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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.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import java.time.Duration;
import java.util.ArrayList;
import java.util.List;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.AsyncRestClient;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.AsyncRestClientFactory;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.SecurityContext;
import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ApplicationConfig;
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.stereotype.Component;
import reactor.core.publisher.Flux;
import reactor.core.publisher.FluxSink;
import reactor.core.publisher.Mono;
/**
* 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;
private final AsyncRestClientFactory restClientFactory;
private final InfiniteFlux infiniteSubmitter = new InfiniteFlux();
@Value("${server.http-port}")
private int localServerHttpPort;
private static class InfiniteFlux {
private FluxSink<Integer> sink;
private int counter = 0;
public synchronized Flux<Integer> start() {
stop();
return Flux.create(this::next).doOnRequest(this::onRequest);
}
public synchronized void stop() {
if (this.sink != null) {
this.sink.complete();
this.sink = null;
}
}
void onRequest(long no) {
for (long i = 0; i < no; ++i) {
sink.next(counter++);
}
}
void next(FluxSink<Integer> sink) {
this.sink = sink;
sink.next(counter++);
}
}
@Autowired
public DmaapMessageConsumer(ApplicationConfig applicationConfig, SecurityContext securityContext) {
this.applicationConfig = applicationConfig;
GsonBuilder gsonBuilder = new GsonBuilder();
this.gson = gsonBuilder.create();
this.restClientFactory = new AsyncRestClientFactory(applicationConfig.getWebClientConfig(), securityContext);
}
/**
* Starts the DMAAP consumer. If there is a DMaaP configuration, it will start
* polling for messages. Otherwise it will check regularly for the
* configuration.
*
*/
public void start() {
infiniteSubmitter.stop();
createTask().subscribe(//
value -> logger.debug("DmaapMessageConsumer next: {}", value), //
throwable -> logger.error("DmaapMessageConsumer error: {}", throwable.getMessage()), //
() -> logger.warn("DmaapMessageConsumer stopped") //
);
}
protected Flux<String> createTask() {
return infiniteFlux() //
.flatMap(notUsed -> fetchFromDmaap(), 1) //
.doOnNext(message -> logger.debug("Message Reveived from DMAAP : {}", message)) //
.flatMap(this::parseReceivedMessage, 1)//
.flatMap(this::handleDmaapMsg, 1) //
.onErrorResume(throwable -> Mono.empty());
}
protected Flux<Integer> infiniteFlux() {
return infiniteSubmitter.start();
}
protected Mono<Object> delay() {
return Mono.delay(TIME_BETWEEN_DMAAP_RETRIES).flatMap(o -> Mono.empty());
}
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;
}
protected boolean isDmaapConfigured() {
String producerTopicUrl = applicationConfig.getDmaapProducerTopicUrl();
String consumerTopicUrl = applicationConfig.getDmaapConsumerTopicUrl();
return (producerTopicUrl != null && consumerTopicUrl != null && !producerTopicUrl.isEmpty()
&& !consumerTopicUrl.isEmpty());
}
protected Mono<String> handleDmaapMsg(DmaapRequestMessage dmaapRequestMessage) {
return getDmaapMessageHandler().handleDmaapMsg(dmaapRequestMessage);
}
protected Mono<String> getFromMessageRouter(String topicUrl) {
logger.trace("getFromMessageRouter {}", topicUrl);
AsyncRestClient c = restClientFactory.createRestClientNoHttpProxy("");
return c.get(topicUrl);
}
protected Flux<DmaapRequestMessage> parseReceivedMessage(String jsonString) {
try {
logger.trace("parseMessages {}", jsonString);
return Flux.fromIterable(parseList(jsonString, DmaapRequestMessage.class));
} catch (Exception e) {
logger.error("parseMessages error {}", jsonString);
return sendErrorResponse("Could not parse: " + jsonString) //
.flatMapMany(s -> Flux.empty());
}
}
protected Mono<String> sendErrorResponse(String response) {
logger.debug("sendErrorResponse {}", response);
DmaapRequestMessage fakeRequest = DmaapRequestMessage.builder() //
.apiVersion("") //
.correlationId("") //
.operation(DmaapRequestMessage.Operation.PUT) //
.originatorId("") //
.payload(null) //
.requestId("") //
.target("") //
.timestamp("") //
.url("URL") //
.build();
return getDmaapMessageHandler().sendDmaapResponse(response, fakeRequest, HttpStatus.BAD_REQUEST) //
.onErrorResume(e -> Mono.empty());
}
private Mono<String> fetchFromDmaap() {
if (!this.isDmaapConfigured()) {
return delay().flatMap(o -> Mono.empty());
}
logger.debug("fetchFromDmaap");
String topicUrl = this.applicationConfig.getDmaapConsumerTopicUrl();
return getFromMessageRouter(topicUrl) //
.onErrorResume(throwable -> delay().flatMap(o -> Mono.empty()));
}
private DmaapMessageHandler getDmaapMessageHandler() {
if (this.dmaapMessageHandler == null) {
String pmsBaseUrl = "http://localhost:" + this.localServerHttpPort;
AsyncRestClient pmsClient = restClientFactory.createRestClientNoHttpProxy(pmsBaseUrl);
AsyncRestClient producer =
restClientFactory.createRestClientNoHttpProxy(this.applicationConfig.getDmaapProducerTopicUrl());
this.dmaapMessageHandler = new DmaapMessageHandler(producer, pmsClient);
}
return this.dmaapMessageHandler;
}
}
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