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/*-
* ========================LICENSE_START=================================
* ONAP : ccsdk oran
* ======================================================================
* Copyright (C) 2020 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.ccsdk.oran.a1policymanagementservice.dmaap;
import com.google.common.collect.Iterables;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.TypeAdapterFactory;
import java.time.Duration;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.ServiceLoader;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.AsyncRestClient;
import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ApplicationConfig;
import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
/**
* The class fetches incoming requests from DMAAP. It uses the timeout parameter
* that lets the MessageRouter keep the connection with the Kafka open until
* requests are sent in.
*
* <p>
* this service will regularly check the configuration and start polling DMaaP
* if the configuration is added. If the DMaaP configuration is removed, then
* the service will stop polling and resume checking for configuration.
*
* <p>
* Each received request is processed by {@link DmaapMessageHandler}.
*/
@Component
public class DmaapMessageConsumer {
protected static final Duration TIME_BETWEEN_DMAAP_RETRIES = Duration.ofSeconds(10);
private static final Logger logger = LoggerFactory.getLogger(DmaapMessageConsumer.class);
private final ApplicationConfig applicationConfig;
private DmaapMessageHandler dmaapMessageHandler = null;
private final Gson gson;
@Value("${server.http-port}")
private int localServerHttpPort;
@Autowired
public DmaapMessageConsumer(ApplicationConfig applicationConfig) {
this.applicationConfig = applicationConfig;
GsonBuilder gsonBuilder = new GsonBuilder();
ServiceLoader.load(TypeAdapterFactory.class).forEach(gsonBuilder::registerTypeAdapterFactory);
gson = gsonBuilder.create();
}
/**
* Starts the consumer. If there is a DMaaP configuration, it will start polling
* for messages. Otherwise it will check regularly for the configuration.
*
* @return the running thread, for test purposes.
*/
public Thread start() {
Thread thread = new Thread(this::messageHandlingLoop);
thread.start();
return thread;
}
private void messageHandlingLoop() {
while (!isStopped()) {
try {
if (isDmaapConfigured()) {
Iterable<DmaapRequestMessage> dmaapMsgs = fetchAllMessages();
if (dmaapMsgs != null && Iterables.size(dmaapMsgs) > 0) {
logger.debug("Fetched all the messages from DMAAP and will start to process the messages");
for (DmaapRequestMessage msg : dmaapMsgs) {
processMsg(msg);
}
}
} else {
sleep(TIME_BETWEEN_DMAAP_RETRIES); // wait for configuration
}
} catch (Exception e) {
logger.warn("{}", e.getMessage());
sleep(TIME_BETWEEN_DMAAP_RETRIES);
}
}
}
protected boolean isStopped() {
return false;
}
protected boolean isDmaapConfigured() {
String producerTopicUrl = applicationConfig.getDmaapProducerTopicUrl();
String consumerTopicUrl = applicationConfig.getDmaapConsumerTopicUrl();
return (producerTopicUrl != null && consumerTopicUrl != null && !producerTopicUrl.isEmpty()
&& !consumerTopicUrl.isEmpty());
}
private <T> List<T> parseList(String jsonString, Class<T> clazz) {
List<T> result = new ArrayList<>();
JsonArray jsonArr = JsonParser.parseString(jsonString).getAsJsonArray();
for (JsonElement jsonElement : jsonArr) {
// The element can either be a JsonObject or a JsonString
if (jsonElement.isJsonPrimitive()) {
T json = gson.fromJson(jsonElement.getAsString(), clazz);
result.add(json);
} else {
T json = gson.fromJson(jsonElement.toString(), clazz);
result.add(json);
}
}
return result;
}
private void sendErrorResponse(String response) {
DmaapRequestMessage fakeRequest = ImmutableDmaapRequestMessage.builder() //
.apiVersion("") //
.correlationId("") //
.operation(DmaapRequestMessage.Operation.PUT) //
.originatorId("") //
.payload(Optional.empty()) //
.requestId("") //
.target("") //
.timestamp("") //
.url("URL") //
.build();
getDmaapMessageHandler().sendDmaapResponse(response, fakeRequest, HttpStatus.BAD_REQUEST).block();
}
List<DmaapRequestMessage> parseMessages(String jsonString) throws ServiceException {
try {
return parseList(jsonString, DmaapRequestMessage.class);
} catch (Exception e) {
sendErrorResponse("Not parsable request received, reason:" + e.toString() + ", input :" + jsonString);
throw new ServiceException("Could not parse incomming request. Reason :" + e.getMessage());
}
}
protected Iterable<DmaapRequestMessage> fetchAllMessages() throws ServiceException {
String topicUrl = this.applicationConfig.getDmaapConsumerTopicUrl();
AsyncRestClient consumer = getMessageRouterConsumer();
ResponseEntity<String> response = consumer.getForEntity(topicUrl).block();
logger.debug("DMaaP consumer received {} : {}", response.getStatusCode(), response.getBody());
if (response.getStatusCode().is2xxSuccessful()) {
return parseMessages(response.getBody());
} else {
throw new ServiceException("Cannot fetch because of Error respons: " + response.getStatusCode().toString()
+ " " + response.getBody());
}
}
private void processMsg(DmaapRequestMessage msg) {
logger.debug("Message Reveived from DMAAP : {}", msg);
getDmaapMessageHandler().handleDmaapMsg(msg);
}
protected DmaapMessageHandler getDmaapMessageHandler() {
if (this.dmaapMessageHandler == null) {
String pmsBaseUrl = "http://localhost:" + this.localServerHttpPort;
AsyncRestClient pmsClient = new AsyncRestClient(pmsBaseUrl, this.applicationConfig.getWebClientConfig());
AsyncRestClient producer = new AsyncRestClient(this.applicationConfig.getDmaapProducerTopicUrl(),
this.applicationConfig.getWebClientConfig());
this.dmaapMessageHandler = new DmaapMessageHandler(producer, pmsClient);
}
return this.dmaapMessageHandler;
}
protected void sleep(Duration duration) {
try {
Thread.sleep(duration.toMillis());
} catch (Exception e) {
logger.error("Failed to put the thread to sleep", e);
}
}
protected AsyncRestClient getMessageRouterConsumer() {
return new AsyncRestClient("", this.applicationConfig.getWebClientConfig());
}
}
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