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 com.google.gson.Gson;
  24 import com.google.gson.JsonArray;
  25 import com.google.gson.JsonElement;
  26 import io.netty.buffer.ByteBuf;
  27 import io.vavr.collection.HashMap;
  28 import java.nio.charset.StandardCharsets;
  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.api.MessageRouterSubscriber;
  40 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterPublishResponse;
  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.MessageRouterPublishRequest;
  43 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterPublishResponse;
  44 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeRequest;
  45 import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeResponse;
  46 import org.reactivestreams.Publisher;
  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 // TODO: This is a PoC. It's untested.
  55 public class MessageRouterClientImpl implements MessageRouterPublisher, MessageRouterSubscriber {
  56
  57     private static final Duration WINDOW_MAX_TIME = Duration.ofSeconds(1);
  58     private static final int WINDOW_MAX_SIZE = 512;
  59     private final RxHttpClient httpClient;
  60     private final Gson gson;
  61
  62     public MessageRouterClientImpl(RxHttpClient httpClient, Gson gson) {
  63         this.httpClient = httpClient;
  64         this.gson = gson;
  65     }
  66
  67     @Override
  68     public Flux<MessageRouterPublishResponse> put(
  69             MessageRouterPublishRequest request,
  70             Flux<? extends JsonElement> items) {
  71         return items.windowTimeout(WINDOW_MAX_SIZE, WINDOW_MAX_TIME).flatMap(subItems ->
  72                 subItems.collect(JsonArray::new, JsonArray::add)
  73                         .filter(arr -> arr.size() > 0)
  74                         .map(RequestBody::fromJson)
  75                         .flatMap(body -> httpClient.call(buildPostHttpRequest(request, body)))
  76                         .map(this::buildPutResponse));
  77     }
  78
  79     @Override
  80     public Mono<MessageRouterSubscribeResponse> get(MessageRouterSubscribeRequest request) {
  81         return httpClient.call(buildGetHttpRequest(request)).map(this::buildGetResponse);
  82     }
  83
  84     private @NotNull MessageRouterPublishResponse buildPutResponse(HttpResponse httpResponse) {
  85         final ImmutableMessageRouterPublishResponse.Builder builder =
  86                 ImmutableMessageRouterPublishResponse.builder();
  87         return httpResponse.successful()
  88                 ? builder.build()
  89                 : builder.failReason(extractFailReason(httpResponse)).build();
  90     }
  91
  92     private @NotNull MessageRouterSubscribeResponse buildGetResponse(HttpResponse httpResponse) {
  93         final ImmutableMessageRouterSubscribeResponse.Builder builder =
  94                 ImmutableMessageRouterSubscribeResponse.builder();
  95         return httpResponse.successful()
  96                 ? builder.items(httpResponse.bodyAsJson(StandardCharsets.UTF_8, gson, JsonArray.class)).build()
  97                 : builder.failReason(extractFailReason(httpResponse)).build();
  98     }
  99
 100     private String extractFailReason(HttpResponse httpResponse) {
 101         return String.format("%d %s%n%s", httpResponse.statusCode(), httpResponse.statusReason(),
 102                 httpResponse.bodyAsString());
 103     }
 104
 105     private @NotNull HttpRequest buildPostHttpRequest(MessageRouterPublishRequest request, RequestBody body) {
 106         return ImmutableHttpRequest.builder()
 107                 .method(HttpMethod.POST)
 108                 .url(request.sinkDefinition().topicUrl())
 109                 .diagnosticContext(request.diagnosticContext())
 110                 .customHeaders(HashMap.of(HttpHeaders.CONTENT_TYPE, request.contentType()))
 111                 .body(body)
 112                 .build();
 113     }
 114
 115     private @NotNull HttpRequest buildGetHttpRequest(MessageRouterSubscribeRequest request) {
 116         return ImmutableHttpRequest.builder()
 117                 .method(HttpMethod.GET)
 118                 .url(buildSubscribeUrl(request))
 119                 .diagnosticContext(request.diagnosticContext())
 120                 .build();
 121     }
 122
 123     private String buildSubscribeUrl(MessageRouterSubscribeRequest request) {
 124         return String.format("%s/%s/%s", request.sourceDefinition().topicUrl(), request.consumerGroup(), request.consumerId());
 125     }
 126 }