--- /dev/null
+/*-
+ * ========================LICENSE_START=================================
+ * O-RAN-SC
+ * %%
+ * Copyright (C) 2021 Nordix Foundation
+ * %%
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ========================LICENSE_END===================================
+ */
+
+package org.oran.dmaapadapter.clients;
+
+import io.netty.channel.ChannelOption;
+import io.netty.handler.ssl.SslContext;
+import io.netty.handler.timeout.ReadTimeoutHandler;
+import io.netty.handler.timeout.WriteTimeoutHandler;
+
+import java.lang.invoke.MethodHandles;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.oran.dmaapadapter.configuration.WebClientConfig.HttpProxyConfig;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.client.reactive.ReactorClientHttpConnector;
+import org.springframework.lang.Nullable;
+import org.springframework.web.reactive.function.client.ExchangeStrategies;
+import org.springframework.web.reactive.function.client.WebClient;
+import org.springframework.web.reactive.function.client.WebClient.RequestHeadersSpec;
+import org.springframework.web.reactive.function.client.WebClientResponseException;
+
+import reactor.core.publisher.Mono;
+import reactor.netty.http.client.HttpClient;
+import reactor.netty.transport.ProxyProvider;
+
+/**
+ * Generic reactive REST client.
+ */
+public class AsyncRestClient {
+
+ private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+ private WebClient webClient = null;
+ private final String baseUrl;
+ private static final AtomicInteger sequenceNumber = new AtomicInteger();
+ private final SslContext sslContext;
+ private final HttpProxyConfig httpProxyConfig;
+
+ public AsyncRestClient(String baseUrl, @Nullable SslContext sslContext, @Nullable HttpProxyConfig httpProxyConfig) {
+ this.baseUrl = baseUrl;
+ this.sslContext = sslContext;
+ this.httpProxyConfig = httpProxyConfig;
+ }
+
+ public Mono<ResponseEntity<String>> postForEntity(String uri, @Nullable String body) {
+ Object traceTag = createTraceTag();
+ logger.debug("{} POST uri = '{}{}''", traceTag, baseUrl, uri);
+ logger.trace("{} POST body: {}", traceTag, body);
+ Mono<String> bodyProducer = body != null ? Mono.just(body) : Mono.empty();
+ return getWebClient() //
+ .flatMap(client -> {
+ RequestHeadersSpec<?> request = client.post() //
+ .uri(uri) //
+ .contentType(MediaType.APPLICATION_JSON) //
+ .body(bodyProducer, String.class);
+ return retrieve(traceTag, request);
+ });
+ }
+
+ public Mono<String> post(String uri, @Nullable String body) {
+ return postForEntity(uri, body) //
+ .flatMap(this::toBody);
+ }
+
+ public Mono<String> postWithAuthHeader(String uri, String body, String username, String password) {
+ Object traceTag = createTraceTag();
+ logger.debug("{} POST (auth) uri = '{}{}''", traceTag, baseUrl, uri);
+ logger.trace("{} POST body: {}", traceTag, body);
+ return getWebClient() //
+ .flatMap(client -> {
+ RequestHeadersSpec<?> request = client.post() //
+ .uri(uri) //
+ .headers(headers -> headers.setBasicAuth(username, password)) //
+ .contentType(MediaType.APPLICATION_JSON) //
+ .bodyValue(body);
+ return retrieve(traceTag, request) //
+ .flatMap(this::toBody);
+ });
+ }
+
+ public Mono<ResponseEntity<String>> putForEntity(String uri, String body) {
+ Object traceTag = createTraceTag();
+ logger.debug("{} PUT uri = '{}{}''", traceTag, baseUrl, uri);
+ logger.trace("{} PUT body: {}", traceTag, body);
+ return getWebClient() //
+ .flatMap(client -> {
+ RequestHeadersSpec<?> request = client.put() //
+ .uri(uri) //
+ .contentType(MediaType.APPLICATION_JSON) //
+ .bodyValue(body);
+ return retrieve(traceTag, request);
+ });
+ }
+
+ public Mono<ResponseEntity<String>> putForEntity(String uri) {
+ Object traceTag = createTraceTag();
+ logger.debug("{} PUT uri = '{}{}''", traceTag, baseUrl, uri);
+ logger.trace("{} PUT body: <empty>", traceTag);
+ return getWebClient() //
+ .flatMap(client -> {
+ RequestHeadersSpec<?> request = client.put() //
+ .uri(uri);
+ return retrieve(traceTag, request);
+ });
+ }
+
+ public Mono<String> put(String uri, String body) {
+ return putForEntity(uri, body) //
+ .flatMap(this::toBody);
+ }
+
+ public Mono<ResponseEntity<String>> getForEntity(String uri) {
+ Object traceTag = createTraceTag();
+ logger.debug("{} GET uri = '{}{}''", traceTag, baseUrl, uri);
+ return getWebClient() //
+ .flatMap(client -> {
+ RequestHeadersSpec<?> request = client.get().uri(uri);
+ return retrieve(traceTag, request);
+ });
+ }
+
+ public Mono<String> get(String uri) {
+ return getForEntity(uri) //
+ .flatMap(this::toBody);
+ }
+
+ public Mono<ResponseEntity<String>> deleteForEntity(String uri) {
+ Object traceTag = createTraceTag();
+ logger.debug("{} DELETE uri = '{}{}''", traceTag, baseUrl, uri);
+ return getWebClient() //
+ .flatMap(client -> {
+ RequestHeadersSpec<?> request = client.delete().uri(uri);
+ return retrieve(traceTag, request);
+ });
+ }
+
+ public Mono<String> delete(String uri) {
+ return deleteForEntity(uri) //
+ .flatMap(this::toBody);
+ }
+
+ private Mono<ResponseEntity<String>> retrieve(Object traceTag, RequestHeadersSpec<?> request) {
+ final Class<String> clazz = String.class;
+ return request.retrieve() //
+ .toEntity(clazz) //
+ .doOnNext(entity -> logReceivedData(traceTag, entity)) //
+ .doOnError(throwable -> onHttpError(traceTag, throwable));
+ }
+
+ private void logReceivedData(Object traceTag, ResponseEntity<String> entity) {
+ logger.trace("{} Received: {} {}", traceTag, entity.getBody(), entity.getHeaders().getContentType());
+ }
+
+ private static Object createTraceTag() {
+ return sequenceNumber.incrementAndGet();
+ }
+
+ private void onHttpError(Object traceTag, Throwable t) {
+ if (t instanceof WebClientResponseException) {
+ WebClientResponseException exception = (WebClientResponseException) t;
+ logger.debug("{} HTTP error status = '{}', body '{}'", traceTag, exception.getStatusCode(),
+ exception.getResponseBodyAsString());
+ } else {
+ logger.debug("{} HTTP error {}", traceTag, t.getMessage());
+ }
+ }
+
+ private Mono<String> toBody(ResponseEntity<String> entity) {
+ if (entity.getBody() == null) {
+ return Mono.just("");
+ } else {
+ return Mono.just(entity.getBody());
+ }
+ }
+
+ private boolean isHttpProxyConfigured() {
+ return httpProxyConfig != null && httpProxyConfig.httpProxyPort() > 0
+ && !httpProxyConfig.httpProxyHost().isEmpty();
+ }
+
+ private HttpClient buildHttpClient() {
+ HttpClient httpClient = HttpClient.create() //
+ .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10_000) //
+ .doOnConnected(connection -> {
+ connection.addHandlerLast(new ReadTimeoutHandler(30));
+ connection.addHandlerLast(new WriteTimeoutHandler(30));
+ });
+
+ if (this.sslContext != null) {
+ httpClient = httpClient.secure(ssl -> ssl.sslContext(sslContext));
+ }
+
+ if (isHttpProxyConfigured()) {
+ httpClient = httpClient.proxy(proxy -> proxy.type(ProxyProvider.Proxy.HTTP)
+ .host(httpProxyConfig.httpProxyHost()).port(httpProxyConfig.httpProxyPort()));
+ }
+ return httpClient;
+ }
+
+ private WebClient buildWebClient(String baseUrl) {
+ final HttpClient httpClient = buildHttpClient();
+ ExchangeStrategies exchangeStrategies = ExchangeStrategies.builder() //
+ .codecs(configurer -> configurer.defaultCodecs().maxInMemorySize(-1)) //
+ .build();
+ return WebClient.builder() //
+ .clientConnector(new ReactorClientHttpConnector(httpClient)) //
+ .baseUrl(baseUrl) //
+ .exchangeStrategies(exchangeStrategies) //
+ .build();
+ }
+
+ private Mono<WebClient> getWebClient() {
+ if (this.webClient == null) {
+ this.webClient = buildWebClient(baseUrl);
+ }
+ return Mono.just(buildWebClient(baseUrl));
+ }
+
+}
Code Review / nonrtric.git / blobdiff