ServerH2StreamHandler.java
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
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package org.apache.hc.core5.http2.impl.nio;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.hc.core5.http.EntityDetails;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.HttpVersion;
import org.apache.hc.core5.http.Method;
import org.apache.hc.core5.http.ProtocolException;
import org.apache.hc.core5.http.impl.BasicHttpConnectionMetrics;
import org.apache.hc.core5.http.impl.IncomingEntityDetails;
import org.apache.hc.core5.http.impl.ServerSupport;
import org.apache.hc.core5.http.impl.nio.MessageState;
import org.apache.hc.core5.http.nio.AsyncPushConsumer;
import org.apache.hc.core5.http.nio.AsyncPushProducer;
import org.apache.hc.core5.http.nio.AsyncResponseProducer;
import org.apache.hc.core5.http.nio.AsyncServerExchangeHandler;
import org.apache.hc.core5.http.nio.DataStreamChannel;
import org.apache.hc.core5.http.nio.HandlerFactory;
import org.apache.hc.core5.http.nio.ResponseChannel;
import org.apache.hc.core5.http.nio.support.BasicResponseProducer;
import org.apache.hc.core5.http.nio.support.ImmediateResponseExchangeHandler;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.http.protocol.HttpCoreContext;
import org.apache.hc.core5.http.protocol.HttpProcessor;
import org.apache.hc.core5.http2.H2ConnectionException;
import org.apache.hc.core5.http2.H2Error;
import org.apache.hc.core5.http2.H2StreamResetException;
import org.apache.hc.core5.http2.impl.DefaultH2RequestConverter;
import org.apache.hc.core5.http2.impl.DefaultH2ResponseConverter;
import org.apache.hc.core5.util.Asserts;
class ServerH2StreamHandler implements H2StreamHandler {
private final H2StreamChannel outputChannel;
private final DataStreamChannel dataChannel;
private final ResponseChannel responseChannel;
private final HttpProcessor httpProcessor;
private final BasicHttpConnectionMetrics connMetrics;
private final HandlerFactory<AsyncServerExchangeHandler> exchangeHandlerFactory;
private final HttpCoreContext context;
private final AtomicBoolean responseCommitted;
private final AtomicBoolean failed;
private final AtomicBoolean done;
private volatile AsyncServerExchangeHandler exchangeHandler;
private volatile HttpRequest receivedRequest;
private volatile MessageState requestState;
private volatile MessageState responseState;
ServerH2StreamHandler(
final H2StreamChannel outputChannel,
final HttpProcessor httpProcessor,
final BasicHttpConnectionMetrics connMetrics,
final HandlerFactory<AsyncServerExchangeHandler> exchangeHandlerFactory,
final HttpCoreContext context) {
this.outputChannel = outputChannel;
this.dataChannel = new DataStreamChannel() {
@Override
public void requestOutput() {
outputChannel.requestOutput();
}
@Override
public int write(final ByteBuffer src) throws IOException {
return outputChannel.write(src);
}
@Override
public void endStream(final List<? extends Header> trailers) throws IOException {
outputChannel.endStream(trailers);
responseState = MessageState.COMPLETE;
}
@Override
public void endStream() throws IOException {
outputChannel.endStream();
responseState = MessageState.COMPLETE;
}
};
this.responseChannel = new ResponseChannel() {
@Override
public void sendInformation(final HttpResponse response, final HttpContext httpContext) throws HttpException, IOException {
commitInformation(response);
}
@Override
public void sendResponse(
final HttpResponse response, final EntityDetails responseEntityDetails, final HttpContext httpContext) throws HttpException, IOException {
commitResponse(response, responseEntityDetails);
}
@Override
public void pushPromise(
final HttpRequest promise, final AsyncPushProducer pushProducer, final HttpContext httpContext) throws HttpException, IOException {
commitPromise(promise, pushProducer);
}
};
this.httpProcessor = httpProcessor;
this.connMetrics = connMetrics;
this.exchangeHandlerFactory = exchangeHandlerFactory;
this.context = context;
this.responseCommitted = new AtomicBoolean();
this.failed = new AtomicBoolean();
this.done = new AtomicBoolean();
this.requestState = MessageState.HEADERS;
this.responseState = MessageState.IDLE;
}
@Override
public HandlerFactory<AsyncPushConsumer> getPushHandlerFactory() {
return null;
}
private void commitInformation(final HttpResponse response) throws IOException, HttpException {
if (responseCommitted.get()) {
throw new H2ConnectionException(H2Error.INTERNAL_ERROR, "Response already committed");
}
final int status = response.getCode();
if (status < HttpStatus.SC_INFORMATIONAL || status >= HttpStatus.SC_SUCCESS) {
throw new HttpException("Invalid intermediate response: " + status);
}
final List<Header> responseHeaders = DefaultH2ResponseConverter.INSTANCE.convert(response);
outputChannel.submit(responseHeaders, false);
}
private void commitResponse(
final HttpResponse response,
final EntityDetails responseEntityDetails) throws HttpException, IOException {
if (responseCommitted.compareAndSet(false, true)) {
final int status = response.getCode();
if (status < HttpStatus.SC_SUCCESS) {
throw new HttpException("Invalid response: " + status);
}
context.setResponse(response);
httpProcessor.process(response, responseEntityDetails, context);
final List<Header> responseHeaders = DefaultH2ResponseConverter.INSTANCE.convert(response);
final boolean endStream = responseEntityDetails == null ||
(receivedRequest != null && Method.HEAD.isSame(receivedRequest.getMethod()));
outputChannel.submit(responseHeaders, endStream);
connMetrics.incrementResponseCount();
if (responseEntityDetails == null) {
responseState = MessageState.COMPLETE;
} else {
responseState = MessageState.BODY;
exchangeHandler.produce(outputChannel);
}
} else {
throw new H2ConnectionException(H2Error.INTERNAL_ERROR, "Response already committed");
}
}
private void commitPromise(
final HttpRequest promise,
final AsyncPushProducer pushProducer) throws HttpException, IOException {
httpProcessor.process(promise, null, context);
final List<Header> promiseHeaders = DefaultH2RequestConverter.INSTANCE.convert(promise);
outputChannel.push(promiseHeaders, pushProducer);
connMetrics.incrementRequestCount();
}
@Override
public void consumePromise(final List<Header> headers) throws HttpException, IOException {
throw new ProtocolException("Unexpected message promise");
}
@Override
public void consumeHeader(final List<Header> headers, final boolean endStream) throws HttpException, IOException {
if (done.get()) {
throw new ProtocolException("Unexpected message headers");
}
switch (requestState) {
case HEADERS:
requestState = endStream ? MessageState.COMPLETE : MessageState.BODY;
final HttpRequest request = DefaultH2RequestConverter.INSTANCE.convert(headers);
final EntityDetails requestEntityDetails = endStream ? null : new IncomingEntityDetails(request, -1);
final AsyncServerExchangeHandler handler;
try {
handler = exchangeHandlerFactory != null ? exchangeHandlerFactory.create(request, context) : null;
} catch (final ProtocolException ex) {
throw new H2StreamResetException(H2Error.PROTOCOL_ERROR, ex.getMessage());
}
if (handler == null) {
throw new H2StreamResetException(H2Error.REFUSED_STREAM, "Stream refused");
}
exchangeHandler = handler;
context.setProtocolVersion(HttpVersion.HTTP_2);
context.setRequest(request);
try {
httpProcessor.process(request, requestEntityDetails, context);
connMetrics.incrementRequestCount();
receivedRequest = request;
exchangeHandler.handleRequest(request, requestEntityDetails, responseChannel, context);
} catch (final HttpException ex) {
if (!responseCommitted.get()) {
final AsyncResponseProducer responseProducer = new BasicResponseProducer(
ServerSupport.toStatusCode(ex),
ServerSupport.toErrorMessage(ex));
exchangeHandler = new ImmediateResponseExchangeHandler(responseProducer);
exchangeHandler.handleRequest(request, requestEntityDetails, responseChannel, context);
} else {
throw ex;
}
}
break;
case BODY:
responseState = MessageState.COMPLETE;
exchangeHandler.streamEnd(headers);
break;
default:
throw new ProtocolException("Unexpected message headers");
}
}
@Override
public void updateInputCapacity() throws IOException {
Asserts.notNull(exchangeHandler, "Exchange handler");
exchangeHandler.updateCapacity(outputChannel);
}
@Override
public void consumeData(final ByteBuffer src, final boolean endStream) throws HttpException, IOException {
if (done.get() || requestState != MessageState.BODY) {
throw new ProtocolException("Unexpected message data");
}
Asserts.notNull(exchangeHandler, "Exchange handler");
if (src != null) {
exchangeHandler.consume(src);
}
if (endStream) {
requestState = MessageState.COMPLETE;
exchangeHandler.streamEnd(null);
}
}
@Override
public boolean isOutputReady() {
return responseState == MessageState.BODY && exchangeHandler != null && exchangeHandler.available() > 0;
}
@Override
public void produceOutput() throws HttpException, IOException {
if (responseState == MessageState.BODY) {
Asserts.notNull(exchangeHandler, "Exchange handler");
exchangeHandler.produce(dataChannel);
}
}
@Override
public void handle(final HttpException ex, final boolean endStream) throws HttpException, IOException {
if (done.get()) {
throw ex;
}
switch (requestState) {
case HEADERS:
requestState = endStream ? MessageState.COMPLETE : MessageState.BODY;
if (!responseCommitted.get()) {
final AsyncResponseProducer responseProducer = new BasicResponseProducer(
ServerSupport.toStatusCode(ex),
ServerSupport.toErrorMessage(ex));
exchangeHandler = new ImmediateResponseExchangeHandler(responseProducer);
exchangeHandler.handleRequest(null, null, responseChannel, context);
} else {
throw ex;
}
break;
case BODY:
responseState = MessageState.COMPLETE;
default:
throw ex;
}
}
@Override
public void failed(final Exception cause) {
try {
if (failed.compareAndSet(false, true)) {
if (exchangeHandler != null) {
exchangeHandler.failed(cause);
}
}
} finally {
releaseResources();
}
}
@Override
public void releaseResources() {
if (done.compareAndSet(false, true)) {
requestState = MessageState.COMPLETE;
responseState = MessageState.COMPLETE;
if (exchangeHandler != null) {
exchangeHandler.releaseResources();
}
}
}
@Override
public String toString() {
return "[" +
"requestState=" + requestState +
", responseState=" + responseState +
']';
}
}