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#include "interconnect_tcp_session.h"
#include "interconnect_tcp_proxy.h"
#include <library/cpp/actors/core/probes.h>
#include <library/cpp/actors/util/datetime.h>
namespace NActors {
LWTRACE_USING(ACTORLIB_PROVIDER);
TInputSessionTCP::TInputSessionTCP(const TActorId& sessionId, TIntrusivePtr<NInterconnect::TStreamSocket> socket,
TIntrusivePtr<TReceiveContext> context, TInterconnectProxyCommon::TPtr common,
std::shared_ptr<IInterconnectMetrics> metrics, ui32 nodeId, ui64 lastConfirmed,
TDuration deadPeerTimeout, TSessionParams params)
: SessionId(sessionId)
, Socket(std::move(socket))
, Context(std::move(context))
, Common(std::move(common))
, NodeId(nodeId)
, Params(std::move(params))
, ConfirmedByInput(lastConfirmed)
, Metrics(std::move(metrics))
, DeadPeerTimeout(deadPeerTimeout)
{
Y_VERIFY(Context);
Y_VERIFY(Socket);
Y_VERIFY(SessionId);
AtomicSet(Context->PacketsReadFromSocket, 0);
Metrics->SetClockSkewMicrosec(0);
Context->UpdateState = EUpdateState::NONE;
// ensure that we do not spawn new session while the previous one is still alive
TAtomicBase sessions = AtomicIncrement(Context->NumInputSessions);
Y_VERIFY(sessions == 1, "sessions# %" PRIu64, ui64(sessions));
}
void TInputSessionTCP::Bootstrap() {
SetPrefix(Sprintf("InputSession %s [node %" PRIu32 "]", SelfId().ToString().data(), NodeId));
Become(&TThis::WorkingState, DeadPeerTimeout, new TEvCheckDeadPeer);
LOG_DEBUG_IC_SESSION("ICIS01", "InputSession created");
LastReceiveTimestamp = TActivationContext::Now();
ReceiveData();
}
void TInputSessionTCP::CloseInputSession() {
CloseInputSessionRequested = true;
ReceiveData();
}
void TInputSessionTCP::Handle(TEvPollerReady::TPtr ev) {
if (Context->ReadPending) {
Metrics->IncUsefulReadWakeups();
} else if (!ev->Cookie) {
Metrics->IncSpuriousReadWakeups();
}
Context->ReadPending = false;
ReceiveData();
if (Params.Encryption && Context->WriteBlockedByFullSendBuffer && !ev->Cookie) {
Send(SessionId, ev->Release().Release(), 0, 1);
}
}
void TInputSessionTCP::Handle(TEvPollerRegisterResult::TPtr ev) {
PollerToken = std::move(ev->Get()->PollerToken);
ReceiveData();
}
void TInputSessionTCP::HandleResumeReceiveData() {
ReceiveData();
}
void TInputSessionTCP::ReceiveData() {
TTimeLimit limit(GetMaxCyclesPerEvent());
ui64 numDataBytes = 0;
const size_t headerLen = Params.UseModernFrame ? sizeof(TTcpPacketHeader_v2) : sizeof(TTcpPacketHeader_v1);
LOG_DEBUG_IC_SESSION("ICIS02", "ReceiveData called");
for (int iteration = 0; Socket; ++iteration) {
if (iteration && limit.CheckExceeded()) {
// we have hit processing time limit for this message, send notification to resume processing a bit later
Send(SelfId(), new TEvResumeReceiveData);
break;
}
switch (State) {
case EState::HEADER:
if (IncomingData.GetSize() < headerLen) {
break;
} else {
ProcessHeader(headerLen);
}
continue;
case EState::PAYLOAD:
if (!IncomingData) {
break;
} else {
ProcessPayload(numDataBytes);
}
continue;
}
// if we have reached this point, it means that we do not have enough data in read buffer; try to obtain some
if (!ReadMore()) {
// we have no data from socket, so we have some free time to spend -- preallocate buffers using this time
PreallocateBuffers();
break;
}
}
// calculate ping time
auto it = std::min_element(PingQ.begin(), PingQ.end());
const TDuration ping = it != PingQ.end() ? *it : TDuration::Zero();
// send update to main session actor if something valuable has changed
if (!UpdateFromInputSession) {
UpdateFromInputSession = MakeHolder<TEvUpdateFromInputSession>(ConfirmedByInput, numDataBytes, ping);
} else {
Y_VERIFY(ConfirmedByInput >= UpdateFromInputSession->ConfirmedByInput);
UpdateFromInputSession->ConfirmedByInput = ConfirmedByInput;
UpdateFromInputSession->NumDataBytes += numDataBytes;
UpdateFromInputSession->Ping = Min(UpdateFromInputSession->Ping, ping);
}
for (;;) {
EUpdateState state = Context->UpdateState;
EUpdateState next;
// calculate next state
switch (state) {
case EUpdateState::NONE:
case EUpdateState::CONFIRMING:
// we have no inflight messages to session actor, we will issue one a bit later
next = EUpdateState::INFLIGHT;
break;
case EUpdateState::INFLIGHT:
case EUpdateState::INFLIGHT_AND_PENDING:
// we already have inflight message, so we will keep pending message and session actor will issue
// TEvConfirmUpdate to kick processing
next = EUpdateState::INFLIGHT_AND_PENDING;
break;
}
if (Context->UpdateState.compare_exchange_weak(state, next)) {
switch (next) {
case EUpdateState::INFLIGHT:
Send(SessionId, UpdateFromInputSession.Release());
break;
case EUpdateState::INFLIGHT_AND_PENDING:
Y_VERIFY(UpdateFromInputSession);
break;
default:
Y_FAIL("unexpected state");
}
break;
}
}
}
void TInputSessionTCP::ProcessHeader(size_t headerLen) {
const bool success = IncomingData.ExtractFrontPlain(Header.Data, headerLen);
Y_VERIFY(success);
if (Params.UseModernFrame) {
PayloadSize = Header.v2.PayloadLength;
HeaderSerial = Header.v2.Serial;
HeaderConfirm = Header.v2.Confirm;
if (!Params.Encryption) {
ChecksumExpected = std::exchange(Header.v2.Checksum, 0);
Checksum = Crc32cExtendMSanCompatible(0, &Header.v2, sizeof(Header.v2)); // start calculating checksum now
if (!PayloadSize && Checksum != ChecksumExpected) {
LOG_ERROR_IC_SESSION("ICIS10", "payload checksum error");
return ReestablishConnection(TDisconnectReason::ChecksumError());
}
}
} else if (!Header.v1.Check()) {
LOG_ERROR_IC_SESSION("ICIS03", "header checksum error");
return ReestablishConnection(TDisconnectReason::ChecksumError());
} else {
PayloadSize = Header.v1.DataSize;
HeaderSerial = Header.v1.Serial;
HeaderConfirm = Header.v1.Confirm;
ChecksumExpected = Header.v1.PayloadCRC32;
Checksum = 0;
}
if (PayloadSize >= 65536) {
LOG_CRIT_IC_SESSION("ICIS07", "payload is way too big");
return DestroySession(TDisconnectReason::FormatError());
}
if (ConfirmedByInput < HeaderConfirm) {
ConfirmedByInput = HeaderConfirm;
if (AtomicGet(Context->ControlPacketId) <= HeaderConfirm && !NewPingProtocol) {
ui64 sendTime = AtomicGet(Context->ControlPacketSendTimer);
TDuration duration = CyclesToDuration(GetCycleCountFast() - sendTime);
const auto durationUs = duration.MicroSeconds();
Metrics->UpdatePingTimeHistogram(durationUs);
PingQ.push_back(duration);
if (PingQ.size() > 16) {
PingQ.pop_front();
}
AtomicSet(Context->ControlPacketId, 0ULL);
}
}
if (PayloadSize) {
const ui64 expected = Context->GetLastProcessedPacketSerial() + 1;
if (HeaderSerial == 0 || HeaderSerial > expected) {
LOG_CRIT_IC_SESSION("ICIS06", "packet serial %" PRIu64 ", but %" PRIu64 " expected", HeaderSerial, expected);
return DestroySession(TDisconnectReason::FormatError());
}
IgnorePayload = HeaderSerial != expected;
State = EState::PAYLOAD;
} else if (HeaderSerial & TTcpPacketBuf::PingRequestMask) {
Send(SessionId, new TEvProcessPingRequest(HeaderSerial & ~TTcpPacketBuf::PingRequestMask));
} else if (HeaderSerial & TTcpPacketBuf::PingResponseMask) {
const ui64 sent = HeaderSerial & ~TTcpPacketBuf::PingResponseMask;
const ui64 received = GetCycleCountFast();
HandlePingResponse(CyclesToDuration(received - sent));
} else if (HeaderSerial & TTcpPacketBuf::ClockMask) {
HandleClock(TInstant::MicroSeconds(HeaderSerial & ~TTcpPacketBuf::ClockMask));
}
}
void TInputSessionTCP::ProcessPayload(ui64& numDataBytes) {
const size_t numBytes = Min(PayloadSize, IncomingData.GetSize());
IncomingData.ExtractFront(numBytes, &Payload);
numDataBytes += numBytes;
PayloadSize -= numBytes;
if (PayloadSize) {
return; // there is still some data to receive in the Payload rope
}
State = EState::HEADER; // we'll continue with header next time
if (!Params.UseModernFrame || !Params.Encryption) { // see if we are checksumming packet body
for (const auto&& [data, size] : Payload) {
Checksum = Crc32cExtendMSanCompatible(Checksum, data, size);
}
if (Checksum != ChecksumExpected) { // validate payload checksum
LOG_ERROR_IC_SESSION("ICIS04", "payload checksum error");
return ReestablishConnection(TDisconnectReason::ChecksumError());
}
}
if (Y_UNLIKELY(IgnorePayload)) {
return;
}
if (!Context->AdvanceLastProcessedPacketSerial()) {
return DestroySession(TDisconnectReason::NewSession());
}
while (Payload && Socket) {
// extract channel part header from the payload stream
TChannelPart part;
if (!Payload.ExtractFrontPlain(&part, sizeof(part))) {
LOG_CRIT_IC_SESSION("ICIS14", "missing TChannelPart header in payload");
return DestroySession(TDisconnectReason::FormatError());
}
if (!part.Size) { // bogus frame
continue;
} else if (Payload.GetSize() < part.Size) {
LOG_CRIT_IC_SESSION("ICIS08", "payload format error ChannelPart# %s", part.ToString().data());
return DestroySession(TDisconnectReason::FormatError());
}
const ui16 channel = part.Channel & ~TChannelPart::LastPartFlag;
TRope *eventData = channel < Context->ChannelArray.size()
? &Context->ChannelArray[channel]
: &Context->ChannelMap[channel];
Metrics->AddInputChannelsIncomingTraffic(channel, sizeof(part) + part.Size);
TEventDescr descr;
if (~part.Channel & TChannelPart::LastPartFlag) {
Payload.ExtractFront(part.Size, eventData);
} else if (part.Size != sizeof(descr)) {
LOG_CRIT_IC_SESSION("ICIS11", "incorrect last part of an event");
return DestroySession(TDisconnectReason::FormatError());
} else if (Payload.ExtractFrontPlain(&descr, sizeof(descr))) {
Metrics->IncInputChannelsIncomingEvents(channel);
ProcessEvent(*eventData, descr);
*eventData = TRope();
} else {
Y_FAIL();
}
}
}
void TInputSessionTCP::ProcessEvent(TRope& data, TEventDescr& descr) {
if (!Params.UseModernFrame || descr.Checksum) {
ui32 checksum = 0;
for (const auto&& [data, size] : data) {
checksum = Crc32cExtendMSanCompatible(checksum, data, size);
}
if (checksum != descr.Checksum) {
LOG_CRIT_IC_SESSION("ICIS05", "event checksum error");
return ReestablishConnection(TDisconnectReason::ChecksumError());
}
}
auto ev = std::make_unique<IEventHandle>(SessionId,
descr.Type,
descr.Flags & ~IEventHandle::FlagExtendedFormat,
descr.Recipient,
descr.Sender,
MakeIntrusive<TEventSerializedData>(std::move(data), bool(descr.Flags & IEventHandle::FlagExtendedFormat)),
descr.Cookie,
Params.PeerScopeId,
NWilson::TTraceId(descr.TraceId));
if (Common->EventFilter && !Common->EventFilter->CheckIncomingEvent(*ev, Common->LocalScopeId)) {
LOG_CRIT_IC_SESSION("ICIC03", "Event dropped due to scope error LocalScopeId# %s PeerScopeId# %s Type# 0x%08" PRIx32,
ScopeIdToString(Common->LocalScopeId).data(), ScopeIdToString(Params.PeerScopeId).data(), descr.Type);
ev.reset();
}
if (ev) {
TActivationContext::Send(ev.release());
}
}
void TInputSessionTCP::HandleConfirmUpdate() {
for (;;) {
switch (EUpdateState state = Context->UpdateState) {
case EUpdateState::NONE:
case EUpdateState::INFLIGHT:
case EUpdateState::INFLIGHT_AND_PENDING:
// here we may have a race
return;
case EUpdateState::CONFIRMING:
Y_VERIFY(UpdateFromInputSession);
if (Context->UpdateState.compare_exchange_weak(state, EUpdateState::INFLIGHT)) {
Send(SessionId, UpdateFromInputSession.Release());
return;
}
}
}
}
bool TInputSessionTCP::ReadMore() {
PreallocateBuffers();
TStackVec<TIoVec, NumPreallocatedBuffers> buffs;
for (const auto& item : Buffers) {
TIoVec iov{item->GetBuffer(), item->GetCapacity()};
buffs.push_back(iov);
if (Params.Encryption) {
break; // do not put more than one buffer in queue to prevent using ReadV
}
}
const struct iovec* iovec = reinterpret_cast<const struct iovec*>(buffs.data());
int iovcnt = buffs.size();
ssize_t recvres = 0;
TString err;
LWPROBE_IF_TOO_LONG(SlowICReadFromSocket, ms) {
do {
#ifndef _win_
recvres = iovcnt == 1 ? Socket->Recv(iovec->iov_base, iovec->iov_len, &err) : Socket->ReadV(iovec, iovcnt);
#else
recvres = Socket->Recv(iovec[0].iov_base, iovec[0].iov_len, &err);
#endif
Metrics->IncRecvSyscalls();
} while (recvres == -EINTR);
}
LOG_DEBUG_IC_SESSION("ICIS12", "ReadMore recvres# %zd iovcnt# %d err# %s", recvres, iovcnt, err.data());
if (recvres <= 0 || CloseInputSessionRequested) {
if ((-recvres != EAGAIN && -recvres != EWOULDBLOCK) || CloseInputSessionRequested) {
TString message = CloseInputSessionRequested ? "connection closed by debug command"
: recvres == 0 ? "connection closed by peer"
: err ? err
: Sprintf("socket: %s", strerror(-recvres));
LOG_NOTICE_NET(NodeId, "%s", message.data());
ReestablishConnection(CloseInputSessionRequested ? TDisconnectReason::Debug() :
recvres == 0 ? TDisconnectReason::EndOfStream() : TDisconnectReason::FromErrno(-recvres));
} else if (PollerToken && !std::exchange(Context->ReadPending, true)) {
if (Params.Encryption) {
auto *secure = static_cast<NInterconnect::TSecureSocket*>(Socket.Get());
const bool wantRead = secure->WantRead(), wantWrite = secure->WantWrite();
Y_VERIFY_DEBUG(wantRead || wantWrite);
PollerToken->Request(wantRead, wantWrite);
} else {
PollerToken->Request(true, false);
}
}
return false;
}
Y_VERIFY(recvres > 0);
Metrics->AddTotalBytesRead(recvres);
TDeque<TIntrusivePtr<TRopeAlignedBuffer>>::iterator it;
for (it = Buffers.begin(); recvres; ++it) {
Y_VERIFY(it != Buffers.end());
const size_t bytesFromFrontBuffer = Min<size_t>(recvres, (*it)->GetCapacity());
(*it)->AdjustSize(bytesFromFrontBuffer);
IncomingData.Insert(IncomingData.End(), TRope(std::move(*it)));
recvres -= bytesFromFrontBuffer;
}
Buffers.erase(Buffers.begin(), it);
LastReceiveTimestamp = TActivationContext::Now();
return true;
}
void TInputSessionTCP::PreallocateBuffers() {
// ensure that we have exactly "numBuffers" in queue
LWPROBE_IF_TOO_LONG(SlowICReadLoopAdjustSize, ms) {
const ui32 target = Params.Encryption ? 1 : NumPreallocatedBuffers;
while (Buffers.size() < target) {
Buffers.emplace_back(TRopeAlignedBuffer::Allocate(sizeof(TTcpPacketBuf)));
}
}
}
void TInputSessionTCP::ReestablishConnection(TDisconnectReason reason) {
LOG_DEBUG_IC_SESSION("ICIS09", "ReestablishConnection, reason# %s", reason.ToString().data());
AtomicDecrement(Context->NumInputSessions);
Send(SessionId, new TEvSocketDisconnect(std::move(reason)));
PassAway();
Socket.Reset();
}
void TInputSessionTCP::DestroySession(TDisconnectReason reason) {
LOG_DEBUG_IC_SESSION("ICIS13", "DestroySession, reason# %s", reason.ToString().data());
AtomicDecrement(Context->NumInputSessions);
Send(SessionId, TInterconnectSessionTCP::NewEvTerminate(std::move(reason)));
PassAway();
Socket.Reset();
}
void TInputSessionTCP::PassAway() {
Metrics->SetClockSkewMicrosec(0);
TActorBootstrapped::PassAway();
}
void TInputSessionTCP::HandleCheckDeadPeer() {
const TInstant now = TActivationContext::Now();
if (now >= LastReceiveTimestamp + DeadPeerTimeout) {
ReceiveData();
if (Socket && now >= LastReceiveTimestamp + DeadPeerTimeout) {
// nothing has changed, terminate session
DestroySession(TDisconnectReason::DeadPeer());
}
}
Schedule(LastReceiveTimestamp + DeadPeerTimeout - now, new TEvCheckDeadPeer);
}
void TInputSessionTCP::HandlePingResponse(TDuration passed) {
PingQ.push_back(passed);
if (PingQ.size() > 16) {
PingQ.pop_front();
}
const TDuration ping = *std::min_element(PingQ.begin(), PingQ.end());
const auto pingUs = ping.MicroSeconds();
Context->PingRTT_us = pingUs;
NewPingProtocol = true;
Metrics->UpdatePingTimeHistogram(pingUs);
}
void TInputSessionTCP::HandleClock(TInstant clock) {
const TInstant here = TInstant::Now(); // wall clock
const TInstant remote = clock + TDuration::MicroSeconds(Context->PingRTT_us / 2);
i64 skew = remote.MicroSeconds() - here.MicroSeconds();
SkewQ.push_back(skew);
if (SkewQ.size() > 16) {
SkewQ.pop_front();
}
i64 clockSkew = SkewQ.front();
for (i64 skew : SkewQ) {
if (abs(skew) < abs(clockSkew)) {
clockSkew = skew;
}
}
Context->ClockSkew_us = clockSkew;
Metrics->SetClockSkewMicrosec(clockSkew);
}
}
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