/*
* Copyright 2002-2016 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
*
* 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.
*/
package org.springframework.web.reactive.socket.client;
import java.net.URI;
import java.util.function.Consumer;
import io.netty.buffer.ByteBufAllocator;
import reactor.core.publisher.Mono;
import reactor.ipc.netty.http.client.HttpClient;
import reactor.ipc.netty.http.client.HttpClientOptions;
import reactor.ipc.netty.http.client.HttpClientResponse;
import org.springframework.core.io.buffer.NettyDataBufferFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.util.StringUtils;
import org.springframework.web.reactive.socket.HandshakeInfo;
import org.springframework.web.reactive.socket.WebSocketHandler;
import org.springframework.web.reactive.socket.WebSocketSession;
import org.springframework.web.reactive.socket.adapter.ReactorNettyWebSocketSession;
/**
* {@link WebSocketClient} implementation for use with Reactor Netty.
*
* @author Rossen Stoyanchev
* @since 5.0
*/
public class ReactorNettyWebSocketClient extends WebSocketClientSupport implements WebSocketClient {
private final HttpClient httpClient;
/**
* Default constructor.
*/
public ReactorNettyWebSocketClient() {
this(options -> {});
}
/**
* Constructor that accepts an {@link HttpClientOptions} consumer to supply
* to {@link HttpClient#create(Consumer)}.
*/
public ReactorNettyWebSocketClient(Consumer<? super HttpClientOptions> clientOptions) {
this.httpClient = HttpClient.create(clientOptions);
}
/**
* Return the configured {@link HttpClient}.
*/
public HttpClient getHttpClient() {
return this.httpClient;
}
@Override
public Mono<Void> execute(URI url, WebSocketHandler handler) {
return execute(url, new HttpHeaders(), handler);
}
@Override
public Mono<Void> execute(URI url, HttpHeaders headers, WebSocketHandler handler) {
String[] protocols = beforeHandshake(url, headers, handler);
return getHttpClient()
.ws(url.toString(),
nettyHeaders -> setNettyHeaders(headers, nettyHeaders),
StringUtils.arrayToCommaDelimitedString(protocols))
.flatMap(response -> {
HandshakeInfo info = afterHandshake(url, toHttpHeaders(response));
ByteBufAllocator allocator = response.channel().alloc();
NettyDataBufferFactory factory = new NettyDataBufferFactory(allocator);
return response.receiveWebsocket((in, out) -> {
WebSocketSession session = new ReactorNettyWebSocketSession(in, out, info, factory);
return handler.handle(session);
});
});
}
private void setNettyHeaders(HttpHeaders headers, io.netty.handler.codec.http.HttpHeaders nettyHeaders) {
headers.keySet().stream().forEach(key -> nettyHeaders.set(key, headers.get(key)));
}
private HttpHeaders toHttpHeaders(HttpClientResponse response) {
HttpHeaders headers = new HttpHeaders();
response.responseHeaders().forEach(entry -> {
String name = entry.getKey();
headers.put(name, response.responseHeaders().getAll(name));
});
return headers;
}
}