fix: restore (*OffsetCommitRequest) AddBlock func

In v1.34.0 a breaking API change to (*OffsetCommitRequest) AddBlock was
inadvertently introduced by 59a3d39
We weren't aware that anyone was driving the offset commit protocol
directly via the broker.go call rather than via offset_manager.go (or
via a consumer client)

For now we restore the old AddBlock signature and move the new one to
AddBlockWithLeaderEpoch. This will unfortunately impact anyone who had
updated their own code to call the new func signature, but it's probably
more important that we restore the longer term backwards compatibility
now until we move to a v2 release.

Fixes #2358

Signed-off-by: Dominic Evans <dominic.evans@uk.ibm.com>

offset_commit_request.go

@@ -220,7 +220,11 @@ func (r *OffsetCommitRequest) requiredVersion() KafkaVersion {
 	}
 }
 
-func (r *OffsetCommitRequest) AddBlock(topic string, partitionID int32, offset int64, leaderEpoch int32, timestamp int64, metadata string) {
+func (r *OffsetCommitRequest) AddBlock(topic string, partitionID int32, offset int64, timestamp int64, metadata string) {
+	r.AddBlockWithLeaderEpoch(topic, partitionID, offset, 0, timestamp, metadata)
+}
+
+func (r *OffsetCommitRequest) AddBlockWithLeaderEpoch(topic string, partitionID int32, offset int64, leaderEpoch int32, timestamp int64, metadata string) {
 	if r.blocks == nil {
 		r.blocks = make(map[string]map[int32]*offsetCommitRequestBlock)
 	}

offset_commit_request_test.go

@@ -70,7 +70,7 @@ func TestOffsetCommitRequestV0(t *testing.T) {
 	request.ConsumerGroup = "foobar"
 	testRequest(t, "no blocks v0", request, offsetCommitRequestNoBlocksV0)
 
-	request.AddBlock("topic", 0x5221, 0xDEADBEEF, 0, 0, "metadata")
+	request.AddBlock("topic", 0x5221, 0xDEADBEEF, 0, "metadata")
 	testRequest(t, "one block v0", request, offsetCommitRequestOneBlockV0)
 }
 
@@ -82,7 +82,7 @@ func TestOffsetCommitRequestV1(t *testing.T) {
 	request.Version = 1
 	testRequest(t, "no blocks v1", request, offsetCommitRequestNoBlocksV1)
 
-	request.AddBlock("topic", 0x5221, 0xDEADBEEF, 0, ReceiveTime, "metadata")
+	request.AddBlock("topic", 0x5221, 0xDEADBEEF, ReceiveTime, "metadata")
 	testRequest(t, "one block v1", request, offsetCommitRequestOneBlockV1)
 }
 
@@ -96,7 +96,7 @@ func TestOffsetCommitRequestV2ToV4(t *testing.T) {
 		request.Version = int16(version)
 		testRequest(t, fmt.Sprintf("no blocks v%d", version), request, offsetCommitRequestNoBlocksV2)
 
-		request.AddBlock("topic", 0x5221, 0xDEADBEEF, 0, 0, "metadata")
+		request.AddBlock("topic", 0x5221, 0xDEADBEEF, 0, "metadata")
 		testRequest(t, fmt.Sprintf("one block v%d", version), request, offsetCommitRequestOneBlockV2)
 	}
 }

offset_manager.go

@@ -304,7 +304,7 @@ func (om *offsetManager) constructRequest() *OffsetCommitRequest {
 		for _, pom := range topicManagers {
 			pom.lock.Lock()
 			if pom.dirty {
-				r.AddBlock(pom.topic, pom.partition, pom.offset, pom.leaderEpoch, perPartitionTimestamp, pom.metadata)
+				r.AddBlockWithLeaderEpoch(pom.topic, pom.partition, pom.offset, pom.leaderEpoch, perPartitionTimestamp, pom.metadata)
 			}
 			pom.lock.Unlock()
 		}