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/*
* ============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.dmaap.client.impl;
import static org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl.Commons.extractFailReason;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import io.vavr.collection.HashMap;
import io.vavr.collection.List;
import java.time.Duration;
import java.util.stream.Collectors;
import org.jetbrains.annotations.NotNull;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpHeaders;
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.RequestBody;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RxHttpClient;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.ContentType;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.api.MessageRouterPublisher;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterPublishResponse;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterPublishRequest;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterPublishResponse;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
/**
* @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
* @since March 2019
*/
public class MessageRouterPublisherImpl implements MessageRouterPublisher {
private final RxHttpClient httpClient;
private final int maxBatchSize;
private final Duration maxBatchDuration;
private static final Logger LOGGER = LoggerFactory.getLogger(MessageRouterPublisherImpl.class);
public MessageRouterPublisherImpl(RxHttpClient httpClient, int maxBatchSize, Duration maxBatchDuration) {
this.httpClient = httpClient;
this.maxBatchSize = maxBatchSize;
this.maxBatchDuration = maxBatchDuration;
}
@Override
public Flux<MessageRouterPublishResponse> put(
MessageRouterPublishRequest request,
Flux<? extends JsonElement> items) {
return items.bufferTimeout(maxBatchSize, maxBatchDuration)
.flatMap(subItems -> subItems.isEmpty() ? Mono.empty() : pushBatchToMr(request, List.ofAll(subItems)));
}
private Publisher<? extends MessageRouterPublishResponse> pushBatchToMr(
MessageRouterPublishRequest request,
List<JsonElement> batch) {
LOGGER.debug("Sending a batch of {} items to DMaaP MR", batch.size());
LOGGER.trace("The items to be sent: {}", batch);
return httpClient.call(buildHttpRequest(request, createBody(batch, request.contentType())))
.map(httpResponse -> buildResponse(httpResponse, batch));
}
private @NotNull RequestBody createBody(List<? extends JsonElement> subItems, ContentType contentType) {
if(contentType == ContentType.APPLICATION_JSON) {
final JsonArray elements = new JsonArray(subItems.size());
subItems.forEach(elements::add);
return RequestBody.fromJson(elements);
}else if(contentType == ContentType.TEXT_PLAIN){
String messages = subItems.map(JsonElement::toString)
.collect(Collectors.joining("\n"));
return RequestBody.fromString(messages);
}else throw new IllegalArgumentException("Unsupported content type: " + contentType);
}
private @NotNull HttpRequest buildHttpRequest(MessageRouterPublishRequest request, RequestBody body) {
return ImmutableHttpRequest.builder()
.method(HttpMethod.POST)
.url(request.sinkDefinition().topicUrl())
.diagnosticContext(request.diagnosticContext().withNewInvocationId())
.customHeaders(HashMap.of(HttpHeaders.CONTENT_TYPE, request.contentType().toString()))
.body(body)
.build();
}
private MessageRouterPublishResponse buildResponse(
HttpResponse httpResponse, List<JsonElement> batch) {
final ImmutableMessageRouterPublishResponse.Builder builder =
ImmutableMessageRouterPublishResponse.builder();
return httpResponse.successful()
? builder.items(batch).build()
: builder.failReason(extractFailReason(httpResponse)).build();
}
}
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