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 package org.onap.dcaegen2.services.sdk.rest.services.adapters.http;
  21
  22 import io.vavr.collection.Stream;
  23 import java.util.stream.Collectors;
  24 import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27 import reactor.core.publisher.Mono;
  28 import reactor.netty.http.client.HttpClient;
  29 import reactor.netty.http.client.HttpClient.ResponseReceiver;
  30 import reactor.netty.http.client.HttpClientRequest;
  31 import reactor.netty.http.client.HttpClientResponse;
  32
  33 /**
  34  * @since 1.1.4
  35  */
  36 public class RxHttpClient {
  37
  38     private static final Logger LOGGER = LoggerFactory.getLogger(RxHttpClient.class);
  39     private final HttpClient httpClient;
  40
  41     RxHttpClient(HttpClient httpClient) {
  42         this.httpClient = httpClient;
  43     }
  44
  45     public Mono<HttpResponse> call(HttpRequest request) {
  46         return prepareRequest(request)
  47                 .responseSingle((resp, content) ->
  48                         content.asByteArray()
  49                                 .defaultIfEmpty(new byte[0])
  50                                 .map(bytes -> new NettyHttpResponse(request.url(), resp.status(), bytes)));
  51     }
  52
  53     ResponseReceiver<?> prepareRequest(HttpRequest request) {
  54         final HttpClient theClient = httpClient
  55                 .doOnRequest((req, conn) -> logRequest(request.diagnosticContext(), req))
  56                 .doOnResponse((rsp, conn) -> logResponse(request.diagnosticContext(), rsp))
  57                 .headers(hdrs -> request.headers().forEach(hdr -> hdrs.set(hdr._1, hdr._2)));
  58
  59         return prepareBody(request, theClient);
  60     }
  61
  62     private ResponseReceiver<?> prepareBody(HttpRequest request, HttpClient theClient) {
  63         if (request.body() == null) {
  64             return prepareBodyWithoutContents(request, theClient);
  65         } else {
  66             return request.body().length() == null
  67                     ? prepareBodyChunked(request, theClient)
  68                     : prepareBodyUnchunked(request, theClient);
  69         }
  70     }
  71
  72     private ResponseReceiver<?> prepareBodyChunked(HttpRequest request, HttpClient theClient) {
  73         return theClient
  74                 .chunkedTransfer(true)
  75                 .request(request.method().asNetty())
  76                 .send(request.body().contents())
  77                 .uri(request.url());
  78     }
  79
  80     private ResponseReceiver<?> prepareBodyUnchunked(HttpRequest request, HttpClient theClient) {
  81         return theClient
  82                 .headers(hdrs -> hdrs.set(HttpHeaders.CONTENT_LENGTH, request.body().length().toString()))
  83                 .request(request.method().asNetty())
  84                 .send(request.body().contents())
  85                 .uri(request.url());
  86     }
  87
  88     private ResponseReceiver<?> prepareBodyWithoutContents(HttpRequest request, HttpClient theClient) {
  89         return theClient
  90                 .request(request.method().asNetty())
  91                 .uri(request.url());
  92     }
  93
  94     private void logRequest(RequestDiagnosticContext context, HttpClientRequest httpClientRequest) {
  95         context.withSlf4jMdc(LOGGER.isDebugEnabled(), () -> {
  96             LOGGER.debug("Request: {} {} {}", httpClientRequest.method(), httpClientRequest.uri(),
  97                     httpClientRequest.requestHeaders());
  98             if (LOGGER.isTraceEnabled()) {
  99                 final String headers = Stream.ofAll(httpClientRequest.requestHeaders())
 100                         .map(entry -> entry.getKey() + "=" + entry.getValue())
 101                         .collect(Collectors.joining("\n"));
 102                 LOGGER.trace(headers);
 103             }
 104         });
 105     }
 106
 107     private void logResponse(RequestDiagnosticContext context, HttpClientResponse httpClientResponse) {
 108         context.withSlf4jMdc(LOGGER.isDebugEnabled(),
 109                 () -> LOGGER.debug("Response status: {}", httpClientResponse.status()));
 110     }
 111 }