[Refactor] refactor duplicated code lines and fix typo errors (#1039)

* [Refactor] refactor duplicated code lines and fix typo errors

* [typo] revert

* [typo] revert

* [typo] revert

* [refactor] delete redunpdant code lines

* [typo] revert some words

* [fix] set useTxn when use transaction

---------

Co-authored-by: gunli <[email protected]>

Author: gunli

pulsar/producer_partition.go

@@ -710,17 +710,19 @@ func addRequestToBatch(smm *pb.SingleMessageMetadata, p *partitionProducer,
 	uncompressedPayload []byte,
 	request *sendRequest, msg *ProducerMessage, deliverAt time.Time,
 	schemaVersion []byte, multiSchemaEnabled bool) bool {
-	var ok bool
+	var useTxn bool
+	var mostSigBits uint64
+	var leastSigBits uint64
 	if request.transaction != nil {
 		txnID := request.transaction.GetTxnID()
-		ok = p.batchBuilder.Add(smm, p.sequenceIDGenerator, uncompressedPayload, request,
-			msg.ReplicationClusters, deliverAt, schemaVersion, multiSchemaEnabled, true, txnID.MostSigBits,
-			txnID.LeastSigBits)
-	} else {
-		ok = p.batchBuilder.Add(smm, p.sequenceIDGenerator, uncompressedPayload, request,
-			msg.ReplicationClusters, deliverAt, schemaVersion, multiSchemaEnabled, false, 0, 0)
+		useTxn = true
+		mostSigBits = txnID.MostSigBits
+		leastSigBits = txnID.LeastSigBits
 	}
-	return ok
+
+	return p.batchBuilder.Add(smm, p.sequenceIDGenerator, uncompressedPayload, request,
+		msg.ReplicationClusters, deliverAt, schemaVersion, multiSchemaEnabled, useTxn, mostSigBits,
+		leastSigBits)
 }
 
 func (p *partitionProducer) genMetadata(msg *ProducerMessage,
@@ -764,6 +766,14 @@ func (p *partitionProducer) updateMetadataSeqID(mm *pb.MessageMetadata, msg *Pro
 	}
 }
 
+func (p *partitionProducer) updateSingleMessageMetadataSeqID(smm *pb.SingleMessageMetadata, msg *ProducerMessage) {
+	if msg.SequenceID != nil {
+		smm.SequenceId = proto.Uint64(uint64(*msg.SequenceID))
+	} else {
+		smm.SequenceId = proto.Uint64(internal.GetAndAdd(p.sequenceIDGenerator, 1))
+	}
+}
+
 func (p *partitionProducer) genSingleMessageMetadataInBatch(msg *ProducerMessage,
 	uncompressedSize int) (smm *pb.SingleMessageMetadata) {
 	smm = &pb.SingleMessageMetadata{
@@ -786,14 +796,7 @@ func (p *partitionProducer) genSingleMessageMetadataInBatch(msg *ProducerMessage
 		smm.Properties = internal.ConvertFromStringMap(msg.Properties)
 	}
 
-	var sequenceID uint64
-	if msg.SequenceID != nil {
-		sequenceID = uint64(*msg.SequenceID)
-	} else {
-		sequenceID = internal.GetAndAdd(p.sequenceIDGenerator, 1)
-	}
-
-	smm.SequenceId = proto.Uint64(sequenceID)
+	p.updateSingleMessageMetadataSeqID(smm, msg)
 
 	return
 }
@@ -813,35 +816,30 @@ func (p *partitionProducer) internalSingleSend(mm *pb.MessageMetadata,
 	}
 
 	sid := *mm.SequenceId
-	var err error
+	var useTxn bool
+	var mostSigBits uint64
+	var leastSigBits uint64
+
 	if request.transaction != nil {
 		txnID := request.transaction.GetTxnID()
-		err = internal.SingleSend(
-			buffer,
-			p.producerID,
-			sid,
-			mm,
-			payloadBuf,
-			p.encryptor,
-			maxMessageSize,
-			true,
-			txnID.MostSigBits,
-			txnID.LeastSigBits,
-		)
-	} else {
-		err = internal.SingleSend(
-			buffer,
-			p.producerID,
-			sid,
-			mm,
-			payloadBuf,
-			p.encryptor,
-			maxMessageSize,
-			false,
-			0,
-			0,
-		)
-	}
+		useTxn = true
+		mostSigBits = txnID.MostSigBits
+		leastSigBits = txnID.LeastSigBits
+	}
+
+	err := internal.SingleSend(
+		buffer,
+		p.producerID,
+		sid,
+		mm,
+		payloadBuf,
+		p.encryptor,
+		maxMessageSize,
+		useTxn,
+		mostSigBits,
+		leastSigBits,
+	)
+
 	if err != nil {
 		runCallback(request.callback, nil, request.msg, err)
 		p.releaseSemaphoreAndMem(int64(len(msg.Payload)))
@@ -1001,7 +999,7 @@ func (p *partitionProducer) failTimeoutMessages() {
 				}
 			}
 
-			// flag the send has completed with error, flush make no effect
+			// flag the sending has completed with error, flush make no effect
 			pi.Complete()
 			pi.Unlock()
 
@@ -1116,8 +1114,10 @@ func (p *partitionProducer) internalSendAsync(ctx context.Context, msg *Producer
 	callback func(MessageID, *ProducerMessage, error), flushImmediately bool) {
 	// Register transaction operation to transaction and the transaction coordinator.
 	var newCallback func(MessageID, *ProducerMessage, error)
+	var txn *transaction
 	if msg.Transaction != nil {
 		transactionImpl := (msg.Transaction).(*transaction)
+		txn = transactionImpl
 		if transactionImpl.state != TxnOpen {
 			p.log.WithField("state", transactionImpl.state).Error("Failed to send message" +
 				" by a non-open transaction.")
@@ -1150,10 +1150,6 @@ func (p *partitionProducer) internalSendAsync(ctx context.Context, msg *Producer
 
 	// callbackOnce make sure the callback is only invoked once in chunking
 	callbackOnce := &sync.Once{}
-	var txn *transaction
-	if msg.Transaction != nil {
-		txn = (msg.Transaction).(*transaction)
-	}
 	sr := &sendRequest{
 		ctx:              ctx,
 		msg:              msg,
@@ -1398,7 +1394,7 @@ func (p *partitionProducer) _setConn(conn internal.Connection) {
 // _getConn returns internal connection field of this partition producer atomically.
 // Note: should only be called by this partition producer before attempting to use the connection
 func (p *partitionProducer) _getConn() internal.Connection {
-	// Invariant: The conn must be non-nill for the lifetime of the partitionProducer.
+	// Invariant: The conn must be non-nil for the lifetime of the partitionProducer.
 	//            For this reason we leave this cast unchecked and panic() if the
 	//            invariant is broken
 	return p.conn.Load().(internal.Connection)