gerrit.onap Code Review - dcaegen2/services/sdk.git/blob

   1 /*
   2  * ============LICENSE_START====================================
   3  * DCAEGEN2-SERVICES-SDK
   4  * =========================================================
   5  * Copyright (C) 2019-2021 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.adapters.http;
  22
  23 import io.netty.handler.codec.http.HttpResponseStatus;
  24 import io.vavr.collection.HashSet;
  25 import io.vavr.collection.Stream;
  26 import io.vavr.control.Option;
  27 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.config.RetryConfig;
  28 import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31 import reactor.core.publisher.Mono;
  32 import reactor.netty.http.client.HttpClient;
  33 import reactor.netty.http.client.HttpClient.ResponseReceiver;
  34 import reactor.netty.http.client.HttpClientRequest;
  35 import reactor.netty.http.client.HttpClientResponse;
  36 import reactor.util.retry.Retry;
  37 import reactor.util.retry.RetryBackoffSpec;
  38
  39 import java.util.stream.Collectors;
  40
  41 /**
  42  * @since 1.1.4
  43  */
  44 public class RxHttpClient {
  45
  46     private static final Logger LOGGER = LoggerFactory.getLogger(RxHttpClient.class);
  47     private final HttpClient httpClient;
  48     private RetryConfig retryConfig;
  49
  50     RxHttpClient(HttpClient httpClient) {
  51         this.httpClient = httpClient;
  52     }
  53
  54     RxHttpClient(HttpClient httpClient, RetryConfig retryConfig) {
  55         this(httpClient);
  56         this.retryConfig = retryConfig;
  57     }
  58
  59     public Mono<HttpResponse> call(HttpRequest request) {
  60         Mono<HttpResponse> httpResponseMono = response(request);
  61         return Option.of(retryConfig)
  62                 .map(rc -> retryConfig(rc, request.diagnosticContext()))
  63                 .map(httpResponseMono::retryWhen)
  64                 .getOrElse(() -> httpResponseMono);
  65     }
  66
  67     ResponseReceiver<?> prepareRequest(HttpRequest request) {
  68         final HttpClient simpleClient = httpClient
  69                 .doOnRequest((req, conn) -> logRequest(request.diagnosticContext(), req))
  70                 .doOnResponse((rsp, conn) -> logResponse(request.diagnosticContext(), rsp))
  71                 .headers(hdrs -> request.headers().forEach(hdr -> hdrs.set(hdr._1, hdr._2)));
  72
  73         final HttpClient theClient = Option.of(request.timeout())
  74                 .map(simpleClient::responseTimeout)
  75                 .getOrElse(simpleClient);
  76
  77         return prepareBody(request, theClient);
  78     }
  79
  80     private Mono<HttpResponse> response(HttpRequest request) {
  81         return prepareRequest(request)
  82                 .responseSingle((resp, content) -> mapResponse(request.url(), resp.status(), content));
  83     }
  84
  85     private Mono<HttpResponse> mapResponse(String url, HttpResponseStatus status, reactor.netty.ByteBufMono content) {
  86         if (shouldRetry(status.code())) {
  87             return Mono.error(new RetryConfig.RetryableException());
  88         }
  89         return content.asByteArray()
  90                 .defaultIfEmpty(new byte[0])
  91                 .map(bytes -> new NettyHttpResponse(url, status, bytes));
  92     }
  93
  94     private boolean shouldRetry(int code) {
  95         return Option.of(retryConfig)
  96                 .map(RetryConfig::retryableHttpResponseCodes)
  97                 .getOrElse(HashSet::empty)
  98                 .contains(code);
  99     }
 100
 101     private ResponseReceiver<?> prepareBody(HttpRequest request, HttpClient theClient) {
 102         if (request.body() == null) {
 103             return prepareBodyWithoutContents(request, theClient);
 104         } else {
 105             return request.body().length() == null
 106                     ? prepareBodyChunked(request, theClient)
 107                     : prepareBodyUnchunked(request, theClient);
 108         }
 109     }
 110
 111     private ResponseReceiver<?> prepareBodyChunked(HttpRequest request, HttpClient theClient) {
 112         return theClient
 113                 .headers(hdrs -> hdrs.set(HttpHeaders.TRANSFER_ENCODING_TYPE, HttpHeaders.CHUNKED))
 114                 .request(request.method().asNetty())
 115                 .send(request.body().contents())
 116                 .uri(request.url());
 117     }
 118
 119     private ResponseReceiver<?> prepareBodyUnchunked(HttpRequest request, HttpClient theClient) {
 120         return theClient
 121                 .headers(hdrs -> hdrs.set(HttpHeaders.CONTENT_LENGTH, request.body().length().toString()))
 122                 .request(request.method().asNetty())
 123                 .send(request.body().contents())
 124                 .uri(request.url());
 125     }
 126
 127     private ResponseReceiver<?> prepareBodyWithoutContents(HttpRequest request, HttpClient theClient) {
 128         return theClient
 129                 .request(request.method().asNetty())
 130                 .uri(request.url());
 131     }
 132
 133     private void logRequest(RequestDiagnosticContext context, HttpClientRequest httpClientRequest) {
 134         context.withSlf4jMdc(LOGGER.isDebugEnabled(), () -> {
 135             LOGGER.debug("Request: {} {} {}", httpClientRequest.method(), httpClientRequest.uri(),
 136                     httpClientRequest.requestHeaders());
 137             if (LOGGER.isTraceEnabled()) {
 138                 final String headers = Stream.ofAll(httpClientRequest.requestHeaders())
 139                         .map(entry -> entry.getKey() + "=" + entry.getValue())
 140                         .collect(Collectors.joining("\n"));
 141                 LOGGER.trace(headers);
 142             }
 143         });
 144     }
 145
 146     private void logResponse(RequestDiagnosticContext context, HttpClientResponse httpClientResponse) {
 147         context.withSlf4jMdc(LOGGER.isDebugEnabled(),
 148                 () -> LOGGER.debug("Response status: {}", httpClientResponse.status()));
 149     }
 150
 151     private RetryBackoffSpec retryConfig(RetryConfig retryConfig, RequestDiagnosticContext context) {
 152         RetryBackoffSpec retry = Retry
 153                 .fixedDelay(retryConfig.retryCount(), retryConfig.retryInterval())
 154                 .doBeforeRetry(retrySignal -> context.withSlf4jMdc(
 155                         LOGGER.isTraceEnabled(), () -> LOGGER.trace("Retry: {}", retrySignal)))
 156                 .filter(ex -> isRetryable(retryConfig, ex));
 157
 158         return Option.of(retryConfig.onRetryExhaustedException())
 159                 .map(ex -> retry.onRetryExhaustedThrow((retryBackoffSpec, retrySignal) -> ex))
 160                 .getOrElse(retry);
 161     }
 162
 163     private boolean isRetryable(RetryConfig retryConfig, Throwable ex) {
 164         return retryConfig.retryableExceptions()
 165                 .toStream()
 166                 .exists(clazz -> clazz.isAssignableFrom(ex.getClass()));
 167     }
 168 }