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pulsar.go
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pulsar.go
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//
// Copyright (c) 2020-2021 Datastax, Inc.
//
// 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 util
import (
"context"
"fmt"
"strings"
"time"
"github.com/apache/pulsar-client-go/pulsar"
"github.com/apex/log"
)
// ConsumerResult is Pulsar Consumer result for channel communication
type ConsumerResult struct {
Err error
InOrderDelivery bool
Latency time.Duration
Timestamp time.Time
}
// VerifyMessageByPulsarConsumer instantiates a Pulsar consumer and verifies an expected message
func VerifyMessageByPulsarConsumer(client pulsar.Client, topicName, expectedMessage string, completeChan chan *ConsumerResult) error {
topicParts := strings.Split(topicName, "/")
subscriptionName := "partition-sub" + topicParts[len(topicParts)-1]
consumer, err := client.Subscribe(pulsar.ConsumerOptions{
Topic: topicName,
SubscriptionName: subscriptionName,
Type: pulsar.Exclusive,
ReceiverQueueSize: 1,
SubscriptionInitialPosition: pulsar.SubscriptionPositionEarliest,
})
if err != nil {
log.Errorf("failed to created partition topic consumer, error: %v", err)
return err
}
defer consumer.Close()
receivedCount := 0
receiveTimeout := 60 * time.Second
start := time.Now()
for time.Since(start) < 90*time.Second { // TODO: this should be passed in as timeout parameter
cCtx, cancel := context.WithTimeout(context.Background(), receiveTimeout)
defer cancel()
log.Infof("%s wait to receive on message count %d", topicName, receivedCount)
receivedCount++
msg, err := consumer.Receive(cCtx)
if err != nil {
completeChan <- &ConsumerResult{
Err: fmt.Errorf("consumer Receive() error: %v", err),
}
break
}
consumer.Ack(msg)
if expectedMessage == string(msg.Payload()) {
log.Infof("expected message received by %s", topicName)
completeChan <- &ConsumerResult{
InOrderDelivery: true,
Timestamp: time.Now(),
}
return nil
}
}
return nil
}