[fix] fix the client crash when the transaction coordinator not found

pulsar/error.go

@@ -121,6 +121,11 @@ const (
 	// fenced. Applications are now supposed to close it and create a
 	// new producer
 	ProducerFenced
+	// TransactionCoordinatorNotEnabled indicates that the transaction coordinator is not enabled.
+	// This error is returned when an operation that requires the transaction coordinator is attempted
+	// but the transaction coordinator feature is not enabled in the system or the transaction coordinator
+	// has not initialized
+	TransactionCoordinatorNotEnabled
 )
 
 // Error implement error interface, composed of two parts: msg and result.

pulsar/transaction_coordinator_client.go

@@ -41,6 +41,9 @@ type transactionCoordinatorClient struct {
 // where the TC located.
 const TransactionCoordinatorAssign = "persistent://pulsar/system/transaction_coordinator_assign"
 
+var ErrTransactionCoordinatorNotEnabled = newError(TransactionCoordinatorNotEnabled, "The broker doesn't enable "+
+	"the transaction coordinator, or the transaction coordinator has not initialized")
+
 // newTransactionCoordinatorClientImpl init a transactionImpl coordinator client and
 // acquire connections with all transactionImpl coordinators.
 func newTransactionCoordinatorClientImpl(client *client) *transactionCoordinatorClient {
@@ -60,6 +63,9 @@ func (tc *transactionCoordinatorClient) start() error {
 	tc.cons = make([]internal.Connection, r.Partitions)
 
 	//Get connections with all transaction_impl coordinators which is synchronized
+	if r.Partitions <= 0 {
+		return ErrTransactionCoordinatorNotEnabled
+	}
 	for i := 0; i < r.Partitions; i++ {
 		err := tc.grabConn(uint64(i))
 		if err != nil {

pulsar/transaction_disabled_test.go

@@ -0,0 +1,34 @@
+//go:build clustered
+
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package pulsar
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestTransactionDisabled(t *testing.T) {
+	_, err := NewClient(ClientOptions{
+		URL:               "pulsar://broker-1:6650",
+		EnableTransaction: true,
+	})
+	assert.NotNil(t, err)
+	assert.ErrorContains(t, err, "Transactions are not enabled")
+}

scripts/run-ci-clustered.sh

@@ -18,6 +18,6 @@
 
 set -e -x
 
-go test -race -coverprofile=/tmp/coverage -timeout=5m -tags clustered -v -run 'Test.*ClusteredTestSuite' -v ./pulsar
+go test -race -coverprofile=/tmp/coverage -timeout=5m -tags clustered -v -run 'Test.*ClusteredTestSuite|TestTransactionDisabled' -v ./pulsar
 go tool cover -html=/tmp/coverage -o coverage.html