Implement message counting in consumer

Issue-ID: DCAEGEN2-1635
Change-Id: I2666de7bad27052d9cefa0f687ad0772d4c9a95d
Signed-off-by: kjaniak <kornel.janiak@nokia.com>

3 files changed, 148 insertions, 0 deletions

diff --git a/sources/hv-collector-kafka/src/main/kotlin/org/onap/dcae/collectors/veshv/kafka/api/ConsumerFactory.kt b/sources/hv-collector-kafka/src/main/kotlin/org/onap/dcae/collectors/veshv/kafka/api/ConsumerFactory.kt
new file mode 100644
index 00000000..88eb8cec
--- /dev/null
+++ b/sources/hv-collector-kafka/src/main/kotlin/org/onap/dcae/collectors/veshv/kafka/api/ConsumerFactory.kt
@@ -0,0 +1,43 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2018-2019 NOKIA
+ * ================================================================================
+ * 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.dcae.collectors.veshv.kafka.api
+
+import org.onap.dcae.collectors.veshv.kafka.impl.KafkaSource
+import org.onap.dcae.collectors.veshv.utils.logging.Logger
+
+typealias ConsumerProvider = () -> KafkaConsumer
+
+object ConsumerFactory {
+    private val logger = Logger(ConsumerFactory::class)
+
+    fun createConsumersForTopics(kafkaBootstrapServers: String,
+                                 kafkaTopics: Set<String>,
+                                 consumerProvider: ConsumerProvider): Map<String, KafkaConsumer> =
+            KafkaSource.create(kafkaBootstrapServers, kafkaTopics).let { kafkaSource ->
+                val topicToConsumer = kafkaTopics.associate { it to consumerProvider() }
+                kafkaSource.start()
+                        .map {
+                            val topic = it.topic()
+                            topicToConsumer.get(topic)?.update(it)
+                                    ?: logger.warn { "No consumer configured for topic $topic" }
+                        }.subscribe()
+                topicToConsumer
+            }
+}
diff --git a/sources/hv-collector-kafka/src/main/kotlin/org/onap/dcae/collectors/veshv/kafka/api/KafkaConsumer.kt b/sources/hv-collector-kafka/src/main/kotlin/org/onap/dcae/collectors/veshv/kafka/api/KafkaConsumer.kt
new file mode 100644
index 00000000..ae797b6e
--- /dev/null
+++ b/sources/hv-collector-kafka/src/main/kotlin/org/onap/dcae/collectors/veshv/kafka/api/KafkaConsumer.kt
@@ -0,0 +1,27 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2018-2019 NOKIA
+ * ================================================================================
+ * 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.dcae.collectors.veshv.kafka.api
+
+import org.apache.kafka.clients.consumer.ConsumerRecord
+
+interface KafkaConsumer {
+    fun reset()
+    fun update(record: ConsumerRecord<ByteArray, ByteArray>)
+}
diff --git a/sources/hv-collector-kafka/src/main/kotlin/org/onap/dcae/collectors/veshv/kafka/impl/KafkaSource.kt b/sources/hv-collector-kafka/src/main/kotlin/org/onap/dcae/collectors/veshv/kafka/impl/KafkaSource.kt
new file mode 100644
index 00000000..98934b0d
--- /dev/null
+++ b/sources/hv-collector-kafka/src/main/kotlin/org/onap/dcae/collectors/veshv/kafka/impl/KafkaSource.kt
@@ -0,0 +1,78 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2018,2019 NOKIA
+ * ================================================================================
+ * 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.dcae.collectors.veshv.kafka.impl
+
+import org.apache.kafka.clients.CommonClientConfigs
+import org.apache.kafka.clients.consumer.ConsumerConfig
+import org.apache.kafka.common.config.SaslConfigs
+import org.apache.kafka.common.security.auth.SecurityProtocol
+import org.apache.kafka.common.security.plain.internals.PlainSaslServer.PLAIN_MECHANISM
+import org.apache.kafka.common.serialization.ByteArrayDeserializer
+import org.onap.dcae.collectors.veshv.utils.logging.Logger
+import reactor.core.publisher.Flux
+import reactor.kafka.receiver.KafkaReceiver
+import reactor.kafka.receiver.ReceiverOptions
+import reactor.kafka.receiver.ReceiverRecord
+
+/**
+ * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
+ * @since May 2018
+ */
+internal class KafkaSource(private val receiver: KafkaReceiver<ByteArray, ByteArray>) {
+    fun start(): Flux<ReceiverRecord<ByteArray, ByteArray>> =
+            receiver.receive()
+                    .doOnNext { it.receiverOffset().acknowledge() }
+                    .also { logger.info { "Started Kafka source" } }
+
+    companion object {
+        private val logger = Logger(KafkaSource::class)
+
+        private const val LOGIN_MODULE_CLASS = "org.apache.kafka.common.security.plain.PlainLoginModule"
+        private const val USERNAME = "admin"
+        private const val PASSWORD = "admin_secret"
+        private const val JAAS_CONFIG = "$LOGIN_MODULE_CLASS required username=$USERNAME password=$PASSWORD;"
+        private val SASL_PLAINTEXT = (SecurityProtocol.SASL_PLAINTEXT as Enum<SecurityProtocol>).name
+
+        fun create(bootstrapServers: String, topics: Set<String>) =
+                KafkaSource(KafkaReceiver.create(createReceiverOptions(bootstrapServers, topics)))
+
+        fun createReceiverOptions(bootstrapServers: String,
+                                  topics: Set<String>): ReceiverOptions<ByteArray, ByteArray>? {
+            val props = mapOf<String, Any>(
+                    ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG to bootstrapServers,
+                    ConsumerConfig.CLIENT_ID_CONFIG to "hv-collector-consumer",
+                    ConsumerConfig.GROUP_ID_CONFIG to "hv-collector-consumers",
+                    ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG to ByteArrayDeserializer::class.java,
+                    ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG to ByteArrayDeserializer::class.java,
+                    ConsumerConfig.AUTO_OFFSET_RESET_CONFIG to "earliest",
+                    ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG to "3000",
+
+
+                    CommonClientConfigs.SECURITY_PROTOCOL_CONFIG to SASL_PLAINTEXT,
+                    SaslConfigs.SASL_MECHANISM to PLAIN_MECHANISM,
+                    SaslConfigs.SASL_JAAS_CONFIG to JAAS_CONFIG
+            )
+            return ReceiverOptions.create<ByteArray, ByteArray>(props)
+                    .addAssignListener { partitions -> logger.debug { "Partitions assigned $partitions" } }
+                    .addRevokeListener { partitions -> logger.debug { "Partitions revoked $partitions" } }
+                    .subscription(topics)
+        }
+    }
+}