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io.netty.handler.codec.spdy.SpdyFrameEncoder 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.spdy;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import java.nio.ByteOrder;
import java.util.Set;
import static io.netty.handler.codec.spdy.SpdyCodecUtil.*;
/**
* Encodes a SPDY Frame into a {@link ByteBuf}.
*/
public class SpdyFrameEncoder {
private final int version;
/**
* Creates a new instance with the specified {@code spdyVersion}.
*/
public SpdyFrameEncoder(SpdyVersion spdyVersion) {
if (spdyVersion == null) {
throw new NullPointerException("spdyVersion");
}
version = spdyVersion.getVersion();
}
private void writeControlFrameHeader(ByteBuf buffer, int type, byte flags, int length) {
buffer.writeShort(version | 0x8000);
buffer.writeShort(type);
buffer.writeByte(flags);
buffer.writeMedium(length);
}
public ByteBuf encodeDataFrame(ByteBufAllocator allocator, int streamId, boolean last, ByteBuf data) {
byte flags = last ? SPDY_DATA_FLAG_FIN : 0;
int length = data.readableBytes();
ByteBuf frame = allocator.ioBuffer(SPDY_HEADER_SIZE + length).order(ByteOrder.BIG_ENDIAN);
frame.writeInt(streamId & 0x7FFFFFFF);
frame.writeByte(flags);
frame.writeMedium(length);
frame.writeBytes(data, data.readerIndex(), length);
return frame;
}
public ByteBuf encodeSynStreamFrame(ByteBufAllocator allocator, int streamId, int associatedToStreamId,
byte priority, boolean last, boolean unidirectional, ByteBuf headerBlock) {
int headerBlockLength = headerBlock.readableBytes();
byte flags = last ? SPDY_FLAG_FIN : 0;
if (unidirectional) {
flags |= SPDY_FLAG_UNIDIRECTIONAL;
}
int length = 10 + headerBlockLength;
ByteBuf frame = allocator.ioBuffer(SPDY_HEADER_SIZE + length).order(ByteOrder.BIG_ENDIAN);
writeControlFrameHeader(frame, SPDY_SYN_STREAM_FRAME, flags, length);
frame.writeInt(streamId);
frame.writeInt(associatedToStreamId);
frame.writeShort((priority & 0xFF) << 13);
frame.writeBytes(headerBlock, headerBlock.readerIndex(), headerBlockLength);
return frame;
}
public ByteBuf encodeSynReplyFrame(ByteBufAllocator allocator, int streamId, boolean last, ByteBuf headerBlock) {
int headerBlockLength = headerBlock.readableBytes();
byte flags = last ? SPDY_FLAG_FIN : 0;
int length = 4 + headerBlockLength;
ByteBuf frame = allocator.ioBuffer(SPDY_HEADER_SIZE + length).order(ByteOrder.BIG_ENDIAN);
writeControlFrameHeader(frame, SPDY_SYN_REPLY_FRAME, flags, length);
frame.writeInt(streamId);
frame.writeBytes(headerBlock, headerBlock.readerIndex(), headerBlockLength);
return frame;
}
public ByteBuf encodeRstStreamFrame(ByteBufAllocator allocator, int streamId, int statusCode) {
byte flags = 0;
int length = 8;
ByteBuf frame = allocator.ioBuffer(SPDY_HEADER_SIZE + length).order(ByteOrder.BIG_ENDIAN);
writeControlFrameHeader(frame, SPDY_RST_STREAM_FRAME, flags, length);
frame.writeInt(streamId);
frame.writeInt(statusCode);
return frame;
}
public ByteBuf encodeSettingsFrame(ByteBufAllocator allocator, SpdySettingsFrame spdySettingsFrame) {
Set ids = spdySettingsFrame.ids();
int numSettings = ids.size();
byte flags = spdySettingsFrame.clearPreviouslyPersistedSettings() ?
SPDY_SETTINGS_CLEAR : 0;
int length = 4 + 8 * numSettings;
ByteBuf frame = allocator.ioBuffer(SPDY_HEADER_SIZE + length).order(ByteOrder.BIG_ENDIAN);
writeControlFrameHeader(frame, SPDY_SETTINGS_FRAME, flags, length);
frame.writeInt(numSettings);
for (Integer id : ids) {
flags = 0;
if (spdySettingsFrame.isPersistValue(id)) {
flags |= SPDY_SETTINGS_PERSIST_VALUE;
}
if (spdySettingsFrame.isPersisted(id)) {
flags |= SPDY_SETTINGS_PERSISTED;
}
frame.writeByte(flags);
frame.writeMedium(id);
frame.writeInt(spdySettingsFrame.getValue(id));
}
return frame;
}
public ByteBuf encodePingFrame(ByteBufAllocator allocator, int id) {
byte flags = 0;
int length = 4;
ByteBuf frame = allocator.ioBuffer(SPDY_HEADER_SIZE + length).order(ByteOrder.BIG_ENDIAN);
writeControlFrameHeader(frame, SPDY_PING_FRAME, flags, length);
frame.writeInt(id);
return frame;
}
public ByteBuf encodeGoAwayFrame(ByteBufAllocator allocator, int lastGoodStreamId, int statusCode) {
byte flags = 0;
int length = 8;
ByteBuf frame = allocator.ioBuffer(SPDY_HEADER_SIZE + length).order(ByteOrder.BIG_ENDIAN);
writeControlFrameHeader(frame, SPDY_GOAWAY_FRAME, flags, length);
frame.writeInt(lastGoodStreamId);
frame.writeInt(statusCode);
return frame;
}
public ByteBuf encodeHeadersFrame(ByteBufAllocator allocator, int streamId, boolean last, ByteBuf headerBlock) {
int headerBlockLength = headerBlock.readableBytes();
byte flags = last ? SPDY_FLAG_FIN : 0;
int length = 4 + headerBlockLength;
ByteBuf frame = allocator.ioBuffer(SPDY_HEADER_SIZE + length).order(ByteOrder.BIG_ENDIAN);
writeControlFrameHeader(frame, SPDY_HEADERS_FRAME, flags, length);
frame.writeInt(streamId);
frame.writeBytes(headerBlock, headerBlock.readerIndex(), headerBlockLength);
return frame;
}
public ByteBuf encodeWindowUpdateFrame(ByteBufAllocator allocator, int streamId, int deltaWindowSize) {
byte flags = 0;
int length = 8;
ByteBuf frame = allocator.ioBuffer(SPDY_HEADER_SIZE + length).order(ByteOrder.BIG_ENDIAN);
writeControlFrameHeader(frame, SPDY_WINDOW_UPDATE_FRAME, flags, length);
frame.writeInt(streamId);
frame.writeInt(deltaWindowSize);
return frame;
}
}
