spring UndertowRequestUpgradeStrategy 源码
spring UndertowRequestUpgradeStrategy 代码
文件路径:/spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/upgrade/UndertowRequestUpgradeStrategy.java
/*
* Copyright 2002-2022 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.web.reactive.socket.server.upgrade;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.function.Supplier;
import io.undertow.server.HttpServerExchange;
import io.undertow.websockets.WebSocketConnectionCallback;
import io.undertow.websockets.WebSocketProtocolHandshakeHandler;
import io.undertow.websockets.core.WebSocketChannel;
import io.undertow.websockets.core.protocol.Handshake;
import io.undertow.websockets.core.protocol.version13.Hybi13Handshake;
import io.undertow.websockets.spi.WebSocketHttpExchange;
import reactor.core.publisher.Mono;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
import org.springframework.lang.Nullable;
import org.springframework.web.reactive.socket.HandshakeInfo;
import org.springframework.web.reactive.socket.WebSocketHandler;
import org.springframework.web.reactive.socket.adapter.ContextWebSocketHandler;
import org.springframework.web.reactive.socket.adapter.UndertowWebSocketHandlerAdapter;
import org.springframework.web.reactive.socket.adapter.UndertowWebSocketSession;
import org.springframework.web.reactive.socket.server.RequestUpgradeStrategy;
import org.springframework.web.server.ServerWebExchange;
/**
* A {@link RequestUpgradeStrategy} for use with Undertow.
*
* @author Violeta Georgieva
* @author Rossen Stoyanchev
* @author Brian Clozel
* @since 5.0
*/
public class UndertowRequestUpgradeStrategy implements RequestUpgradeStrategy {
@Override
public Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler handler,
@Nullable String subProtocol, Supplier<HandshakeInfo> handshakeInfoFactory) {
HttpServerExchange httpExchange = ServerHttpRequestDecorator.getNativeRequest(exchange.getRequest());
Set<String> protocols = (subProtocol != null ? Collections.singleton(subProtocol) : Collections.emptySet());
Hybi13Handshake handshake = new Hybi13Handshake(protocols, false);
List<Handshake> handshakes = Collections.singletonList(handshake);
HandshakeInfo handshakeInfo = handshakeInfoFactory.get();
DataBufferFactory bufferFactory = exchange.getResponse().bufferFactory();
// Trigger WebFlux preCommit actions and upgrade
return exchange.getResponse().setComplete()
.then(Mono.deferContextual(contextView -> {
DefaultCallback callback = new DefaultCallback(
handshakeInfo,
ContextWebSocketHandler.decorate(handler, contextView),
bufferFactory);
try {
new WebSocketProtocolHandshakeHandler(handshakes, callback).handleRequest(httpExchange);
}
catch (Exception ex) {
return Mono.error(ex);
}
return Mono.empty();
}));
}
private static class DefaultCallback implements WebSocketConnectionCallback {
private final HandshakeInfo handshakeInfo;
private final WebSocketHandler handler;
private final DataBufferFactory bufferFactory;
public DefaultCallback(HandshakeInfo handshakeInfo, WebSocketHandler handler, DataBufferFactory bufferFactory) {
this.handshakeInfo = handshakeInfo;
this.handler = handler;
this.bufferFactory = bufferFactory;
}
@Override
public void onConnect(WebSocketHttpExchange exchange, WebSocketChannel channel) {
UndertowWebSocketSession session = createSession(channel);
UndertowWebSocketHandlerAdapter adapter = new UndertowWebSocketHandlerAdapter(session);
channel.getReceiveSetter().set(adapter);
channel.resumeReceives();
this.handler.handle(session)
.checkpoint(exchange.getRequestURI() + " [UndertowRequestUpgradeStrategy]")
.subscribe(session);
}
private UndertowWebSocketSession createSession(WebSocketChannel channel) {
return new UndertowWebSocketSession(channel, this.handshakeInfo, this.bufferFactory);
}
}
}
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