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

   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 com.google.gson.Gson;
  24 import com.google.gson.JsonArray;
  25 import com.google.gson.JsonElement;
  26 import com.google.gson.JsonParser;
  27 import io.netty.handler.timeout.ReadTimeoutException;
  28 import io.vavr.collection.List;
  29 import io.vavr.control.Option;
  30 import org.jetbrains.annotations.NotNull;
  31 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpMethod;
  32 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpRequest;
  33 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpResponse;
  34 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.ImmutableHttpRequest;
  35 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RxHttpClient;
  36 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.exceptions.RetryableException;
  37 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.api.MessageRouterSubscriber;
  38 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.error.ClientErrorReason;
  39 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.error.ClientErrorReasonPresenter;
  40 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.error.ClientErrorReasons;
  41 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterSubscribeResponse;
  42 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeRequest;
  43 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeResponse;
  44 import org.slf4j.Logger;
  45 import org.slf4j.LoggerFactory;
  46 import reactor.core.publisher.Mono;
  47
  48 import java.net.ConnectException;
  49 import java.nio.charset.StandardCharsets;
  50
  51 import static org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl.Commons.extractFailReason;
  52
  53 /**
  54  * @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
  55  * @since March 2019
  56  */
  57 public class MessageRouterSubscriberImpl implements MessageRouterSubscriber {
  58     private final RxHttpClient httpClient;
  59     private final Gson gson;
  60     private final ClientErrorReasonPresenter clientErrorReasonPresenter;
  61     private static final Logger LOGGER = LoggerFactory.getLogger(MessageRouterSubscriberImpl.class);
  62
  63     public MessageRouterSubscriberImpl(RxHttpClient httpClient, Gson gson,
  64                                        ClientErrorReasonPresenter clientErrorReasonPresenter) {
  65         this.httpClient = httpClient;
  66         this.gson = gson;
  67         this.clientErrorReasonPresenter = clientErrorReasonPresenter;
  68     }
  69
  70     @Override
  71     public Mono<MessageRouterSubscribeResponse> get(MessageRouterSubscribeRequest request) {
  72         LOGGER.debug("Requesting new items from DMaaP MR: {}", request);
  73         return httpClient.call(buildGetHttpRequest(request))
  74                 .map(this::buildGetResponse)
  75                 .doOnError(ReadTimeoutException.class,
  76                         e -> LOGGER.error("Timeout exception occurred when subscribe items from DMaaP MR", e))
  77                 .onErrorResume(ReadTimeoutException.class, e -> buildErrorResponse(ClientErrorReasons.TIMEOUT))
  78                 .doOnError(ConnectException.class, e -> LOGGER.error("DMaaP MR is unavailable, {}", e.getMessage()))
  79                 .onErrorResume(ConnectException.class, e -> buildErrorResponse(ClientErrorReasons.SERVICE_UNAVAILABLE))
  80                 .onErrorResume(RetryableException.class, e -> Mono.just(buildGetResponse(e.getResponse())));
  81     }
  82
  83     private @NotNull HttpRequest buildGetHttpRequest(MessageRouterSubscribeRequest request) {
  84         ImmutableHttpRequest.Builder requestBuilder = ImmutableHttpRequest.builder()
  85                 .method(HttpMethod.GET)
  86                 .url(buildSubscribeUrl(request))
  87                 .diagnosticContext(request.diagnosticContext().withNewInvocationId());
  88
  89         return Option.of(request.timeoutConfig())
  90                 .map(timeoutConfig -> requestBuilder.timeout(timeoutConfig.getTimeout()).build())
  91                 .getOrElse(requestBuilder::build);
  92     }
  93
  94     private @NotNull MessageRouterSubscribeResponse buildGetResponse(HttpResponse httpResponse) {
  95         final ImmutableMessageRouterSubscribeResponse.Builder builder =
  96                 ImmutableMessageRouterSubscribeResponse.builder();
  97         return httpResponse.successful()
  98                 ? builder.items(getAsJsonElements(httpResponse)).build()
  99                 : builder.failReason(extractFailReason(httpResponse)).build();
 100     }
 101
 102     private List<JsonElement> getAsJsonElements(HttpResponse httpResponse) {
 103         JsonArray bodyAsJsonArray = httpResponse
 104                 .bodyAsJson(StandardCharsets.UTF_8, gson, JsonArray.class);
 105
 106         return List.ofAll(bodyAsJsonArray).map(arrayElement -> JsonParser.parseString(arrayElement.getAsString()));
 107     }
 108
 109     private String buildSubscribeUrl(MessageRouterSubscribeRequest request) {
 110         return String.format("%s/%s/%s", request.sourceDefinition().topicUrl(), request.consumerGroup(),
 111                 request.consumerId());
 112     }
 113
 114     private Mono<MessageRouterSubscribeResponse> buildErrorResponse(ClientErrorReason clientErrorReason) {
 115         String failReason = clientErrorReasonPresenter.present(clientErrorReason);
 116         return Mono.just(ImmutableMessageRouterSubscribeResponse.builder()
 117                 .failReason(failReason)
 118                 .build());
 119     }
 120 }