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.netty.handler.ssl.SslContext;
  23 import io.vavr.collection.Stream;
  24 import java.util.stream.Collectors;
  25 import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28 import reactor.core.publisher.Mono;
  29 import reactor.netty.http.client.HttpClient;
  30 import reactor.netty.http.client.HttpClient.ResponseReceiver;
  31 import reactor.netty.http.client.HttpClientRequest;
  32 import reactor.netty.http.client.HttpClientResponse;
  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     public static RxHttpClient create() {
  43         return new RxHttpClient(HttpClient.create());
  44     }
  45
  46     // TODO: hide netty from public api (io.netty.handler.ssl.SslContext)
  47     public static RxHttpClient create(SslContext sslContext) {
  48         return new RxHttpClient(HttpClient.create().secure(sslContextSpec -> sslContextSpec.sslContext(sslContext)));
  49     }
  50
  51     RxHttpClient(HttpClient httpClient) {
  52         this.httpClient = httpClient;
  53     }
  54
  55     public Mono<HttpResponse> call(HttpRequest request) {
  56         return prepareRequest(request)
  57                 .responseSingle((resp, content) ->
  58                         content.asByteArray()
  59                                 .defaultIfEmpty(new byte[0])
  60                                 .map(bytes -> new NettyHttpResponse(request.url(), resp.status(), bytes)));
  61     }
  62
  63     ResponseReceiver<?> prepareRequest(HttpRequest request) {
  64         final HttpClient theClient = httpClient
  65                 .doOnRequest((req, conn) -> logRequest(request.diagnosticContext(), req))
  66                 .doOnResponse((rsp, conn) -> logResponse(request.diagnosticContext(), rsp))
  67                 .headers(hdrs -> request.headers().forEach(hdr -> hdrs.set(hdr._1, hdr._2)));
  68
  69         return prepareBody(request, theClient);
  70     }
  71
  72     private ResponseReceiver<?> prepareBody(HttpRequest request, HttpClient theClient) {
  73         if (request.body() == null) {
  74             return prepareBodyWithoutContents(request, theClient);
  75         } else {
  76             return request.body().length() == null
  77                     ? prepareBodyChunked(request, theClient)
  78                     : prepareBodyUnchunked(request, theClient);
  79         }
  80     }
  81
  82     private ResponseReceiver<?> prepareBodyChunked(HttpRequest request, HttpClient theClient) {
  83         return theClient
  84                 .chunkedTransfer(true)
  85                 .request(request.method().asNetty())
  86                 .send(request.body().contents())
  87                 .uri(request.url());
  88     }
  89
  90     private ResponseReceiver<?> prepareBodyUnchunked(HttpRequest request, HttpClient theClient) {
  91         return theClient
  92                 .headers(hdrs -> hdrs.set(HttpHeaders.CONTENT_LENGTH, request.body().length().toString()))
  93                 .request(request.method().asNetty())
  94                 .send(request.body().contents())
  95                 .uri(request.url());
  96     }
  97
  98     private ResponseReceiver<?> prepareBodyWithoutContents(HttpRequest request, HttpClient theClient) {
  99         return theClient
 100                 .request(request.method().asNetty())
 101                 .uri(request.url());
 102     }
 103
 104     private void logRequest(RequestDiagnosticContext context, HttpClientRequest httpClientRequest) {
 105         context.withSlf4jMdc(LOGGER.isDebugEnabled(), () -> {
 106             LOGGER.debug("Request: {} {} {}", httpClientRequest.method(), httpClientRequest.uri(),
 107                     httpClientRequest.requestHeaders());
 108             if (LOGGER.isTraceEnabled()) {
 109                 final String headers = Stream.ofAll(httpClientRequest.requestHeaders())
 110                         .map(entry -> entry.getKey() + "=" + entry.getValue())
 111                         .collect(Collectors.joining("\n"));
 112                 LOGGER.trace(headers);
 113             }
 114         });
 115     }
 116
 117     private void logResponse(RequestDiagnosticContext context, HttpClientResponse httpClientResponse) {
 118         context.withSlf4jMdc(LOGGER.isDebugEnabled(),
 119                 () -> LOGGER.debug("Response status: {}", httpClientResponse.status()));
 120     }
 121 }