Refactor (ruby) redis configuration (#31694)

app/lib/redis_connection.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+class RedisConnection
+  class << self
+    def establish_pool(new_pool_size)
+      @pool&.shutdown(&:close)
+      @pool = ConnectionPool.new(size: new_pool_size) { new.connection }
+    end
+
+    delegate :with, to: :pool
+
+    def pool
+      @pool ||= establish_pool(pool_size)
+    end
+
+    def pool_size
+      if Sidekiq.server?
+        Sidekiq[:concurrency]
+      else
+        ENV['MAX_THREADS'] || 5
+      end
+    end
+  end
+
+  attr_reader :config
+
+  def initialize
+    @config = REDIS_CONFIGURATION.base
+  end
+
+  def connection
+    namespace = config[:namespace]
+    if namespace.present?
+      Redis::Namespace.new(namespace, redis: raw_connection)
+    else
+      raw_connection
+    end
+  end
+
+  private
+
+  def raw_connection
+    Redis.new(**config)
+  end
+end