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/**
*
* Copyright (c) 2021 Project CHIP Authors
* Copyright (c) 2015-2017 Nest Labs, Inc.
*
* 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.
*/
#include <access/AccessControl.h>
#include <access/RequestPath.h>
#include <access/SubjectDescriptor.h>
#include <app/EventManagement.h>
#include <app/InteractionModelEngine.h>
#include <app/RequiredPrivilege.h>
#include <assert.h>
#include <inttypes.h>
#include <lib/core/TLVUtilities.h>
#include <lib/support/CodeUtils.h>
#include <lib/support/logging/CHIPLogging.h>
using namespace chip::TLV;
namespace chip {
namespace app {
static EventManagement sInstance;
/**
* @brief
* A TLVReader backed by CircularEventBuffer
*/
class CircularEventReader : public TLV::TLVReader
{
public:
/**
* @brief
* Initializes a TLVReader object backed by CircularEventBuffer
*
* Reading begins in the CircularTLVBuffer belonging to this
* CircularEventBuffer. When the reader runs out of data, it begins
* to read from the previous CircularEventBuffer.
*
* @param[in] apBuf A pointer to a fully initialized CircularEventBuffer
*
*/
void Init(CircularEventBufferWrapper * apBuf);
virtual ~CircularEventReader() = default;
};
EventManagement & EventManagement::GetInstance()
{
return sInstance;
}
struct ReclaimEventCtx
{
CircularEventBuffer * mpEventBuffer = nullptr;
size_t mSpaceNeededForMovedEvent = 0;
};
/**
* @brief
* Internal structure for traversing event list.
*/
struct CopyAndAdjustDeltaTimeContext
{
CopyAndAdjustDeltaTimeContext(TLVWriter * aWriter, EventLoadOutContext * inContext) : mpWriter(aWriter), mpContext(inContext) {}
TLV::TLVWriter * mpWriter = nullptr;
EventLoadOutContext * mpContext = nullptr;
};
void EventManagement::Init(Messaging::ExchangeManager * apExchangeManager, uint32_t aNumBuffers,
CircularEventBuffer * apCircularEventBuffer, const LogStorageResources * const apLogStorageResources,
MonotonicallyIncreasingCounter<EventNumber> * apEventNumberCounter,
System::Clock::Milliseconds64 aMonotonicStartupTime)
{
CircularEventBuffer * current = nullptr;
CircularEventBuffer * prev = nullptr;
CircularEventBuffer * next = nullptr;
if (aNumBuffers == 0)
{
ChipLogError(EventLogging, "Invalid aNumBuffers");
return;
}
if (mState != EventManagementStates::Shutdown)
{
ChipLogError(EventLogging, "Invalid EventManagement State");
return;
}
mpExchangeMgr = apExchangeManager;
for (uint32_t bufferIndex = 0; bufferIndex < aNumBuffers; bufferIndex++)
{
next = (bufferIndex < aNumBuffers - 1) ? &apCircularEventBuffer[bufferIndex + 1] : nullptr;
current = &apCircularEventBuffer[bufferIndex];
current->Init(apLogStorageResources[bufferIndex].mpBuffer, apLogStorageResources[bufferIndex].mBufferSize, prev, next,
apLogStorageResources[bufferIndex].mPriority);
prev = current;
current->mProcessEvictedElement = nullptr;
current->mAppData = nullptr;
}
mpEventNumberCounter = apEventNumberCounter;
mLastEventNumber = mpEventNumberCounter->GetValue();
mpEventBuffer = apCircularEventBuffer;
mState = EventManagementStates::Idle;
mBytesWritten = 0;
mMonotonicStartupTime = aMonotonicStartupTime;
}
CHIP_ERROR EventManagement::CopyToNextBuffer(CircularEventBuffer * apEventBuffer)
{
CircularTLVWriter writer;
CircularTLVReader reader;
CHIP_ERROR err = CHIP_NO_ERROR;
CircularEventBuffer * nextBuffer = apEventBuffer->GetNextCircularEventBuffer();
if (nextBuffer == nullptr)
{
return CHIP_ERROR_INVALID_ARGUMENT;
}
CircularEventBuffer backup = *nextBuffer;
// Set up the next buffer s.t. it fails if needs to evict an element
nextBuffer->mProcessEvictedElement = AlwaysFail;
writer.Init(*nextBuffer);
// Set up the reader s.t. it is positioned to read the head event
reader.Init(*apEventBuffer);
err = reader.Next();
SuccessOrExit(err);
err = writer.CopyElement(reader);
SuccessOrExit(err);
err = writer.Finalize();
SuccessOrExit(err);
ChipLogDetail(EventLogging, "Copy Event to next buffer with priority %u", static_cast<unsigned>(nextBuffer->GetPriority()));
exit:
if (err != CHIP_NO_ERROR)
{
*nextBuffer = backup;
}
return err;
}
CHIP_ERROR EventManagement::EnsureSpaceInCircularBuffer(size_t aRequiredSpace, PriorityLevel aPriority)
{
CHIP_ERROR err = CHIP_NO_ERROR;
size_t requiredSpace = aRequiredSpace;
CircularEventBuffer * eventBuffer = mpEventBuffer;
ReclaimEventCtx ctx;
// Check that we have this much space in all our event buffers that might
// hold the event. If we do not, that will prevent the event from being
// properly evicted into higher-priority buffers. We want to discover
// this early, so that testing surfaces the need to make those buffers
// larger.
for (auto * currentBuffer = mpEventBuffer; currentBuffer; currentBuffer = currentBuffer->GetNextCircularEventBuffer())
{
VerifyOrExit(requiredSpace <= currentBuffer->GetTotalDataLength(), err = CHIP_ERROR_BUFFER_TOO_SMALL);
if (currentBuffer->IsFinalDestinationForPriority(aPriority))
{
break;
}
}
VerifyOrExit(eventBuffer != nullptr, err = CHIP_ERROR_INCORRECT_STATE);
// check whether we actually need to do anything, exit if we don't
VerifyOrExit(requiredSpace > eventBuffer->AvailableDataLength(), err = CHIP_NO_ERROR);
while (true)
{
if (requiredSpace > eventBuffer->AvailableDataLength())
{
ctx.mpEventBuffer = eventBuffer;
ctx.mSpaceNeededForMovedEvent = 0;
eventBuffer->mProcessEvictedElement = EvictEvent;
eventBuffer->mAppData = &ctx;
err = eventBuffer->EvictHead();
// one of two things happened: either the element was evicted immediately if the head's priority is same as current
// buffer(final one), or we figured out how much space we need to evict it into the next buffer, the check happens in
// EvictEvent function
if (err != CHIP_NO_ERROR)
{
VerifyOrExit(ctx.mSpaceNeededForMovedEvent != 0, /* no-op, return err */);
VerifyOrExit(eventBuffer->GetNextCircularEventBuffer() != nullptr, err = CHIP_ERROR_INCORRECT_STATE);
if (ctx.mSpaceNeededForMovedEvent <= eventBuffer->GetNextCircularEventBuffer()->AvailableDataLength())
{
// we can copy the event outright. copy event and
// subsequently evict head s.t. evicting the head
// element always succeeds.
// Since we're calling CopyElement and we've checked
// that there is space in the next buffer, we don't expect
// this to fail.
err = CopyToNextBuffer(eventBuffer);
SuccessOrExit(err);
// success; evict head unconditionally
eventBuffer->mProcessEvictedElement = nullptr;
err = eventBuffer->EvictHead();
// if unconditional eviction failed, this
// means that we have no way of further
// clearing the buffer. fail out and let the
// caller know that we could not honor the
// request
SuccessOrExit(err);
continue;
}
// we cannot copy event outright. We remember the
// current required space in mRequiredSpaceForEvicted, we note the
// space requirements for the event in the current
// buffer and make that space in the next buffer.
eventBuffer->SetRequiredSpaceforEvicted(requiredSpace);
eventBuffer = eventBuffer->GetNextCircularEventBuffer();
// Sanity check: return error here on null event buffer. If
// eventBuffer->mpNext were null, then the `EvictBuffer`
// would have succeeded -- the event was
// already in the final buffer.
VerifyOrExit(eventBuffer != nullptr, err = CHIP_ERROR_INCORRECT_STATE);
requiredSpace = ctx.mSpaceNeededForMovedEvent;
}
}
else
{
// this branch is only taken when we go back in the buffer chain since we have free/spare enough space in next buffer,
// and need to retry to copy event from current buffer to next buffer, and free space for current buffer
if (eventBuffer == mpEventBuffer)
break;
eventBuffer = eventBuffer->GetPreviousCircularEventBuffer();
requiredSpace = eventBuffer->GetRequiredSpaceforEvicted();
err = CHIP_NO_ERROR;
}
}
mpEventBuffer->mProcessEvictedElement = nullptr;
mpEventBuffer->mAppData = nullptr;
exit:
return err;
}
CHIP_ERROR EventManagement::CalculateEventSize(EventLoggingDelegate * apDelegate, const EventOptions * apOptions,
uint32_t & requiredSize)
{
System::PacketBufferTLVWriter writer;
EventLoadOutContext ctxt = EventLoadOutContext(writer, apOptions->mPriority, GetLastEventNumber());
System::PacketBufferHandle buf = System::PacketBufferHandle::New(kMaxEventSizeReserve);
if (buf.IsNull())
{
return CHIP_ERROR_NO_MEMORY;
}
writer.Init(std::move(buf));
ctxt.mCurrentEventNumber = mLastEventNumber;
ctxt.mCurrentTime = mLastEventTimestamp;
CHIP_ERROR err = ConstructEvent(&ctxt, apDelegate, apOptions);
if (err == CHIP_NO_ERROR)
{
requiredSize = writer.GetLengthWritten();
}
return err;
}
CHIP_ERROR EventManagement::ConstructEvent(EventLoadOutContext * apContext, EventLoggingDelegate * apDelegate,
const EventOptions * apOptions)
{
VerifyOrReturnError(apContext->mCurrentEventNumber >= apContext->mStartingEventNumber, CHIP_NO_ERROR
/* no-op: don't write event, but advance current event Number */);
VerifyOrReturnError(apOptions != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
EventReportIB::Builder eventReportBuilder;
ReturnErrorOnFailure(eventReportBuilder.Init(&(apContext->mWriter)));
EventDataIB::Builder & eventDataIBBuilder = eventReportBuilder.CreateEventData();
ReturnErrorOnFailure(eventReportBuilder.GetError());
EventPathIB::Builder & eventPathBuilder = eventDataIBBuilder.CreatePath();
ReturnErrorOnFailure(eventDataIBBuilder.GetError());
CHIP_ERROR err = eventPathBuilder.Endpoint(apOptions->mPath.mEndpointId)
.Cluster(apOptions->mPath.mClusterId)
.Event(apOptions->mPath.mEventId)
.EndOfEventPathIB();
ReturnErrorOnFailure(err);
eventDataIBBuilder.EventNumber(apContext->mCurrentEventNumber).Priority(chip::to_underlying(apContext->mPriority));
ReturnErrorOnFailure(eventDataIBBuilder.GetError());
if (apOptions->mTimestamp.IsSystem())
{
eventDataIBBuilder.SystemTimestamp(apOptions->mTimestamp.mValue);
}
else
{
eventDataIBBuilder.EpochTimestamp(apOptions->mTimestamp.mValue);
}
ReturnErrorOnFailure(eventDataIBBuilder.GetError());
// Callback to write the EventData
ReturnErrorOnFailure(apDelegate->WriteEvent(apContext->mWriter));
// The fabricIndex profile tag is internal use only for fabric filtering when retrieving event from circular event buffer,
// and would not go on the wire.
// Revisit FabricRemovedCB function should the encoding of fabricIndex change in the future.
if (apOptions->mFabricIndex != kUndefinedFabricIndex)
{
apContext->mWriter.Put(TLV::ProfileTag(kEventManagementProfile, kFabricIndexTag), apOptions->mFabricIndex);
}
ReturnErrorOnFailure(eventDataIBBuilder.EndOfEventDataIB());
ReturnErrorOnFailure(eventReportBuilder.EndOfEventReportIB());
ReturnErrorOnFailure(apContext->mWriter.Finalize());
apContext->mFirst = false;
return CHIP_NO_ERROR;
}
void EventManagement::CreateEventManagement(Messaging::ExchangeManager * apExchangeManager, uint32_t aNumBuffers,
CircularEventBuffer * apCircularEventBuffer,
const LogStorageResources * const apLogStorageResources,
MonotonicallyIncreasingCounter<EventNumber> * apEventNumberCounter,
System::Clock::Milliseconds64 aMonotonicStartupTime)
{
sInstance.Init(apExchangeManager, aNumBuffers, apCircularEventBuffer, apLogStorageResources, apEventNumberCounter,
aMonotonicStartupTime);
}
/**
* @brief Perform any actions we need to on shutdown.
*/
void EventManagement::DestroyEventManagement()
{
sInstance.mState = EventManagementStates::Shutdown;
sInstance.mpEventBuffer = nullptr;
sInstance.mpExchangeMgr = nullptr;
}
CircularEventBuffer * EventManagement::GetPriorityBuffer(PriorityLevel aPriority) const
{
CircularEventBuffer * buf = mpEventBuffer;
while (!buf->IsFinalDestinationForPriority(aPriority))
{
buf = buf->GetNextCircularEventBuffer();
assert(buf != nullptr);
// code guarantees that every PriorityLevel has a buffer destination.
}
return buf;
}
CHIP_ERROR EventManagement::CopyAndAdjustDeltaTime(const TLVReader & aReader, size_t aDepth, void * apContext)
{
CopyAndAdjustDeltaTimeContext * ctx = static_cast<CopyAndAdjustDeltaTimeContext *>(apContext);
TLVReader reader(aReader);
if (aReader.GetTag() == TLV::ProfileTag(kEventManagementProfile, kFabricIndexTag))
{
// Does not go on the wire.
return CHIP_NO_ERROR;
}
if ((aReader.GetTag() == TLV::ContextTag(EventDataIB::Tag::kSystemTimestamp)) && !(ctx->mpContext->mFirst) &&
(ctx->mpContext->mCurrentTime.mType == ctx->mpContext->mPreviousTime.mType))
{
return ctx->mpWriter->Put(TLV::ContextTag(EventDataIB::Tag::kDeltaSystemTimestamp),
ctx->mpContext->mCurrentTime.mValue - ctx->mpContext->mPreviousTime.mValue);
}
if ((aReader.GetTag() == TLV::ContextTag(EventDataIB::Tag::kEpochTimestamp)) && !(ctx->mpContext->mFirst) &&
(ctx->mpContext->mCurrentTime.mType == ctx->mpContext->mPreviousTime.mType))
{
return ctx->mpWriter->Put(TLV::ContextTag(EventDataIB::Tag::kDeltaEpochTimestamp),
ctx->mpContext->mCurrentTime.mValue - ctx->mpContext->mPreviousTime.mValue);
}
return ctx->mpWriter->CopyElement(reader);
}
void EventManagement::VendEventNumber()
{
CHIP_ERROR err = CHIP_NO_ERROR;
// Now advance the counter.
err = mpEventNumberCounter->Advance();
if (err != CHIP_NO_ERROR)
{
ChipLogError(EventLogging, "%s Advance() failed with %" CHIP_ERROR_FORMAT, __FUNCTION__, err.Format());
}
// Assign event Number to the buffer's counter's value.
mLastEventNumber = mpEventNumberCounter->GetValue();
}
CHIP_ERROR EventManagement::LogEvent(EventLoggingDelegate * apDelegate, const EventOptions & aEventOptions,
EventNumber & aEventNumber)
{
assertChipStackLockedByCurrentThread();
VerifyOrReturnError(mState != EventManagementStates::Shutdown, CHIP_ERROR_INCORRECT_STATE);
return LogEventPrivate(apDelegate, aEventOptions, aEventNumber);
}
CHIP_ERROR EventManagement::LogEventPrivate(EventLoggingDelegate * apDelegate, const EventOptions & aEventOptions,
EventNumber & aEventNumber)
{
CircularTLVWriter writer;
CHIP_ERROR err = CHIP_NO_ERROR;
uint32_t requestSize = 0;
aEventNumber = 0;
CircularTLVWriter checkpoint = writer;
EventLoadOutContext ctxt = EventLoadOutContext(writer, aEventOptions.mPriority, mLastEventNumber);
EventOptions opts;
Timestamp timestamp;
#if CHIP_DEVICE_CONFIG_EVENT_LOGGING_UTC_TIMESTAMPS
System::Clock::Milliseconds64 utc_time;
err = System::SystemClock().GetClock_RealTimeMS(utc_time);
if (err == CHIP_NO_ERROR)
{
timestamp = Timestamp::Epoch(utc_time);
}
else
#endif // CHIP_DEVICE_CONFIG_EVENT_LOGGING_UTC_TIMESTAMPS
{
auto systemTimeMs = System::SystemClock().GetMonotonicMilliseconds64() - mMonotonicStartupTime;
timestamp = Timestamp::System(systemTimeMs);
}
opts = EventOptions(timestamp);
// Start the event container (anonymous structure) in the circular buffer
writer.Init(*mpEventBuffer);
opts.mPriority = aEventOptions.mPriority;
// Create all event specific data
// Timestamp; encoded as a delta time
opts.mPath = aEventOptions.mPath;
opts.mFabricIndex = aEventOptions.mFabricIndex;
ctxt.mCurrentEventNumber = mLastEventNumber;
ctxt.mCurrentTime.mValue = mLastEventTimestamp.mValue;
err = CalculateEventSize(apDelegate, &opts, requestSize);
SuccessOrExit(err);
// Ensure we have space in the in-memory logging queues
err = EnsureSpaceInCircularBuffer(requestSize, aEventOptions.mPriority);
SuccessOrExit(err);
err = ConstructEvent(&ctxt, apDelegate, &opts);
SuccessOrExit(err);
mBytesWritten += writer.GetLengthWritten();
exit:
if (err != CHIP_NO_ERROR)
{
ChipLogError(EventLogging, "Log event with error %" CHIP_ERROR_FORMAT, err.Format());
writer = checkpoint;
}
else if (opts.mPriority >= CHIP_CONFIG_EVENT_GLOBAL_PRIORITY)
{
aEventNumber = mLastEventNumber;
VendEventNumber();
mLastEventTimestamp = timestamp;
#if CHIP_CONFIG_EVENT_LOGGING_VERBOSE_DEBUG_LOGS
ChipLogDetail(EventLogging,
"LogEvent event number: 0x" ChipLogFormatX64 " priority: %u, endpoint id: 0x%x"
" cluster id: " ChipLogFormatMEI " event id: 0x%" PRIx32 " %s timestamp: 0x" ChipLogFormatX64,
ChipLogValueX64(aEventNumber), static_cast<unsigned>(opts.mPriority), opts.mPath.mEndpointId,
ChipLogValueMEI(opts.mPath.mClusterId), opts.mPath.mEventId,
opts.mTimestamp.mType == Timestamp::Type::kSystem ? "Sys" : "Epoch", ChipLogValueX64(opts.mTimestamp.mValue));
#endif // CHIP_CONFIG_EVENT_LOGGING_VERBOSE_DEBUG_LOGS
err = InteractionModelEngine::GetInstance()->GetReportingEngine().ScheduleEventDelivery(opts.mPath, mBytesWritten);
}
return err;
}
CHIP_ERROR EventManagement::CopyEvent(const TLVReader & aReader, TLVWriter & aWriter, EventLoadOutContext * apContext)
{
TLVReader reader;
TLVType containerType;
TLVType containerType1;
CopyAndAdjustDeltaTimeContext context(&aWriter, apContext);
CHIP_ERROR err = CHIP_NO_ERROR;
reader.Init(aReader);
ReturnErrorOnFailure(reader.EnterContainer(containerType));
ReturnErrorOnFailure(aWriter.StartContainer(AnonymousTag(), kTLVType_Structure, containerType));
ReturnErrorOnFailure(reader.Next());
ReturnErrorOnFailure(reader.EnterContainer(containerType1));
ReturnErrorOnFailure(
aWriter.StartContainer(TLV::ContextTag(EventReportIB::Tag::kEventData), kTLVType_Structure, containerType1));
err = TLV::Utilities::Iterate(reader, CopyAndAdjustDeltaTime, &context, false /*recurse*/);
if (err == CHIP_END_OF_TLV)
{
err = CHIP_NO_ERROR;
}
ReturnErrorOnFailure(err);
ReturnErrorOnFailure(aWriter.EndContainer(containerType1));
ReturnErrorOnFailure(aWriter.EndContainer(containerType));
ReturnErrorOnFailure(aWriter.Finalize());
return CHIP_NO_ERROR;
}
CHIP_ERROR EventManagement::CheckEventContext(EventLoadOutContext * eventLoadOutContext,
const EventManagement::EventEnvelopeContext & event)
{
if (eventLoadOutContext->mCurrentEventNumber < eventLoadOutContext->mStartingEventNumber)
{
return CHIP_ERROR_UNEXPECTED_EVENT;
}
if (event.mFabricIndex.HasValue() &&
(event.mFabricIndex.Value() == kUndefinedFabricIndex ||
eventLoadOutContext->mSubjectDescriptor.fabricIndex != event.mFabricIndex.Value()))
{
return CHIP_ERROR_UNEXPECTED_EVENT;
}
ConcreteEventPath path(event.mEndpointId, event.mClusterId, event.mEventId);
CHIP_ERROR ret = CHIP_ERROR_UNEXPECTED_EVENT;
for (auto * interestedPath = eventLoadOutContext->mpInterestedEventPaths; interestedPath != nullptr;
interestedPath = interestedPath->mpNext)
{
if (interestedPath->mValue.IsEventPathSupersetOf(path))
{
ret = CHIP_NO_ERROR;
break;
}
}
ReturnErrorOnFailure(ret);
Access::RequestPath requestPath{ .cluster = event.mClusterId,
.endpoint = event.mEndpointId,
.requestType = Access::RequestType::kEventReadRequest,
.entityId = event.mEventId };
Access::Privilege requestPrivilege = RequiredPrivilege::ForReadEvent(path);
CHIP_ERROR accessControlError =
Access::GetAccessControl().Check(eventLoadOutContext->mSubjectDescriptor, requestPath, requestPrivilege);
if (accessControlError != CHIP_NO_ERROR)
{
ReturnErrorCodeIf((accessControlError != CHIP_ERROR_ACCESS_DENIED) &&
(accessControlError != CHIP_ERROR_ACCESS_RESTRICTED_BY_ARL),
accessControlError);
ret = CHIP_ERROR_UNEXPECTED_EVENT;
}
return ret;
}
CHIP_ERROR EventManagement::EventIterator(const TLVReader & aReader, size_t aDepth, EventLoadOutContext * apEventLoadOutContext,
EventEnvelopeContext * event)
{
CHIP_ERROR err = CHIP_NO_ERROR;
TLVReader innerReader;
TLVType tlvType;
TLVType tlvType1;
innerReader.Init(aReader);
VerifyOrDie(event != nullptr);
ReturnErrorOnFailure(innerReader.EnterContainer(tlvType));
ReturnErrorOnFailure(innerReader.Next());
ReturnErrorOnFailure(innerReader.EnterContainer(tlvType1));
err = TLV::Utilities::Iterate(innerReader, FetchEventParameters, event, false /*recurse*/);
if (event->mFieldsToRead != kRequiredEventField)
{
return CHIP_ERROR_INVALID_ARGUMENT;
}
if (err == CHIP_END_OF_TLV)
{
err = CHIP_NO_ERROR;
}
ReturnErrorOnFailure(err);
apEventLoadOutContext->mCurrentTime = event->mCurrentTime;
apEventLoadOutContext->mCurrentEventNumber = event->mEventNumber;
err = CheckEventContext(apEventLoadOutContext, *event);
if (err == CHIP_NO_ERROR)
{
err = CHIP_EVENT_ID_FOUND;
}
else if (err == CHIP_ERROR_UNEXPECTED_EVENT)
{
err = CHIP_NO_ERROR;
}
return err;
}
CHIP_ERROR EventManagement::CopyEventsSince(const TLVReader & aReader, size_t aDepth, void * apContext)
{
EventLoadOutContext * const loadOutContext = static_cast<EventLoadOutContext *>(apContext);
EventEnvelopeContext event;
CHIP_ERROR err = EventIterator(aReader, aDepth, loadOutContext, &event);
if (err == CHIP_EVENT_ID_FOUND)
{
// checkpoint the writer
TLV::TLVWriter checkpoint = loadOutContext->mWriter;
err = CopyEvent(aReader, loadOutContext->mWriter, loadOutContext);
// CHIP_NO_ERROR and CHIP_END_OF_TLV signify a
// successful copy. In all other cases, roll back the
// writer state back to the checkpoint, i.e., the state
// before we began the copy operation.
if ((err != CHIP_NO_ERROR) && (err != CHIP_END_OF_TLV))
{
loadOutContext->mWriter = checkpoint;
return err;
}
loadOutContext->mPreviousTime.mValue = loadOutContext->mCurrentTime.mValue;
loadOutContext->mFirst = false;
loadOutContext->mEventCount++;
}
return err;
}
CHIP_ERROR EventManagement::FetchEventsSince(TLVWriter & aWriter, const SingleLinkedListNode<EventPathParams> * apEventPathList,
EventNumber & aEventMin, size_t & aEventCount,
const Access::SubjectDescriptor & aSubjectDescriptor)
{
// TODO: Add particular set of event Paths in FetchEventsSince so that we can filter the interested paths
CHIP_ERROR err = CHIP_NO_ERROR;
const bool recurse = false;
TLVReader reader;
CircularEventBufferWrapper bufWrapper;
EventLoadOutContext context(aWriter, PriorityLevel::Invalid, aEventMin);
context.mSubjectDescriptor = aSubjectDescriptor;
context.mpInterestedEventPaths = apEventPathList;
err = GetEventReader(reader, PriorityLevel::Critical, &bufWrapper);
SuccessOrExit(err);
err = TLV::Utilities::Iterate(reader, CopyEventsSince, &context, recurse);
if (err == CHIP_END_OF_TLV)
{
err = CHIP_NO_ERROR;
}
exit:
if (err == CHIP_ERROR_BUFFER_TOO_SMALL || err == CHIP_ERROR_NO_MEMORY)
{
// We failed to fetch the current event because the buffer is too small, we will start from this one the next time.
aEventMin = context.mCurrentEventNumber;
}
else
{
// For all other cases, continue from the next event.
aEventMin = context.mCurrentEventNumber + 1;
}
aEventCount += context.mEventCount;
return err;
}
CHIP_ERROR EventManagement::FabricRemovedCB(const TLV::TLVReader & aReader, size_t aDepth, void * apContext)
{
// the function does not actually remove the event, instead, it sets the fabric index to an invalid value.
FabricIndex * invalidFabricIndex = static_cast<FabricIndex *>(apContext);
TLVReader event;
TLVType tlvType;
TLVType tlvType1;
event.Init(aReader);
VerifyOrReturnError(event.EnterContainer(tlvType) == CHIP_NO_ERROR, CHIP_NO_ERROR);
VerifyOrReturnError(event.Next(TLV::ContextTag(EventReportIB::Tag::kEventData)) == CHIP_NO_ERROR, CHIP_NO_ERROR);
VerifyOrReturnError(event.EnterContainer(tlvType1) == CHIP_NO_ERROR, CHIP_NO_ERROR);
while (CHIP_NO_ERROR == event.Next())
{
if (event.GetTag() == TLV::ProfileTag(kEventManagementProfile, kFabricIndexTag))
{
uint8_t fabricIndex = 0;
VerifyOrReturnError(event.Get(fabricIndex) == CHIP_NO_ERROR, CHIP_NO_ERROR);
if (fabricIndex == *invalidFabricIndex)
{
TLVCircularBuffer * readBuffer = static_cast<TLVCircularBuffer *>(event.GetBackingStore());
// fabricIndex is encoded as an integer; the dataPtr will point to a location immediately after its encoding
// shift the dataPtr to point to the encoding of the fabric index, accounting for wraparound in backing storage
// we cannot get the actual encoding size from current container beginning to the fabric index because of several
// optional parameters, so we are assuming minimal encoding is used and the fabric index is 1 byte.
uint8_t * dataPtr;
if (event.GetReadPoint() != readBuffer->GetQueue())
{
dataPtr = readBuffer->GetQueue() + (event.GetReadPoint() - readBuffer->GetQueue() - 1);
}
else
{
dataPtr = readBuffer->GetQueue() + readBuffer->GetTotalDataLength() - 1;
}
*dataPtr = kUndefinedFabricIndex;
}
return CHIP_NO_ERROR;
}
}
return CHIP_NO_ERROR;
}
CHIP_ERROR EventManagement::FabricRemoved(FabricIndex aFabricIndex)
{
const bool recurse = false;
TLVReader reader;
CircularEventBufferWrapper bufWrapper;
ReturnErrorOnFailure(GetEventReader(reader, PriorityLevel::Critical, &bufWrapper));
CHIP_ERROR err = TLV::Utilities::Iterate(reader, FabricRemovedCB, &aFabricIndex, recurse);
if (err == CHIP_END_OF_TLV)
{
err = CHIP_NO_ERROR;
}
return err;
}
CHIP_ERROR EventManagement::GetEventReader(TLVReader & aReader, PriorityLevel aPriority, CircularEventBufferWrapper * apBufWrapper)
{
CircularEventBuffer * buffer = GetPriorityBuffer(aPriority);
VerifyOrReturnError(buffer != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
apBufWrapper->mpCurrent = buffer;
CircularEventReader reader;
reader.Init(apBufWrapper);
aReader.Init(reader);
return CHIP_NO_ERROR;
}
CHIP_ERROR EventManagement::FetchEventParameters(const TLVReader & aReader, size_t, void * apContext)
{
EventEnvelopeContext * const envelope = static_cast<EventEnvelopeContext *>(apContext);
TLVReader reader;
reader.Init(aReader);
if (reader.GetTag() == TLV::ContextTag(EventDataIB::Tag::kPath))
{
EventPathIB::Parser path;
ReturnErrorOnFailure(path.Init(aReader));
ReturnErrorOnFailure(path.GetEndpoint(&(envelope->mEndpointId)));
ReturnErrorOnFailure(path.GetCluster(&(envelope->mClusterId)));
ReturnErrorOnFailure(path.GetEvent(&(envelope->mEventId)));
envelope->mFieldsToRead |= 1 << to_underlying(EventDataIB::Tag::kPath);
}
if (reader.GetTag() == TLV::ContextTag(EventDataIB::Tag::kPriority))
{
uint16_t extPriority; // Note: the type here matches the type case in EventManagement::LogEvent, priority section
ReturnErrorOnFailure(reader.Get(extPriority));
envelope->mPriority = static_cast<PriorityLevel>(extPriority);
envelope->mFieldsToRead |= 1 << to_underlying(EventDataIB::Tag::kPriority);
}
if (reader.GetTag() == TLV::ContextTag(EventDataIB::Tag::kEventNumber))
{
ReturnErrorOnFailure(reader.Get(envelope->mEventNumber));
}
if (reader.GetTag() == TLV::ContextTag(EventDataIB::Tag::kSystemTimestamp))
{
uint64_t systemTime;
ReturnErrorOnFailure(reader.Get(systemTime));
envelope->mCurrentTime.mType = Timestamp::Type::kSystem;
envelope->mCurrentTime.mValue = systemTime;
}
if (reader.GetTag() == TLV::ContextTag(EventDataIB::Tag::kEpochTimestamp))
{
uint64_t epochTime;
ReturnErrorOnFailure(reader.Get(epochTime));
envelope->mCurrentTime.mType = Timestamp::Type::kEpoch;
envelope->mCurrentTime.mValue = epochTime;
}
if (reader.GetTag() == TLV::ProfileTag(kEventManagementProfile, kFabricIndexTag))
{
uint8_t fabricIndex = kUndefinedFabricIndex;
ReturnErrorOnFailure(reader.Get(fabricIndex));
envelope->mFabricIndex.SetValue(fabricIndex);
}
return CHIP_NO_ERROR;
}
CHIP_ERROR EventManagement::EvictEvent(TLVCircularBuffer & apBuffer, void * apAppData, TLVReader & aReader)
{
// pull out the delta time, pull out the priority
ReturnErrorOnFailure(aReader.Next());
TLVType containerType;
TLVType containerType1;
ReturnErrorOnFailure(aReader.EnterContainer(containerType));
ReturnErrorOnFailure(aReader.Next());
ReturnErrorOnFailure(aReader.EnterContainer(containerType1));
EventEnvelopeContext context;
constexpr bool recurse = false;
CHIP_ERROR err = TLV::Utilities::Iterate(aReader, FetchEventParameters, &context, recurse);
if (err == CHIP_END_OF_TLV)
{
err = CHIP_NO_ERROR;
}
ReturnErrorOnFailure(err);
ReturnErrorOnFailure(aReader.ExitContainer(containerType1));
ReturnErrorOnFailure(aReader.ExitContainer(containerType));
const PriorityLevel imp = static_cast<PriorityLevel>(context.mPriority);
ReclaimEventCtx * const ctx = static_cast<ReclaimEventCtx *>(apAppData);
CircularEventBuffer * const eventBuffer = ctx->mpEventBuffer;
if (eventBuffer->IsFinalDestinationForPriority(imp))
{
ChipLogProgress(EventLogging,
"Dropped 1 event from buffer with priority %u and event number 0x" ChipLogFormatX64
" due to overflow: event priority_level: %u",
static_cast<unsigned>(eventBuffer->GetPriority()), ChipLogValueX64(context.mEventNumber),
static_cast<unsigned>(imp));
ctx->mSpaceNeededForMovedEvent = 0;
return CHIP_NO_ERROR;
}
// event is not getting dropped. Note how much space it requires, and return.
ctx->mSpaceNeededForMovedEvent = aReader.GetLengthRead();
return CHIP_END_OF_TLV;
}
void EventManagement::SetScheduledEventInfo(EventNumber & aEventNumber, uint32_t & aInitialWrittenEventBytes) const
{
aEventNumber = mLastEventNumber;
aInitialWrittenEventBytes = mBytesWritten;
}
void CircularEventBuffer::Init(uint8_t * apBuffer, uint32_t aBufferLength, CircularEventBuffer * apPrev,
CircularEventBuffer * apNext, PriorityLevel aPriorityLevel)
{
TLVCircularBuffer::Init(apBuffer, aBufferLength);
mpPrev = apPrev;
mpNext = apNext;
mPriority = aPriorityLevel;
}
bool CircularEventBuffer::IsFinalDestinationForPriority(PriorityLevel aPriority) const
{
return !((mpNext != nullptr) && (mpNext->mPriority <= aPriority));
}
/**
* @brief
* TLVCircularBuffer::OnInit can modify the state of the buffer, but we don't want that behavior here.
* We want to make sure we don't change our state, and just report the currently-available space.
*/
CHIP_ERROR CircularEventBuffer::OnInit(TLV::TLVWriter & writer, uint8_t *& bufStart, uint32_t & bufLen)
{
GetCurrentWritableBuffer(bufStart, bufLen);
return CHIP_NO_ERROR;
}
void CircularEventReader::Init(CircularEventBufferWrapper * apBufWrapper)
{
CircularEventBuffer * prev;
if (apBufWrapper->mpCurrent == nullptr)
return;
TLVReader::Init(*apBufWrapper, apBufWrapper->mpCurrent->DataLength());
mMaxLen = apBufWrapper->mpCurrent->DataLength();
for (prev = apBufWrapper->mpCurrent->GetPreviousCircularEventBuffer(); prev != nullptr;
prev = prev->GetPreviousCircularEventBuffer())
{
CircularEventBufferWrapper bufWrapper;
bufWrapper.mpCurrent = prev;
mMaxLen += prev->DataLength();
}
}
CHIP_ERROR CircularEventBufferWrapper::GetNextBuffer(TLVReader & aReader, const uint8_t *& aBufStart, uint32_t & aBufLen)
{
CHIP_ERROR err = CHIP_NO_ERROR;
mpCurrent->GetNextBuffer(aReader, aBufStart, aBufLen);
SuccessOrExit(err);
if ((aBufLen == 0) && (mpCurrent->GetPreviousCircularEventBuffer() != nullptr))
{
mpCurrent = mpCurrent->GetPreviousCircularEventBuffer();
aBufStart = nullptr;
err = GetNextBuffer(aReader, aBufStart, aBufLen);
}
exit:
return err;
}
} // namespace app
} // namespace chip