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ReliableMessageMgr.cpp
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ReliableMessageMgr.cpp
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/*
* Copyright (c) 2020-2021 Project CHIP Authors
* All rights reserved.
*
* 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.
*/
/**
* @file
* This file implements the CHIP reliable message protocol.
*
*/
#include <inttypes.h>
#include <messaging/ReliableMessageMgr.h>
#include <lib/support/BitFlags.h>
#include <lib/support/CHIPFaultInjection.h>
#include <lib/support/CodeUtils.h>
#include <lib/support/logging/CHIPLogging.h>
#include <messaging/ErrorCategory.h>
#include <messaging/ExchangeMessageDispatch.h>
#include <messaging/ExchangeMgr.h>
#include <messaging/Flags.h>
#include <messaging/ReliableMessageContext.h>
namespace chip {
namespace Messaging {
ReliableMessageMgr::RetransTableEntry::RetransTableEntry(ReliableMessageContext * rc) :
ec(*rc->GetExchangeContext()), retainedBuf(EncryptedPacketBufferHandle()), nextRetransTimeTick(0), sendCount(0)
{
ec->SetMessageNotAcked(true);
}
ReliableMessageMgr::RetransTableEntry::~RetransTableEntry()
{
ec->SetMessageNotAcked(false);
}
ReliableMessageMgr::ReliableMessageMgr(BitMapObjectPool<ExchangeContext, CHIP_CONFIG_MAX_EXCHANGE_CONTEXTS> & contextPool) :
mContextPool(contextPool), mSystemLayer(nullptr), mCurrentTimerExpiry(0),
mTimerIntervalShift(CHIP_CONFIG_RMP_TIMER_DEFAULT_PERIOD_SHIFT)
{}
ReliableMessageMgr::~ReliableMessageMgr() {}
void ReliableMessageMgr::Init(chip::System::Layer * systemLayer, SessionManager * sessionManager)
{
mSystemLayer = systemLayer;
mTimeStampBase = System::SystemClock().GetMonotonicTimestamp();
mCurrentTimerExpiry = System::Clock::kZero;
}
void ReliableMessageMgr::Shutdown()
{
StopTimer();
// Clear the retransmit table
mRetransTable.ForEachActiveObject([&](auto * entry) {
ClearRetransTable(*entry);
return true;
});
mSystemLayer = nullptr;
}
uint64_t ReliableMessageMgr::GetTickCounterFromTimePeriod(System::Clock::Milliseconds64 period)
{
return (period.count() >> mTimerIntervalShift);
}
uint64_t ReliableMessageMgr::GetTickCounterFromTimeDelta(System::Clock::Timestamp newTime)
{
return GetTickCounterFromTimePeriod(newTime - mTimeStampBase);
}
#if defined(RMP_TICKLESS_DEBUG)
void ReliableMessageMgr::TicklessDebugDumpRetransTable(const char * log)
{
ChipLogDetail(ExchangeManager, log);
mRetransTable.ForEachActiveObject([&](auto * entry) {
ChipLogDetail(ExchangeManager,
"EC:" ChipLogFormatExchange " MessageCounter:" ChipLogFormatMessageCounter " NextRetransTimeCtr:%04" PRIX16,
ChipLogValueExchange(&entry->ec.Get()), entry->retainedBuf.GetMessageCounter(), entry->nextRetransTimeTick);
return true;
});
}
#else
void ReliableMessageMgr::TicklessDebugDumpRetransTable(const char * log)
{
return;
}
#endif // RMP_TICKLESS_DEBUG
void ReliableMessageMgr::ExecuteActions()
{
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::ExecuteActions");
#endif
ExecuteForAllContext([](ReliableMessageContext * rc) {
if (rc->IsAckPending())
{
if (0 == rc->mNextAckTimeTick)
{
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::ExecuteActions sending ACK");
#endif
// Send the Ack in a SecureChannel::StandaloneAck message
rc->SendStandaloneAckMessage();
}
}
});
TicklessDebugDumpRetransTable("ReliableMessageMgr::ExecuteActions Dumping mRetransTable entries before processing");
// Retransmit / cancel anything in the retrans table whose retrans timeout
// has expired
mRetransTable.ForEachActiveObject([&](auto * entry) {
CHIP_ERROR err = CHIP_NO_ERROR;
if (entry->nextRetransTimeTick != 0)
return true;
if (entry->retainedBuf.IsNull())
{
// We generally try to prevent entries with a null buffer being in a table, but it could happen
// if the message dispatch (which is supposed to fill in the buffer) fails to do so _and_ returns
// success (so its caller doesn't clear out the bogus table entry).
//
// If that were to happen, we would crash in the code below. Guard against it, just in case.
ClearRetransTable(*entry);
return true;
}
uint8_t sendCount = entry->sendCount;
uint32_t messageCounter = entry->retainedBuf.GetMessageCounter();
if (sendCount == CHIP_CONFIG_RMP_DEFAULT_MAX_RETRANS)
{
err = CHIP_ERROR_MESSAGE_NOT_ACKNOWLEDGED;
ChipLogError(ExchangeManager,
"Failed to Send CHIP MessageCounter:" ChipLogFormatMessageCounter " on exchange " ChipLogFormatExchange
" sendCount: %" PRIu8 " max retries: %d",
messageCounter, ChipLogValueExchange(&entry->ec.Get()), sendCount, CHIP_CONFIG_RMP_DEFAULT_MAX_RETRANS);
// Remove from Table
ClearRetransTable(*entry);
}
// Resend from Table (if the operation fails, the entry is cleared)
if (err == CHIP_NO_ERROR)
err = SendFromRetransTable(entry);
if (err == CHIP_NO_ERROR)
{
// If the retransmission was successful, update the passive timer
entry->nextRetransTimeTick = static_cast<uint16_t>(entry->ec->GetActiveRetransmitTimeoutTick());
#if !defined(NDEBUG)
ChipLogDetail(ExchangeManager,
"Retransmitted MessageCounter:" ChipLogFormatMessageCounter " on exchange " ChipLogFormatExchange
" Send Cnt %d",
messageCounter, ChipLogValueExchange(&entry->ec.Get()), entry->sendCount);
#endif
}
return true;
});
TicklessDebugDumpRetransTable("ReliableMessageMgr::ExecuteActions Dumping mRetransTable entries after processing");
}
static void TickProceed(uint16_t & time, uint64_t ticks)
{
if (time >= ticks)
{
time = static_cast<uint16_t>(time - ticks);
}
else
{
time = 0;
}
}
void ReliableMessageMgr::ExpireTicks()
{
System::Clock::Timestamp now = System::SystemClock().GetMonotonicTimestamp();
// Number of full ticks elapsed since last timer processing. We always round down
// to the previous tick. If we are between tick boundaries, the extra time since the
// last virtual tick is not accounted for here (it will be accounted for when resetting
// the ReliableMessageProtocol timer)
uint64_t deltaTicks = GetTickCounterFromTimeDelta(now);
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::ExpireTicks at %" PRIu64 ", %" PRIu64 ", %" PRIu64, now, mTimeStampBase,
deltaTicks);
#endif
ExecuteForAllContext([deltaTicks](ReliableMessageContext * rc) {
if (rc->IsAckPending())
{
// Decrement counter of Ack timestamp by the elapsed timer ticks
TickProceed(rc->mNextAckTimeTick, deltaTicks);
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::ExpireTicks set mNextAckTimeTick to %u", rc->mNextAckTimeTick);
#endif
}
});
mRetransTable.ForEachActiveObject([&](auto * entry) {
// Decrement Retransmit timeout by elapsed timeticks
TickProceed(entry->nextRetransTimeTick, deltaTicks);
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::ExpireTicks set nextRetransTimeTick to %u", entry->nextRetransTimeTick);
#endif
return true;
});
// Re-Adjust the base time stamp to the most recent tick boundary
mTimeStampBase += System::Clock::Milliseconds32(deltaTicks << mTimerIntervalShift);
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::ExpireTicks mTimeStampBase to %" PRIu64, mTimeStampBase.count());
#endif
}
void ReliableMessageMgr::Timeout(System::Layer * aSystemLayer, void * aAppState)
{
ReliableMessageMgr * manager = reinterpret_cast<ReliableMessageMgr *>(aAppState);
VerifyOrDie((aSystemLayer != nullptr) && (manager != nullptr));
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::Timeout\n");
#endif
// Make sure all tick counts are sync'd to the current time
manager->ExpireTicks();
// Execute any actions that are due this tick
manager->ExecuteActions();
// Calculate next physical wakeup
manager->StartTimer();
}
CHIP_ERROR ReliableMessageMgr::AddToRetransTable(ReliableMessageContext * rc, RetransTableEntry ** rEntry)
{
VerifyOrDie(!rc->IsMessageNotAcked());
// Expire any virtual ticks that have expired so all wakeup sources reflect the current time
ExpireTicks();
*rEntry = mRetransTable.CreateObject(rc);
if (*rEntry == nullptr)
{
ChipLogError(ExchangeManager, "mRetransTable Already Full");
return CHIP_ERROR_RETRANS_TABLE_FULL;
}
return CHIP_NO_ERROR;
}
void ReliableMessageMgr::StartRetransmision(RetransTableEntry * entry)
{
entry->nextRetransTimeTick = static_cast<uint16_t>(entry->ec->GetIdleRetransmitTimeoutTick() +
GetTickCounterFromTimeDelta(System::SystemClock().GetMonotonicTimestamp()));
// Check if the timer needs to be started and start it.
StartTimer();
}
void ReliableMessageMgr::PauseRetransmision(ReliableMessageContext * rc, uint32_t PauseTimeMillis)
{
mRetransTable.ForEachActiveObject([&](auto * entry) {
if (entry->ec->GetReliableMessageContext() == rc)
{
entry->nextRetransTimeTick =
static_cast<uint16_t>(entry->nextRetransTimeTick + (PauseTimeMillis >> mTimerIntervalShift));
return false;
}
return true;
});
}
void ReliableMessageMgr::ResumeRetransmision(ReliableMessageContext * rc)
{
mRetransTable.ForEachActiveObject([&](auto * entry) {
if (entry->ec->GetReliableMessageContext() == rc)
{
entry->nextRetransTimeTick = 0;
return false;
}
return true;
});
}
bool ReliableMessageMgr::CheckAndRemRetransTable(ReliableMessageContext * rc, uint32_t ackMessageCounter)
{
bool removed = false;
mRetransTable.ForEachActiveObject([&](auto * entry) {
if (entry->ec->GetReliableMessageContext() == rc && entry->retainedBuf.GetMessageCounter() == ackMessageCounter)
{
// Clear the entry from the retransmision table.
ClearRetransTable(*entry);
#if !defined(NDEBUG)
ChipLogDetail(ExchangeManager,
"Rxd Ack; Removing MessageCounter:" ChipLogFormatMessageCounter
" from Retrans Table on exchange " ChipLogFormatExchange,
ackMessageCounter, ChipLogValueExchange(rc->GetExchangeContext()));
#endif
removed = true;
return false;
}
return true;
});
return removed;
}
CHIP_ERROR ReliableMessageMgr::SendFromRetransTable(RetransTableEntry * entry)
{
const ExchangeMessageDispatch * dispatcher = entry->ec->GetMessageDispatch();
if (dispatcher == nullptr || !entry->ec->HasSessionHandle())
{
// Using same error message for all errors to reduce code size.
ChipLogError(ExchangeManager,
"Crit-err %" CHIP_ERROR_FORMAT " when sending CHIP MessageCounter:" ChipLogFormatMessageCounter
" on exchange " ChipLogFormatExchange ", send tries: %d",
CHIP_ERROR_INCORRECT_STATE.Format(), entry->retainedBuf.GetMessageCounter(),
ChipLogValueExchange(&entry->ec.Get()), entry->sendCount);
ClearRetransTable(*entry);
return CHIP_ERROR_INCORRECT_STATE;
}
CHIP_ERROR err = dispatcher->SendPreparedMessage(entry->ec->GetSessionHandle(), entry->retainedBuf);
if (err == CHIP_NO_ERROR)
{
const ExchangeManager * exchangeMgr = entry->ec->GetExchangeMgr();
// TODO: investigate why in ReliableMessageMgr::CheckResendApplicationMessageWithPeerExchange unit test released exchange
// context with mExchangeMgr==nullptr is used.
if (exchangeMgr)
{
// After the first failure notify session manager to refresh device data
if (entry->sendCount == 0)
{
exchangeMgr->GetSessionManager()->RefreshSessionOperationalData(entry->ec->GetSessionHandle());
}
}
// Update the counters
entry->sendCount++;
}
else
{
// Remove from table
// Using same error message for all errors to reduce code size.
ChipLogError(ExchangeManager,
"Crit-err %" CHIP_ERROR_FORMAT " when sending CHIP MessageCounter:" ChipLogFormatMessageCounter
" on exchange " ChipLogFormatExchange ", send tries: %d",
err.Format(), entry->retainedBuf.GetMessageCounter(), ChipLogValueExchange(&entry->ec.Get()),
entry->sendCount);
ClearRetransTable(*entry);
}
return err;
}
void ReliableMessageMgr::ClearRetransTable(ReliableMessageContext * rc)
{
RetransTableEntry * result = nullptr;
mRetransTable.ForEachActiveObject([&](auto * entry) {
if (entry->ec->GetReliableMessageContext() == rc)
{
result = entry;
return false;
}
return true;
});
if (result != nullptr)
{
ClearRetransTable(*result);
}
}
void ReliableMessageMgr::ClearRetransTable(RetransTableEntry & entry)
{
mRetransTable.ReleaseObject(&entry);
// Expire any virtual ticks that have expired so all wakeup sources reflect the current time
ExpireTicks();
StartTimer();
}
void ReliableMessageMgr::FailRetransTableEntries(ReliableMessageContext * rc, CHIP_ERROR err)
{
ClearRetransTable(rc);
}
void ReliableMessageMgr::StartTimer()
{
CHIP_ERROR res = CHIP_NO_ERROR;
uint64_t nextWakeTimeTick = UINT64_MAX;
bool foundWake = false;
// When do we need to next wake up to send an ACK?
ExecuteForAllContext([&nextWakeTimeTick, &foundWake](ReliableMessageContext * rc) {
if (rc->IsAckPending() && rc->mNextAckTimeTick < nextWakeTimeTick)
{
nextWakeTimeTick = rc->mNextAckTimeTick;
foundWake = true;
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::StartTimer next ACK time %" PRIu64, nextWakeTimeTick);
#endif
}
});
mRetransTable.ForEachActiveObject([&](auto * entry) {
// When do we need to next wake up for ReliableMessageProtocol retransmit?
if (entry->nextRetransTimeTick < nextWakeTimeTick)
{
nextWakeTimeTick = entry->nextRetransTimeTick;
foundWake = true;
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::StartTimer RetransTime %" PRIu64, nextWakeTimeTick);
#endif
}
return true;
});
if (foundWake)
{
// Set timer for next tick boundary - subtract the elapsed time from the current tick
System::Clock::Timestamp timerExpiry =
System::Clock::Milliseconds32(nextWakeTimeTick << mTimerIntervalShift) + mTimeStampBase;
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::StartTimer wake at %" PRIu64 " ms (%" PRIu64 " %" PRIu64 ")",
timerExpiry, nextWakeTimeTick, mTimeStampBase);
#endif
if (timerExpiry != mCurrentTimerExpiry)
{
// If the tick boundary has expired in the past (delayed processing of event due to other system activity),
// expire the timer immediately
System::Clock::Timestamp now = System::SystemClock().GetMonotonicTimestamp();
System::Clock::Timeout timerArmValue = (timerExpiry > now) ? timerExpiry - now : System::Clock::kZero;
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::StartTimer set timer for %" PRIu32 " ms",
System::Clock::Milliseconds32(timerArmValue).count());
#endif
StopTimer();
res = mSystemLayer->StartTimer(timerArmValue, Timeout, this);
VerifyOrDieWithMsg(res == CHIP_NO_ERROR, ExchangeManager,
"Cannot start ReliableMessageMgr::Timeout %" CHIP_ERROR_FORMAT, res.Format());
mCurrentTimerExpiry = timerExpiry;
#if defined(RMP_TICKLESS_DEBUG)
}
else
{
ChipLogDetail(ExchangeManager, "ReliableMessageMgr::StartTimer timer already set for %" PRIu64, timerExpiry);
#endif
}
}
else
{
#if defined(RMP_TICKLESS_DEBUG)
ChipLogDetail(ExchangeManager, "Not setting ReliableMessageProtocol timeout at %" PRIu64,
System::SystemClock().GetMonotonicTimestamp().count());
#endif
StopTimer();
}
TicklessDebugDumpRetransTable("ReliableMessageMgr::StartTimer Dumping mRetransTable entries after setting wakeup times");
}
void ReliableMessageMgr::StopTimer()
{
mSystemLayer->CancelTimer(Timeout, this);
}
#if CHIP_CONFIG_TEST
int ReliableMessageMgr::TestGetCountRetransTable()
{
int count = 0;
mRetransTable.ForEachActiveObject([&](auto * entry) {
count++;
return true;
});
return count;
}
#endif // CHIP_CONFIG_TEST
} // namespace Messaging
} // namespace chip