AO3-6706 Support Sentinel config for Redis clients (#4787)

* AO3-6706 Support Sentinel config for Redis clients

* Fix examples

config/initializers/gem-plugin_config/redis.rb

@@ -1,22 +1,34 @@
-require 'redis_test_setup'
-include RedisTestSetup
+require "redis_test_setup"
+include RedisTestSetup # rubocop:disable Style/MixinUsage
 
-rails_root = ENV["RAILS_ROOT"] || File.dirname(__FILE__) + "/../../.."
-rails_env = ENV["RAILS_ENV"] || "development"
+rails_root = ENV["RAILS_ROOT"] || "#{File.dirname(__FILE__)}/../../.."
+rails_env = (ENV["RAILS_ENV"] || "development").to_sym
 
-unless ENV["CI"]
-  if rails_env == "test" && !ENV["DOCKER"]
-    # https://gist.github.com/441072
-    start_redis!(rails_root, :cucumber)
-  end
-end
+# https://gist.github.com/441072
+start_redis!(rails_root, :cucumber) if rails_env == "test" && !(ENV["CI"] || ENV["DOCKER"])
 
-redis_configs = YAML.load_file(rails_root + '/config/redis.yml')
+redis_configs = YAML.load_file("#{rails_root}/config/redis.yml", symbolize_names: true)
 redis_configs.each_pair do |name, redis_config|
-  redis_host, redis_port = redis_config[rails_env].split(":")
-  redis_connection = Redis.new(host: redis_host, port: redis_port)
-  if ENV['DEV_USER']
-    namespaced_redis = Redis::Namespace.new(ENV['DEV_USER'], redis: redis_connection)
+  redis_options = {}
+  if redis_config[rails_env].is_a?(Hash)
+    # example:
+    # redis_kudos:
+    #   development
+    #     name: redis_kudos
+    #     sentinels:
+    #       - host: 127.0.0.1
+    #         port: 26379
+    #       - host: 127.0.0.1
+    #         port: 26380
+    redis_options = redis_config[rails_env]
+  else
+    redis_host, redis_port = redis_config[rails_env].split(":")
+    redis_options[:host] = redis_host
+    redis_options[:port] = redis_port
+  end
+  redis_connection = Redis.new(redis_options)
+  if ENV["DEV_USER"]
+    namespaced_redis = Redis::Namespace.new(ENV["DEV_USER"], redis: redis_connection)
     redis_connection = namespaced_redis
   end
   Object.const_set(name.upcase, redis_connection)

config/initializers/gem-plugin_config/resque.rb

@@ -1,14 +1,14 @@
-require 'resque'
+require "resque"
 
-rails_root = ENV["RAILS_ROOT"] || File.dirname(__FILE__) + "/../../.."
-rails_env = ENV["RAILS_ENV"] || "development"
+rails_root = ENV["RAILS_ROOT"] || "#{File.dirname(__FILE__)}/../../.."
+rails_env = (ENV["RAILS_ENV"] || "development").to_sym
 
- redis_configs = YAML.load_file(rails_root + '/config/redis.yml')
- Resque.redis = redis_configs['redis_resque'][rails_env]
+redis_configs = YAML.load_file("#{rails_root}/config/redis.yml", symbolize_names: true)
+Resque.redis = redis_configs[:redis_resque][rails_env]
 
- # in-process performing of jobs (for testing) doesn't require a redis server
- Resque.inline = ENV['RAILS_ENV'] == "test"
+# in-process performing of jobs (for testing) doesn't require a redis server
+Resque.inline = ENV["RAILS_ENV"] == "test"
 
- Resque.after_fork do
-   Resque.redis.client.reconnect
- end
+Resque.after_fork do
+  Resque.redis.client.reconnect
+end