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/*
* Copyright (c) 2015 Uber Technologies, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.uber.tchannel.codecs;
import com.uber.tchannel.checksum.ChecksumType;
import com.uber.tchannel.tracing.Trace;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.CompositeByteBuf;
import io.netty.buffer.Unpooled;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public final class CodecUtils {
public static int decodeChecksum(ChecksumType checksumType, ByteBuf buffer) {
switch (checksumType) {
case Adler32:
case FarmhashFingerPrint32:
case CRC32C:
return buffer.readInt();
case NoChecksum:
default:
return 0;
}
}
public static void encodeChecksum(int checksum, ChecksumType checksumType, ByteBuf buffer) {
switch (checksumType) {
case Adler32:
case FarmhashFingerPrint32:
case CRC32C:
buffer.writeInt(checksum);
break;
case NoChecksum:
default:
break;
}
}
public static String decodeString(ByteBuf buffer) {
int valueLength = buffer.readUnsignedShort();
byte[] valueBytes = new byte[valueLength];
buffer.readBytes(valueBytes);
return new String(valueBytes);
}
public static void encodeString(String value, ByteBuf buffer) {
byte[] raw = value.getBytes();
buffer.writeShort(raw.length);
buffer.writeBytes(raw);
}
public static String decodeSmallString(ByteBuf buffer) {
int valueLength = buffer.readUnsignedByte();
byte[] valueBytes = new byte[valueLength];
buffer.readBytes(valueBytes);
return new String(valueBytes);
}
public static void encodeSmallString(String value, ByteBuf buffer) {
byte[] raw = value.getBytes();
buffer.writeByte(raw.length);
buffer.writeBytes(raw);
}
public static Map decodeHeaders(ByteBuf buffer) {
int numHeaders = buffer.readUnsignedShort();
Map headers = new HashMap(numHeaders);
for (int i = 0; i < numHeaders; i++) {
String key = CodecUtils.decodeString(buffer);
String value = CodecUtils.decodeString(buffer);
headers.put(key, value);
}
return headers;
}
public static void encodeHeaders(Map headers, ByteBuf buffer) {
buffer.writeShort(headers.size());
for (Map.Entry header : headers.entrySet()) {
CodecUtils.encodeString(header.getKey(), buffer);
CodecUtils.encodeString(header.getValue(), buffer);
}
}
public static Map decodeSmallHeaders(ByteBuf buffer) {
short numHeaders = buffer.readUnsignedByte();
Map headers = new HashMap(numHeaders);
for (int i = 0; i < numHeaders; i++) {
String key = CodecUtils.decodeSmallString(buffer);
String value = CodecUtils.decodeSmallString(buffer);
headers.put(key, value);
}
return headers;
}
public static void encodeSmallHeaders(Map headers, ByteBuf buffer) {
buffer.writeByte(headers.size());
for (Map.Entry header : headers.entrySet()) {
CodecUtils.encodeSmallString(header.getKey(), buffer);
CodecUtils.encodeSmallString(header.getValue(), buffer);
}
}
public static Trace decodeTrace(ByteBuf buffer) {
long spanId = buffer.readLong();
long parentId = buffer.readLong();
long traceId = buffer.readLong();
byte traceFlags = buffer.readByte();
return new Trace(spanId, parentId, traceId, traceFlags);
}
public static void encodeTrace(Trace trace, ByteBuf buffer) {
buffer.writeLong(trace.spanId)
.writeLong(trace.parentId)
.writeLong(trace.traceId)
.writeByte(trace.traceFlags);
}
public static int writeArg(ByteBufAllocator allocator, ByteBuf arg, int writableBytes, List bufs) {
if (writableBytes <= TFrame.FRAME_SIZE_LENGTH) {
throw new UnsupportedOperationException("writableBytes must be larger than " + TFrame.FRAME_SIZE_LENGTH);
}
int readableBytes = arg.readableBytes();
int headerSize = TFrame.FRAME_SIZE_LENGTH;
int chunkLength = Math.min(readableBytes + headerSize, writableBytes);
ByteBuf sizeBuf = allocator.buffer(TFrame.FRAME_SIZE_LENGTH);
bufs.add(sizeBuf);
// Write the size of the `arg`
sizeBuf.writeShort(chunkLength - headerSize);
if (readableBytes == 0) {
return TFrame.FRAME_SIZE_LENGTH;
} else {
bufs.add(arg.readSlice(chunkLength - headerSize).retain());
return chunkLength;
}
}
public static ByteBuf writeArgs(ByteBufAllocator allocator,
ByteBuf header,
List args) {
int writableBytes = TFrame.MAX_FRAME_PAYLOAD_LENGTH - header.readableBytes();
List bufs = new ArrayList<>(7);
bufs.add(header);
while (!args.isEmpty()) {
ByteBuf arg = args.get(0);
int len = writeArg(allocator, arg, writableBytes, bufs);
writableBytes -= len;
if (writableBytes <= TFrame.FRAME_SIZE_LENGTH) {
break;
}
if (arg.readableBytes() == 0) {
args.remove(0);
}
}
CompositeByteBuf comp = allocator.compositeBuffer();
comp.addComponents(bufs);
comp.writerIndex(TFrame.MAX_FRAME_PAYLOAD_LENGTH - writableBytes);
return comp;
}
public static ByteBuf writeArgCopy(ByteBufAllocator allocator, ByteBuf payload, ByteBuf arg, int writableBytes) {
if (writableBytes <= TFrame.FRAME_SIZE_LENGTH) {
throw new UnsupportedOperationException("writableBytes must be larger than " + TFrame.FRAME_SIZE_LENGTH);
}
int readableBytes = arg.readableBytes();
int headerSize = TFrame.FRAME_SIZE_LENGTH;
int chunkLength = Math.min(readableBytes + headerSize, writableBytes);
// Write the size of the `arg`
payload.writeShort(chunkLength - headerSize);
if (readableBytes == 0) {
return payload;
} else {
return payload.writeBytes(arg, chunkLength - headerSize);
}
}
public static ByteBuf writeArgsCopy(ByteBufAllocator allocator,
ByteBuf header,
List args) {
ByteBuf payload = allocator.buffer(header.readableBytes(), TFrame.MAX_FRAME_PAYLOAD_LENGTH);
payload.writeBytes(header);
header.release();
int writableBytes = TFrame.MAX_FRAME_PAYLOAD_LENGTH - payload.readableBytes();
while (!args.isEmpty()) {
ByteBuf arg = args.get(0);
writeArgCopy(allocator, payload, arg, writableBytes);
writableBytes = TFrame.MAX_FRAME_PAYLOAD_LENGTH - payload.readableBytes();
if (writableBytes <= TFrame.FRAME_SIZE_LENGTH) {
break;
}
if (arg.readableBytes() == 0) {
args.remove(0);
}
}
return payload;
}
public static ByteBuf compose(ByteBuf first, ByteBuf second) {
if (first == Unpooled.EMPTY_BUFFER) {
return second;
} else if (second == Unpooled.EMPTY_BUFFER) {
return first;
} else {
return Unpooled.wrappedBuffer(first, second);
}
}
public static ByteBuf readArg(ByteBuf buffer) {
if (buffer.readableBytes() < TFrame.FRAME_SIZE_LENGTH) {
return null;
}
int len = buffer.readUnsignedShort();
if (len > buffer.readableBytes()) {
throw new UnsupportedOperationException("wrong read index for args");
} else if (len == 0) {
return Unpooled.EMPTY_BUFFER;
}
/* Read a slice, retain a copy */
ByteBuf arg = buffer.readSlice(len);
arg.retain();
return arg;
}
public static void readArgs(List args, ByteBuf buffer) {
ByteBuf arg = null;
if (args.isEmpty()) {
args.add(Unpooled.EMPTY_BUFFER);
}
boolean first = true;
while (true) {
arg = readArg(buffer);
if (arg == null) {
return;
} else if (first) {
first = false;
ByteBuf prev = args.get(args.size() - 1);
args.set(args.size() - 1, compose(prev, arg));
} else {
args.add(arg);
}
}
}
}
