Use Struct aliases for backwards compatibility (#2741)

* kafka.protocol.struct ALIASES

* old proto ApiVersionsResponse ALIASES

* old proto SaslHandshakeResponse ALIASES

* old proto Fetch ALIASES

* old proto ListOffsets internal field renames

* old proto FindCoordinator ALIASES

* old proto JoinGroup/SyncGroup ALIASES

* old proto OffsetCommit/OffsetFetch ALIASES

* old proto Admin api ALIASES

* old proto producer message ALIASES

* Fixup AddPartitionsToTxnRequest topics alias

Author: dpkp

kafka/protocol/add_partitions_to_txn.py

@@ -7,47 +7,60 @@ class AddPartitionsToTxnResponse_v0(Response):
     API_VERSION = 0
     SCHEMA = Schema(
         ('throttle_time_ms', Int32),
-        ('results', Array(
-            ('topic', String('utf-8')),
-            ('partitions', Array(
-                ('partition', Int32),
-                ('error_code', Int16))))))
+        ('results_by_topic_v3_and_below', Array(
+            ('name', String('utf-8')),
+            ('results_by_partition', Array(
+                ('partition_index', Int32),
+                ('partition_error_code', Int16))))))
+    ALIASES = {
+        'results': 'results_by_topic_v3_and_below',
+    }
 
 
 class AddPartitionsToTxnResponse_v1(Response):
     API_KEY = 24
     API_VERSION = 1
     SCHEMA = AddPartitionsToTxnResponse_v0.SCHEMA
+    ALIASES = AddPartitionsToTxnResponse_v0.ALIASES
 
 
 class AddPartitionsToTxnResponse_v2(Response):
     API_KEY = 24
     API_VERSION = 2
     SCHEMA = AddPartitionsToTxnResponse_v1.SCHEMA
+    ALIASES = AddPartitionsToTxnResponse_v1.ALIASES
 
 
 class AddPartitionsToTxnRequest_v0(Request):
     API_KEY = 24
     API_VERSION = 0
     SCHEMA = Schema(
-        ('transactional_id', String('utf-8')),
-        ('producer_id', Int64),
-        ('producer_epoch', Int16),
-        ('topics', Array(
-            ('topic', String('utf-8')),
+        ('v3_and_below_transactional_id', String('utf-8')),
+        ('v3_and_below_producer_id', Int64),
+        ('v3_and_below_producer_epoch', Int16),
+        ('v3_and_below_topics', Array(
+            ('name', String('utf-8')),
             ('partitions', Array(Int32)))))
+    ALIASES = {
+        'transactional_id': 'v3_and_below_transactional_id',
+        'producer_id': 'v3_and_below_producer_id',
+        'producer_epoch': 'v3_and_below_producer_epoch',
+        'topics': 'v3_and_below_topics',
+    }
 
 
 class AddPartitionsToTxnRequest_v1(Request):
     API_KEY = 24
     API_VERSION = 1
     SCHEMA = AddPartitionsToTxnRequest_v0.SCHEMA
+    ALIASES = AddPartitionsToTxnRequest_v0.ALIASES
 
 
 class AddPartitionsToTxnRequest_v2(Request):
     API_KEY = 24
     API_VERSION = 2
     SCHEMA = AddPartitionsToTxnRequest_v1.SCHEMA
+    ALIASES = AddPartitionsToTxnRequest_v1.ALIASES
 
 
 AddPartitionsToTxnRequest = [