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/*
* Copyright 2015 The FireNio Project
*
* Licensed 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 com.firenio.codec.http2;
import java.io.IOException;
import com.firenio.buffer.ByteBuf;
import com.firenio.common.ByteUtil;
import com.firenio.common.Util;
import com.firenio.component.Frame;
import com.firenio.component.Channel;
import com.firenio.component.ProtocolCodec;
/**
*
* +-----------------------------------------------+
* | Length (24) |
* +---------------+---------------+---------------+
* | Type (8) | Flags (8) |
* +-+-------------+---------------+-------------------------------+
* |R| Stream Identifier (31) |
* +=+=============================================================+
* | Frame Payload (0...) ...
* +---------------------------------------------------------------+
*
*
* - Length:
* -
*
* The length of the frame payload expressed as an unsigned 24-bit integer.
* Values greater than 214 (16,384) MUST NOT be sent unless the
* receiver has set a larger value for SETTINGS_MAX_FRAME_SIZE.
*
*
* The 9 octets of the frame header are not included in this value.
*
*
* - Type:
* -
*
* The 8-bit type of the frame. The frame type determines the format and
* semantics of the frame. Implementations MUST ignore and discard any frame
* that has a type that is unknown.
*
*
* - Flags:
* -
*
* An 8-bit field reserved for boolean flags specific to the frame type.
*
*
* Flags are assigned semantics specific to the indicated frame type. Flags that
* have no defined semantics for a particular frame type MUST be ignored and
* MUST be left unset (0x0) when sending.
*
*
* - R:
* -
*
* A reserved 1-bit field. The semantics of this bit are undefined, and the bit
* MUST remain unset (0x0) when sending and MUST be ignored when receiving.
*
*
* - Stream Identifier:
* -
*
* A stream identifier (see Section 5.1.1) expressed as an unsigned
* 31-bit integer. The value 0x0 is reserved for frames that are associated with
* the connection as a whole as opposed to an individual stream.
*
*
*
*/
//http://httpwg.org/specs/rfc7540.html
//https://blog.csdn.net/u010129119/article/details/79361949
public class Http2Codec extends ProtocolCodec {
public static final int FLAG_END_HEADERS = 0x4;
public static final int FLAG_END_STREAM = 0x1;
public static final int FLAG_PADDED = 0x8;
public static final int FLAG_PRIORITY = 0x20;
public static final int PROTOCOL_HEADER = 9;
public static final int PROTOCOL_PING = -1;
public static final int PROTOCOL_PONG = -2;
public static final int PROTOCOL_PREFACE_HEADER = 24;
private static final IOException NOT_HTTP2_PROTOCL = Util.unknownStackTrace(new IOException("preface not matched"), Http2Codec.class, "codec");
private static byte[] PREFACE_BINARY = "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n".getBytes();
@Override
public Frame decode(Channel ch, ByteBuf src) throws Exception {
Http2Session session = (Http2Session) ch.getAttachment();
if (session.isPrefaceRead()) {
if (src.readableBytes() < PREFACE_BINARY.length) {
return null;
}
for (int i = 0; i < PREFACE_BINARY.length; i++) {
if (src.readByte() != PREFACE_BINARY[i]) {
throw NOT_HTTP2_PROTOCL;
}
}
session.setPrefaceRead(false);
//这里应该向客户端返回settings帧，先不返回了，等解析完客户端发来的
//settings帧再给客户端返回
Http2SettingsFrame f = new Http2SettingsFrame();
f.setSettings(session.getSettings());
ch.writeAndFlush(f);
return decode(ch, src);
}
if (src.readableBytes() < PROTOCOL_HEADER) {
return null;
}
byte b0 = src.readByte();
byte b1 = src.readByte();
byte b2 = src.readByte();
byte type = src.readByte();
byte flags = src.readByte();
int v = src.readInt();
int length = ((b0 & 0xff) << 8 * 2) | ((b1 & 0xff) << 8 * 1) | ((b2 & 0xff) << 8 * 0);
int streamIdentifier = v & 0xFFFFFFFF;
if (src.readableBytes() < length) {
src.skipRead(-PROTOCOL_HEADER);
return null;
}
Http2FrameType hType = Http2FrameType.getValue(type & 0xff);
return genFrame(session, src, hType, length, streamIdentifier, flags);
}
@Override
protected Object newAttachment() {
return new Http2Session();
}
@Override
public ByteBuf encode(Channel ch, Frame frame) {
Http2Frame f = (Http2Frame) frame;
Http2FrameType frameType = f.getHttp2FrameType();
byte[] payload = null;
switch (frameType) {
case FRAME_TYPE_CONTINUATION:
break;
case FRAME_TYPE_DATA:
break;
case FRAME_TYPE_GOAWAY:
break;
case FRAME_TYPE_HEADERS:
Http2HeadersFrame hf = (Http2HeadersFrame) f;
break;
case FRAME_TYPE_PING:
break;
case FRAME_TYPE_PRIORITY:
break;
case FRAME_TYPE_PUSH_PROMISE:
break;
case FRAME_TYPE_RST_STREAM:
break;
case FRAME_TYPE_SETTINGS:
Http2SettingsFrame sf = (Http2SettingsFrame) f;
long[] settings = sf.getSettings();
payload = new byte[6 * 6];
for (int i = 0; i < 6; i++) {
int realI = i + 1;
int offset = i * 6;
ByteUtil.putShort(payload, (short) realI, offset);
ByteUtil.putInt(payload, (int) settings[realI], offset + 2);
}
break;
case FRAME_TYPE_WINDOW_UPDATE:
break;
default:
break;
}
int length = payload.length;
ByteBuf buf = ch.alloc().allocate(length + PROTOCOL_HEADER);
byte b2 = (byte) ((length & 0xff));
byte b1 = (byte) ((length >> 8 * 1) & 0xff);
byte b0 = (byte) ((length >> 8 * 2) & 0xff);
byte b3 = frameType.getByteValue();
buf.writeByte(b0);
buf.writeByte(b1);
buf.writeByte(b2);
buf.writeByte(b3);
buf.writeByte((byte) 0);
buf.writeInt(f.getStreamIdentifier());
buf.writeBytes(payload);
return buf;
}
private Http2Frame genFrame(Http2Session session, ByteBuf src, Http2FrameType type, int length, int streamIdentifier, byte flags) {
switch (type) {
case FRAME_TYPE_CONTINUATION:
break;
case FRAME_TYPE_DATA:
break;
case FRAME_TYPE_GOAWAY:
break;
case FRAME_TYPE_HEADERS:
Http2HeadersFrame fh = new Http2HeadersFrame();
fh.setFlags(flags);
fh.setStreamIdentifier(streamIdentifier);
fh.setEndStream((flags & FLAG_END_STREAM) > 0);
if ((flags & FLAG_PADDED) > 0) {
fh.setPadLength(src.readByte());
}
int streamDependency = 0;
if ((flags & FLAG_PRIORITY) > 0) {
streamDependency = src.readInt();
boolean e = streamDependency < 0;
if (e) {
streamDependency = streamDependency & 0x7FFFFFFF;
}
short weight = src.readUnsignedByte();
fh.setE(e);
fh.setStreamDependency(streamDependency);
fh.setWeight(weight);
}
// decoder.decode(streamDependency, src, session.getHttp2Headers());
return fh;
case FRAME_TYPE_PING:
break;
case FRAME_TYPE_PRIORITY:
break;
case FRAME_TYPE_PUSH_PROMISE:
break;
case FRAME_TYPE_RST_STREAM:
break;
case FRAME_TYPE_SETTINGS:
Http2SettingsFrame fs = new Http2SettingsFrame();
fs.setFlags(flags);
fs.setStreamIdentifier(streamIdentifier);
int settings = length / 6;
for (int i = 0; i < settings; i++) {
int key = src.readShort();
int value = src.readInt();
session.setSettings(key, value);
}
fs.setSettings(session.getSettings());
return fs;
case FRAME_TYPE_WINDOW_UPDATE:
Http2WindowUpdateFrame fw = new Http2WindowUpdateFrame();
fw.setFlags(flags);
fw.setStreamIdentifier(streamIdentifier);
fw.setUpdateValue(ByteUtil.getInt31(src.readInt()));
return fw;
default:
break;
}
throw new IllegalArgumentException(type.toString());
}
@Override
public String getProtocolId() {
return "Http2";
}
@Override
public int getHeaderLength() {
return PROTOCOL_HEADER;
}
}
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