CloudEvents support for cps-core

- Moving cloud events dependencies to the cps-service module instead of
  cps-ncmp-service
- Testware has moved and new tests also introduced
- EventsPublisher also moved

Issue-ID: CPS-2040
Change-Id: Ibafb15e7e9efbdbe1e00e2b4f0da820bbcead004
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>

3 files changed, 342 insertions, 0 deletions

diff --git a/cps-service/pom.xml b/cps-service/pom.xml
index 9c2ee8691..e661f3421 100644
--- a/cps-service/pom.xml
+++ b/cps-service/pom.xml
@@ -128,6 +128,18 @@
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
     </dependency>
+    <dependency>
+      <groupId>io.cloudevents</groupId>
+      <artifactId>cloudevents-json-jackson</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>io.cloudevents</groupId>
+      <artifactId>cloudevents-kafka</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>io.cloudevents</groupId>
+      <artifactId>cloudevents-spring</artifactId>
+    </dependency>
     <!-- T E S T   D E P E N D E N C I E S -->
     <dependency>
       <groupId>org.springframework</groupId>
diff --git a/cps-service/src/main/java/org/onap/cps/events/EventsPublisher.java b/cps-service/src/main/java/org/onap/cps/events/EventsPublisher.java
new file mode 100644
index 000000000..8023fbfb2
--- /dev/null
+++ b/cps-service/src/main/java/org/onap/cps/events/EventsPublisher.java
@@ -0,0 +1,136 @@
+/*
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2022-2024 Nordix Foundation
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.events;
+
+import io.cloudevents.CloudEvent;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.common.header.Headers;
+import org.apache.kafka.common.header.internals.RecordHeaders;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.kafka.support.SendResult;
+import org.springframework.stereotype.Service;
+import org.springframework.util.SerializationUtils;
+
+/**
+ * EventsPublisher to publish events.
+ */
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class EventsPublisher<T> {
+
+    /**
+     * KafkaTemplate for legacy (non-cloud) events.
+     * Note: Cloud events should be used. This will be addressed as part of  https://jira.onap.org/browse/CPS-1717.
+     */
+    private final KafkaTemplate<String, T> legacyKafkaEventTemplate;
+
+    private final KafkaTemplate<String, CloudEvent> cloudEventKafkaTemplate;
+
+    /**
+     * Generic CloudEvent publisher.
+     *
+     * @param topicName valid topic name
+     * @param eventKey  message key
+     * @param event     message payload
+     */
+    public void publishCloudEvent(final String topicName, final String eventKey, final CloudEvent event) {
+        final CompletableFuture<SendResult<String, CloudEvent>> eventFuture =
+                cloudEventKafkaTemplate.send(topicName, eventKey, event);
+        eventFuture.whenComplete((result, e) -> {
+            if (e == null) {
+                log.debug("Successfully published event to topic : {} , Event : {}", result.getRecordMetadata().topic(),
+                        result.getProducerRecord().value());
+
+            } else {
+                log.error("Unable to publish event to topic : {} due to {}", topicName, e.getMessage());
+            }
+        });
+    }
+
+    /**
+     * Generic Event publisher.
+     * Note: Cloud events should be used. This will be addressed as part of  https://jira.onap.org/browse/CPS-1717.
+     *
+     * @param topicName valid topic name
+     * @param eventKey  message key
+     * @param event     message payload
+     */
+    public void publishEvent(final String topicName, final String eventKey, final T event) {
+        final CompletableFuture<SendResult<String, T>> eventFuture =
+                legacyKafkaEventTemplate.send(topicName, eventKey, event);
+        handleLegacyEventCallback(topicName, eventFuture);
+    }
+
+    /**
+     * Generic Event Publisher with headers.
+     *
+     * @param topicName    valid topic name
+     * @param eventKey     message key
+     * @param eventHeaders event headers
+     * @param event        message payload
+     */
+    public void publishEvent(final String topicName, final String eventKey, final Headers eventHeaders, final T event) {
+
+        final ProducerRecord<String, T> producerRecord =
+                new ProducerRecord<>(topicName, null, eventKey, event, eventHeaders);
+        final CompletableFuture<SendResult<String, T>> eventFuture = legacyKafkaEventTemplate.send(producerRecord);
+        handleLegacyEventCallback(topicName, eventFuture);
+    }
+
+    /**
+     * Generic Event Publisher with headers.
+     *
+     * @param topicName    valid topic name
+     * @param eventKey     message key
+     * @param eventHeaders map of event headers
+     * @param event        message payload
+     */
+    public void publishEvent(final String topicName, final String eventKey, final Map<String, Object> eventHeaders,
+            final T event) {
+
+        publishEvent(topicName, eventKey, convertToKafkaHeaders(eventHeaders), event);
+    }
+
+    private void handleLegacyEventCallback(final String topicName,
+            final CompletableFuture<SendResult<String, T>> eventFuture) {
+        eventFuture.whenComplete((result, e) -> {
+            if (e == null) {
+                log.debug("Successfully published event to topic : {} , Event : {}", result.getRecordMetadata().topic(),
+                        result.getProducerRecord().value());
+            } else {
+                log.error("Unable to publish event to topic : {} due to {}", topicName, e.getMessage());
+            }
+        });
+    }
+
+    private Headers convertToKafkaHeaders(final Map<String, Object> eventMessageHeaders) {
+        final Headers eventHeaders = new RecordHeaders();
+        eventMessageHeaders.forEach((key, value) -> eventHeaders.add(key, SerializationUtils.serialize(value)));
+        return eventHeaders;
+    }
+
+}
diff --git a/cps-service/src/test/groovy/org/onap/cps/events/EventsPublisherSpec.groovy b/cps-service/src/test/groovy/org/onap/cps/events/EventsPublisherSpec.groovy
new file mode 100644
index 000000000..fe67287de
--- /dev/null
+++ b/cps-service/src/test/groovy/org/onap/cps/events/EventsPublisherSpec.groovy
@@ -0,0 +1,194 @@
+/*
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2024 Nordix Foundation
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.events
+
+import ch.qos.logback.classic.Level
+import ch.qos.logback.classic.Logger
+import ch.qos.logback.classic.spi.ILoggingEvent
+import ch.qos.logback.core.read.ListAppender
+import io.cloudevents.CloudEvent
+import org.apache.kafka.clients.producer.ProducerRecord
+import org.apache.kafka.clients.producer.RecordMetadata
+import org.apache.kafka.common.TopicPartition
+import org.apache.kafka.common.header.Headers
+import org.apache.kafka.common.header.internals.RecordHeader
+import org.apache.kafka.common.header.internals.RecordHeaders
+import org.junit.jupiter.api.AfterEach
+import org.junit.jupiter.api.BeforeEach
+import org.slf4j.LoggerFactory
+import org.springframework.kafka.core.KafkaTemplate
+import org.springframework.kafka.support.SendResult
+import org.springframework.util.SerializationUtils
+import spock.lang.Specification
+
+import java.util.concurrent.CompletableFuture
+
+class EventsPublisherSpec extends Specification {
+
+    def legacyKafkaTemplateMock = Mock(KafkaTemplate)
+    def mockCloudEventKafkaTemplate = Mock(KafkaTemplate)
+    def logger = Spy(ListAppender<ILoggingEvent>)
+
+    void setup() {
+        def setupLogger = ((Logger) LoggerFactory.getLogger(EventsPublisher.class))
+        setupLogger.setLevel(Level.DEBUG)
+        setupLogger.addAppender(logger)
+        logger.start()
+    }
+
+    void cleanup() {
+        ((Logger) LoggerFactory.getLogger(EventsPublisher.class)).detachAndStopAllAppenders()
+    }
+
+    def objectUnderTest = new EventsPublisher(legacyKafkaTemplateMock, mockCloudEventKafkaTemplate)
+
+    def 'Publish Cloud Event'() {
+        given: 'a successfully published event'
+            def eventFuture = CompletableFuture.completedFuture(
+                new SendResult(
+                    new ProducerRecord('some-topic', 'some-value'),
+                    new RecordMetadata(new TopicPartition('some-topic', 0), 0, 0, 0, 0, 0)
+                )
+            )
+            def someCloudEvent = Mock(CloudEvent)
+            1 * mockCloudEventKafkaTemplate.send('some-topic', 'some-event-key', someCloudEvent) >> eventFuture
+        when: 'publishing the cloud event'
+            objectUnderTest.publishCloudEvent('some-topic', 'some-event-key', someCloudEvent)
+        then: 'the correct debug message is logged'
+            def lastLoggingEvent = logger.list[0]
+            assert lastLoggingEvent.level == Level.DEBUG
+            assert lastLoggingEvent.formattedMessage.contains('Successfully published event')
+    }
+
+    def 'Publish Cloud Event with Exception'() {
+        given: 'a failed event'
+            def eventFutureWithFailure = new CompletableFuture<SendResult<String, String>>()
+            eventFutureWithFailure.completeExceptionally(new RuntimeException('some exception'))
+            def someCloudEvent = Mock(CloudEvent)
+            1 * mockCloudEventKafkaTemplate.send('some-topic', 'some-event-key', someCloudEvent) >> eventFutureWithFailure
+        when: 'publishing the cloud event'
+            objectUnderTest.publishCloudEvent('some-topic', 'some-event-key', someCloudEvent)
+        then: 'the correct error message is logged'
+            def lastLoggingEvent = logger.list[0]
+            assert lastLoggingEvent.level == Level.ERROR
+            assert lastLoggingEvent.formattedMessage.contains('Unable to publish event')
+    }
+
+    def 'Publish Legacy Event'() {
+        given: 'a successfully published event'
+            def eventFuture = CompletableFuture.completedFuture(
+                new SendResult(
+                    new ProducerRecord('some-topic', 'some-value'),
+                    new RecordMetadata(new TopicPartition('some-topic', 0), 0, 0, 0, 0, 0)
+                )
+            )
+            def someEvent = Mock(Object)
+            1 * legacyKafkaTemplateMock.send('some-topic', 'some-event-key', someEvent) >> eventFuture
+        when: 'publishing the cloud event'
+            objectUnderTest.publishEvent('some-topic', 'some-event-key', someEvent)
+        then: 'the correct debug message is logged'
+            def lastLoggingEvent = logger.list[0]
+            assert lastLoggingEvent.level == Level.DEBUG
+            assert lastLoggingEvent.formattedMessage.contains('Successfully published event')
+    }
+
+    def 'Publish Legacy Event with Headers as Map'() {
+        given: 'a successfully published event'
+            def sampleEventHeaders = ['k1': SerializationUtils.serialize('v1')]
+            def eventFuture = CompletableFuture.completedFuture(
+                new SendResult(
+                    new ProducerRecord('some-topic', 'some-value'),
+                    new RecordMetadata(new TopicPartition('some-topic', 0), 0, 0, 0, 0, 0)
+                )
+            )
+            def someEvent = Mock(Object.class)
+        when: 'publishing the legacy event'
+            objectUnderTest.publishEvent('some-topic', 'some-event-key', sampleEventHeaders, someEvent)
+        then: 'event is published'
+            1 * legacyKafkaTemplateMock.send(_) >> eventFuture
+        and: 'the correct debug message is logged'
+            def lastLoggingEvent = logger.list[0]
+            assert lastLoggingEvent.level == Level.DEBUG
+            assert lastLoggingEvent.formattedMessage.contains('Successfully published event')
+    }
+
+    def 'Publish Legacy Event with Record Headers'() {
+        given: 'a successfully published event'
+            def sampleEventHeaders = new RecordHeaders([new RecordHeader('k1', SerializationUtils.serialize('v1'))])
+            def sampleProducerRecord = new ProducerRecord('some-topic', null, 'some-key', 'some-value', sampleEventHeaders)
+            def eventFuture = CompletableFuture.completedFuture(
+                new SendResult(
+                    sampleProducerRecord,
+                    new RecordMetadata(new TopicPartition('some-topic', 0), 0, 0, 0, 0, 0)
+                )
+            )
+            def someEvent = Mock(Object.class)
+        when: 'publishing the legacy event'
+            objectUnderTest.publishEvent('some-topic', 'some-event-key', sampleEventHeaders, someEvent)
+        then: 'event is published'
+            1 * legacyKafkaTemplateMock.send(_) >> eventFuture
+        and: 'the correct debug message is logged'
+            def lastLoggingEvent = logger.list[0]
+            assert lastLoggingEvent.level == Level.DEBUG
+            assert lastLoggingEvent.formattedMessage.contains('Successfully published event')
+    }
+
+    def 'Handle Legacy Event Callback'() {
+        given: 'an event is successfully published'
+            def eventFuture = CompletableFuture.completedFuture(
+                new SendResult(
+                    new ProducerRecord('some-topic', 'some-value'),
+                    new RecordMetadata(new TopicPartition('some-topic', 0), 0, 0, 0, 0, 0)
+                )
+            )
+        when: 'handling legacy event callback'
+            objectUnderTest.handleLegacyEventCallback('some-topic', eventFuture)
+        then: 'the correct debug message is logged'
+            def lastLoggingEvent = logger.list[0]
+            assert lastLoggingEvent.level == Level.DEBUG
+            assert lastLoggingEvent.formattedMessage.contains('Successfully published event')
+    }
+
+    def 'Handle Legacy Event Callback with Exception'() {
+        given: 'a failure to publish an event'
+            def eventFutureWithFailure = new CompletableFuture<SendResult<String, String>>()
+            eventFutureWithFailure.completeExceptionally(new RuntimeException('some exception'))
+        when: 'handling legacy event callback'
+            objectUnderTest.handleLegacyEventCallback('some-topic', eventFutureWithFailure)
+        then: 'the correct error message is logged'
+            def lastLoggingEvent = logger.list[0]
+            assert lastLoggingEvent.level == Level.ERROR
+            assert lastLoggingEvent.formattedMessage.contains('Unable to publish event')
+    }
+
+    def 'Convert to kafka headers'() {
+        given: 'Few key value pairs'
+            def someKeyValue = ['key1': 'value1', 'key2': 'value2']
+        when: 'we convert to headers'
+            def headers = objectUnderTest.convertToKafkaHeaders(someKeyValue)
+        then: 'it is correctly converted'
+            assert headers instanceof Headers
+        and: 'also has correct values'
+            assert headers[0].key() == 'key1'
+            assert headers[1].key() == 'key2'
+    }
+
+}
\ No newline at end of file