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) 2019-2020 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 io.vavr.control.Option;
  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 import java.util.stream.Collectors;
  34
  35 /**
  36  * @since 1.1.4
  37  */
  38 public class RxHttpClient {
  39
  40     private static final Logger LOGGER = LoggerFactory.getLogger(RxHttpClient.class);
  41     private final HttpClient httpClient;
  42
  43     RxHttpClient(HttpClient httpClient) {
  44         this.httpClient = httpClient;
  45     }
  46
  47     public Mono<HttpResponse> call(HttpRequest request) {
  48         return prepareRequest(request)
  49                 .responseSingle((resp, content) ->
  50                         content.asByteArray()
  51                                 .defaultIfEmpty(new byte[0])
  52                                 .map(bytes -> new NettyHttpResponse(request.url(), resp.status(), bytes)));
  53     }
  54
  55     ResponseReceiver<?> prepareRequest(HttpRequest request) {
  56         final HttpClient simpleClient = httpClient
  57                 .doOnRequest((req, conn) -> logRequest(request.diagnosticContext(), req))
  58                 .doOnResponse((rsp, conn) -> logResponse(request.diagnosticContext(), rsp))
  59                 .headers(hdrs -> request.headers().forEach(hdr -> hdrs.set(hdr._1, hdr._2)));
  60
  61         final HttpClient theClient = Option.of(request.timeout())
  62                 .map(simpleClient::responseTimeout)
  63                 .getOrElse(simpleClient);
  64
  65         return prepareBody(request, theClient);
  66     }
  67
  68     private ResponseReceiver<?> prepareBody(HttpRequest request, HttpClient theClient) {
  69         if (request.body() == null) {
  70             return prepareBodyWithoutContents(request, theClient);
  71         } else {
  72             return request.body().length() == null
  73                     ? prepareBodyChunked(request, theClient)
  74                     : prepareBodyUnchunked(request, theClient);
  75         }
  76     }
  77
  78     private ResponseReceiver<?> prepareBodyChunked(HttpRequest request, HttpClient theClient) {
  79         return theClient
  80                 .headers(hdrs -> hdrs.set(HttpHeaders.TRANSFER_ENCODING_TYPE, HttpHeaders.CHUNKED))
  81                 .request(request.method().asNetty())
  82                 .send(request.body().contents())
  83                 .uri(request.url());
  84     }
  85
  86     private ResponseReceiver<?> prepareBodyUnchunked(HttpRequest request, HttpClient theClient) {
  87         return theClient
  88                 .headers(hdrs -> hdrs.set(HttpHeaders.CONTENT_LENGTH, request.body().length().toString()))
  89                 .request(request.method().asNetty())
  90                 .send(request.body().contents())
  91                 .uri(request.url());
  92     }
  93
  94     private ResponseReceiver<?> prepareBodyWithoutContents(HttpRequest request, HttpClient theClient) {
  95         return theClient
  96                 .request(request.method().asNetty())
  97                 .uri(request.url());
  98     }
  99
 100     private void logRequest(RequestDiagnosticContext context, HttpClientRequest httpClientRequest) {
 101         context.withSlf4jMdc(LOGGER.isDebugEnabled(), () -> {
 102             LOGGER.debug("Request: {} {} {}", httpClientRequest.method(), httpClientRequest.uri(),
 103                     httpClientRequest.requestHeaders());
 104             if (LOGGER.isTraceEnabled()) {
 105                 final String headers = Stream.ofAll(httpClientRequest.requestHeaders())
 106                         .map(entry -> entry.getKey() + "=" + entry.getValue())
 107                         .collect(Collectors.joining("\n"));
 108                 LOGGER.trace(headers);
 109             }
 110         });
 111     }
 112
 113     private void logResponse(RequestDiagnosticContext context, HttpClientResponse httpClientResponse) {
 114         context.withSlf4jMdc(LOGGER.isDebugEnabled(),
 115                 () -> LOGGER.debug("Response status: {}", httpClientResponse.status()));
 116     }
 117 }