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/*-
* ========================LICENSE_START=================================
* ONAP : ccsdk oran
* ======================================================================
* Copyright (C) 2019-2020 Nordix Foundation. All rights reserved.
* ======================================================================
* 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.onap.ccsdk.oran.a1policymanagementservice.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.onap.ccsdk.oran.a1policymanagementservice.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;
/**
* 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(httpProxyConfig.httpProxyType()) //
.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));
}
}
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