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

   1 /*-
   2  * ========================LICENSE_START=================================
   3  * ONAP : ccsdk oran
   4  * ======================================================================
   5  * Copyright (C) 2019-2020 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.ExchangeStrategies;
  39 import org.springframework.web.reactive.function.client.WebClient;
  40 import org.springframework.web.reactive.function.client.WebClient.RequestHeadersSpec;
  41 import org.springframework.web.reactive.function.client.WebClientResponseException;
  42
  43 import reactor.core.publisher.Mono;
  44 import reactor.netty.http.client.HttpClient;
  45
  46 /**
  47  * Generic reactive REST client.
  48  */
  49 public class AsyncRestClient {
  50
  51     private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  52     private WebClient webClient = null;
  53     private final String baseUrl;
  54     private static final AtomicInteger sequenceNumber = new AtomicInteger();
  55     private final SslContext sslContext;
  56     private final HttpProxyConfig httpProxyConfig;
  57
  58     public AsyncRestClient(String baseUrl, @Nullable SslContext sslContext, @Nullable HttpProxyConfig httpProxyConfig) {
  59         this.baseUrl = baseUrl;
  60         this.sslContext = sslContext;
  61         this.httpProxyConfig = httpProxyConfig;
  62     }
  63
  64     public Mono<ResponseEntity<String>> postForEntity(String uri, @Nullable String body) {
  65         Object traceTag = createTraceTag();
  66         logger.debug("{} POST uri = '{}{}''", traceTag, baseUrl, uri);
  67         logger.trace("{} POST body: {}", traceTag, body);
  68         Mono<String> bodyProducer = body != null ? Mono.just(body) : Mono.empty();
  69         return getWebClient() //
  70                 .flatMap(client -> {
  71                     RequestHeadersSpec<?> request = client.post() //
  72                             .uri(uri) //
  73                             .contentType(MediaType.APPLICATION_JSON) //
  74                             .body(bodyProducer, String.class);
  75                     return retrieve(traceTag, request);
  76                 });
  77     }
  78
  79     public Mono<String> post(String uri, @Nullable String body) {
  80         return postForEntity(uri, body) //
  81                 .flatMap(this::toBody);
  82     }
  83
  84     public Mono<String> postWithAuthHeader(String uri, String body, String username, String password) {
  85         Object traceTag = createTraceTag();
  86         logger.debug("{} POST (auth) uri = '{}{}''", traceTag, baseUrl, uri);
  87         logger.trace("{} POST body: {}", traceTag, body);
  88         return getWebClient() //
  89                 .flatMap(client -> {
  90                     RequestHeadersSpec<?> request = client.post() //
  91                             .uri(uri) //
  92                             .headers(headers -> headers.setBasicAuth(username, password)) //
  93                             .contentType(MediaType.APPLICATION_JSON) //
  94                             .bodyValue(body);
  95                     return retrieve(traceTag, request) //
  96                             .flatMap(this::toBody);
  97                 });
  98     }
  99
 100     public Mono<ResponseEntity<String>> putForEntity(String uri, String body) {
 101         Object traceTag = createTraceTag();
 102         logger.debug("{} PUT uri = '{}{}''", traceTag, baseUrl, uri);
 103         logger.trace("{} PUT body: {}", traceTag, body);
 104         return getWebClient() //
 105                 .flatMap(client -> {
 106                     RequestHeadersSpec<?> request = client.put() //
 107                             .uri(uri) //
 108                             .contentType(MediaType.APPLICATION_JSON) //
 109                             .bodyValue(body);
 110                     return retrieve(traceTag, request);
 111                 });
 112     }
 113
 114     public Mono<ResponseEntity<String>> putForEntity(String uri) {
 115         Object traceTag = createTraceTag();
 116         logger.debug("{} PUT uri = '{}{}''", traceTag, baseUrl, uri);
 117         logger.trace("{} PUT body: <empty>", traceTag);
 118         return getWebClient() //
 119                 .flatMap(client -> {
 120                     RequestHeadersSpec<?> request = client.put() //
 121                             .uri(uri);
 122                     return retrieve(traceTag, request);
 123                 });
 124     }
 125
 126     public Mono<String> put(String uri, String body) {
 127         return putForEntity(uri, body) //
 128                 .flatMap(this::toBody);
 129     }
 130
 131     public Mono<ResponseEntity<String>> getForEntity(String uri) {
 132         Object traceTag = createTraceTag();
 133         logger.debug("{} GET uri = '{}{}''", traceTag, baseUrl, uri);
 134         return getWebClient() //
 135                 .flatMap(client -> {
 136                     RequestHeadersSpec<?> request = client.get().uri(uri);
 137                     return retrieve(traceTag, request);
 138                 });
 139     }
 140
 141     public Mono<String> get(String uri) {
 142         return getForEntity(uri) //
 143                 .flatMap(this::toBody);
 144     }
 145
 146     public Mono<ResponseEntity<String>> deleteForEntity(String uri) {
 147         Object traceTag = createTraceTag();
 148         logger.debug("{} DELETE uri = '{}{}''", traceTag, baseUrl, uri);
 149         return getWebClient() //
 150                 .flatMap(client -> {
 151                     RequestHeadersSpec<?> request = client.delete().uri(uri);
 152                     return retrieve(traceTag, request);
 153                 });
 154     }
 155
 156     public Mono<String> delete(String uri) {
 157         return deleteForEntity(uri) //
 158                 .flatMap(this::toBody);
 159     }
 160
 161     private Mono<ResponseEntity<String>> retrieve(Object traceTag, RequestHeadersSpec<?> request) {
 162         final Class<String> clazz = String.class;
 163         return request.retrieve() //
 164                 .toEntity(clazz) //
 165                 .doOnNext(entity -> logReceivedData(traceTag, entity)) //
 166                 .doOnError(throwable -> onHttpError(traceTag, throwable));
 167     }
 168
 169     private void logReceivedData(Object traceTag, ResponseEntity<String> entity) {
 170         logger.trace("{} Received: {} {}", traceTag, entity.getBody(), entity.getHeaders().getContentType());
 171     }
 172
 173     private static Object createTraceTag() {
 174         return sequenceNumber.incrementAndGet();
 175     }
 176
 177     private void onHttpError(Object traceTag, Throwable t) {
 178         if (t instanceof WebClientResponseException) {
 179             WebClientResponseException exception = (WebClientResponseException) t;
 180             logger.debug("{} HTTP error status = '{}', body '{}'", traceTag, exception.getStatusCode(),
 181                     exception.getResponseBodyAsString());
 182         } else {
 183             logger.debug("{} HTTP error {}", traceTag, t.getMessage());
 184         }
 185     }
 186
 187     private Mono<String> toBody(ResponseEntity<String> entity) {
 188         if (entity.getBody() == null) {
 189             return Mono.just("");
 190         } else {
 191             return Mono.just(entity.getBody());
 192         }
 193     }
 194
 195     private boolean isHttpProxyConfigured() {
 196         return httpProxyConfig != null && httpProxyConfig.httpProxyPort() > 0
 197                 && !httpProxyConfig.httpProxyHost().isEmpty();
 198     }
 199
 200     private HttpClient buildHttpClient() {
 201         HttpClient httpClient = HttpClient.create() //
 202                 .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10_000) //
 203                 .doOnConnected(connection -> {
 204                     connection.addHandlerLast(new ReadTimeoutHandler(30));
 205                     connection.addHandlerLast(new WriteTimeoutHandler(30));
 206                 });
 207
 208         if (this.sslContext != null) {
 209             httpClient = httpClient.secure(ssl -> ssl.sslContext(sslContext));
 210         }
 211
 212         if (isHttpProxyConfigured()) {
 213             httpClient = httpClient.proxy(proxy -> proxy.type(httpProxyConfig.httpProxyType()) //
 214                     .host(httpProxyConfig.httpProxyHost()) //
 215                     .port(httpProxyConfig.httpProxyPort()));
 216         }
 217         return httpClient;
 218     }
 219
 220     private WebClient buildWebClient(String baseUrl) {
 221         final HttpClient httpClient = buildHttpClient();
 222         ExchangeStrategies exchangeStrategies = ExchangeStrategies.builder() //
 223                 .codecs(configurer -> configurer.defaultCodecs().maxInMemorySize(-1)) //
 224                 .build();
 225         return WebClient.builder() //
 226                 .clientConnector(new ReactorClientHttpConnector(httpClient)) //
 227                 .baseUrl(baseUrl) //
 228                 .exchangeStrategies(exchangeStrategies) //
 229                 .build();
 230     }
 231
 232     private Mono<WebClient> getWebClient() {
 233         if (this.webClient == null) {
 234             this.webClient = buildWebClient(baseUrl);
 235         }
 236         return Mono.just(buildWebClient(baseUrl));
 237     }
 238
 239 }