ClientH2StreamHandler.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.
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*
* 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.HeaderElements;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpHeaders;
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.ProtocolException;
import org.apache.hc.core5.http.impl.BasicHttpConnectionMetrics;
import org.apache.hc.core5.http.impl.IncomingEntityDetails;
import org.apache.hc.core5.http.impl.nio.MessageState;
import org.apache.hc.core5.http.message.StatusLine;
import org.apache.hc.core5.http.nio.AsyncClientExchangeHandler;
import org.apache.hc.core5.http.nio.AsyncPushConsumer;
import org.apache.hc.core5.http.nio.DataStreamChannel;
import org.apache.hc.core5.http.nio.HandlerFactory;
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.impl.DefaultH2RequestConverter;
import org.apache.hc.core5.http2.impl.DefaultH2ResponseConverter;
class ClientH2StreamHandler implements H2StreamHandler {
private final H2StreamChannel outputChannel;
private final DataStreamChannel dataChannel;
private final HttpProcessor httpProcessor;
private final BasicHttpConnectionMetrics connMetrics;
private final AsyncClientExchangeHandler exchangeHandler;
private final HandlerFactory<AsyncPushConsumer> pushHandlerFactory;
private final HttpCoreContext context;
private final AtomicBoolean requestCommitted;
private final AtomicBoolean failed;
private final AtomicBoolean done;
private volatile MessageState requestState;
private volatile MessageState responseState;
ClientH2StreamHandler(
final H2StreamChannel outputChannel,
final HttpProcessor httpProcessor,
final BasicHttpConnectionMetrics connMetrics,
final AsyncClientExchangeHandler exchangeHandler,
final HandlerFactory<AsyncPushConsumer> pushHandlerFactory,
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);
requestState = MessageState.COMPLETE;
}
@Override
public void endStream() throws IOException {
outputChannel.endStream();
requestState = MessageState.COMPLETE;
}
};
this.httpProcessor = httpProcessor;
this.connMetrics = connMetrics;
this.exchangeHandler = exchangeHandler;
this.pushHandlerFactory = pushHandlerFactory;
this.context = context;
this.requestCommitted = new AtomicBoolean();
this.failed = new AtomicBoolean();
this.done = new AtomicBoolean();
this.requestState = MessageState.HEADERS;
this.responseState = MessageState.HEADERS;
}
@Override
public HandlerFactory<AsyncPushConsumer> getPushHandlerFactory() {
return pushHandlerFactory;
}
@Override
public boolean isOutputReady() {
switch (requestState) {
case HEADERS:
return true;
case BODY:
return exchangeHandler.available() > 0;
default:
return false;
}
}
private void commitRequest(final HttpRequest request, final EntityDetails entityDetails) throws HttpException, IOException {
if (requestCommitted.compareAndSet(false, true)) {
context.setProtocolVersion(HttpVersion.HTTP_2);
context.setRequest(request);
httpProcessor.process(request, entityDetails, context);
final List<Header> headers = DefaultH2RequestConverter.INSTANCE.convert(request);
outputChannel.submit(headers, entityDetails == null);
connMetrics.incrementRequestCount();
if (entityDetails == null) {
requestState = MessageState.COMPLETE;
} else {
final Header h = request.getFirstHeader(HttpHeaders.EXPECT);
final boolean expectContinue = h != null && HeaderElements.CONTINUE.equalsIgnoreCase(h.getValue());
if (expectContinue) {
requestState = MessageState.ACK;
} else {
requestState = MessageState.BODY;
exchangeHandler.produce(dataChannel);
}
}
} else {
throw new H2ConnectionException(H2Error.INTERNAL_ERROR, "Request already committed");
}
}
@Override
public void produceOutput() throws HttpException, IOException {
switch (requestState) {
case HEADERS:
exchangeHandler.produceRequest((request, entityDetails, httpContext) -> commitRequest(request, entityDetails), context);
break;
case BODY:
exchangeHandler.produce(dataChannel);
break;
}
}
@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 (responseState) {
case HEADERS:
final HttpResponse response = DefaultH2ResponseConverter.INSTANCE.convert(headers);
final int status = response.getCode();
if (status < HttpStatus.SC_INFORMATIONAL) {
throw new ProtocolException("Invalid response: " + new StatusLine(response));
}
if (status > HttpStatus.SC_CONTINUE && status < HttpStatus.SC_SUCCESS) {
exchangeHandler.consumeInformation(response, context);
}
if (requestState == MessageState.ACK) {
if (status == HttpStatus.SC_CONTINUE || status >= HttpStatus.SC_SUCCESS) {
requestState = MessageState.BODY;
exchangeHandler.produce(dataChannel);
}
}
if (status < HttpStatus.SC_SUCCESS) {
return;
}
final EntityDetails entityDetails = endStream ? null : new IncomingEntityDetails(response, -1);
context.setResponse(response);
httpProcessor.process(response, entityDetails, context);
connMetrics.incrementResponseCount();
exchangeHandler.consumeResponse(response, entityDetails, context);
responseState = endStream ? MessageState.COMPLETE : MessageState.BODY;
break;
case BODY:
responseState = MessageState.COMPLETE;
exchangeHandler.streamEnd(headers);
break;
default:
throw new ProtocolException("Unexpected message headers");
}
}
@Override
public void updateInputCapacity() throws IOException {
exchangeHandler.updateCapacity(outputChannel);
}
@Override
public void consumeData(final ByteBuffer src, final boolean endStream) throws HttpException, IOException {
if (done.get() || responseState != MessageState.BODY) {
throw new ProtocolException("Unexpected message data");
}
if (src != null) {
exchangeHandler.consume(src);
}
if (endStream) {
responseState = MessageState.COMPLETE;
exchangeHandler.streamEnd(null);
}
}
@Override
public void handle(final HttpException ex, final boolean endStream) throws HttpException, IOException {
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)) {
responseState = MessageState.COMPLETE;
requestState = MessageState.COMPLETE;
exchangeHandler.releaseResources();
}
}
@Override
public String toString() {
return "[" +
"requestState=" + requestState +
", responseState=" + responseState +
']';
}
}