Small refactor in Redis class and improved specs

lib/gitlab/redis.rb

@@ -19,7 +19,7 @@ module Gitlab
 
     class << self
       def params
-        PARAMS_MUTEX.synchronize { new.params }
+        @params || PARAMS_MUTEX.synchronize { @params = new.params }
       end
 
       # @deprecated Use .params instead to get sentinel support
@@ -35,6 +35,10 @@ module Gitlab
         end
         @pool.with { |redis| yield redis }
       end
+
+      def reset_params!
+        @params = nil
+      end
     end
 
     def initialize(rails_env = nil)

spec/fixtures/config/redis_new_format_host.yml

 # redis://[:password@]host[:port][/db-number][?option=value]
 # more details: http://www.iana.org/assignments/uri-schemes/prov/redis
 development:
-  url: redis://:mypassword@localhost:6379/99
+  url: redis://:mynewpassword@localhost:6379/99
   sentinels:
     -
       host: localhost
@@ -10,7 +10,7 @@ development:
       host: slave2
       port: 26381 # point to sentinel, not to redis port
 test:
-  url: redis://:mypassword@localhost:6379/99
+  url: redis://:mynewpassword@localhost:6379/99
   sentinels:
     -
       host: localhost
@@ -19,7 +19,7 @@ test:
       host: slave2
       port: 26381 # point to sentinel, not to redis port
 production:
-  url: redis://:mypassword@localhost:6379/99
+  url: redis://:mynewpassword@localhost:6379/99
   sentinels:
     -
       host: slave1

spec/fixtures/config/redis_old_format_socket.yml

-development: unix:/path/to/redis.sock
-test: unix:/path/to/redis.sock
-production: unix:/path/to/redis.sock
+development: unix:/path/to/old/redis.sock
+test: unix:/path/to/old/redis.sock
+production: unix:/path/to/old/redis.sock

spec/lib/gitlab/redis_spec.rb

@@ -3,6 +3,9 @@ require 'spec_helper'
 describe Gitlab::Redis do
   let(:redis_config) { Rails.root.join('config', 'resque.yml').to_s }
 
+  before(:each) { described_class.reset_params! }
+  after(:each) { described_class.reset_params! }
+
   describe '.params' do
     subject { described_class.params }
 
@@ -14,7 +17,7 @@ describe Gitlab::Redis do
         it 'returns path key instead' do
           expect_any_instance_of(described_class).to receive(:config_file) { config_old }
 
-          is_expected.to include(path: '/path/to/redis.sock')
+          is_expected.to include(path: '/path/to/old/redis.sock')
           is_expected.not_to have_key(:url)
         end
       end
@@ -46,7 +49,7 @@ describe Gitlab::Redis do
         it 'returns hash with host, port, db, and password' do
           expect_any_instance_of(described_class).to receive(:config_file) { config_new }
 
-          is_expected.to include(host: 'localhost', password: 'mypassword', port: 6379, db: 99)
+          is_expected.to include(host: 'localhost', password: 'mynewpassword', port: 6379, db: 99)
           is_expected.not_to have_key(:url)
         end
       end