Implement Kafka stream definition parsers

Change-Id: I43215c1c2494b6036deb004891fb76bfd2b74474
Issue-ID: DCAEGEN2-1341
Signed-off-by: Piotr Jaszczyk <piotr.jaszczyk@nokia.com>

7 files changed, 208 insertions, 0 deletions

diff --git a/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/impl/streams/gson/KafkaSinkParserTest.java b/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/impl/streams/gson/KafkaSinkParserTest.java
new file mode 100644
index 00000000..b5481203
--- /dev/null
+++ b/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/impl/streams/gson/KafkaSinkParserTest.java
@@ -0,0 +1,115 @@
+/*
+ * ============LICENSE_START====================================
+ * DCAEGEN2-SERVICES-SDK
+ * =========================================================
+ * Copyright (C) 2019 Nokia. 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.dcaegen2.services.sdk.rest.services.cbs.client.impl.streams.gson;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.in;
+import static org.junit.jupiter.api.Assertions.*;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import io.vavr.Function1;
+import io.vavr.control.Either;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import org.junit.jupiter.api.Test;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.exceptions.StreamParserError;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParser;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParsers;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.streams.dmaap.KafkaSink;
+
+/**
+ * @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
+ * @since March 2019
+ */
+class KafkaSinkParserTest {
+
+    private final StreamFromGsonParser<KafkaSink> cut = StreamFromGsonParsers.kafkaSinkParser();
+
+    @Test
+    void precondition_assureInstanceOf() {
+        assertThat(cut).isInstanceOf(KafkaSinkParser.class);
+    }
+
+    @Test
+    void shouldParseMinimalKafkaSinkDefinition() throws IOException {
+        // given
+        JsonObject input = GsonUtils.readObjectFromResource("/streams/kafka_sink_minimal.json");
+
+        // when
+        final KafkaSink result = cut.unsafeParse(input);
+
+        // then
+        assertThat(result.aafCredentials()).isNull();
+        assertThat(result.bootstrapServers()).isEqualTo("dmaap-mr-kafka-0:6060,dmaap-mr-kafka-1:6060");
+        assertThat(result.topicName()).isEqualTo("HVVES_PERF3GPP");
+        assertThat(result.clientId()).isNull();
+        assertThat(result.clientRole()).isNull();
+    }
+
+    @Test
+    void shouldParseBasicKafkaSinkDefinition() throws IOException {
+        // given
+        JsonObject input = GsonUtils.readObjectFromResource("/streams/kafka_sink.json");
+
+        // when
+        final KafkaSink result = cut.unsafeParse(input);
+
+        // then
+        assertThat(result.aafCredentials()).isNull();
+        assertThat(result.bootstrapServers()).isEqualTo("dmaap-mr-kafka-0:6060,dmaap-mr-kafka-1:6060");
+        assertThat(result.topicName()).isEqualTo("HVVES_PERF3GPP");
+        assertThat(result.clientId()).isEqualTo("1500462518108");
+        assertThat(result.clientRole()).isEqualTo("com.dcae.member");
+    }
+
+    @Test
+    void shouldReturnErrorWhenStructureIsWrong() throws IOException {
+        // given
+        JsonObject input = GsonUtils.readObjectFromResource("/streams/kafka_sink_missing_child.json");
+
+        // when
+        final Either<StreamParserError, KafkaSink> result = cut.parse(input);
+
+        // then
+        assertThat(result.isRight()).describedAs("should not be right").isFalse();
+        result.peekLeft(error -> {
+            assertThat(error.message()).contains("kafka_info");
+        });
+    }
+
+    @Test
+    void shouldReturnErrorWhenTypeIsWrong() throws IOException {
+        // given
+        JsonObject input = GsonUtils.readObjectFromResource("/streams/kafka_sink_invalid_type.json");
+
+        // when
+        final Either<StreamParserError, KafkaSink> result = cut.parse(input);
+
+        // then
+        assertThat(result.isRight()).describedAs("should not be right").isFalse();
+        result.peekLeft(error -> {
+            assertThat(error.message()).containsIgnoringCase("invalid stream type");
+            assertThat(error.message()).containsIgnoringCase("kafka");
+            assertThat(error.message()).containsIgnoringCase("message_router");
+        });
+    }
+}
\ No newline at end of file
diff --git a/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/impl/streams/gson/KafkaSourceParserTest.java b/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/impl/streams/gson/KafkaSourceParserTest.java
new file mode 100644
index 00000000..87131285
--- /dev/null
+++ b/rest-services/cbs-client/src/test/java/org/onap/dcaegen2/services/sdk/rest/services/cbs/client/impl/streams/gson/KafkaSourceParserTest.java
@@ -0,0 +1,60 @@
+/*
+ * ============LICENSE_START====================================
+ * DCAEGEN2-SERVICES-SDK
+ * =========================================================
+ * Copyright (C) 2019 Nokia. 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.dcaegen2.services.sdk.rest.services.cbs.client.impl.streams.gson;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.google.gson.JsonObject;
+import java.io.IOException;
+import org.junit.jupiter.api.Test;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParser;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParsers;
+import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.streams.dmaap.KafkaSource;
+
+/**
+ * @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
+ * @since March 2019
+ */
+class KafkaSourceParserTest {
+
+    private final StreamFromGsonParser<KafkaSource> cut = StreamFromGsonParsers.kafkaSourceParser();
+
+    @Test
+    void precondition_assureInstanceOf() {
+        assertThat(cut).isInstanceOf(KafkaSourceParser.class);
+    }
+
+    @Test
+    void shouldParseMinimalKafkaSourceDefinition() throws IOException {
+        // given
+        JsonObject input = GsonUtils.readObjectFromResource("/streams/kafka_source_minimal.json");
+
+        // when
+        final KafkaSource result = cut.unsafeParse(input);
+
+        // then
+        assertThat(result.aafCredentials()).isNull();
+        assertThat(result.bootstrapServers()).isEqualTo("dmaap-mr-kafka-0:6060,dmaap-mr-kafka-1:6060");
+        assertThat(result.topicName()).isEqualTo("HVVES_PERF3GPP");
+        assertThat(result.clientId()).isNull();
+        assertThat(result.clientRole()).isNull();
+    }
+}
\ No newline at end of file
diff --git a/rest-services/cbs-client/src/test/resources/streams/kafka_sink.json b/rest-services/cbs-client/src/test/resources/streams/kafka_sink.json
new file mode 100644
index 00000000..b60388d5
--- /dev/null
+++ b/rest-services/cbs-client/src/test/resources/streams/kafka_sink.json
@@ -0,0 +1,9 @@
+{
+    "type": "kafka",
+    "kafka_info": {
+        "client_role": "com.dcae.member",
+        "client_id": "1500462518108",
+        "bootstrap_servers": "dmaap-mr-kafka-0:6060,dmaap-mr-kafka-1:6060",
+        "topic_name": "HVVES_PERF3GPP"
+    }
+}
diff --git a/rest-services/cbs-client/src/test/resources/streams/kafka_sink_invalid_type.json b/rest-services/cbs-client/src/test/resources/streams/kafka_sink_invalid_type.json
new file mode 100644
index 00000000..0ee88adb
--- /dev/null
+++ b/rest-services/cbs-client/src/test/resources/streams/kafka_sink_invalid_type.json
@@ -0,0 +1,7 @@
+{
+    "type": "message_router",
+    "kafka_info": {
+        "bootstrap_servers": "dmaap-mr-kafka-0:6060,dmaap-mr-kafka-1:6060",
+        "topic_name": "HVVES_PERF3GPP"
+    }
+}
diff --git a/rest-services/cbs-client/src/test/resources/streams/kafka_sink_minimal.json b/rest-services/cbs-client/src/test/resources/streams/kafka_sink_minimal.json
new file mode 100644
index 00000000..da8dd4fe
--- /dev/null
+++ b/rest-services/cbs-client/src/test/resources/streams/kafka_sink_minimal.json
@@ -0,0 +1,7 @@
+{
+    "type": "kafka",
+    "kafka_info": {
+        "bootstrap_servers": "dmaap-mr-kafka-0:6060,dmaap-mr-kafka-1:6060",
+        "topic_name": "HVVES_PERF3GPP"
+    }
+}
diff --git a/rest-services/cbs-client/src/test/resources/streams/kafka_sink_missing_child.json b/rest-services/cbs-client/src/test/resources/streams/kafka_sink_missing_child.json
new file mode 100644
index 00000000..d2591b3a
--- /dev/null
+++ b/rest-services/cbs-client/src/test/resources/streams/kafka_sink_missing_child.json
@@ -0,0 +1,3 @@
+{
+    "type": "kafka"
+}
diff --git a/rest-services/cbs-client/src/test/resources/streams/kafka_source_minimal.json b/rest-services/cbs-client/src/test/resources/streams/kafka_source_minimal.json
new file mode 100644
index 00000000..da8dd4fe
--- /dev/null
+++ b/rest-services/cbs-client/src/test/resources/streams/kafka_source_minimal.json
@@ -0,0 +1,7 @@
+{
+    "type": "kafka",
+    "kafka_info": {
+        "bootstrap_servers": "dmaap-mr-kafka-0:6060,dmaap-mr-kafka-1:6060",
+        "topic_name": "HVVES_PERF3GPP"
+    }
+}