rest-services/dmaap-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/dmaap/client/impl/MessageRouterPublisherImpl.java

   1 /*
   2  * ============LICENSE_START====================================
   3  * DCAEGEN2-SERVICES-SDK
   4  * =========================================================
   5  * Copyright (C) 2019 Nokia. All rights reserved.
   6  * =========================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *       http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=====================================
  19  */
  20
  21 package org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl;
  22
  23 import static org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl.Commons.extractFailReason;
  24
  25 import com.google.gson.JsonArray;
  26 import com.google.gson.JsonElement;
  27 import io.vavr.collection.HashMap;
  28 import io.vavr.collection.List;
  29 import java.time.Duration;
  30 import java.util.stream.Collectors;
  31 import org.jetbrains.annotations.NotNull;
  32 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpHeaders;
  33 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpMethod;
  34 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpRequest;
  35 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpResponse;
  36 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.ImmutableHttpRequest;
  37 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RequestBody;
  38 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RxHttpClient;
  39 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.ContentType;
  40 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.api.MessageRouterPublisher;
  41 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterPublishResponse;
  42 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterPublishRequest;
  43 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterPublishResponse;
  44 import org.reactivestreams.Publisher;
  45 import org.slf4j.Logger;
  46 import org.slf4j.LoggerFactory;
  47 import reactor.core.publisher.Flux;
  48 import reactor.core.publisher.Mono;
  49
  50 /**
  51  * @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
  52  * @since March 2019
  53  */
  54 public class MessageRouterPublisherImpl implements MessageRouterPublisher {
  55     private final RxHttpClient httpClient;
  56     private final int maxBatchSize;
  57     private final Duration maxBatchDuration;
  58     private static final Logger LOGGER = LoggerFactory.getLogger(MessageRouterPublisherImpl.class);
  59
  60     public MessageRouterPublisherImpl(RxHttpClient httpClient, int maxBatchSize, Duration maxBatchDuration) {
  61         this.httpClient = httpClient;
  62         this.maxBatchSize = maxBatchSize;
  63         this.maxBatchDuration = maxBatchDuration;
  64     }
  65
  66     @Override
  67     public Flux<MessageRouterPublishResponse> put(
  68             MessageRouterPublishRequest request,
  69             Flux<? extends JsonElement> items) {
  70         return items.bufferTimeout(maxBatchSize, maxBatchDuration)
  71                 .flatMap(subItems -> subItems.isEmpty() ? Mono.empty() : pushBatchToMr(request, List.ofAll(subItems)));
  72     }
  73
  74     private Publisher<? extends MessageRouterPublishResponse> pushBatchToMr(
  75             MessageRouterPublishRequest request,
  76             List<JsonElement> batch) {
  77         LOGGER.debug("Sending a batch of {} items to DMaaP MR", batch.size());
  78         LOGGER.trace("The items to be sent: {}", batch);
  79         return httpClient.call(buildHttpRequest(request, createBody(batch, request.contentType())))
  80                 .map(httpResponse -> buildResponse(httpResponse, batch));
  81     }
  82
  83     private @NotNull RequestBody createBody(List<? extends JsonElement> subItems, ContentType contentType) {
  84         if(contentType == ContentType.APPLICATION_JSON) {
  85             final JsonArray elements = new JsonArray(subItems.size());
  86             subItems.forEach(elements::add);
  87             return RequestBody.fromJson(elements);
  88         }else if(contentType == ContentType.TEXT_PLAIN){
  89             String messages = subItems.map(JsonElement::toString)
  90                     .collect(Collectors.joining("\n"));
  91             return RequestBody.fromString(messages);
  92         }else throw new IllegalArgumentException("Unsupported content type: " + contentType);
  93     }
  94
  95     private @NotNull HttpRequest buildHttpRequest(MessageRouterPublishRequest request, RequestBody body) {
  96         return ImmutableHttpRequest.builder()
  97                 .method(HttpMethod.POST)
  98                 .url(request.sinkDefinition().topicUrl())
  99                 .diagnosticContext(request.diagnosticContext().withNewInvocationId())
 100                 .customHeaders(HashMap.of(HttpHeaders.CONTENT_TYPE, request.contentType().toString()))
 101                 .body(body)
 102                 .build();
 103     }
 104
 105     private MessageRouterPublishResponse buildResponse(
 106             HttpResponse httpResponse, List<JsonElement> batch) {
 107         final ImmutableMessageRouterPublishResponse.Builder builder =
 108                 ImmutableMessageRouterPublishResponse.builder();
 109
 110         return httpResponse.successful()
 111                 ? builder.items(batch).build()
 112                 : builder.failReason(extractFailReason(httpResponse)).build();
 113     }
 114 }