gerrit.onap Code Review - ccsdk/oran.git/blob

   1 /*-
   2  * ========================LICENSE_START=================================
   3  * ONAP : ccsdk oran
   4  * ======================================================================
   5  * Copyright (C) 2019-2022 Nordix Foundation. 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.ccsdk.oran.a1policymanagementservice.clients;
  22
  23 import io.netty.channel.ChannelOption;
  24 import io.netty.handler.ssl.SslContext;
  25 import io.netty.handler.timeout.ReadTimeoutHandler;
  26 import io.netty.handler.timeout.WriteTimeoutHandler;
  27
  28 import java.lang.invoke.MethodHandles;
  29 import java.util.concurrent.atomic.AtomicInteger;
  30
  31 import org.onap.ccsdk.oran.a1policymanagementservice.configuration.WebClientConfig.HttpProxyConfig;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34 import org.springframework.http.MediaType;
  35 import org.springframework.http.ResponseEntity;
  36 import org.springframework.http.client.reactive.ReactorClientHttpConnector;
  37 import org.springframework.lang.Nullable;
  38 import org.springframework.web.reactive.function.client.ExchangeFilterFunction;
  39 import org.springframework.web.reactive.function.client.ExchangeStrategies;
  40 import org.springframework.web.reactive.function.client.WebClient;
  41 import org.springframework.web.reactive.function.client.WebClient.RequestHeadersSpec;
  42 import org.springframework.web.reactive.function.client.WebClientResponseException;
  43
  44 import reactor.core.publisher.Mono;
  45 import reactor.netty.http.client.HttpClient;
  46 import reactor.netty.transport.ProxyProvider;
  47
  48 /**
  49  * Generic reactive REST client.
  50  */
  51 public class AsyncRestClient {
  52
  53     private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  54     private WebClient webClient = null;
  55     private final String baseUrl;
  56     private static final AtomicInteger sequenceNumber = new AtomicInteger();
  57     private final SslContext sslContext;
  58     private final HttpProxyConfig httpProxyConfig;
  59     private final SecurityContext securityContext;
  60
  61     public AsyncRestClient(String baseUrl, @Nullable SslContext sslContext, @Nullable HttpProxyConfig httpProxyConfig,
  62             SecurityContext securityContext) {
  63         this.baseUrl = baseUrl;
  64         this.sslContext = sslContext;
  65         this.httpProxyConfig = httpProxyConfig;
  66         this.securityContext = securityContext;
  67     }
  68
  69     public Mono<ResponseEntity<String>> postForEntity(String uri, @Nullable String body) {
  70         Mono<String> bodyProducer = body != null ? Mono.just(body) : Mono.empty();
  71
  72         RequestHeadersSpec<?> request = getWebClient() //
  73                 .post() //
  74                 .uri(uri) //
  75                 .contentType(MediaType.APPLICATION_JSON) //
  76                 .body(bodyProducer, String.class);
  77         return retrieve(request);
  78     }
  79
  80     public Mono<String> post(String uri, @Nullable String body) {
  81         return postForEntity(uri, body) //
  82                 .map(this::toBody);
  83     }
  84
  85     public Mono<String> postWithAuthHeader(String uri, String body, String username, String password) {
  86         RequestHeadersSpec<?> request = getWebClient() //
  87                 .post() //
  88                 .uri(uri) //
  89                 .headers(headers -> headers.setBasicAuth(username, password)) //
  90                 .contentType(MediaType.APPLICATION_JSON) //
  91                 .bodyValue(body);
  92         return retrieve(request) //
  93                 .map(this::toBody);
  94     }
  95
  96     public Mono<ResponseEntity<String>> putForEntity(String uri, String body) {
  97         RequestHeadersSpec<?> request = getWebClient() //
  98                 .put() //
  99                 .uri(uri) //
 100                 .contentType(MediaType.APPLICATION_JSON) //
 101                 .bodyValue(body);
 102         return retrieve(request);
 103     }
 104
 105     public Mono<ResponseEntity<String>> putForEntity(String uri) {
 106         RequestHeadersSpec<?> request = getWebClient() //
 107                 .put() //
 108                 .uri(uri);
 109         return retrieve(request);
 110     }
 111
 112     public Mono<String> put(String uri, String body) {
 113         return putForEntity(uri, body) //
 114                 .map(this::toBody);
 115     }
 116
 117     public Mono<ResponseEntity<String>> getForEntity(String uri) {
 118         RequestHeadersSpec<?> request = getWebClient().get().uri(uri);
 119         return retrieve(request);
 120     }
 121
 122     public Mono<String> get(String uri) {
 123         return getForEntity(uri) //
 124                 .map(this::toBody);
 125     }
 126
 127     public Mono<ResponseEntity<String>> deleteForEntity(String uri) {
 128         RequestHeadersSpec<?> request = getWebClient().delete().uri(uri);
 129         return retrieve(request);
 130     }
 131
 132     public Mono<String> delete(String uri) {
 133         return deleteForEntity(uri) //
 134                 .map(this::toBody);
 135     }
 136
 137     private Mono<ResponseEntity<String>> retrieve(RequestHeadersSpec<?> request) {
 138         if (securityContext.isConfigured()) {
 139             request.headers(h -> h.setBearerAuth(securityContext.getBearerAuthToken()));
 140         }
 141         return request.retrieve() //
 142                 .toEntity(String.class) //
 143                 .doOnError(this::onError);
 144
 145     }
 146
 147     private void onError(Throwable t) {
 148         if (t instanceof WebClientResponseException) {
 149             WebClientResponseException e = (WebClientResponseException) t;
 150             logger.debug("Response error: {}", e.getResponseBodyAsString());
 151         }
 152     }
 153
 154     private static Object createTraceTag() {
 155         return sequenceNumber.incrementAndGet();
 156     }
 157
 158     private String toBody(ResponseEntity<String> entity) {
 159         if (entity.getBody() == null) {
 160             return "";
 161         } else {
 162             return entity.getBody();
 163         }
 164     }
 165
 166     private boolean isHttpProxyConfigured() {
 167         return httpProxyConfig != null && httpProxyConfig.getHttpProxyPort() > 0
 168                 && !httpProxyConfig.getHttpProxyHost().isEmpty();
 169     }
 170
 171     private HttpClient buildHttpClient() {
 172         HttpClient httpClient = HttpClient.create() //
 173                 .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10_000) //
 174                 .doOnConnected(connection -> {
 175                     connection.addHandlerLast(new ReadTimeoutHandler(30));
 176                     connection.addHandlerLast(new WriteTimeoutHandler(30));
 177                 });
 178
 179         if (this.sslContext != null) {
 180             httpClient = httpClient.secure(ssl -> ssl.sslContext(sslContext));
 181         }
 182
 183         if (isHttpProxyConfigured()) {
 184             httpClient = httpClient.proxy(proxy -> proxy.type(ProxyProvider.Proxy.HTTP)
 185                     .host(httpProxyConfig.getHttpProxyHost()).port(httpProxyConfig.getHttpProxyPort()));
 186         }
 187         return httpClient;
 188     }
 189
 190     public WebClient buildWebClient(String baseUrl) {
 191         Object traceTag = createTraceTag();
 192
 193         final HttpClient httpClient = buildHttpClient();
 194         ExchangeStrategies exchangeStrategies = ExchangeStrategies.builder() //
 195                 .codecs(configurer -> configurer.defaultCodecs().maxInMemorySize(-1)) //
 196                 .build();
 197
 198         ExchangeFilterFunction reqLogger = ExchangeFilterFunction.ofRequestProcessor(req -> {
 199             logger.debug("{} {} uri = '{}''", traceTag, req.method(), req.url());
 200             return Mono.just(req);
 201         });
 202
 203         ExchangeFilterFunction respLogger = ExchangeFilterFunction.ofResponseProcessor(resp -> {
 204             logger.debug("{} resp: {}", traceTag, resp.statusCode());
 205             return Mono.just(resp);
 206         });
 207
 208         return WebClient.builder() //
 209                 .clientConnector(new ReactorClientHttpConnector(httpClient)) //
 210                 .baseUrl(baseUrl) //
 211                 .exchangeStrategies(exchangeStrategies) //
 212                 .filter(reqLogger) //
 213                 .filter(respLogger) //
 214                 .build();
 215     }
 216
 217     private WebClient getWebClient() {
 218         if (this.webClient == null) {
 219             this.webClient = buildWebClient(baseUrl);
 220         }
 221         return this.webClient;
 222     }
 223 }