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Asynchronous HTTP/2 RPC/REST client/server library built on top of Java 8, Netty, Thrift and GRPC (armeria-shaded)
/*
* Copyright 2016 LINE Corporation
*
* LINE Corporation 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:
*
* 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 com.linecorp.armeria.server;
import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
import static io.netty.handler.codec.http2.Http2Exception.connectionError;
import static io.netty.handler.codec.http2.Http2Exception.streamError;
import java.nio.charset.StandardCharsets;
import com.linecorp.armeria.common.ClosedSessionException;
import com.linecorp.armeria.common.ContentTooLargeException;
import com.linecorp.armeria.common.HttpHeaderNames;
import com.linecorp.armeria.common.HttpMethod;
import com.linecorp.armeria.common.HttpStatus;
import com.linecorp.armeria.common.MediaType;
import com.linecorp.armeria.internal.ArmeriaHttpUtil;
import com.linecorp.armeria.internal.InboundTrafficController;
import com.linecorp.armeria.unsafe.ByteBufHttpData;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.HttpHeaderValues;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http2.DefaultHttp2Headers;
import io.netty.handler.codec.http2.Http2ConnectionEncoder;
import io.netty.handler.codec.http2.Http2Error;
import io.netty.handler.codec.http2.Http2EventAdapter;
import io.netty.handler.codec.http2.Http2Exception;
import io.netty.handler.codec.http2.Http2Headers;
import io.netty.handler.codec.http2.Http2Settings;
import io.netty.handler.codec.http2.Http2Stream;
import io.netty.util.AsciiString;
import io.netty.util.collection.IntObjectHashMap;
import io.netty.util.collection.IntObjectMap;
final class Http2RequestDecoder extends Http2EventAdapter {
private final ServerConfig cfg;
private final Http2ConnectionEncoder writer;
private final InboundTrafficController inboundTrafficController;
private final IntObjectMap requests = new IntObjectHashMap<>();
private int nextId;
Http2RequestDecoder(ServerConfig cfg, Channel channel, Http2ConnectionEncoder writer) {
this.cfg = cfg;
this.writer = writer;
inboundTrafficController = new InboundTrafficController(channel);
}
@Override
public void onSettingsRead(ChannelHandlerContext ctx, Http2Settings settings) {
ctx.fireChannelRead(settings);
}
@Override
public void onHeadersRead(ChannelHandlerContext ctx, int streamId, Http2Headers headers, int padding,
boolean endOfStream) throws Http2Exception {
DecodedHttpRequest req = requests.get(streamId);
if (req == null) {
// Validate the method.
final CharSequence method = headers.method();
if (method == null) {
writeErrorResponse(ctx, streamId, HttpResponseStatus.BAD_REQUEST);
return;
}
if (!HttpMethod.isSupported(method.toString())) {
writeErrorResponse(ctx, streamId, HttpResponseStatus.METHOD_NOT_ALLOWED);
return;
}
// Validate the 'content-length' header if exists.
final boolean contentEmpty;
if (headers.contains(HttpHeaderNames.CONTENT_LENGTH)) {
final long contentLength = headers.getLong(HttpHeaderNames.CONTENT_LENGTH, -1L);
if (contentLength < 0) {
writeErrorResponse(ctx, streamId, HttpResponseStatus.BAD_REQUEST);
return;
}
contentEmpty = contentLength == 0;
} else {
contentEmpty = true;
}
if (!handle100Continue(ctx, streamId, headers)) {
writeErrorResponse(ctx, streamId, HttpResponseStatus.EXPECTATION_FAILED);
return;
}
req = new DecodedHttpRequest(ctx.channel().eventLoop(), ++nextId, streamId,
ArmeriaHttpUtil.toArmeria(headers, endOfStream), true,
inboundTrafficController, cfg.defaultMaxRequestLength());
// Close the request early when it is sure that there will be
// neither content nor trailing headers.
if (contentEmpty && endOfStream) {
req.close();
}
requests.put(streamId, req);
ctx.fireChannelRead(req);
} else {
try {
req.write(ArmeriaHttpUtil.toArmeria(headers, endOfStream));
} catch (Throwable t) {
req.close(t);
throw connectionError(INTERNAL_ERROR, t, "failed to consume a HEADERS frame");
}
}
if (endOfStream) {
req.close();
}
}
@Override
public void onHeadersRead(
ChannelHandlerContext ctx, int streamId, Http2Headers headers,
int streamDependency, short weight, boolean exclusive, int padding,
boolean endOfStream) throws Http2Exception {
onHeadersRead(ctx, streamId, headers, padding, endOfStream);
}
private boolean handle100Continue(ChannelHandlerContext ctx, int streamId, Http2Headers headers) {
final CharSequence expectValue = headers.get(HttpHeaderNames.EXPECT);
if (expectValue == null) {
// No 'expect' header.
return true;
}
// '100-continue' is the only allowed expectation.
if (!AsciiString.contentEqualsIgnoreCase(HttpHeaderValues.CONTINUE, expectValue)) {
return false;
}
// Send a '100 Continue' response.
writer.writeHeaders(
ctx, streamId,
new DefaultHttp2Headers(false).status(HttpStatus.CONTINUE.codeAsText()),
0, false, ctx.voidPromise());
// Remove the 'expect' header so that it's handled in a way invisible to a Service.
headers.remove(HttpHeaderNames.EXPECT);
return true;
}
@Override
public void onStreamRemoved(Http2Stream stream) {
final DecodedHttpRequest req = requests.remove(stream.id());
if (req != null) {
// Ignored if the stream has already been closed.
req.close(ClosedSessionException.get());
}
}
@Override
public int onDataRead(
ChannelHandlerContext ctx, int streamId, ByteBuf data,
int padding, boolean endOfStream) throws Http2Exception {
final DecodedHttpRequest req = requests.get(streamId);
if (req == null) {
throw connectionError(PROTOCOL_ERROR, "received a DATA Frame for an unknown stream: %d",
streamId);
}
final int dataLength = data.readableBytes();
if (dataLength == 0) {
// Received an empty DATA frame
if (endOfStream) {
req.close();
}
return padding;
}
req.increaseTransferredBytes(dataLength);
final long maxContentLength = req.maxRequestLength();
if (maxContentLength > 0 && req.transferredBytes() > maxContentLength) {
if (req.isOpen()) {
req.close(ContentTooLargeException.get());
}
if (isWritable(streamId)) {
writeErrorResponse(ctx, streamId, HttpResponseStatus.REQUEST_ENTITY_TOO_LARGE);
} else {
// Cannot write to the stream. Just close it.
final Http2Stream stream = writer.connection().stream(streamId);
stream.close();
}
} else if (req.isOpen()) {
try {
req.write(new ByteBufHttpData(data.retain(), endOfStream));
} catch (Throwable t) {
req.close(t);
throw connectionError(INTERNAL_ERROR, t, "failed to consume a DATA frame");
}
if (endOfStream) {
req.close();
}
}
// All bytes have been processed.
return dataLength + padding;
}
private boolean isWritable(int streamId) {
switch (writer.connection().stream(streamId).state()) {
case OPEN:
case HALF_CLOSED_REMOTE:
return true;
default:
return false;
}
}
private void writeErrorResponse(ChannelHandlerContext ctx, int streamId, HttpResponseStatus status) {
final byte[] content = status.toString().getBytes(StandardCharsets.UTF_8);
writer.writeHeaders(
ctx, streamId,
new DefaultHttp2Headers(false)
.status(status.codeAsText())
.set(HttpHeaderNames.CONTENT_TYPE, MediaType.PLAIN_TEXT_UTF_8.toString())
.setInt(HttpHeaderNames.CONTENT_LENGTH, content.length),
0, false, ctx.voidPromise());
writer.writeData(
ctx, streamId, Unpooled.wrappedBuffer(content), 0, true, ctx.voidPromise());
}
@Override
public void onRstStreamRead(ChannelHandlerContext ctx, int streamId, long errorCode) throws Http2Exception {
final DecodedHttpRequest req = requests.get(streamId);
if (req == null) {
throw connectionError(PROTOCOL_ERROR,
"received a RST_STREAM frame for an unknown stream: %d", streamId);
}
req.abortResponse(streamError(
streamId, Http2Error.valueOf(errorCode), "received a RST_STREAM frame"));
}
@Override
public void onPushPromiseRead(ChannelHandlerContext ctx, int streamId, int promisedStreamId,
Http2Headers headers, int padding) throws Http2Exception {
throw connectionError(PROTOCOL_ERROR, "received a PUSH_PROMISE frame which only a server can send");
}
}
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