@name]).size > 0
+      Selector.acquire([@name], determine_namespace).size > 0
     end
 
     def release

lib/sidekiq/limit_fetch/queues.rb

@@ -4,6 +4,8 @@ class Sidekiq::LimitFetch
 
     def initialize(options)
       @queues    = options[:queues]
+      @namespace = options[:namespace]
+
       options[:strict] ? strict_order! : weighted_order!
 
       set_limits options[:limits]
@@ -11,7 +13,7 @@ class Sidekiq::LimitFetch
     end
 
     def acquire
-      selector.acquire(ordered_queues)
+      selector.acquire(ordered_queues, @namespace)
         .tap {|it| save it }
         .map {|it| "queue:#{it}" }
     end
@@ -19,7 +21,7 @@ class Sidekiq::LimitFetch
     def release_except(full_name)
       queues = restore
       queues.delete full_name[/queue:(.*)/, 1] if full_name
-      selector.release queues
+      selector.release queues, @namespace
     end
 
     private

lib/sidekiq/limit_fetch/redis.rb

@@ -1,13 +1,27 @@
 module Sidekiq::LimitFetch::Redis
+  extend self
+
   # prevent blocking of fetcher
   # more bullet-proof and faster (O_O)
   # than using Celluloid::IO
-  def redis
-    Sidekiq.redis do |redis|
+  def nonblocking_redis
+    redis do |redis|
       begin
         Celluloid::Future.new { yield redis }.value
       end
     end
   rescue Celluloid::Task::TerminatedError
   end
+
+  def redis
+    Sidekiq.redis {|it| yield it }
+  end
+
+  def determine_namespace
+    redis do |it|
+      if it.respond_to?(:namespace) and it.namespace
+        it.namespace + ':'
+      end
+    end
+  end
 end

spec/sidekiq/limit_fetch/queues_spec.rb

@@ -12,7 +12,8 @@ describe Sidekiq::LimitFetch::Queues do
     { queues:   queues,
       limits:   limits,
       strict:   strict,
-      blocking: blocking }
+      blocking: blocking,
+      namespace: Sidekiq::LimitFetch::Redis.determine_namespace }
   end
 
   it 'should acquire queues' do

spec/spec_helper.rb

@@ -2,6 +2,9 @@ require 'sidekiq/limit_fetch'
 require 'celluloid/autostart'
 require 'sidekiq/fetch'
 
+Sidekiq.logger = nil
+Sidekiq.redis = { namespace: ENV['namespace'] }
+
 RSpec.configure do |config|
   config.before :each do
     Sidekiq.redis do |it|