/*
 * 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
 *
 *      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.
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package org.springframework.http.server.reactive;

import java.io.IOException;
import java.net.URISyntaxException;

import io.undertow.server.HttpServerExchange;
import org.apache.commons.logging.Log;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;

import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DefaultDataBufferFactory;
import org.springframework.http.HttpLogging;
import org.springframework.http.HttpMethod;
import org.springframework.util.Assert;

Adapt HttpHandler to the Undertow HttpHandler.
Author:Marek Hawrylczak, Rossen Stoyanchev, Arjen Poutsma
Since:5.0
/** * Adapt {@link HttpHandler} to the Undertow {@link io.undertow.server.HttpHandler}. * * @author Marek Hawrylczak * @author Rossen Stoyanchev * @author Arjen Poutsma * @since 5.0 */
public class UndertowHttpHandlerAdapter implements io.undertow.server.HttpHandler { private static final Log logger = HttpLogging.forLogName(UndertowHttpHandlerAdapter.class); private final HttpHandler httpHandler; private DataBufferFactory bufferFactory = new DefaultDataBufferFactory(false); public UndertowHttpHandlerAdapter(HttpHandler httpHandler) { Assert.notNull(httpHandler, "HttpHandler must not be null"); this.httpHandler = httpHandler; } public void setDataBufferFactory(DataBufferFactory bufferFactory) { Assert.notNull(bufferFactory, "DataBufferFactory must not be null"); this.bufferFactory = bufferFactory; } public DataBufferFactory getDataBufferFactory() { return this.bufferFactory; } @Override public void handleRequest(HttpServerExchange exchange) { UndertowServerHttpRequest request = null; try { request = new UndertowServerHttpRequest(exchange, getDataBufferFactory()); } catch (URISyntaxException ex) { if (logger.isWarnEnabled()) { logger.debug("Failed to get request URI: " + ex.getMessage()); } exchange.setStatusCode(400); return; } ServerHttpResponse response = new UndertowServerHttpResponse(exchange, getDataBufferFactory(), request); if (request.getMethod() == HttpMethod.HEAD) { response = new HttpHeadResponseDecorator(response); } HandlerResultSubscriber resultSubscriber = new HandlerResultSubscriber(exchange, request); this.httpHandler.handle(request, response).subscribe(resultSubscriber); } private class HandlerResultSubscriber implements Subscriber<Void> { private final HttpServerExchange exchange; private final String logPrefix; public HandlerResultSubscriber(HttpServerExchange exchange, UndertowServerHttpRequest request) { this.exchange = exchange; this.logPrefix = request.getLogPrefix(); } @Override public void onSubscribe(Subscription subscription) { subscription.request(Long.MAX_VALUE); } @Override public void onNext(Void aVoid) { // no-op } @Override public void onError(Throwable ex) { logger.trace(this.logPrefix + "Failed to complete: " + ex.getMessage()); if (this.exchange.isResponseStarted()) { try { logger.debug(this.logPrefix + "Closing connection"); this.exchange.getConnection().close(); } catch (IOException ex2) { // ignore } } else { logger.debug(this.logPrefix + "Setting HttpServerExchange status to 500 Server Error"); this.exchange.setStatusCode(500); this.exchange.endExchange(); } } @Override public void onComplete() { logger.trace(this.logPrefix + "Handling completed"); this.exchange.endExchange(); } } }