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/*
* ============LICENSE_START====================================
* DCAEGEN2-SERVICES-SDK
* =========================================================
* Copyright (C) 2019-2021 Nokia. All rights reserved.
* Copyright (C) 2023 Deutsche Telekom AG. 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.dmaap.client.impl;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import io.netty.handler.timeout.ReadTimeoutException;
import io.vavr.collection.HashMap;
import io.vavr.collection.List;
import io.vavr.collection.Map;
import io.vavr.control.Option;
import org.apache.kafka.clients.CommonClientConfigs;
import org.apache.kafka.clients.consumer.Consumer;
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.security.auth.SecurityProtocol;
import org.apache.kafka.common.security.scram.internals.ScramMechanism;
import org.jetbrains.annotations.NotNull;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpMethod;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpRequest;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpResponse;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.ImmutableHttpRequest;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RxHttpClient;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.exceptions.RetryableException;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.api.MessageRouterSubscriber;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.error.ClientErrorReason;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.error.ClientErrorReasonPresenter;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.error.ClientErrorReasons;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterPublishResponse;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterSubscribeResponse;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeRequest;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeResponse;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.config.DmaapTimeoutConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.net.ConnectException;
import java.nio.charset.StandardCharsets;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Properties;
import static org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl.Commons.extractFailReason;
import static org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl.Commons.getTopicFromTopicUrl;
import static org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl.Commons.checkIfTopicIsPresentInKafka;
import static org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl.Commons.setKafkaPropertiesFromSystemEnv;
/**
* @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
* @since March 2019
*/
public class MessageRouterSubscriberImpl implements MessageRouterSubscriber {
private final RxHttpClient httpClient;
private final Gson gson;
private final ClientErrorReasonPresenter clientErrorReasonPresenter;
private static final Logger LOGGER = LoggerFactory.getLogger(MessageRouterSubscriberImpl.class);
private static Properties props;
private static final String kafkaBootstrapServers = "BOOTSTRAP_SERVERS";
private static Consumer<String, String> consumer;
public MessageRouterSubscriberImpl(RxHttpClient httpClient, Gson gson,
ClientErrorReasonPresenter clientErrorReasonPresenter) throws Exception {
this.httpClient = httpClient;
this.gson = gson;
this.clientErrorReasonPresenter = clientErrorReasonPresenter;
setProperties();
}
/**
* New constructor that does not take DMaaP parameters as arguments.
*
* @throws Exception
*/
public MessageRouterSubscriberImpl() throws Exception {
this.httpClient = null;
this.gson = null;
this.clientErrorReasonPresenter = null;
setProperties();
}
@Override
public Mono<MessageRouterSubscribeResponse> get(MessageRouterSubscribeRequest request) {
LOGGER.info("Requesting new items from DMaaP MR: {}", request);
String topic = getTopicFromTopicUrl(request.sourceDefinition().topicUrl());
String fakeGroupName = request.consumerGroup();
props.put("client.id", request.consumerId());
props.put("group.id", fakeGroupName);
try{
if (consumer == null) {
if(!checkIfTopicIsPresentInKafka(topic,getAdminProps())) {
LOGGER.error("No such topic exists, TOPIC_NAME : {}", topic);
return Mono.just(ImmutableMessageRouterSubscribeResponse.builder()
.failReason("404 Topic Not Found")
.build());
}
consumer = getKafkaConsumer(props);
consumer.subscribe(Arrays.asList(topic));
}
ArrayList<String> msgs = new ArrayList<>();
ConsumerRecords<String, String> records = null;
synchronized (consumer) {
records = consumer.poll(Duration.ofMillis(500));
}
for (ConsumerRecord<String, String> rec : records) {
msgs.add(rec.value());
}
List<JsonElement> list = List.ofAll(msgs).map(r -> JsonParser.parseString(r));
return Mono.just(ImmutableMessageRouterSubscribeResponse.builder()
.items(list)
.build());
} catch(Exception e) {
LOGGER.error("Error while consuming the messages : {}",e.getMessage());
return Mono.just(ImmutableMessageRouterSubscribeResponse.builder()
.failReason(e.getMessage())
.build());
}
}
@Override
public void setConsumer(Consumer<String, String> consumer) {
MessageRouterSubscriberImpl.consumer = consumer;
}
public static KafkaConsumer<String, String> getKafkaConsumer(Properties props){
return new KafkaConsumer<>(props);
}
@Override
public void close(){
if(consumer != null) {
LOGGER.info("Closing the Kafka Consumer");
consumer.close();
consumer = null;
}
Commons.closeKafkaAdminClient();
}
void setProperties() throws Exception {
props = setKafkaPropertiesFromSystemEnv(System.getenv());
if(System.getenv(kafkaBootstrapServers) == null) {
LOGGER.error("Environment Variable "+ kafkaBootstrapServers+" is missing");
throw new Exception("Environment Variable "+ kafkaBootstrapServers+" is missing");
}else {
props.put("bootstrap.servers", System.getenv(kafkaBootstrapServers));
}
props.put(ConsumerConfig.ALLOW_AUTO_CREATE_TOPICS_CONFIG,false);
if(System.getenv("JAAS_CONFIG") == null) {
LOGGER.info("Not using any authentication for kafka interaction");
}else {
LOGGER.info("Using {} authentication provided for kafka interaction",ScramMechanism.SCRAM_SHA_512.mechanismName());
props.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG,SecurityProtocol.SASL_PLAINTEXT.name);
props.put(SaslConfigs.SASL_MECHANISM, ScramMechanism.SCRAM_SHA_512.mechanismName());
props.put(SaslConfigs.SASL_JAAS_CONFIG, System.getenv("JAAS_CONFIG"));
}
}
// @Override
// public Mono<MessageRouterSubscribeResponse> get(MessageRouterSubscribeRequest request) {
// LOGGER.debug("Requesting new items from DMaaP MR: {}", request);
// return httpClient.call(buildGetHttpRequest(request))
// .map(this::buildGetResponse)
// .doOnError(ReadTimeoutException.class,
// e -> LOGGER.error("Timeout exception occurred when subscribe items from DMaaP MR", e))
// .onErrorResume(ReadTimeoutException.class, e -> buildErrorResponse(ClientErrorReasons.TIMEOUT))
// .doOnError(ConnectException.class, e -> LOGGER.error("DMaaP MR is unavailable, {}", e.getMessage()))
// .onErrorResume(ConnectException.class, e -> buildErrorResponse(ClientErrorReasons.SERVICE_UNAVAILABLE))
// .onErrorResume(RetryableException.class, e -> Mono.just(buildGetResponse(e.getResponse())));
// }
public static Properties getAdminProps() {
Properties adminProps = new Properties();
adminProps.put("bootstrap.servers", System.getenv(kafkaBootstrapServers));
if(System.getenv("JAAS_CONFIG") != null) {
adminProps.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG,SecurityProtocol.SASL_PLAINTEXT.name);
adminProps.put(SaslConfigs.SASL_MECHANISM, ScramMechanism.SCRAM_SHA_512.mechanismName());
adminProps.put(SaslConfigs.SASL_JAAS_CONFIG, System.getenv("JAAS_CONFIG"));
}
return adminProps;
}
private @NotNull HttpRequest buildGetHttpRequest(MessageRouterSubscribeRequest request) {
return ImmutableHttpRequest.builder()
.method(HttpMethod.GET)
.url(buildSubscribeUrl(request))
.diagnosticContext(request.diagnosticContext().withNewInvocationId())
.customHeaders(headers(request))
.timeout(timeout(request).getOrNull())
.build();
}
private @NotNull MessageRouterSubscribeResponse buildGetResponse(HttpResponse httpResponse) {
final ImmutableMessageRouterSubscribeResponse.Builder builder =
ImmutableMessageRouterSubscribeResponse.builder();
return httpResponse.successful()
? builder.items(getAsJsonElements(httpResponse)).build()
: builder.failReason(extractFailReason(httpResponse)).build();
}
private List<JsonElement> getAsJsonElements(HttpResponse httpResponse) {
JsonArray bodyAsJsonArray = httpResponse
.bodyAsJson(StandardCharsets.UTF_8, gson, JsonArray.class);
return List.ofAll(bodyAsJsonArray).map(arrayElement -> JsonParser.parseString(arrayElement.getAsString()));
}
private String buildSubscribeUrl(MessageRouterSubscribeRequest request) {
return String.format("%s/%s/%s", request.sourceDefinition().topicUrl(), request.consumerGroup(),
request.consumerId());
}
private Mono<MessageRouterSubscribeResponse> buildErrorResponse(ClientErrorReason clientErrorReason) {
String failReason = clientErrorReasonPresenter.present(clientErrorReason);
return Mono.just(ImmutableMessageRouterSubscribeResponse.builder()
.failReason(failReason)
.build());
}
private Option<Duration> timeout(MessageRouterSubscribeRequest request) {
return Option.of(request.timeoutConfig())
.map(DmaapTimeoutConfig::getTimeout);
}
private Map<String, String> headers(MessageRouterSubscribeRequest request) {
return Option.of(request.sourceDefinition().aafCredentials())
.map(Commons::basicAuthHeader)
.map(HashMap::of)
.getOrElse(HashMap.empty());
}
}
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