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003f012cb7f5224770eaca985cc96b53da496834
mvfst/quic/codec/QuicWriteCodec.cpp
Matt Joras 003f012cb7 TODO comment cleanup. 
Summary:
These are either no longer relevant, are unlikely to be done, or are spculative enough that they don't deserve code space.

Hope here is to make our search for TODOs higher signal.

Reviewed By: lnicco

Differential Revision: D29769792

fbshipit-source-id: 7cfa62cdc15e72d8b7b0cd5dbb5913ea3ca3dc5a
2021-07-20 10:27:32 -07:00

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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
*/
#include <quic/codec/QuicWriteCodec.h>
#include <algorithm>
#include <quic/QuicConstants.h>
#include <quic/QuicException.h>
#include <quic/codec/QuicInteger.h>
namespace {
bool packetSpaceCheck(uint64_t limit, size_t require);
/**
* A helper function to check if there are enough space to write in the packet.
* Return: true if there is enough space, false otherwise
*/
bool packetSpaceCheck(uint64_t limit, size_t require) {
return (folly::to<uint64_t>(require) <= limit);
}
} // namespace
namespace quic {
folly::Optional<uint64_t> writeStreamFrameHeader(
PacketBuilderInterface& builder,
StreamId id,
uint64_t offset,
uint64_t writeBufferLen,
uint64_t flowControlLen,
bool fin,
folly::Optional<bool> skipLenHint) {
if (builder.remainingSpaceInPkt() == 0) {
return folly::none;
}
if (writeBufferLen == 0 && !fin) {
throw QuicInternalException(
"No data or fin supplied when writing stream.",
LocalErrorCode::INTERNAL_ERROR);
}
StreamTypeField::Builder streamTypeBuilder;
QuicInteger idInt(id);
// First account for the things that are non-optional: frame type and stream
// id.
uint64_t headerSize = sizeof(uint8_t) + idInt.getSize();
if (builder.remainingSpaceInPkt() < headerSize) {
VLOG(4) << "No space in packet for stream header. stream=" << id
<< " remaining=" << builder.remainingSpaceInPkt();
return folly::none;
}
QuicInteger offsetInt(offset);
if (offset != 0) {
streamTypeBuilder.setOffset();
headerSize += offsetInt.getSize();
}
// Next we have to deal with the data length. This is trickier. The length of
// data we are able to send depends on 3 things: how much we have in the
// buffer, how much flow control we have, and the remaining size in the
// packet. If the amount we want to send is >= the remaining packet size after
// the header so far we can omit the length field and consume the rest of the
// packet. If it is not then we need to use the minimal varint encoding
// possible to avoid sending not-full packets.
// Note: we don't bother with one potential optimization, which is writing
// a zero length fin-only stream frame and omitting the length field.
uint64_t dataLen = std::min(writeBufferLen, flowControlLen);
uint64_t dataLenLen = 0;
bool shouldSkipLengthField;
if (skipLenHint) {
shouldSkipLengthField = *skipLenHint;
} else {
// Check if we can fill the entire packet with the rest of this stream frame
shouldSkipLengthField =
dataLen > 0 && dataLen >= builder.remainingSpaceInPkt() - headerSize;
}
// At most we can write the minimal between data length and what the packet
// builder allows us to write.
dataLen = std::min(dataLen, builder.remainingSpaceInPkt() - headerSize);
if (!shouldSkipLengthField) {
if (dataLen <= kOneByteLimit - 1) {
dataLenLen = 1;
} else if (dataLen <= kTwoByteLimit - 2) {
dataLenLen = 2;
} else if (dataLen <= kFourByteLimit - 4) {
dataLenLen = 4;
} else if (dataLen <= kEightByteLimit - 8) {
dataLenLen = 8;
} else {
// This should never really happen as dataLen is bounded by the remaining
// space in the packet which should be << kEightByteLimit.
throw QuicInternalException(
"Stream frame length too large.", LocalErrorCode::INTERNAL_ERROR);
}
}
if (dataLenLen > 0) {
if (dataLen != 0 &&
headerSize + dataLenLen >= builder.remainingSpaceInPkt()) {
VLOG(4) << "No space in packet for stream header. stream=" << id
<< " remaining=" << builder.remainingSpaceInPkt();
return folly::none;
}
// We have to encode the actual data length in the header.
headerSize += dataLenLen;
if (builder.remainingSpaceInPkt() < dataLen + headerSize) {
dataLen = builder.remainingSpaceInPkt() - headerSize;
}
}
bool shouldSetFin = fin && dataLen == writeBufferLen;
if (dataLen == 0 && !shouldSetFin) {
// This would be an empty non-fin stream frame.
return folly::none;
}
if (builder.remainingSpaceInPkt() < headerSize) {
VLOG(4) << "No space in packet for stream header. stream=" << id
<< " remaining=" << builder.remainingSpaceInPkt();
return folly::none;
}
// Done with the accounting, set the bits and write the actual frame header.
if (dataLenLen > 0) {
streamTypeBuilder.setLength();
}
if (shouldSetFin) {
streamTypeBuilder.setFin();
}
auto streamType = streamTypeBuilder.build();
builder.writeBE(streamType.fieldValue());
builder.write(idInt);
if (offset != 0) {
builder.write(offsetInt);
}
if (dataLenLen > 0) {
builder.write(QuicInteger(dataLen));
}
builder.appendFrame(
WriteStreamFrame(id, offset, dataLen, streamType.hasFin()));
DCHECK(dataLen <= builder.remainingSpaceInPkt());
return folly::make_optional(dataLen);
}
void writeStreamFrameData(
PacketBuilderInterface& builder,
const BufQueue& writeBuffer,
uint64_t dataLen) {
if (dataLen > 0) {
builder.insert(writeBuffer, dataLen);
}
}
void writeStreamFrameData(
PacketBuilderInterface& builder,
Buf writeBuffer,
uint64_t dataLen) {
if (dataLen > 0) {
builder.insert(std::move(writeBuffer), dataLen);
}
}
folly::Optional<WriteCryptoFrame> writeCryptoFrame(
uint64_t offsetIn,
const BufQueue& data,
PacketBuilderInterface& builder) {
uint64_t spaceLeftInPkt = builder.remainingSpaceInPkt();
QuicInteger intFrameType(static_cast<uint8_t>(FrameType::CRYPTO_FRAME));
QuicInteger offsetInteger(offsetIn);
size_t lengthBytes = 2;
size_t cryptoFrameHeaderSize =
intFrameType.getSize() + offsetInteger.getSize() + lengthBytes;
if (spaceLeftInPkt <= cryptoFrameHeaderSize) {
VLOG(3) << "No space left in packet to write cryptoFrame header of size: "
<< cryptoFrameHeaderSize << ", space left=" << spaceLeftInPkt;
return folly::none;
}
size_t spaceRemaining = spaceLeftInPkt - cryptoFrameHeaderSize;
size_t dataLength = data.chainLength();
size_t writableData = std::min(dataLength, spaceRemaining);
QuicInteger lengthVarInt(writableData);
if (lengthVarInt.getSize() > lengthBytes) {
throw QuicInternalException(
std::string("Length bytes representation"),
LocalErrorCode::CODEC_ERROR);
}
builder.write(intFrameType);
builder.write(offsetInteger);
builder.write(lengthVarInt);
builder.insert(data, writableData);
builder.appendFrame(WriteCryptoFrame(offsetIn, lengthVarInt.getValue()));
return WriteCryptoFrame(offsetIn, lengthVarInt.getValue());
}
/*
* This function will fill the parameter ack frame with ack blocks from the
* parameter ackBlocks until it runs out of space (bytesLimit). The largest
* ack block should have been inserted by the caller.
*/
static size_t fillFrameWithAckBlocks(
const AckBlocks& ackBlocks,
WriteAckFrame& ackFrame,
uint64_t bytesLimit) {
PacketNum currentSeqNum = ackBlocks.crbegin()->start;
// starts off with 0 which is what we assumed the initial ack block to be for
// the largest acked.
size_t numAdditionalAckBlocks = 0;
size_t previousNumAckBlocks = 0;
// Skip the largest, as it has already been emplaced.
for (auto blockItr = ackBlocks.crbegin() + 1; blockItr != ackBlocks.crend();
++blockItr) {
const auto& currBlock = *blockItr;
// These must be true because of the properties of the interval set.
CHECK_GE(currentSeqNum, currBlock.end + 2);
PacketNum gap = currentSeqNum - currBlock.end - 2;
PacketNum currBlockLen = currBlock.end - currBlock.start;
// TODO this is still extra work, as we end up duplicating these
// calculations in the caller, we could store the results so they
// can be reused by the caller when writing the frame.
size_t gapSize = getQuicIntegerSizeThrows(gap);
size_t currBlockLenSize = getQuicIntegerSizeThrows(currBlockLen);
size_t numAdditionalAckBlocksSize =
getQuicIntegerSizeThrows(numAdditionalAckBlocks + 1);
size_t previousNumAckBlocksSize =
getQuicIntegerSizeThrows(previousNumAckBlocks);
size_t additionalSize = gapSize + currBlockLenSize +
(numAdditionalAckBlocksSize - previousNumAckBlocksSize);
if (bytesLimit < additionalSize) {
break;
}
numAdditionalAckBlocks++;
bytesLimit -= additionalSize;
previousNumAckBlocks = numAdditionalAckBlocks;
currentSeqNum = currBlock.start;
ackFrame.ackBlocks.emplace_back(currBlock.start, currBlock.end);
}
return numAdditionalAckBlocks;
}
folly::Optional<AckFrameWriteResult> writeAckFrame(
const quic::AckFrameMetaData& ackFrameMetaData,
PacketBuilderInterface& builder) {
if (ackFrameMetaData.ackBlocks.empty()) {
return folly::none;
}
// The last block must be the largest block.
auto largestAckedPacket = ackFrameMetaData.ackBlocks.back().end;
// ackBlocks are already an interval set so each value is naturally
// non-overlapping.
auto firstAckBlockLength =
largestAckedPacket - ackFrameMetaData.ackBlocks.back().start;
WriteAckFrame ackFrame;
uint64_t spaceLeft = builder.remainingSpaceInPkt();
uint64_t beginningSpace = spaceLeft;
ackFrame.ackBlocks.reserve(spaceLeft / 4);
// We could technically split the range if the size of the representation of
// the integer is too large, but that gets super tricky and is of dubious
// value.
QuicInteger largestAckedPacketInt(largestAckedPacket);
QuicInteger firstAckBlockLengthInt(firstAckBlockLength);
// Convert ackDelay to unsigned value explicitly before right shifting to
// avoid issues with right shifting signed values.
uint64_t encodedAckDelay = ackFrameMetaData.ackDelay.count();
encodedAckDelay = encodedAckDelay >> ackFrameMetaData.ackDelayExponent;
QuicInteger ackDelayInt(encodedAckDelay);
QuicInteger minAdditionalAckBlockCount(0);
// Required fields are Type, LargestAcked, AckDelay, AckBlockCount,
// firstAckBlockLength
QuicInteger encodedintFrameType(static_cast<uint8_t>(FrameType::ACK));
auto headerSize = encodedintFrameType.getSize() +
largestAckedPacketInt.getSize() + ackDelayInt.getSize() +
minAdditionalAckBlockCount.getSize() + firstAckBlockLengthInt.getSize();
if (spaceLeft < headerSize) {
return folly::none;
}
spaceLeft -= headerSize;
ackFrame.ackBlocks.push_back(ackFrameMetaData.ackBlocks.back());
auto numAdditionalAckBlocks =
fillFrameWithAckBlocks(ackFrameMetaData.ackBlocks, ackFrame, spaceLeft);
QuicInteger numAdditionalAckBlocksInt(numAdditionalAckBlocks);
builder.write(encodedintFrameType);
builder.write(largestAckedPacketInt);
builder.write(ackDelayInt);
builder.write(numAdditionalAckBlocksInt);
builder.write(firstAckBlockLengthInt);
PacketNum currentSeqNum = ackFrameMetaData.ackBlocks.back().start;
for (auto it = ackFrame.ackBlocks.cbegin() + 1;
it != ackFrame.ackBlocks.cend();
++it) {
CHECK_GE(currentSeqNum, it->end + 2);
PacketNum gap = currentSeqNum - it->end - 2;
PacketNum currBlockLen = it->end - it->start;
QuicInteger gapInt(gap);
QuicInteger currentBlockLenInt(currBlockLen);
builder.write(gapInt);
builder.write(currentBlockLenInt);
currentSeqNum = it->start;
}
ackFrame.ackDelay = ackFrameMetaData.ackDelay;
builder.appendFrame(std::move(ackFrame));
return AckFrameWriteResult(
beginningSpace - builder.remainingSpaceInPkt(),
1 + numAdditionalAckBlocks);
}
size_t writeSimpleFrame(
QuicSimpleFrame&& frame,
PacketBuilderInterface& builder) {
using FrameTypeType = std::underlying_type<FrameType>::type;
uint64_t spaceLeft = builder.remainingSpaceInPkt();
switch (frame.type()) {
case QuicSimpleFrame::Type::StopSendingFrame: {
const StopSendingFrame& stopSendingFrame = *frame.asStopSendingFrame();
QuicInteger intFrameType(static_cast<uint8_t>(FrameType::STOP_SENDING));
QuicInteger streamId(stopSendingFrame.streamId);
QuicInteger errorCode(static_cast<uint64_t>(stopSendingFrame.errorCode));
size_t errorSize = errorCode.getSize();
auto stopSendingFrameSize =
intFrameType.getSize() + streamId.getSize() + errorSize;
if (packetSpaceCheck(spaceLeft, stopSendingFrameSize)) {
builder.write(intFrameType);
builder.write(streamId);
builder.write(errorCode);
builder.appendFrame(QuicSimpleFrame(std::move(stopSendingFrame)));
return stopSendingFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicSimpleFrame::Type::PathChallengeFrame: {
const PathChallengeFrame& pathChallengeFrame =
*frame.asPathChallengeFrame();
QuicInteger frameType(static_cast<uint8_t>(FrameType::PATH_CHALLENGE));
auto pathChallengeFrameSize =
frameType.getSize() + sizeof(pathChallengeFrame.pathData);
if (packetSpaceCheck(spaceLeft, pathChallengeFrameSize)) {
builder.write(frameType);
builder.writeBE(pathChallengeFrame.pathData);
builder.appendFrame(QuicSimpleFrame(std::move(pathChallengeFrame)));
return pathChallengeFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicSimpleFrame::Type::PathResponseFrame: {
const PathResponseFrame& pathResponseFrame = *frame.asPathResponseFrame();
QuicInteger frameType(static_cast<uint8_t>(FrameType::PATH_RESPONSE));
auto pathResponseFrameSize =
frameType.getSize() + sizeof(pathResponseFrame.pathData);
if (packetSpaceCheck(spaceLeft, pathResponseFrameSize)) {
builder.write(frameType);
builder.writeBE(pathResponseFrame.pathData);
builder.appendFrame(QuicSimpleFrame(std::move(pathResponseFrame)));
return pathResponseFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicSimpleFrame::Type::NewConnectionIdFrame: {
const NewConnectionIdFrame& newConnectionIdFrame =
*frame.asNewConnectionIdFrame();
QuicInteger frameType(static_cast<uint8_t>(FrameType::NEW_CONNECTION_ID));
QuicInteger sequenceNumber(newConnectionIdFrame.sequenceNumber);
QuicInteger retirePriorTo(newConnectionIdFrame.retirePriorTo);
// Include an 8-bit unsigned integer containing the length of the connId
auto newConnectionIdFrameSize = frameType.getSize() +
sequenceNumber.getSize() + retirePriorTo.getSize() + sizeof(uint8_t) +
newConnectionIdFrame.connectionId.size() +
newConnectionIdFrame.token.size();
if (packetSpaceCheck(spaceLeft, newConnectionIdFrameSize)) {
builder.write(frameType);
builder.write(sequenceNumber);
builder.write(retirePriorTo);
builder.writeBE(newConnectionIdFrame.connectionId.size());
builder.push(
newConnectionIdFrame.connectionId.data(),
newConnectionIdFrame.connectionId.size());
builder.push(
newConnectionIdFrame.token.data(),
newConnectionIdFrame.token.size());
builder.appendFrame(QuicSimpleFrame(std::move(newConnectionIdFrame)));
return newConnectionIdFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicSimpleFrame::Type::MaxStreamsFrame: {
const MaxStreamsFrame& maxStreamsFrame = *frame.asMaxStreamsFrame();
auto frameType = maxStreamsFrame.isForBidirectionalStream()
? FrameType::MAX_STREAMS_BIDI
: FrameType::MAX_STREAMS_UNI;
QuicInteger intFrameType(static_cast<FrameTypeType>(frameType));
QuicInteger streamCount(maxStreamsFrame.maxStreams);
auto maxStreamsFrameSize = intFrameType.getSize() + streamCount.getSize();
if (packetSpaceCheck(spaceLeft, maxStreamsFrameSize)) {
builder.write(intFrameType);
builder.write(streamCount);
builder.appendFrame(QuicSimpleFrame(maxStreamsFrame));
return maxStreamsFrameSize;
}
return size_t(0);
}
case QuicSimpleFrame::Type::RetireConnectionIdFrame: {
const RetireConnectionIdFrame& retireConnectionIdFrame =
*frame.asRetireConnectionIdFrame();
QuicInteger frameType(
static_cast<uint8_t>(FrameType::RETIRE_CONNECTION_ID));
QuicInteger sequence(retireConnectionIdFrame.sequenceNumber);
auto retireConnectionIdFrameSize =
frameType.getSize() + sequence.getSize();
if (packetSpaceCheck(spaceLeft, retireConnectionIdFrameSize)) {
builder.write(frameType);
builder.write(sequence);
builder.appendFrame(QuicSimpleFrame(retireConnectionIdFrame));
return retireConnectionIdFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicSimpleFrame::Type::HandshakeDoneFrame: {
const HandshakeDoneFrame& handshakeDoneFrame =
*frame.asHandshakeDoneFrame();
CHECK(builder.getPacketHeader().asShort());
QuicInteger intFrameType(static_cast<uint8_t>(FrameType::HANDSHAKE_DONE));
if (packetSpaceCheck(spaceLeft, intFrameType.getSize())) {
builder.write(intFrameType);
builder.appendFrame(QuicSimpleFrame(handshakeDoneFrame));
return intFrameType.getSize();
}
// no space left in packet
return size_t(0);
}
case QuicSimpleFrame::Type::KnobFrame: {
const KnobFrame& knobFrame = *frame.asKnobFrame();
QuicInteger intFrameType(static_cast<uint64_t>(FrameType::KNOB));
QuicInteger intKnobSpace(knobFrame.knobSpace);
QuicInteger intKnobId(knobFrame.id);
QuicInteger intKnobLen(knobFrame.len);
size_t knobFrameLen = intFrameType.getSize() + intKnobSpace.getSize() +
intKnobId.getSize() + intKnobLen.getSize() + intKnobLen.getValue();
if (packetSpaceCheck(spaceLeft, knobFrameLen)) {
builder.write(intFrameType);
builder.write(intKnobSpace);
builder.write(intKnobId);
builder.write(intKnobLen);
builder.insert(knobFrame.blob->clone());
builder.appendFrame(QuicSimpleFrame(knobFrame));
return knobFrameLen;
}
// no space left in packet
return size_t(0);
}
case QuicSimpleFrame::Type::AckFrequencyFrame: {
const auto ackFrequencyFrame = frame.asAckFrequencyFrame();
QuicInteger intFrameType(static_cast<uint64_t>(FrameType::ACK_FREQUENCY));
QuicInteger intSequenceNumber(ackFrequencyFrame->sequenceNumber);
QuicInteger intPacketTolerance(ackFrequencyFrame->packetTolerance);
QuicInteger intUpdateMaxAckDelay(ackFrequencyFrame->updateMaxAckDelay);
size_t ackFrequencyFrameLen = intFrameType.getSize() +
intSequenceNumber.getSize() + intPacketTolerance.getSize() +
intUpdateMaxAckDelay.getSize() + 1 /* ignoreOrder */;
if (packetSpaceCheck(spaceLeft, ackFrequencyFrameLen)) {
builder.write(intFrameType);
builder.write(intSequenceNumber);
builder.write(intPacketTolerance);
builder.write(intUpdateMaxAckDelay);
builder.writeBE(ackFrequencyFrame->ignoreOrder);
builder.appendFrame(QuicSimpleFrame(*ackFrequencyFrame));
return ackFrequencyFrameLen;
}
// no space left in packet
return size_t(0);
}
}
folly::assume_unreachable();
}
size_t writeFrame(QuicWriteFrame&& frame, PacketBuilderInterface& builder) {
using FrameTypeType = std::underlying_type<FrameType>::type;
uint64_t spaceLeft = builder.remainingSpaceInPkt();
switch (frame.type()) {
case QuicWriteFrame::Type::PaddingFrame: {
PaddingFrame& paddingFrame = *frame.asPaddingFrame();
QuicInteger intFrameType(static_cast<uint8_t>(FrameType::PADDING));
if (packetSpaceCheck(spaceLeft, intFrameType.getSize())) {
builder.write(intFrameType);
builder.appendFrame(std::move(paddingFrame));
return intFrameType.getSize();
}
return size_t(0);
}
case QuicWriteFrame::Type::RstStreamFrame: {
RstStreamFrame& rstStreamFrame = *frame.asRstStreamFrame();
QuicInteger intFrameType(static_cast<uint8_t>(FrameType::RST_STREAM));
QuicInteger streamId(rstStreamFrame.streamId);
QuicInteger offset(rstStreamFrame.offset);
QuicInteger errorCode(static_cast<uint64_t>(rstStreamFrame.errorCode));
size_t errorSize = errorCode.getSize();
auto rstStreamFrameSize = intFrameType.getSize() + errorSize +
streamId.getSize() + offset.getSize();
if (packetSpaceCheck(spaceLeft, rstStreamFrameSize)) {
builder.write(intFrameType);
builder.write(streamId);
builder.write(errorCode);
builder.write(offset);
builder.appendFrame(std::move(rstStreamFrame));
return rstStreamFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicWriteFrame::Type::MaxDataFrame: {
MaxDataFrame& maxDataFrame = *frame.asMaxDataFrame();
QuicInteger intFrameType(static_cast<uint8_t>(FrameType::MAX_DATA));
QuicInteger maximumData(maxDataFrame.maximumData);
auto frameSize = intFrameType.getSize() + maximumData.getSize();
if (packetSpaceCheck(spaceLeft, frameSize)) {
builder.write(intFrameType);
builder.write(maximumData);
builder.appendFrame(std::move(maxDataFrame));
return frameSize;
}
// no space left in packet
return size_t(0);
}
case QuicWriteFrame::Type::MaxStreamDataFrame: {
MaxStreamDataFrame& maxStreamDataFrame = *frame.asMaxStreamDataFrame();
QuicInteger intFrameType(
static_cast<uint8_t>(FrameType::MAX_STREAM_DATA));
QuicInteger streamId(maxStreamDataFrame.streamId);
QuicInteger maximumData(maxStreamDataFrame.maximumData);
auto maxStreamDataFrameSize =
intFrameType.getSize() + streamId.getSize() + maximumData.getSize();
if (packetSpaceCheck(spaceLeft, maxStreamDataFrameSize)) {
builder.write(intFrameType);
builder.write(streamId);
builder.write(maximumData);
builder.appendFrame(std::move(maxStreamDataFrame));
return maxStreamDataFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicWriteFrame::Type::DataBlockedFrame: {
DataBlockedFrame& blockedFrame = *frame.asDataBlockedFrame();
QuicInteger intFrameType(static_cast<uint8_t>(FrameType::DATA_BLOCKED));
QuicInteger dataLimit(blockedFrame.dataLimit);
auto blockedFrameSize = intFrameType.getSize() + dataLimit.getSize();
if (packetSpaceCheck(spaceLeft, blockedFrameSize)) {
builder.write(intFrameType);
builder.write(dataLimit);
builder.appendFrame(std::move(blockedFrame));
return blockedFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicWriteFrame::Type::StreamDataBlockedFrame: {
StreamDataBlockedFrame& streamBlockedFrame =
*frame.asStreamDataBlockedFrame();
QuicInteger intFrameType(
static_cast<uint8_t>(FrameType::STREAM_DATA_BLOCKED));
QuicInteger streamId(streamBlockedFrame.streamId);
QuicInteger dataLimit(streamBlockedFrame.dataLimit);
auto blockedFrameSize =
intFrameType.getSize() + streamId.getSize() + dataLimit.getSize();
if (packetSpaceCheck(spaceLeft, blockedFrameSize)) {
builder.write(intFrameType);
builder.write(streamId);
builder.write(dataLimit);
builder.appendFrame(std::move(streamBlockedFrame));
return blockedFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicWriteFrame::Type::StreamsBlockedFrame: {
StreamsBlockedFrame& streamsBlockedFrame = *frame.asStreamsBlockedFrame();
auto frameType = streamsBlockedFrame.isForBidirectionalStream()
? FrameType::STREAMS_BLOCKED_BIDI
: FrameType::STREAMS_BLOCKED_UNI;
QuicInteger intFrameType(static_cast<FrameTypeType>(frameType));
QuicInteger streamId(streamsBlockedFrame.streamLimit);
auto streamBlockedFrameSize = intFrameType.getSize() + streamId.getSize();
if (packetSpaceCheck(spaceLeft, streamBlockedFrameSize)) {
builder.write(intFrameType);
builder.write(streamId);
builder.appendFrame(std::move(streamsBlockedFrame));
return streamBlockedFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicWriteFrame::Type::ConnectionCloseFrame: {
ConnectionCloseFrame& connectionCloseFrame =
*frame.asConnectionCloseFrame();
// Need to distinguish between CONNECTION_CLOSE & CONNECTINO_CLOSE_APP_ERR
const TransportErrorCode* isTransportErrorCode =
connectionCloseFrame.errorCode.asTransportErrorCode();
const ApplicationErrorCode* isApplicationErrorCode =
connectionCloseFrame.errorCode.asApplicationErrorCode();
QuicInteger intFrameType(static_cast<uint8_t>(
isTransportErrorCode ? FrameType::CONNECTION_CLOSE
: FrameType::CONNECTION_CLOSE_APP_ERR));
QuicInteger reasonLength(connectionCloseFrame.reasonPhrase.size());
folly::Optional<QuicInteger> closingFrameType;
if (isTransportErrorCode) {
closingFrameType = QuicInteger(
static_cast<FrameTypeType>(connectionCloseFrame.closingFrameType));
}
QuicInteger errorCode(
isTransportErrorCode
? static_cast<uint64_t>(TransportErrorCode(*isTransportErrorCode))
: static_cast<uint64_t>(
ApplicationErrorCode(*isApplicationErrorCode)));
size_t errorSize = errorCode.getSize();
auto connCloseFrameSize = intFrameType.getSize() + errorSize +
(closingFrameType ? closingFrameType.value().getSize() : 0) +
reasonLength.getSize() + connectionCloseFrame.reasonPhrase.size();
if (packetSpaceCheck(spaceLeft, connCloseFrameSize)) {
builder.write(intFrameType);
builder.write(errorCode);
if (closingFrameType) {
builder.write(closingFrameType.value());
}
builder.write(reasonLength);
builder.push(
(const uint8_t*)connectionCloseFrame.reasonPhrase.data(),
connectionCloseFrame.reasonPhrase.size());
builder.appendFrame(std::move(connectionCloseFrame));
return connCloseFrameSize;
}
// no space left in packet
return size_t(0);
}
case QuicWriteFrame::Type::PingFrame: {
const PingFrame& pingFrame = *frame.asPingFrame();
QuicInteger intFrameType(static_cast<uint8_t>(FrameType::PING));
if (packetSpaceCheck(spaceLeft, intFrameType.getSize())) {
builder.write(intFrameType);
builder.appendFrame(pingFrame);
return intFrameType.getSize();
}
// no space left in packet
return size_t(0);
}
case QuicWriteFrame::Type::QuicSimpleFrame: {
return writeSimpleFrame(std::move(*frame.asQuicSimpleFrame()), builder);
}
case QuicWriteFrame::Type::DatagramFrame: {
const DatagramFrame& datagramFrame = *frame.asDatagramFrame();
QuicInteger frameTypeQuicInt(
static_cast<uint8_t>(FrameType::DATAGRAM_LEN));
QuicInteger datagramLenInt(datagramFrame.length);
auto datagramFrameLength = frameTypeQuicInt.getSize() +
datagramFrame.length + datagramLenInt.getSize();
if (packetSpaceCheck(spaceLeft, datagramFrameLength)) {
builder.write(frameTypeQuicInt);
builder.write(datagramLenInt);
builder.insert(std::move(datagramFrame.data), datagramFrame.length);
builder.appendFrame(datagramFrame);
return datagramFrameLength;
}
// no space left in packet
return size_t(0);
}
default: {
// TODO add support for: RETIRE_CONNECTION_ID and NEW_TOKEN frames
auto errorStr = folly::to<std::string>(
"Unknown / unsupported frame type received at ", __func__);
VLOG(2) << errorStr;
throw QuicTransportException(
errorStr, TransportErrorCode::FRAME_ENCODING_ERROR);
}
}
}
} // namespace quic
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