rest-services/http-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/adapters/http/RxHttpClient.java

   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 org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26 import reactor.core.publisher.Mono;
  27 import reactor.netty.http.client.HttpClient;
  28 import reactor.netty.http.client.HttpClient.ResponseReceiver;
  29 import reactor.netty.http.client.HttpClientRequest;
  30 import reactor.netty.http.client.HttpClientResponse;
  31
  32 import java.util.stream.Collectors;
  33
  34 /**
  35  * @since 1.1.4
  36  */
  37 public class RxHttpClient {
  38
  39     private static final Logger LOGGER = LoggerFactory.getLogger(RxHttpClient.class);
  40     private final HttpClient httpClient;
  41
  42     RxHttpClient(HttpClient httpClient) {
  43         this.httpClient = httpClient;
  44     }
  45
  46     public Mono<HttpResponse> call(HttpRequest request) {
  47         return prepareRequest(request)
  48                 .responseSingle((resp, content) ->
  49                         content.asByteArray()
  50                                 .defaultIfEmpty(new byte[0])
  51                                 .map(bytes -> new NettyHttpResponse(request.url(), resp.status(), bytes)));
  52     }
  53
  54     ResponseReceiver<?> prepareRequest(HttpRequest request) {
  55         final HttpClient theClient = httpClient
  56                 .doOnRequest((req, conn) -> logRequest(request.diagnosticContext(), req))
  57                 .doOnResponse((rsp, conn) -> logResponse(request.diagnosticContext(), rsp))
  58                 .headers(hdrs -> request.headers().forEach(hdr -> hdrs.set(hdr._1, hdr._2)));
  59
  60         return prepareBody(request, theClient);
  61     }
  62
  63     private ResponseReceiver<?> prepareBody(HttpRequest request, HttpClient theClient) {
  64         if (request.body() == null) {
  65             return prepareBodyWithoutContents(request, theClient);
  66         } else {
  67             return request.body().length() == null
  68                     ? prepareBodyChunked(request, theClient)
  69                     : prepareBodyUnchunked(request, theClient);
  70         }
  71     }
  72
  73     private ResponseReceiver<?> prepareBodyChunked(HttpRequest request, HttpClient theClient) {
  74         return theClient
  75                 .headers(hdrs -> hdrs.set(HttpHeaders.TRANSFER_ENCODING_TYPE, HttpHeaders.CHUNKED))
  76                 .request(request.method().asNetty())
  77                 .send(request.body().contents())
  78                 .uri(request.url());
  79     }
  80
  81     private ResponseReceiver<?> prepareBodyUnchunked(HttpRequest request, HttpClient theClient) {
  82         return theClient
  83                 .headers(hdrs -> hdrs.set(HttpHeaders.CONTENT_LENGTH, request.body().length().toString()))
  84                 .request(request.method().asNetty())
  85                 .send(request.body().contents())
  86                 .uri(request.url());
  87     }
  88
  89     private ResponseReceiver<?> prepareBodyWithoutContents(HttpRequest request, HttpClient theClient) {
  90         return theClient
  91                 .request(request.method().asNetty())
  92                 .uri(request.url());
  93     }
  94
  95     private void logRequest(RequestDiagnosticContext context, HttpClientRequest httpClientRequest) {
  96         context.withSlf4jMdc(LOGGER.isDebugEnabled(), () -> {
  97             LOGGER.debug("Request: {} {} {}", httpClientRequest.method(), httpClientRequest.uri(),
  98                     httpClientRequest.requestHeaders());
  99             if (LOGGER.isTraceEnabled()) {
 100                 final String headers = Stream.ofAll(httpClientRequest.requestHeaders())
 101                         .map(entry -> entry.getKey() + "=" + entry.getValue())
 102                         .collect(Collectors.joining("\n"));
 103                 LOGGER.trace(headers);
 104             }
 105         });
 106     }
 107
 108     private void logResponse(RequestDiagnosticContext context, HttpClientResponse httpClientResponse) {
 109         context.withSlf4jMdc(LOGGER.isDebugEnabled(),
 110                 () -> LOGGER.debug("Response status: {}", httpClientResponse.status()));
 111     }
 112 }