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/*
*
* Copyright (c) 2020 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 defines object for a CHIP IM Invoke Command Handler
*
*/
#include "CommandHandler.h"
#include "InteractionModelEngine.h"
#include "RequiredPrivilege.h"
#include "messaging/ExchangeContext.h"
#include <access/AccessControl.h>
#include <app-common/zap-generated/cluster-objects.h>
#include <app/RequiredPrivilege.h>
#include <app/util/MatterCallbacks.h>
#include <credentials/GroupDataProvider.h>
#include <lib/core/TLVData.h>
#include <lib/core/TLVUtilities.h>
#include <lib/support/TypeTraits.h>
#include <platform/LockTracker.h>
#include <protocols/secure_channel/Constants.h>
namespace chip {
namespace app {
using Status = Protocols::InteractionModel::Status;
CommandHandler::CommandHandler(Callback * apCallback) : mExchangeCtx(*this), mpCallback(apCallback), mSuppressResponse(false) {}
CHIP_ERROR CommandHandler::AllocateBuffer()
{
if (!mBufferAllocated)
{
mCommandMessageWriter.Reset();
System::PacketBufferHandle commandPacket = System::PacketBufferHandle::New(chip::app::kMaxSecureSduLengthBytes);
VerifyOrReturnError(!commandPacket.IsNull(), CHIP_ERROR_NO_MEMORY);
mCommandMessageWriter.Init(std::move(commandPacket));
ReturnErrorOnFailure(mInvokeResponseBuilder.Init(&mCommandMessageWriter));
mInvokeResponseBuilder.SuppressResponse(mSuppressResponse);
ReturnErrorOnFailure(mInvokeResponseBuilder.GetError());
mInvokeResponseBuilder.CreateInvokeResponses();
ReturnErrorOnFailure(mInvokeResponseBuilder.GetError());
mBufferAllocated = true;
}
return CHIP_NO_ERROR;
}
void CommandHandler::OnInvokeCommandRequest(Messaging::ExchangeContext * ec, const PayloadHeader & payloadHeader,
System::PacketBufferHandle && payload, bool isTimedInvoke)
{
System::PacketBufferHandle response;
Status status = Status::Failure;
VerifyOrDieWithMsg(ec != nullptr, DataManagement, "Incoming exchange context should not be null");
VerifyOrDieWithMsg(mState == State::Idle, DataManagement, "state should be Idle");
// NOTE: we already know this is an InvokeCommand Request message because we explicitly registered with the
// Exchange Manager for unsolicited InvokeCommand Requests.
mExchangeCtx.Grab(ec);
// Use the RAII feature, if this is the only Handle when this function returns, DecrementHoldOff will trigger sending response.
// TODO: This is broken! If something under here returns error, we will try
// to SendCommandResponse(), and then our caller will try to send a status
// response too. Figure out at what point it's our responsibility to
// handler errors vs our caller's.
Handle workHandle(this);
mExchangeCtx->WillSendMessage();
status = ProcessInvokeRequest(std::move(payload), isTimedInvoke);
if (status != Status::Success)
{
StatusResponse::Send(status, mExchangeCtx.Get(), false /*aExpectResponse*/);
mSentStatusResponse = true;
}
}
Status CommandHandler::ProcessInvokeRequest(System::PacketBufferHandle && payload, bool isTimedInvoke)
{
CHIP_ERROR err = CHIP_NO_ERROR;
System::PacketBufferTLVReader reader;
TLV::TLVReader invokeRequestsReader;
InvokeRequestMessage::Parser invokeRequestMessage;
InvokeRequests::Parser invokeRequests;
reader.Init(std::move(payload));
VerifyOrReturnError(invokeRequestMessage.Init(reader) == CHIP_NO_ERROR, Status::InvalidAction);
#if CHIP_CONFIG_IM_PRETTY_PRINT
invokeRequestMessage.PrettyPrint();
#endif
VerifyOrReturnError(invokeRequestMessage.GetSuppressResponse(&mSuppressResponse) == CHIP_NO_ERROR, Status::InvalidAction);
VerifyOrReturnError(invokeRequestMessage.GetTimedRequest(&mTimedRequest) == CHIP_NO_ERROR, Status::InvalidAction);
VerifyOrReturnError(invokeRequestMessage.GetInvokeRequests(&invokeRequests) == CHIP_NO_ERROR, Status::InvalidAction);
VerifyOrReturnError(mTimedRequest == isTimedInvoke, Status::UnsupportedAccess);
invokeRequests.GetReader(&invokeRequestsReader);
{
// We don't support handling multiple commands but the protocol is ready to support it in the future, reject all of them and
// IM Engine will send a status response.
size_t commandCount = 0;
TLV::Utilities::Count(invokeRequestsReader, commandCount, false /* recurse */);
VerifyOrReturnError(commandCount == 1, Status::InvalidAction);
}
while (CHIP_NO_ERROR == (err = invokeRequestsReader.Next()))
{
VerifyOrReturnError(TLV::AnonymousTag() == invokeRequestsReader.GetTag(), Status::InvalidAction);
CommandDataIB::Parser commandData;
VerifyOrReturnError(commandData.Init(invokeRequestsReader) == CHIP_NO_ERROR, Status::InvalidAction);
Status status = Status::Success;
if (mExchangeCtx->IsGroupExchangeContext())
{
status = ProcessGroupCommandDataIB(commandData);
}
else
{
status = ProcessCommandDataIB(commandData);
}
if (status != Status::Success)
{
return status;
}
}
// if we have exhausted this container
if (CHIP_END_OF_TLV == err)
{
err = CHIP_NO_ERROR;
}
VerifyOrReturnError(err == CHIP_NO_ERROR, Status::InvalidAction);
VerifyOrReturnError(invokeRequestMessage.ExitContainer() == CHIP_NO_ERROR, Status::InvalidAction);
return Status::Success;
}
CHIP_ERROR CommandHandler::OnMessageReceived(Messaging::ExchangeContext * apExchangeContext, const PayloadHeader & aPayloadHeader,
System::PacketBufferHandle && aPayload)
{
ChipLogDetail(DataManagement, "CommandHandler: Unexpected message type %d", aPayloadHeader.GetMessageType());
StatusResponse::Send(Status::InvalidAction, mExchangeCtx.Get(), false /*aExpectResponse*/);
return CHIP_ERROR_INVALID_MESSAGE_TYPE;
}
void CommandHandler::Close()
{
mSuppressResponse = false;
MoveToState(State::AwaitingDestruction);
// We must finish all async work before we can shut down a CommandHandler. The actual CommandHandler MUST finish their work
// in reasonable time or there is a bug. The only case for releasing CommandHandler without CommandHandler::Handle releasing its
// reference is the stack shutting down, in which case Close() is not called. So the below check should always pass.
VerifyOrDieWithMsg(mPendingWork == 0, DataManagement, "CommandHandler::Close() called with %u unfinished async work items",
static_cast<unsigned int>(mPendingWork));
if (mpCallback)
{
mpCallback->OnDone(*this);
}
}
void CommandHandler::IncrementHoldOff()
{
mPendingWork++;
}
void CommandHandler::DecrementHoldOff()
{
mPendingWork--;
ChipLogDetail(DataManagement, "Decreasing reference count for CommandHandler, remaining %u",
static_cast<unsigned int>(mPendingWork));
if (mPendingWork != 0)
{
return;
}
if (!mSentStatusResponse)
{
if (!mExchangeCtx)
{
ChipLogProgress(DataManagement, "Skipping command response: exchange context is null");
}
else if (!mExchangeCtx->IsGroupExchangeContext())
{
CHIP_ERROR err = SendCommandResponse();
if (err != CHIP_NO_ERROR)
{
ChipLogError(DataManagement, "Failed to send command response: %" CHIP_ERROR_FORMAT, err.Format());
}
}
}
Close();
}
CHIP_ERROR CommandHandler::SendCommandResponse()
{
System::PacketBufferHandle commandPacket;
VerifyOrReturnError(mPendingWork == 0, CHIP_ERROR_INCORRECT_STATE);
VerifyOrReturnError(mState == State::AddedCommand, CHIP_ERROR_INCORRECT_STATE);
VerifyOrReturnError(mExchangeCtx, CHIP_ERROR_INCORRECT_STATE);
ReturnErrorOnFailure(Finalize(commandPacket));
ReturnErrorOnFailure(
mExchangeCtx->SendMessage(Protocols::InteractionModel::MsgType::InvokeCommandResponse, std::move(commandPacket)));
// The ExchangeContext is automatically freed here, and it makes mpExchangeCtx be temporarily dangling, but in
// all cases, we are going to call Close immediately after this function, which nulls out mpExchangeCtx.
MoveToState(State::CommandSent);
return CHIP_NO_ERROR;
}
namespace {
// We use this when the sender did not actually provide a CommandFields struct,
// to avoid downstream consumers having to worry about cases when there is or is
// not a struct available. We use an empty struct with anonymous tag, since we
// can't use a context tag at top level, and consumers should not care about the
// tag here).
constexpr uint8_t sNoFields[] = {
CHIP_TLV_STRUCTURE(CHIP_TLV_TAG_ANONYMOUS),
CHIP_TLV_END_OF_CONTAINER,
};
} // anonymous namespace
Status CommandHandler::ProcessCommandDataIB(CommandDataIB::Parser & aCommandElement)
{
CHIP_ERROR err = CHIP_NO_ERROR;
CommandPathIB::Parser commandPath;
ConcreteCommandPath concretePath(0, 0, 0);
TLV::TLVReader commandDataReader;
// NOTE: errors may occur before the concrete command path is even fully decoded.
err = aCommandElement.GetPath(&commandPath);
VerifyOrReturnError(err == CHIP_NO_ERROR, Status::InvalidAction);
err = commandPath.GetClusterId(&concretePath.mClusterId);
VerifyOrReturnError(err == CHIP_NO_ERROR, Status::InvalidAction);
err = commandPath.GetCommandId(&concretePath.mCommandId);
VerifyOrReturnError(err == CHIP_NO_ERROR, Status::InvalidAction);
err = commandPath.GetEndpointId(&concretePath.mEndpointId);
VerifyOrReturnError(err == CHIP_NO_ERROR, Status::InvalidAction);
{
Status commandExists = mpCallback->CommandExists(concretePath);
if (commandExists != Status::Success)
{
ChipLogDetail(DataManagement, "No command " ChipLogFormatMEI " in Cluster " ChipLogFormatMEI " on Endpoint 0x%x",
ChipLogValueMEI(concretePath.mCommandId), ChipLogValueMEI(concretePath.mClusterId),
concretePath.mEndpointId);
return AddStatus(concretePath, commandExists) != CHIP_NO_ERROR ? Status::Failure : Status::Success;
}
}
VerifyOrExit(mExchangeCtx && mExchangeCtx->HasSessionHandle(), err = CHIP_ERROR_INCORRECT_STATE);
{
Access::SubjectDescriptor subjectDescriptor = GetSubjectDescriptor();
Access::RequestPath requestPath{ .cluster = concretePath.mClusterId, .endpoint = concretePath.mEndpointId };
Access::Privilege requestPrivilege = RequiredPrivilege::ForInvokeCommand(concretePath);
err = Access::GetAccessControl().Check(subjectDescriptor, requestPath, requestPrivilege);
if (err != CHIP_NO_ERROR)
{
if (err != CHIP_ERROR_ACCESS_DENIED)
{
return AddStatus(concretePath, Status::Failure) != CHIP_NO_ERROR ? Status::Failure : Status::Success;
}
// TODO: when wildcard invokes are supported, handle them to discard rather than fail with status
return AddStatus(concretePath, Status::UnsupportedAccess) != CHIP_NO_ERROR ? Status::Failure : Status::Success;
}
}
if (CommandNeedsTimedInvoke(concretePath.mClusterId, concretePath.mCommandId) && !IsTimedInvoke())
{
// TODO: when wildcard invokes are supported, discard a
// wildcard-expanded path instead of returning a status.
return AddStatus(concretePath, Status::NeedsTimedInteraction) != CHIP_NO_ERROR ? Status::Failure : Status::Success;
}
if (CommandIsFabricScoped(concretePath.mClusterId, concretePath.mCommandId))
{
// Fabric-scoped commands are not allowed before a specific accessing fabric is available.
// This is mostly just during a PASE session before AddNOC.
if (GetAccessingFabricIndex() == kUndefinedFabricIndex)
{
// TODO: when wildcard invokes are supported, discard a
// wildcard-expanded path instead of returning a status.
return AddStatus(concretePath, Status::UnsupportedAccess) != CHIP_NO_ERROR ? Status::Failure : Status::Success;
}
}
err = aCommandElement.GetFields(&commandDataReader);
if (CHIP_END_OF_TLV == err)
{
ChipLogDetail(DataManagement,
"Received command without data for Endpoint=%u Cluster=" ChipLogFormatMEI " Command=" ChipLogFormatMEI,
concretePath.mEndpointId, ChipLogValueMEI(concretePath.mClusterId), ChipLogValueMEI(concretePath.mCommandId));
commandDataReader.Init(sNoFields);
err = commandDataReader.Next();
}
if (CHIP_NO_ERROR == err)
{
ChipLogDetail(DataManagement, "Received command for Endpoint=%u Cluster=" ChipLogFormatMEI " Command=" ChipLogFormatMEI,
concretePath.mEndpointId, ChipLogValueMEI(concretePath.mClusterId), ChipLogValueMEI(concretePath.mCommandId));
SuccessOrExit(MatterPreCommandReceivedCallback(concretePath, GetSubjectDescriptor()));
mpCallback->DispatchCommand(*this, concretePath, commandDataReader);
MatterPostCommandReceivedCallback(concretePath, GetSubjectDescriptor());
}
exit:
if (err != CHIP_NO_ERROR)
{
return AddStatus(concretePath, Status::InvalidCommand) != CHIP_NO_ERROR ? Status::Failure : Status::Success;
}
// We have handled the error status above and put the error status in response, now return success status so we can process
// other commands in the invoke request.
return Status::Success;
}
Status CommandHandler::ProcessGroupCommandDataIB(CommandDataIB::Parser & aCommandElement)
{
CHIP_ERROR err = CHIP_NO_ERROR;
CommandPathIB::Parser commandPath;
TLV::TLVReader commandDataReader;
ClusterId clusterId;
CommandId commandId;
GroupId groupId;
FabricIndex fabric;
Credentials::GroupDataProvider::GroupEndpoint mapping;
Credentials::GroupDataProvider * groupDataProvider = Credentials::GetGroupDataProvider();
Credentials::GroupDataProvider::EndpointIterator * iterator;
err = aCommandElement.GetPath(&commandPath);
VerifyOrReturnError(err == CHIP_NO_ERROR, Status::InvalidAction);
err = commandPath.GetClusterId(&clusterId);
VerifyOrReturnError(err == CHIP_NO_ERROR, Status::InvalidAction);
err = commandPath.GetCommandId(&commandId);
VerifyOrReturnError(err == CHIP_NO_ERROR, Status::InvalidAction);
groupId = mExchangeCtx->GetSessionHandle()->AsIncomingGroupSession()->GetGroupId();
fabric = GetAccessingFabricIndex();
ChipLogDetail(DataManagement, "Received group command for Group=%u Cluster=" ChipLogFormatMEI " Command=" ChipLogFormatMEI,
groupId, ChipLogValueMEI(clusterId), ChipLogValueMEI(commandId));
err = aCommandElement.GetFields(&commandDataReader);
if (CHIP_END_OF_TLV == err)
{
ChipLogDetail(DataManagement,
"Received command without data for Group=%u Cluster=" ChipLogFormatMEI " Command=" ChipLogFormatMEI, groupId,
ChipLogValueMEI(clusterId), ChipLogValueMEI(commandId));
commandDataReader.Init(sNoFields);
err = commandDataReader.Next();
VerifyOrReturnError(err == CHIP_NO_ERROR, Status::InvalidAction);
}
VerifyOrReturnError(err == CHIP_NO_ERROR, Status::Failure);
// Per spec, we do the "is this a timed command?" check for every path, but
// since all paths that fail it just get silently discarded we can do it
// once up front and discard all the paths at once. Ordering with respect
// to ACL and command presence checks does not matter, because the behavior
// is the same for all of them: ignore the path.
if (CommandNeedsTimedInvoke(clusterId, commandId))
{
// Group commands are never timed.
return Status::Success;
}
// No check for `CommandIsFabricScoped` unlike in `ProcessCommandDataIB()` since group commands
// always have an accessing fabric, by definition.
// Find which endpoints can process the command, and dispatch to them.
iterator = groupDataProvider->IterateEndpoints(fabric);
VerifyOrReturnError(iterator != nullptr, Status::Failure);
while (iterator->Next(mapping))
{
if (groupId != mapping.group_id)
{
continue;
}
ChipLogDetail(DataManagement,
"Processing group command for Endpoint=%u Cluster=" ChipLogFormatMEI " Command=" ChipLogFormatMEI,
mapping.endpoint_id, ChipLogValueMEI(clusterId), ChipLogValueMEI(commandId));
const ConcreteCommandPath concretePath(mapping.endpoint_id, clusterId, commandId);
if (mpCallback->CommandExists(concretePath) != Status::Success)
{
ChipLogDetail(DataManagement, "No command " ChipLogFormatMEI " in Cluster " ChipLogFormatMEI " on Endpoint 0x%x",
ChipLogValueMEI(commandId), ChipLogValueMEI(clusterId), mapping.endpoint_id);
continue;
}
{
Access::SubjectDescriptor subjectDescriptor = GetSubjectDescriptor();
Access::RequestPath requestPath{ .cluster = concretePath.mClusterId, .endpoint = concretePath.mEndpointId };
Access::Privilege requestPrivilege = RequiredPrivilege::ForInvokeCommand(concretePath);
err = Access::GetAccessControl().Check(subjectDescriptor, requestPath, requestPrivilege);
if (err != CHIP_NO_ERROR)
{
// NOTE: an expected error is CHIP_ERROR_ACCESS_DENIED, but there could be other unexpected errors;
// therefore, keep processing subsequent commands, and if any errors continue, those subsequent
// commands will likewise fail.
continue;
}
}
if ((err = MatterPreCommandReceivedCallback(concretePath, GetSubjectDescriptor())) == CHIP_NO_ERROR)
{
TLV::TLVReader dataReader(commandDataReader);
mpCallback->DispatchCommand(*this, concretePath, dataReader);
MatterPostCommandReceivedCallback(concretePath, GetSubjectDescriptor());
}
else
{
ChipLogError(DataManagement,
"Error when calling MatterPreCommandReceivedCallback for Endpoint=%u Cluster=" ChipLogFormatMEI
" Command=" ChipLogFormatMEI " : %" CHIP_ERROR_FORMAT,
mapping.endpoint_id, ChipLogValueMEI(clusterId), ChipLogValueMEI(commandId), err.Format());
continue;
}
}
iterator->Release();
return Status::Success;
}
CHIP_ERROR CommandHandler::AddStatusInternal(const ConcreteCommandPath & aCommandPath, const StatusIB & aStatus)
{
ReturnErrorOnFailure(PrepareStatus(aCommandPath));
CommandStatusIB::Builder & commandStatus = mInvokeResponseBuilder.GetInvokeResponses().GetInvokeResponse().GetStatus();
StatusIB::Builder & statusIBBuilder = commandStatus.CreateErrorStatus();
ReturnErrorOnFailure(commandStatus.GetError());
statusIBBuilder.EncodeStatusIB(aStatus);
ReturnErrorOnFailure(statusIBBuilder.GetError());
return FinishStatus();
}
CHIP_ERROR CommandHandler::AddStatus(const ConcreteCommandPath & aCommandPath, const Status aStatus)
{
return AddStatusInternal(aCommandPath, StatusIB(aStatus));
}
CHIP_ERROR CommandHandler::AddClusterSpecificSuccess(const ConcreteCommandPath & aCommandPath, ClusterStatus aClusterStatus)
{
return AddStatusInternal(aCommandPath, StatusIB(Status::Success, aClusterStatus));
}
CHIP_ERROR CommandHandler::AddClusterSpecificFailure(const ConcreteCommandPath & aCommandPath, ClusterStatus aClusterStatus)
{
return AddStatusInternal(aCommandPath, StatusIB(Status::Failure, aClusterStatus));
}
CHIP_ERROR CommandHandler::PrepareCommand(const ConcreteCommandPath & aCommandPath, bool aStartDataStruct)
{
ReturnErrorOnFailure(AllocateBuffer());
mInvokeResponseBuilder.Checkpoint(mBackupWriter);
//
// We must not be in the middle of preparing a command, or having prepared or sent one.
//
VerifyOrReturnError(mState == State::Idle, CHIP_ERROR_INCORRECT_STATE);
MoveToState(State::Preparing);
InvokeResponseIBs::Builder & invokeResponses = mInvokeResponseBuilder.GetInvokeResponses();
InvokeResponseIB::Builder & invokeResponse = invokeResponses.CreateInvokeResponse();
ReturnErrorOnFailure(invokeResponses.GetError());
CommandDataIB::Builder & commandData = invokeResponse.CreateCommand();
ReturnErrorOnFailure(commandData.GetError());
CommandPathIB::Builder & path = commandData.CreatePath();
ReturnErrorOnFailure(commandData.GetError());
ReturnErrorOnFailure(path.Encode(aCommandPath));
if (aStartDataStruct)
{
ReturnErrorOnFailure(commandData.GetWriter()->StartContainer(TLV::ContextTag(to_underlying(CommandDataIB::Tag::kFields)),
TLV::kTLVType_Structure, mDataElementContainerType));
}
MoveToState(State::AddingCommand);
return CHIP_NO_ERROR;
}
CHIP_ERROR CommandHandler::FinishCommand(bool aStartDataStruct)
{
VerifyOrReturnError(mState == State::AddingCommand, CHIP_ERROR_INCORRECT_STATE);
CommandDataIB::Builder & commandData = mInvokeResponseBuilder.GetInvokeResponses().GetInvokeResponse().GetCommand();
if (aStartDataStruct)
{
ReturnErrorOnFailure(commandData.GetWriter()->EndContainer(mDataElementContainerType));
}
ReturnErrorOnFailure(commandData.EndOfCommandDataIB().GetError());
ReturnErrorOnFailure(mInvokeResponseBuilder.GetInvokeResponses().GetInvokeResponse().EndOfInvokeResponseIB().GetError());
ReturnErrorOnFailure(mInvokeResponseBuilder.GetInvokeResponses().EndOfInvokeResponses().GetError());
ReturnErrorOnFailure(mInvokeResponseBuilder.EndOfInvokeResponseMessage().GetError());
MoveToState(State::AddedCommand);
return CHIP_NO_ERROR;
}
CHIP_ERROR CommandHandler::PrepareStatus(const ConcreteCommandPath & aCommandPath)
{
ReturnErrorOnFailure(AllocateBuffer());
//
// We must not be in the middle of preparing a command, or having prepared or sent one.
//
VerifyOrReturnError(mState == State::Idle, CHIP_ERROR_INCORRECT_STATE);
MoveToState(State::Preparing);
InvokeResponseIBs::Builder & invokeResponses = mInvokeResponseBuilder.GetInvokeResponses();
InvokeResponseIB::Builder & invokeResponse = invokeResponses.CreateInvokeResponse();
ReturnErrorOnFailure(invokeResponses.GetError());
CommandStatusIB::Builder & commandStatus = invokeResponse.CreateStatus();
ReturnErrorOnFailure(commandStatus.GetError());
CommandPathIB::Builder & path = commandStatus.CreatePath();
ReturnErrorOnFailure(commandStatus.GetError());
ReturnErrorOnFailure(path.Encode(aCommandPath));
MoveToState(State::AddingCommand);
return CHIP_NO_ERROR;
}
CHIP_ERROR CommandHandler::FinishStatus()
{
VerifyOrReturnError(mState == State::AddingCommand, CHIP_ERROR_INCORRECT_STATE);
ReturnErrorOnFailure(
mInvokeResponseBuilder.GetInvokeResponses().GetInvokeResponse().GetStatus().EndOfCommandStatusIB().GetError());
ReturnErrorOnFailure(mInvokeResponseBuilder.GetInvokeResponses().GetInvokeResponse().EndOfInvokeResponseIB().GetError());
ReturnErrorOnFailure(mInvokeResponseBuilder.GetInvokeResponses().EndOfInvokeResponses().GetError());
ReturnErrorOnFailure(mInvokeResponseBuilder.EndOfInvokeResponseMessage().GetError());
MoveToState(State::AddedCommand);
return CHIP_NO_ERROR;
}
CHIP_ERROR CommandHandler::RollbackResponse()
{
VerifyOrReturnError(mState == State::Preparing || mState == State::AddingCommand, CHIP_ERROR_INCORRECT_STATE);
mInvokeResponseBuilder.Rollback(mBackupWriter);
mInvokeResponseBuilder.ResetError();
// Note: We only support one command per request, so we reset the state to Idle here, need to review the states when adding
// supports of having multiple requests in the same transaction.
MoveToState(State::Idle);
return CHIP_NO_ERROR;
}
TLV::TLVWriter * CommandHandler::GetCommandDataIBTLVWriter()
{
if (mState != State::AddingCommand)
{
return nullptr;
}
return mInvokeResponseBuilder.GetInvokeResponses().GetInvokeResponse().GetCommand().GetWriter();
}
FabricIndex CommandHandler::GetAccessingFabricIndex() const
{
return mExchangeCtx->GetSessionHandle()->GetFabricIndex();
}
CommandHandler * CommandHandler::Handle::Get()
{
// Not safe to work with CommandHandler in parallel with other Matter work.
assertChipStackLockedByCurrentThread();
return (mMagic == InteractionModelEngine::GetInstance()->GetMagicNumber()) ? mpHandler : nullptr;
}
void CommandHandler::Handle::Release()
{
if (mpHandler != nullptr)
{
if (mMagic == InteractionModelEngine::GetInstance()->GetMagicNumber())
{
mpHandler->DecrementHoldOff();
}
mpHandler = nullptr;
mMagic = 0;
}
}
CommandHandler::Handle::Handle(CommandHandler * handle)
{
if (handle != nullptr)
{
handle->IncrementHoldOff();
mpHandler = handle;
mMagic = InteractionModelEngine::GetInstance()->GetMagicNumber();
}
}
CHIP_ERROR CommandHandler::Finalize(System::PacketBufferHandle & commandPacket)
{
VerifyOrReturnError(mState == State::AddedCommand, CHIP_ERROR_INCORRECT_STATE);
return mCommandMessageWriter.Finalize(&commandPacket);
}
const char * CommandHandler::GetStateStr() const
{
#if CHIP_DETAIL_LOGGING
switch (mState)
{
case State::Idle:
return "Idle";
case State::Preparing:
return "Preparing";
case State::AddingCommand:
return "AddingCommand";
case State::AddedCommand:
return "AddedCommand";
case State::CommandSent:
return "CommandSent";
case State::AwaitingDestruction:
return "AwaitingDestruction";
}
#endif // CHIP_DETAIL_LOGGING
return "N/A";
}
void CommandHandler::MoveToState(const State aTargetState)
{
mState = aTargetState;
ChipLogDetail(DataManagement, "Command handler moving to [%10.10s]", GetStateStr());
}
} // namespace app
} // namespace chip
CHIP_ERROR __attribute__((weak)) MatterPreCommandReceivedCallback(const chip::app::ConcreteCommandPath & commandPath,
const chip::Access::SubjectDescriptor & subjectDescriptor)
{
return CHIP_NO_ERROR;
}
void __attribute__((weak)) MatterPostCommandReceivedCallback(const chip::app::ConcreteCommandPath & commandPath,
const chip::Access::SubjectDescriptor & subjectDescriptor)
{}