--- /dev/null
+/*-
+ * ========================LICENSE_START=================================
+ * O-RAN-SC
+ * %%
+ * Copyright (C) 2019 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.oransc.portal.nonrtric.controlpanel.util;
+
+import io.netty.channel.ChannelOption;
+import io.netty.handler.ssl.SslContext;
+import io.netty.handler.ssl.SslContextBuilder;
+import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
+import io.netty.handler.timeout.ReadTimeoutHandler;
+import io.netty.handler.timeout.WriteTimeoutHandler;
+
+import java.lang.invoke.MethodHandles;
+
+import javax.net.ssl.SSLException;
+
+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.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.tcp.TcpClient;
+
+/**
+ * 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;
+
+ public AsyncRestClient(String baseUrl) {
+ this.baseUrl = baseUrl;
+ }
+
+ public Mono<ResponseEntity<String>> putForEntity(String uri, String body) {
+ logger.debug("PUT uri = '{}{}''", baseUrl, uri);
+ return getWebClient() //
+ .flatMap(client -> {
+ RequestHeadersSpec<?> request = client.put() //
+ .uri(uri) //
+ .contentType(MediaType.APPLICATION_JSON) //
+ .bodyValue(body);
+ return retrieve(request);
+ });
+ }
+
+ public Mono<ResponseEntity<String>> putForEntity(String uri) {
+ logger.debug("PUT uri = '{}{}''", baseUrl, uri);
+ return getWebClient() //
+ .flatMap(client -> {
+ RequestHeadersSpec<?> request = client.put() //
+ .uri(uri);
+ return retrieve(request);
+ });
+ }
+
+ public Mono<String> put(String uri, String body) {
+ return putForEntity(uri, body) //
+ .flatMap(this::toBody);
+ }
+
+ public Mono<ResponseEntity<String>> getForEntity(String uri) {
+ logger.debug("GET uri = '{}{}''", baseUrl, uri);
+ return getWebClient() //
+ .flatMap(client -> {
+ RequestHeadersSpec<?> request = client.get().uri(uri);
+ return retrieve(request);
+ });
+ }
+
+ public Mono<String> get(String uri) {
+ return getForEntity(uri) //
+ .flatMap(this::toBody);
+ }
+
+ public Mono<ResponseEntity<String>> deleteForEntity(String uri) {
+ logger.debug("DELETE uri = '{}{}''", baseUrl, uri);
+ return getWebClient() //
+ .flatMap(client -> {
+ RequestHeadersSpec<?> request = client.delete().uri(uri);
+ return retrieve(request);
+ });
+ }
+
+ public Mono<String> delete(String uri) {
+ return deleteForEntity(uri) //
+ .flatMap(this::toBody);
+ }
+
+ private Mono<ResponseEntity<String>> retrieve(RequestHeadersSpec<?> request) {
+ return request.retrieve() //
+ .toEntity(String.class) //
+ .doOnError(this::onHttpError);
+ }
+
+ private void onHttpError(Throwable t) {
+ if (t instanceof WebClientResponseException) {
+ WebClientResponseException exception = (WebClientResponseException) t;
+ logger.debug("HTTP error status = '{}', body '{}'", exception.getStatusCode(),
+ exception.getResponseBodyAsString());
+ } else {
+ logger.debug("HTTP error: {}", t.getMessage());
+ }
+ }
+
+ private Mono<String> toBody(ResponseEntity<String> entity) {
+ if (entity.getBody() == null) {
+ return Mono.just("");
+ } else {
+ return Mono.just(entity.getBody());
+ }
+ }
+
+ private static SslContext createSslContext() throws SSLException {
+ return SslContextBuilder.forClient() //
+ .trustManager(InsecureTrustManagerFactory.INSTANCE) //
+ .build();
+ }
+
+ private static WebClient createWebClient(String baseUrl, SslContext sslContext) {
+ TcpClient tcpClient = TcpClient.create() //
+ .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10_000) //
+ .secure(c -> c.sslContext(sslContext)) //
+ .doOnConnected(connection -> {
+ connection.addHandler(new ReadTimeoutHandler(10));
+ connection.addHandler(new WriteTimeoutHandler(30));
+ });
+ HttpClient httpClient = HttpClient.from(tcpClient);
+ ReactorClientHttpConnector connector = new ReactorClientHttpConnector(httpClient);
+
+ return WebClient.builder() //
+ .clientConnector(connector) //
+ .baseUrl(baseUrl) //
+ .build();
+ }
+
+ private Mono<WebClient> getWebClient() {
+ if (this.webClient == null) {
+ try {
+ SslContext sslContext = createSslContext();
+ this.webClient = createWebClient(this.baseUrl, sslContext);
+ } catch (SSLException e) {
+ logger.error("Could not create WebClient {}", e.getMessage());
+ return Mono.error(e);
+ }
+ }
+ return Mono.just(this.webClient);
+ }
+
+}
Code Review / portal / nonrtric-controlpanel.git / blobdiff