[STRIMZI] Migrate client from cambria to kafka native

Add call to sdc to get kafka and topic details
Add kafka config to IConfiguration interface

Signed-off-by: efiacor <fiachra.corcoran@est.tech>
Change-Id: Ibec77d1ff1cd25ad4adce133ee81d66e54c7707f
Issue-ID: DMAAP-1745

1 files changed, 100 insertions, 0 deletions

diff --git a/sdc-distribution-client/src/main/java/org/onap/sdc/utils/kafka/SdcKafkaConsumer.java b/sdc-distribution-client/src/main/java/org/onap/sdc/utils/kafka/SdcKafkaConsumer.java
new file mode 100644
index 0000000..71f793d
--- /dev/null
+++ b/sdc-distribution-client/src/main/java/org/onap/sdc/utils/kafka/SdcKafkaConsumer.java
@@ -0,0 +1,100 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * sdc-distribution-client
+ * ================================================================================
+ * Copyright (C) 2022 Nordix Foundation. All rights reserved.
+ * ================================================================================
+ * 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 org.onap.sdc.utils.kafka;
+
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Properties;
+import java.util.UUID;
+import org.apache.kafka.clients.CommonClientConfigs;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.config.SaslConfigs;
+import org.apache.kafka.common.errors.InvalidGroupIdException;
+import org.onap.sdc.impl.Configuration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Utility class that provides a KafkaConsumer to communicate with a kafka cluster
+ */
+public class SdcKafkaConsumer {
+
+    private static final Logger log = LoggerFactory.getLogger(SdcKafkaConsumer.class);
+    final KafkaConsumer<String, String> consumer;
+    private final int pollTimeout;
+    private String topicName;
+
+    /**
+     *
+     * @param configuration The config provided to the client
+     */
+    public SdcKafkaConsumer(Configuration configuration) {
+        Properties props = new Properties();
+        props.put(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG, configuration.getMsgBusAddress());
+        props.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, configuration.getKafkaSecurityProtocolConfig());
+        props.put(SaslConfigs.SASL_MECHANISM, configuration.getKafkaSaslMechanism());
+        props.put(SaslConfigs.SASL_JAAS_CONFIG, configuration.getKafkaSaslJaasConfig());
+        props.put(ConsumerConfig.GROUP_ID_CONFIG, configuration.getConsumerGroup());
+        props.put(ConsumerConfig.CLIENT_ID_CONFIG, configuration.getConsumerID() + "-consumer-" + UUID.randomUUID());
+        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "latest");
+        props.put(ConsumerConfig.ALLOW_AUTO_CREATE_TOPICS_CONFIG, false);
+        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,  "org.apache.kafka.common.serialization.StringDeserializer");
+        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
+        consumer = new KafkaConsumer<>(props);
+        pollTimeout = configuration.getPollingTimeout();
+    }
+
+    /**
+     *
+     * @param topic The kafka topic to subscribe to
+     */
+    public void subscribe(String topic) {
+        try {
+            consumer.subscribe(Collections.singleton(topic));
+            this.topicName = topic;
+        }
+        catch (InvalidGroupIdException e) {
+            log.error("Invalid Group {}", e.getMessage());
+        }
+    }
+
+    /**
+     *
+     * @return The list of records returned from the poll
+     */
+    public List<String> poll() {
+        List<String> msgs = new ArrayList<>();
+        ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(pollTimeout));
+        for (ConsumerRecord<String, String> rec : records) {
+            msgs.add(rec.value());
+        }
+        return msgs;
+    }
+
+    public String getTopicName() {
+        return topicName;
+    }
+}
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