Add realtime config

Author: zachaysan

lib/flagsmith/sdk/config.rb

@@ -4,10 +4,13 @@ module Flagsmith
   # Config options shared around Engine
   class Config
     DEFAULT_API_URL = 'https://edge.api.flagsmith.com/api/v1/'
+    DEFAULT_REALTIME_API_URL = 'https://realtime.flagsmith.com/'
+
     OPTIONS = %i[
       environment_key api_url custom_headers request_timeout_seconds enable_local_evaluation
       environment_refresh_interval_seconds retries enable_analytics default_flag_handler
-      offline_mode offline_handler polling_manager_failure_limit logger
+      offline_mode offline_handler polling_manager_failure_limit
+      realtime_api_url enable_realtime_updates logger
     ].freeze
 
     # Available Configs
@@ -40,6 +43,9 @@ class Config
     #                                            the entire environment, project, flags, etc.
     #   +polling_manager_failure_limit+        - An integer to control how long to suppress errors in
     #                                            the polling manager for local evaluation mode.
+    #   +realtime_api_url+                     - Override the realtime api URL to communicate with a
+    #                                            non-standard realtime endpoint.
+    #   +enable_realtime_updates+              - A boolean to enable realtime updates.
     #   +logger+                               - Pass your logger, default is Logger.new($stdout)
     #
     attr_reader(*OPTIONS)
@@ -62,6 +68,10 @@ def offline_mode?
       @offline_mode
     end
 
+    def realtime_mode?
+      @enable_realtime_updates
+    end
+
     def environment_flags_url
       'flags/'
     end
@@ -92,6 +102,9 @@ def build_config(options)
       @offline_mode = opts.fetch(:offline_mode, false)
       @offline_handler = opts[:offline_handler]
       @polling_manager_failure_limit = opts.fetch(:polling_manager_failure_limit, 10)
+      @realtime_api_url = opts.fetch(:realtime_api_url, Flagsmith::Config::DEFAULT_REALTIME_API_URL)
+      @realtime_api_url << '/' unless @realtime_api_url.end_with? '/'
+      @enable_realtime_updates = opts.fetch(:enable_realtime_updates, false)
       @logger = options.fetch(:logger, Logger.new($stdout).tap { |l| l.level = :debug })
     end
     # rubocop:enable Metrics/AbcSize, Metrics/MethodLength