io.netty.handler.codec.http2.HttpToHttp2ConnectionHandler Maven / Gradle / Ivy
/*
* Copyright 2014 The Netty Project
*
* The Netty Project 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.
*/
package io.netty.handler.codec.http2;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.http.EmptyHttpHeaders;
import io.netty.handler.codec.http.FullHttpMessage;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpMessage;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.handler.codec.http2.Http2CodecUtil.SimpleChannelPromiseAggregator;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.internal.UnstableApi;
/**
* Translates HTTP/1.x object writes into HTTP/2 frames.
*
* See {@link InboundHttp2ToHttpAdapter} to get translation from HTTP/2 frames to HTTP/1.x objects.
*/
@UnstableApi
public class HttpToHttp2ConnectionHandler extends Http2ConnectionHandler {
private final boolean validateHeaders;
private int currentStreamId;
protected HttpToHttp2ConnectionHandler(Http2ConnectionDecoder decoder, Http2ConnectionEncoder encoder,
Http2Settings initialSettings, boolean validateHeaders) {
super(decoder, encoder, initialSettings);
this.validateHeaders = validateHeaders;
}
/**
* Get the next stream id either from the {@link HttpHeaders} object or HTTP/2 codec
*
* @param httpHeaders The HTTP/1.x headers object to look for the stream id
* @return The stream id to use with this {@link HttpHeaders} object
* @throws Exception If the {@code httpHeaders} object specifies an invalid stream id
*/
private int getStreamId(HttpHeaders httpHeaders) throws Exception {
return httpHeaders.getInt(HttpConversionUtil.ExtensionHeaderNames.STREAM_ID.text(),
connection().local().incrementAndGetNextStreamId());
}
/**
* Handles conversion of {@link HttpMessage} and {@link HttpContent} to HTTP/2 frames.
*/
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
if (!(msg instanceof HttpMessage || msg instanceof HttpContent)) {
ctx.write(msg, promise);
return;
}
boolean release = true;
SimpleChannelPromiseAggregator promiseAggregator =
new SimpleChannelPromiseAggregator(promise, ctx.channel(), ctx.executor());
try {
Http2ConnectionEncoder encoder = encoder();
boolean endStream = false;
if (msg instanceof HttpMessage) {
final HttpMessage httpMsg = (HttpMessage) msg;
// Provide the user the opportunity to specify the streamId
currentStreamId = getStreamId(httpMsg.headers());
// Convert and write the headers.
Http2Headers http2Headers = HttpConversionUtil.toHttp2Headers(httpMsg, validateHeaders);
endStream = msg instanceof FullHttpMessage && !((FullHttpMessage) msg).content().isReadable();
writeHeaders(ctx, encoder, currentStreamId, httpMsg.headers(), http2Headers,
endStream, promiseAggregator);
}
if (!endStream && msg instanceof HttpContent) {
boolean isLastContent = false;
HttpHeaders trailers = EmptyHttpHeaders.INSTANCE;
Http2Headers http2Trailers = EmptyHttp2Headers.INSTANCE;
if (msg instanceof LastHttpContent) {
isLastContent = true;
// Convert any trailing headers.
final LastHttpContent lastContent = (LastHttpContent) msg;
trailers = lastContent.trailingHeaders();
http2Trailers = HttpConversionUtil.toHttp2Headers(trailers, validateHeaders);
}
// Write the data
final ByteBuf content = ((HttpContent) msg).content();
endStream = isLastContent && trailers.isEmpty();
release = false;
encoder.writeData(ctx, currentStreamId, content, 0, endStream, promiseAggregator.newPromise());
if (!trailers.isEmpty()) {
// Write trailing headers.
writeHeaders(ctx, encoder, currentStreamId, trailers, http2Trailers, true, promiseAggregator);
}
}
} catch (Throwable t) {
onError(ctx, true, t);
promiseAggregator.setFailure(t);
} finally {
if (release) {
ReferenceCountUtil.release(msg);
}
promiseAggregator.doneAllocatingPromises();
}
}
private static void writeHeaders(ChannelHandlerContext ctx, Http2ConnectionEncoder encoder, int streamId,
HttpHeaders headers, Http2Headers http2Headers, boolean endStream,
SimpleChannelPromiseAggregator promiseAggregator) {
int dependencyId = headers.getInt(
HttpConversionUtil.ExtensionHeaderNames.STREAM_DEPENDENCY_ID.text(), 0);
short weight = headers.getShort(
HttpConversionUtil.ExtensionHeaderNames.STREAM_WEIGHT.text(), Http2CodecUtil.DEFAULT_PRIORITY_WEIGHT);
encoder.writeHeaders(ctx, streamId, http2Headers, dependencyId, weight, false,
0, endStream, promiseAggregator.newPromise());
}
}