chore: refactor redis config (#1310)

- refactor Redis config in Redis::Config Module
-  unit tests for Redis::Config module

config/initializers/redis.rb

@@ -1,24 +1,5 @@
-app_redis_config = {
-  url: URI.parse(ENV.fetch('REDIS_URL', 'redis://127.0.0.1:6379')),
-  password: ENV.fetch('REDIS_PASSWORD', nil).presence
-}
+redis = Rails.env.test? ? MockRedis.new : Redis.new(Redis::Config.app)
 
-if ENV['REDIS_SENTINELS'].presence
-  default_sentinel_port = '26379'
-  # expected format for REDIS_SENTINELS url string is host1:port1, host2:port2
-  sentinels = ENV['REDIS_SENTINELS'].split(',').map do |sentinel_url|
-    host, port = sentinel_url.split(':').map(&:strip)
-    { host: host, port: port || default_sentinel_port, password: app_redis_config[:password] }
-  end
-
-  master_name = ENV.fetch('REDIS_SENTINEL_MASTER_NAME', 'mymaster')
-  # over-write redis url as redis://:<your-redis-password>@<master-name>/ when using sentinel
-  # more at https://github.com/redis/redis-rb/issues/531#issuecomment-263501322
-  app_redis_config[:url] = URI.parse("redis://#{master_name}")
-  app_redis_config[:sentinels] = sentinels
-end
-
-redis = Rails.env.test? ? MockRedis.new : Redis.new(app_redis_config)
 # Alfred
 # Add here as you use it for more features
 # Used for Round Robin, Conversation Emails & Online Presence

config/initializers/sidekiq.rb

@@ -1,12 +1,7 @@
-sidekiq_redis_config = {
-  url: ENV.fetch('REDIS_URL', 'redis://127.0.0.1:6379'),
-  password: ENV.fetch('REDIS_PASSWORD', nil).presence
-}
-
 Sidekiq.configure_client do |config|
-  config.redis = sidekiq_redis_config.merge(size: 25)
+  config.redis = Redis::Config.sidekiq
 end
 
 Sidekiq.configure_server do |config|
-  config.redis = sidekiq_redis_config.merge(size: 25)
+  config.redis = Redis::Config.sidekiq
 end