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

   1 /*
   2  * ============LICENSE_START====================================
   3  * DCAEGEN2-SERVICES-SDK
   4  * =========================================================
   5  * Copyright (C) 2019-2021 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.Gson;
  26 import com.google.gson.JsonArray;
  27 import com.google.gson.JsonElement;
  28 import com.google.gson.JsonParser;
  29 import io.netty.handler.timeout.ReadTimeoutException;
  30 import io.vavr.collection.List;
  31 import java.nio.charset.StandardCharsets;
  32
  33 import io.vavr.control.Option;
  34 import org.jetbrains.annotations.NotNull;
  35 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpMethod;
  36 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpRequest;
  37 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpResponse;
  38 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.ImmutableHttpRequest;
  39 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RxHttpClient;
  40 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.api.MessageRouterSubscriber;
  41 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.error.ClientErrorReason;
  42 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.error.ClientErrorReasonPresenter;
  43 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.error.ClientErrorReasons;
  44 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterSubscribeResponse;
  45 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeRequest;
  46 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeResponse;
  47 import org.slf4j.Logger;
  48 import org.slf4j.LoggerFactory;
  49 import reactor.core.publisher.Mono;
  50
  51 /**
  52  * @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
  53  * @since March 2019
  54  */
  55 public class MessageRouterSubscriberImpl implements MessageRouterSubscriber {
  56     private final RxHttpClient httpClient;
  57     private final Gson gson;
  58     private static final Logger LOGGER = LoggerFactory.getLogger(MessageRouterSubscriberImpl.class);
  59
  60     public MessageRouterSubscriberImpl(RxHttpClient httpClient, Gson gson) {
  61         this.httpClient = httpClient;
  62         this.gson = gson;
  63     }
  64
  65     @Override
  66     public Mono<MessageRouterSubscribeResponse> get(MessageRouterSubscribeRequest request) {
  67         LOGGER.debug("Requesting new items from DMaaP MR: {}", request);
  68         return httpClient.call(buildGetHttpRequest(request))
  69                 .map(this::buildGetResponse)
  70                 .doOnError(ReadTimeoutException.class, e -> LOGGER.error("Timeout exception occurred when subscribe items from DMaaP MR", e))
  71                 .onErrorResume(ReadTimeoutException.class, e -> createErrorResponse(ClientErrorReasons.TIMEOUT));
  72     }
  73
  74
  75     private @NotNull HttpRequest buildGetHttpRequest(MessageRouterSubscribeRequest request) {
  76         ImmutableHttpRequest.Builder requestBuilder = ImmutableHttpRequest.builder()
  77                 .method(HttpMethod.GET)
  78                 .url(buildSubscribeUrl(request))
  79                 .diagnosticContext(request.diagnosticContext().withNewInvocationId());
  80
  81         return Option.of(request.timeoutConfig())
  82                 .map(timeoutConfig -> requestBuilder.timeout(timeoutConfig.getTimeout()).build())
  83                 .getOrElse(requestBuilder::build);
  84     }
  85
  86     private @NotNull MessageRouterSubscribeResponse buildGetResponse(HttpResponse httpResponse) {
  87         final ImmutableMessageRouterSubscribeResponse.Builder builder =
  88                 ImmutableMessageRouterSubscribeResponse.builder();
  89         return httpResponse.successful()
  90                 ? builder.items(getAsJsonElements(httpResponse)).build()
  91                 : builder.failReason(extractFailReason(httpResponse)).build();
  92     }
  93
  94     private List<JsonElement> getAsJsonElements(HttpResponse httpResponse){
  95         JsonArray bodyAsJsonArray = httpResponse
  96                 .bodyAsJson(StandardCharsets.UTF_8, gson, JsonArray.class);
  97
  98         return List.ofAll(bodyAsJsonArray).map(arrayElement -> JsonParser.parseString(arrayElement.getAsString()));
  99     }
 100
 101     private String buildSubscribeUrl(MessageRouterSubscribeRequest request) {
 102         return String.format("%s/%s/%s", request.sourceDefinition().topicUrl(), request.consumerGroup(),
 103                 request.consumerId());
 104     }
 105
 106     private Mono<MessageRouterSubscribeResponse> createErrorResponse(ClientErrorReason clientErrorReason) {
 107         String failReason = ClientErrorReasonPresenter.present(clientErrorReason);
 108         return Mono.just(ImmutableMessageRouterSubscribeResponse.builder()
 109                 .failReason(failReason)
 110                 .build());
 111     }
 112 }