chore: Add redis persistent test support

Author: keelerm84

contract-tests/Gemfile

@@ -11,3 +11,6 @@ gem 'json'
 gem 'rubocop', '~> 1.37', group: 'development'
 gem 'rubocop-performance', '~> 1.15', group: 'development'
 gem 'thin', :platforms => :ruby
+
+gem "redis", "~> 5.3"
+gem "connection_pool", "~> 2.4"

contract-tests/client_entity.rb

@@ -25,6 +25,31 @@ def initialize(log, config)
       opts[:base_uri] = polling[:baseUri] unless polling[:baseUri].nil?
       opts[:payload_filter_key] = polling[:filter] unless polling[:filter].nil?
       opts[:poll_interval] = polling[:pollIntervalMs] / 1_000.0 unless polling[:pollIntervalMs].nil?
+    else
+      opts[:use_ldd] = true
+    end
+
+    if config[:persistentDataStore]
+      store_config = {}
+      store_config[:prefix] = config[:persistentDataStore][:store][:prefix] if config[:persistentDataStore][:store][:prefix]
+
+      case config[:persistentDataStore][:cache][:mode]
+        when 'off'
+          store_config[:expiration] = 0
+        when 'infinite'
+          # NOTE: We don't actually support infinite cache mode, so we'll just set it to nil for now. This uses a default
+          # 15 second expiration time in the SDK, which is long enough to pass any test.
+          store_config[:expiration] = nil
+        when 'ttl'
+          store_config[:expiration] = config[:persistentDataStore][:cache][:ttl]
+      end
+
+      case config[:persistentDataStore][:store][:type]
+      when 'redis'
+        store_config[:redis_url] = config[:persistentDataStore][:store][:dsn]
+        store = LaunchDarkly::Integrations::Redis.new_feature_store(store_config)
+        opts[:feature_store] = store
+      end
     end
 
     if config[:events]

contract-tests/service.rb

@@ -45,6 +45,7 @@
       'evaluation-hooks',
       'omit-anonymous-contexts',
       'client-prereq-events',
+      'persistent-data-store-redis',
     ],
   }.to_json
 end