2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2022 Nordix Foundation. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
20 package org.openecomp.sdc.be.components.kafka;
22 import com.google.common.annotations.VisibleForTesting;
23 import java.time.Duration;
24 import java.util.ArrayList;
25 import java.util.Collections;
26 import java.util.List;
27 import java.util.Properties;
28 import java.util.UUID;
29 import org.apache.kafka.clients.CommonClientConfigs;
30 import org.apache.kafka.clients.consumer.ConsumerConfig;
31 import org.apache.kafka.clients.consumer.ConsumerRecord;
32 import org.apache.kafka.clients.consumer.ConsumerRecords;
33 import org.apache.kafka.clients.consumer.KafkaConsumer;
34 import org.apache.kafka.common.KafkaException;
35 import org.apache.kafka.common.config.SaslConfigs;
36 import org.openecomp.sdc.be.config.DistributionEngineConfiguration;
37 import org.openecomp.sdc.common.log.wrappers.Logger;
40 * Utility class that provides a KafkaConsumer to communicate with a kafka cluster
42 public class SdcKafkaConsumer {
44 private static final Logger log = Logger.getLogger(SdcKafkaConsumer.class.getName());
45 private static final String DEFAULT_SASL_MECHANISM = "SCRAM-SHA-512";
47 private final DistributionEngineConfiguration deConfiguration;
48 private KafkaConsumer<String, String> kafkaConsumer;
51 * Constructor setting up the KafkaConsumer from a predefined set of configurations
53 public SdcKafkaConsumer(DistributionEngineConfiguration deConfiguration){
54 log.info("Create SdcKafkaConsumer via constructor");
55 Properties properties = new Properties();
56 this.deConfiguration = deConfiguration;
58 properties.put(ConsumerConfig.CLIENT_ID_CONFIG, deConfiguration.getDistributionStatusTopic().getConsumerId()+ "-consumer-" + UUID.randomUUID());
59 properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
60 properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
61 properties.put(ConsumerConfig.GROUP_ID_CONFIG, deConfiguration.getDistributionStatusTopic().getConsumerGroup());
62 properties.put(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG, deConfiguration.getKafkaBootStrapServers());
63 properties.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, "SASL_PLAINTEXT");
64 properties.put(ConsumerConfig.ALLOW_AUTO_CREATE_TOPICS_CONFIG, false);
65 properties.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "latest");
66 properties.put(SaslConfigs.SASL_MECHANISM, getKafkaSaslMechanism());
68 properties.put(SaslConfigs.SASL_JAAS_CONFIG, getKafkaSaslJaasConfig());
69 kafkaConsumer = new KafkaConsumer<>(properties);
74 * @param kafkaConsumer a kafkaConsumer to use within the class
75 * @param deConfiguration - Configuration to pass into the class
78 SdcKafkaConsumer(KafkaConsumer kafkaConsumer, DistributionEngineConfiguration deConfiguration){
79 this.deConfiguration = deConfiguration;
80 this.kafkaConsumer = kafkaConsumer;
85 * @return the Sasl Jass Config
87 private String getKafkaSaslJaasConfig() {
88 String saslJaasConfFromEnv = System.getenv("SASL_JAAS_CONFIG");
89 if(saslJaasConfFromEnv != null) {
90 return saslJaasConfFromEnv;
92 throw new KafkaException("sasl.jaas.config not set for Kafka Consumer");
96 private static String getKafkaSaslMechanism() throws KafkaException {
97 String saslMechanism = System.getenv("SASL_MECHANISM");
98 if(saslMechanism != null) {
101 return DEFAULT_SASL_MECHANISM;
107 * @param topic Topic in which to subscribe
109 public void subscribe(String topic) throws KafkaException {
110 if (!kafkaConsumer.subscription().contains(topic)) {
111 kafkaConsumer.subscribe(Collections.singleton(topic));
117 * @return The list of messages for a specified topic, returned from the poll
119 public List<String> poll(String topicName) throws KafkaException {
120 log.info("SdcKafkaConsumer - polling for messages from Topic: {}", topicName);
121 List<String> msgs = new ArrayList<>();
122 ConsumerRecords<String, String> consumerRecordsForSpecificTopic = kafkaConsumer.poll(Duration.ofSeconds(deConfiguration.getDistributionStatusTopic().getPollingIntervalSec()));
123 for(ConsumerRecord<String, String> rec : consumerRecordsForSpecificTopic){
124 msgs.add(rec.value());