Restructure omni services and add Chatwoot research snapshot

research/chatwoot/lib/redis/config.rb

@@ -0,0 +1,49 @@
+module Redis::Config
+  DEFAULT_SENTINEL_PORT ||= '26379'.freeze
+  class << self
+    def app
+      config
+    end
+
+    def config
+      @config ||= sentinel? ? sentinel_config : base_config
+    end
+
+    def base_config
+      {
+        url: ENV.fetch('REDIS_URL', 'redis://127.0.0.1:6379'),
+        password: ENV.fetch('REDIS_PASSWORD', nil).presence,
+        ssl_params: { verify_mode: Chatwoot.redis_ssl_verify_mode },
+        reconnect_attempts: 2,
+        timeout: 1
+      }
+    end
+
+    def sentinel?
+      ENV.fetch('REDIS_SENTINELS', nil).presence
+    end
+
+    def sentinel_url_config(sentinel_url)
+      host, port = sentinel_url.split(':').map(&:strip)
+      sentinel_url_config = { host: host, port: port || DEFAULT_SENTINEL_PORT }
+      password = ENV.fetch('REDIS_SENTINEL_PASSWORD', base_config[:password])
+      sentinel_url_config[:password] = password if password.present?
+      sentinel_url_config
+    end
+
+    def sentinel_config
+      redis_sentinels = ENV.fetch('REDIS_SENTINELS', nil)
+
+      # expected format for REDIS_SENTINELS url string is host1:port1, host2:port2
+      sentinels = redis_sentinels.split(',').map do |sentinel_url|
+        sentinel_url_config(sentinel_url)
+      end
+
+      # 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
+      master = "redis://#{ENV.fetch('REDIS_SENTINEL_MASTER_NAME', 'mymaster')}"
+
+      base_config.merge({ url: master, sentinels: sentinels })
+    end
+  end
+end