X-Git-Url: https://gerrit.o-ran-sc.org/r/gitweb?a=blobdiff_plain;ds=sidebyside;f=dmaap-adaptor-java%2Fsrc%2Fmain%2Fjava%2Forg%2Foran%2Fdmaapadapter%2Fclients%2FAsyncRestClient.java;fp=dmaap-adaptor-java%2Fsrc%2Fmain%2Fjava%2Forg%2Foran%2Fdmaapadapter%2Fclients%2FAsyncRestClient.java;h=ec1541cfd35e5fe6e933445c1f26100501199f83;hb=18fddb8fc58d52d80e06ba87f43f028d30b68302;hp=0000000000000000000000000000000000000000;hpb=98ef4058086cfa3eddd6687def46c9410d727985;p=nonrtric.git

diff --git a/dmaap-adaptor-java/src/main/java/org/oran/dmaapadapter/clients/AsyncRestClient.java b/dmaap-adaptor-java/src/main/java/org/oran/dmaapadapter/clients/AsyncRestClient.java
new file mode 100644
index 00000000..ec1541cf
--- /dev/null
+++ b/dmaap-adaptor-java/src/main/java/org/oran/dmaapadapter/clients/AsyncRestClient.java
@@ -0,0 +1,239 @@
+/*-
+ * ========================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));
+    }
+
+}