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org.springframework.http.server.reactive.TomcatHttpHandlerAdapter Maven / Gradle / Ivy
/*
* Copyright 2002-2023 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.server.reactive;
import java.io.IOException;
import java.lang.reflect.Field;
import java.net.URISyntaxException;
import java.nio.ByteBuffer;
import jakarta.servlet.AsyncContext;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletRequestWrapper;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpServletResponseWrapper;
import org.apache.catalina.connector.CoyoteInputStream;
import org.apache.catalina.connector.CoyoteOutputStream;
import org.apache.catalina.connector.RequestFacade;
import org.apache.catalina.connector.ResponseFacade;
import org.apache.coyote.Request;
import org.apache.coyote.Response;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.util.Assert;
import org.springframework.util.MultiValueMap;
import org.springframework.util.ReflectionUtils;
/**
* {@link ServletHttpHandlerAdapter} extension that uses Tomcat APIs for reading
* from the request and writing to the response with {@link ByteBuffer}.
*
* @author Violeta Georgieva
* @author Brian Clozel
* @author Sam Brannen
* @author Juergen Hoeller
* @since 5.0
* @see org.springframework.web.server.adapter.AbstractReactiveWebInitializer
*/
public class TomcatHttpHandlerAdapter extends ServletHttpHandlerAdapter {
public TomcatHttpHandlerAdapter(HttpHandler httpHandler) {
super(httpHandler);
}
@Override
protected ServletServerHttpRequest createRequest(HttpServletRequest request, AsyncContext asyncContext)
throws IOException, URISyntaxException {
Assert.state(getServletPath() != null, "Servlet path is not initialized");
return new TomcatServerHttpRequest(
request, asyncContext, getServletPath(), getDataBufferFactory(), getBufferSize());
}
@Override
protected ServletServerHttpResponse createResponse(HttpServletResponse response,
AsyncContext asyncContext, ServletServerHttpRequest request) throws IOException {
return new TomcatServerHttpResponse(
response, asyncContext, getDataBufferFactory(), getBufferSize(), request);
}
private static final class TomcatServerHttpRequest extends ServletServerHttpRequest {
private static final Field COYOTE_REQUEST_FIELD;
private final int bufferSize;
private final DataBufferFactory factory;
static {
Field field = ReflectionUtils.findField(RequestFacade.class, "request");
Assert.state(field != null, "Incompatible Tomcat implementation");
ReflectionUtils.makeAccessible(field);
COYOTE_REQUEST_FIELD = field;
}
TomcatServerHttpRequest(HttpServletRequest request, AsyncContext context,
String servletPath, DataBufferFactory factory, int bufferSize)
throws IOException, URISyntaxException {
super(createTomcatHttpHeaders(request), request, context, servletPath, factory, bufferSize);
this.factory = factory;
this.bufferSize = bufferSize;
}
private static MultiValueMap createTomcatHttpHeaders(HttpServletRequest request) {
RequestFacade requestFacade = getRequestFacade(request);
org.apache.catalina.connector.Request connectorRequest = (org.apache.catalina.connector.Request)
ReflectionUtils.getField(COYOTE_REQUEST_FIELD, requestFacade);
Assert.state(connectorRequest != null, "No Tomcat connector request");
Request tomcatRequest = connectorRequest.getCoyoteRequest();
return new TomcatHeadersAdapter(tomcatRequest.getMimeHeaders());
}
private static RequestFacade getRequestFacade(HttpServletRequest request) {
if (request instanceof RequestFacade facade) {
return facade;
}
else if (request instanceof HttpServletRequestWrapper wrapper) {
HttpServletRequest wrappedRequest = (HttpServletRequest) wrapper.getRequest();
return getRequestFacade(wrappedRequest);
}
else {
throw new IllegalArgumentException("Cannot convert [" + request.getClass() +
"] to org.apache.catalina.connector.RequestFacade");
}
}
@Override
protected DataBuffer readFromInputStream() throws IOException {
if (getInputStream() instanceof CoyoteInputStream coyoteInputStream) {
DataBuffer dataBuffer = this.factory.allocateBuffer(this.bufferSize);
int read = -1;
try {
try (DataBuffer.ByteBufferIterator iterator = dataBuffer.writableByteBuffers()) {
Assert.state(iterator.hasNext(), "No ByteBuffer available");
ByteBuffer byteBuffer = iterator.next();
read = coyoteInputStream.read(byteBuffer);
}
logBytesRead(read);
if (read > 0) {
dataBuffer.writePosition(read);
return dataBuffer;
}
else if (read == -1) {
return EOF_BUFFER;
}
else {
return AbstractListenerReadPublisher.EMPTY_BUFFER;
}
}
finally {
if (read <= 0) {
DataBufferUtils.release(dataBuffer);
}
}
}
else {
// It's possible InputStream can be wrapped, preventing use of CoyoteInputStream
return super.readFromInputStream();
}
}
}
private static final class TomcatServerHttpResponse extends ServletServerHttpResponse {
private static final Field COYOTE_RESPONSE_FIELD;
static {
Field field = ReflectionUtils.findField(ResponseFacade.class, "response");
Assert.state(field != null, "Incompatible Tomcat implementation");
ReflectionUtils.makeAccessible(field);
COYOTE_RESPONSE_FIELD = field;
}
TomcatServerHttpResponse(HttpServletResponse response, AsyncContext context,
DataBufferFactory factory, int bufferSize, ServletServerHttpRequest request) throws IOException {
super(createTomcatHttpHeaders(response), response, context, factory, bufferSize, request);
}
private static HttpHeaders createTomcatHttpHeaders(HttpServletResponse response) {
ResponseFacade responseFacade = getResponseFacade(response);
org.apache.catalina.connector.Response connectorResponse = (org.apache.catalina.connector.Response)
ReflectionUtils.getField(COYOTE_RESPONSE_FIELD, responseFacade);
Assert.state(connectorResponse != null, "No Tomcat connector response");
Response tomcatResponse = connectorResponse.getCoyoteResponse();
TomcatHeadersAdapter headers = new TomcatHeadersAdapter(tomcatResponse.getMimeHeaders());
return new HttpHeaders(headers);
}
private static ResponseFacade getResponseFacade(HttpServletResponse response) {
if (response instanceof ResponseFacade facade) {
return facade;
}
else if (response instanceof HttpServletResponseWrapper wrapper) {
HttpServletResponse wrappedResponse = (HttpServletResponse) wrapper.getResponse();
return getResponseFacade(wrappedResponse);
}
else {
throw new IllegalArgumentException("Cannot convert [" + response.getClass() +
"] to org.apache.catalina.connector.ResponseFacade");
}
}
@Override
protected void applyHeaders() {
adaptHeaders(true);
}
@Override
protected int writeToOutputStream(DataBuffer dataBuffer) throws IOException {
if (getOutputStream() instanceof CoyoteOutputStream coyoteOutputStream) {
int len = 0;
try (DataBuffer.ByteBufferIterator iterator = dataBuffer.readableByteBuffers()) {
while (iterator.hasNext() && coyoteOutputStream.isReady()) {
ByteBuffer byteBuffer = iterator.next();
len += byteBuffer.remaining();
coyoteOutputStream.write(byteBuffer);
}
}
return len;
}
else {
return super.writeToOutputStream(dataBuffer);
}
}
}
}
