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Custom variant type for packetheader

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Summary:
Make a custom variant type for PacketHeader. By not relying on boost::variant
this reduces the code size of the implementation.

This uses a combination of a union type as well as a enum type to emulate a variant

Reviewed By: yangchi

Differential Revision: D17187589

fbshipit-source-id: 00c2b9b8dd3f3e73af766d84888b13b9d867165a
This commit is contained in:
Subodh Iyengar
2019-09-19 17:30:13 -07:00
committed by Facebook Github Bot
parent c8da36d755
commit 04baa15a04
39 changed files with 593 additions and 641 deletions
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33
quic/logging/QLogger.cpp
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@@ -23,17 +23,16 @@ std::unique_ptr<QLogPacketEvent> QLogger::createPacketEvent(
std::chrono::steady_clock::now() - refTimePoint);
event->packetSize = packetSize;
event->eventType = QLogEventType::PacketReceived;
event->packetType = folly::variant_match(
regularPacket.header,
[](const LongHeader& header) { return toString(header.getHeaderType()); },
[](const ShortHeader& /* unused*/) {
return kShortHeaderPacketType.toString();
});
const ShortHeader* shortHeader = regularPacket.header.asShort();
if (shortHeader) {
event->packetType = kShortHeaderPacketType.toString();
} else {
event->packetType =
toString(regularPacket.header.asLong()->getHeaderType());
}
if (event->packetType != toString(LongHeader::Types::Retry)) {
// A Retry packet does not include a packet number.
event->packetNum = folly::variant_match(
regularPacket.header,
[](const auto& h) { return h.getPacketSequenceNum(); });
event->packetNum = regularPacket.header.getPacketSequenceNum();
}
uint64_t numPaddingFrames = 0;
@@ -149,17 +148,15 @@ std::unique_ptr<QLogPacketEvent> QLogger::createPacketEvent(
auto event = std::make_unique<QLogPacketEvent>();
event->refTime = std::chrono::duration_cast<std::chrono::microseconds>(
std::chrono::steady_clock::now() - refTimePoint);
event->packetNum = folly::variant_match(
writePacket.header,
[](const auto& h) { return h.getPacketSequenceNum(); });
event->packetNum = writePacket.header.getPacketSequenceNum();
event->packetSize = packetSize;
event->eventType = QLogEventType::PacketSent;
event->packetType = folly::variant_match(
writePacket.header,
[](const LongHeader& header) { return toString(header.getHeaderType()); },
[](const ShortHeader& /* unused*/) {
return kShortHeaderPacketType.toString();
});
const ShortHeader* shortHeader = writePacket.header.asShort();
if (shortHeader) {
event->packetType = kShortHeaderPacketType.toString();
} else {
event->packetType = toString(writePacket.header.asLong()->getHeaderType());
}
uint64_t numPaddingFrames = 0;
// looping through the packet to store logs created from frames in the packet