org.springframework.http.client.reactive.ReactorClientHttpConnector Maven / Gradle / Ivy
/*
* Copyright 2002-2018 the original author or authors.
*
* 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
*
* https://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.
*/
package org.springframework.http.client.reactive;
import java.net.URI;
import java.util.function.Function;
import io.netty.buffer.ByteBufAllocator;
import reactor.core.publisher.Mono;
import reactor.netty.NettyInbound;
import reactor.netty.NettyOutbound;
import reactor.netty.http.client.HttpClient;
import reactor.netty.http.client.HttpClientRequest;
import reactor.netty.http.client.HttpClientResponse;
import reactor.netty.resources.ConnectionProvider;
import reactor.netty.resources.LoopResources;
import org.springframework.http.HttpMethod;
import org.springframework.util.Assert;
/**
* Reactor-Netty implementation of {@link ClientHttpConnector}.
*
* @author Brian Clozel
* @since 5.0
* @see reactor.netty.http.client.HttpClient
*/
public class ReactorClientHttpConnector implements ClientHttpConnector {
private final static Function defaultInitializer = client -> client.compress(true);
private final HttpClient httpClient;
/**
* Default constructor. Initializes {@link HttpClient} via:
*
* HttpClient.create().compress()
*
*/
public ReactorClientHttpConnector() {
this.httpClient = defaultInitializer.apply(HttpClient.create());
}
/**
* Constructor with externally managed Reactor Netty resources, including
* {@link LoopResources} for event loop threads, and {@link ConnectionProvider}
* for the connection pool.
* This constructor should be used only when you don't want the client
* to participate in the Reactor Netty global resources. By default the
* client participates in the Reactor Netty global resources held in
* {@link reactor.netty.http.HttpResources}, which is recommended since
* fixed, shared resources are favored for event loop concurrency. However,
* consider declaring a {@link ReactorResourceFactory} bean with
* {@code globalResources=true} in order to ensure the Reactor Netty global
* resources are shut down when the Spring ApplicationContext is closed.
* @param factory the resource factory to obtain the resources from
* @param mapper a mapper for further initialization of the created client
* @since 5.1
*/
public ReactorClientHttpConnector(ReactorResourceFactory factory, Function mapper) {
this.httpClient = defaultInitializer.andThen(mapper).apply(initHttpClient(factory));
}
private static HttpClient initHttpClient(ReactorResourceFactory resourceFactory) {
ConnectionProvider provider = resourceFactory.getConnectionProvider();
LoopResources resources = resourceFactory.getLoopResources();
Assert.notNull(provider, "No ConnectionProvider: is ReactorResourceFactory not initialized yet?");
Assert.notNull(resources, "No LoopResources: is ReactorResourceFactory not initialized yet?");
return HttpClient.create(provider).tcpConfiguration(tcpClient -> tcpClient.runOn(resources));
}
/**
* Constructor with a pre-configured {@code HttpClient} instance.
* @param httpClient the client to use
* @since 5.1
*/
public ReactorClientHttpConnector(HttpClient httpClient) {
Assert.notNull(httpClient, "HttpClient is required");
this.httpClient = httpClient;
}
@Override
public Mono connect(HttpMethod method, URI uri,
Function> requestCallback) {
if (!uri.isAbsolute()) {
return Mono.error(new IllegalArgumentException("URI is not absolute: " + uri));
}
return this.httpClient
.request(io.netty.handler.codec.http.HttpMethod.valueOf(method.name()))
.uri(uri.toString())
.send((request, outbound) -> requestCallback.apply(adaptRequest(method, uri, request, outbound)))
.responseConnection((res, con) -> Mono.just(adaptResponse(res, con.inbound(), con.outbound().alloc())))
.next();
}
private ReactorClientHttpRequest adaptRequest(HttpMethod method, URI uri, HttpClientRequest request,
NettyOutbound nettyOutbound) {
return new ReactorClientHttpRequest(method, uri, request, nettyOutbound);
}
private ClientHttpResponse adaptResponse(HttpClientResponse response, NettyInbound nettyInbound,
ByteBufAllocator allocator) {
return new ReactorClientHttpResponse(response, nettyInbound, allocator);
}
}