gerrit.onap Code Review - dcaegen2/services/sdk.git/blob

   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 org.jetbrains.annotations.NotNull;
  31 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpHeaders;
  32 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpMethod;
  33 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpRequest;
  34 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpResponse;
  35 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.ImmutableHttpRequest;
  36 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RequestBody;
  37 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RxHttpClient;
  38 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.api.MessageRouterPublisher;
  39 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterPublishResponse;
  40 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterPublishRequest;
  41 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterPublishResponse;
  42 import org.reactivestreams.Publisher;
  43 import reactor.core.publisher.Flux;
  44 import reactor.core.publisher.Mono;
  45
  46 /**
  47  * @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
  48  * @since March 2019
  49  */
  50 // TODO: This is a PoC. It's untested.
  51 public class MessageRouterPublisherImpl implements MessageRouterPublisher {
  52     private final RxHttpClient httpClient;
  53     private final int maxBatchSize;
  54     private final Duration maxBatchDuration;
  55
  56     public MessageRouterPublisherImpl(RxHttpClient httpClient, int maxBatchSize, Duration maxBatchDuration) {
  57         this.httpClient = httpClient;
  58         this.maxBatchSize = maxBatchSize;
  59         this.maxBatchDuration = maxBatchDuration;
  60     }
  61
  62     @Override
  63     public Flux<MessageRouterPublishResponse> put(
  64             MessageRouterPublishRequest request,
  65             Flux<? extends JsonElement> items) {
  66         return items.bufferTimeout(maxBatchSize, maxBatchDuration)
  67                 .flatMap(subItems -> subItems.isEmpty() ? Mono.empty() : pushBatchToMr(request, List.ofAll(subItems)));
  68     }
  69
  70     private Publisher<? extends MessageRouterPublishResponse> pushBatchToMr(
  71             MessageRouterPublishRequest request,
  72             List<JsonElement> batch) {
  73         return httpClient.call(buildHttpRequest(request, asJsonBody(batch)))
  74                 .map(httpResponse -> buildResponse(httpResponse, batch));
  75     }
  76
  77     private @NotNull RequestBody asJsonBody(List<? extends JsonElement> subItems) {
  78         final JsonArray elements = new JsonArray(subItems.size());
  79         subItems.forEach(elements::add);
  80         return RequestBody.fromJson(elements);
  81     }
  82
  83     private @NotNull HttpRequest buildHttpRequest(MessageRouterPublishRequest request, RequestBody body) {
  84         return ImmutableHttpRequest.builder()
  85                 .method(HttpMethod.POST)
  86                 .url(request.sinkDefinition().topicUrl())
  87                 .diagnosticContext(request.diagnosticContext())
  88                 .customHeaders(HashMap.of(HttpHeaders.CONTENT_TYPE, request.contentType()))
  89                 .body(body)
  90                 .build();
  91     }
  92
  93     private MessageRouterPublishResponse buildResponse(
  94             HttpResponse httpResponse, List<JsonElement> batch) {
  95         final ImmutableMessageRouterPublishResponse.Builder builder =
  96                 ImmutableMessageRouterPublishResponse.builder();
  97         return httpResponse.successful()
  98                 ? builder.items(batch).build()
  99                 : builder.failReason(extractFailReason(httpResponse)).build();
 100     }
 101 }