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// -
// ========================LICENSE_START=================================
// Copyright (C) 2024: Deutsche Telecom
//
// Licensed 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.
// ========================LICENSE_END===================================
// Package kafkacomm provides utilities for producing messages to a Kafka topic
// using a configurable Kafka producer. It supports SASL authentication and
// dynamic topic configuration.
package kafkacomm
import (
"github.com/confluentinc/confluent-kafka-go/kafka"
"policy-opa-pdp/cfg"
"sync"
"log"
)
type KafkaProducerInterface interface {
Produce(*kafka.Message, chan kafka.Event) error
Close()
}
// KafkaProducer wraps a Kafka producer instance and a topic to provide
// a simple interface for producing messages.
type KafkaProducer struct {
producer KafkaProducerInterface
topic string
}
var (
instance *KafkaProducer
once sync.Once
)
// GetKafkaProducer initializes and returns a KafkaProducer instance which is a singleton.
// It configures the Kafka producer with the given bootstrap servers and topic.
// If SASL authentication is enabled via the configuration, the necessary credentials
// are set in the producer configuration.
func GetKafkaProducer(bootstrapServers, topic string) (*KafkaProducer, error) {
var err error
once.Do(func() {
brokers := cfg.BootstrapServer
useSASL := cfg.UseSASLForKAFKA
username := cfg.KAFKA_USERNAME
password := cfg.KAFKA_PASSWORD
// Add Kafka Connection Properties ....
configMap := &kafka.ConfigMap{
"bootstrap.servers": brokers,
}
if useSASL == "true" {
configMap.SetKey("sasl.mechanism", "SCRAM-SHA-512")
configMap.SetKey("sasl.username", username)
configMap.SetKey("sasl.password", password)
configMap.SetKey("security.protocol", "SASL_PLAINTEXT")
}
p, err := kafka.NewProducer(configMap)
if err != nil {
return
}
instance = &KafkaProducer{
producer: p,
topic: topic,
}
})
return instance, err
}
// Produce sends a message to the configured Kafka topic.
// It takes the message payload as a byte slice and returns any errors
func (kp *KafkaProducer) Produce(message []byte) error {
kafkaMessage := &kafka.Message{
TopicPartition: kafka.TopicPartition{Topic: &kp.topic, Partition: kafka.PartitionAny},
Value: []byte(message),
}
err := kp.producer.Produce(kafkaMessage, nil)
if err != nil {
return err
}
return nil
}
// Close shuts down the Kafka producer, releasing all resources.
func (kp *KafkaProducer) Close() {
if kp == nil || kp.producer == nil {
log.Println("KafkaProducer or producer is nil, skipping Close.")
return
}
kp.producer.Close()
log.Println("KafkaProducer closed successfully.")
}
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