Extract API number to a constant

Author: dasch

lib/kafka/protocol.rb

@@ -24,6 +24,7 @@ module Protocol
     LEAVE_GROUP_API = 13
     SYNC_GROUP_API = 14
     SASL_HANDSHAKE_API = 17
+    API_VERSIONS_API = 18
     CREATE_TOPICS_API = 19
 
     # A mapping from numeric API keys to symbolic API names.
@@ -40,6 +41,7 @@ module Protocol
       LEAVE_GROUP_API => :leave_group,
       SYNC_GROUP_API => :sync_group,
       SASL_HANDSHAKE_API => :sasl_handshake,
+      API_VERSIONS_API => :api_versions,
       CREATE_TOPICS_API => :create_topics,
     }
 

lib/kafka/protocol/api_versions_request.rb

@@ -3,7 +3,7 @@ module Protocol
 
     class ApiVersionsRequest
       def api_key
-        18
+        API_VERSIONS_API
       end
 
       def encode(encoder)