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pigweed / third_party / github / project-chip / connectedhomeip / 6090618624187d2d05cad9b741534b8bb1832fe2 / . / src / app / InteractionModelEngine.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 defines objects for a CHIP Interaction Data model Engine which handle unsolicited IM message, and
* manage different kinds of IM client and handlers.
*
*/
#include "InteractionModelEngine.h"
#include <cinttypes>
#include "access/RequestPath.h"
#include "access/SubjectDescriptor.h"
#include <app/AppConfig.h>
#include <app/RequiredPrivilege.h>
#include <app/util/IMClusterCommandHandler.h>
#include <app/util/af-types.h>
#include <app/util/ember-compatibility-functions.h>
#include <app/util/endpoint-config-api.h>
#include <lib/core/Global.h>
#include <lib/core/TLVUtilities.h>
#include <lib/support/CHIPFaultInjection.h>
#include <lib/support/CodeUtils.h>
#include <lib/support/FibonacciUtils.h>
namespace chip {
namespace app {
class AutoReleaseSubscriptionInfoIterator
{
public:
AutoReleaseSubscriptionInfoIterator(SubscriptionResumptionStorage::SubscriptionInfoIterator * iterator) : mIterator(iterator){};
~AutoReleaseSubscriptionInfoIterator() { mIterator->Release(); }
SubscriptionResumptionStorage::SubscriptionInfoIterator * operator->() const { return mIterator; }
private:
SubscriptionResumptionStorage::SubscriptionInfoIterator * mIterator;
};
using Protocols::InteractionModel::Status;
Global<InteractionModelEngine> sInteractionModelEngine;
InteractionModelEngine::InteractionModelEngine() : mReportingEngine(this) {}
InteractionModelEngine * InteractionModelEngine::GetInstance()
{
return &sInteractionModelEngine.get();
}
CHIP_ERROR InteractionModelEngine::Init(Messaging::ExchangeManager * apExchangeMgr, FabricTable * apFabricTable,
reporting::ReportScheduler * reportScheduler, CASESessionManager * apCASESessionMgr,
SubscriptionResumptionStorage * subscriptionResumptionStorage)
{
VerifyOrReturnError(apFabricTable != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(apExchangeMgr != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(reportScheduler != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
mpExchangeMgr = apExchangeMgr;
mpFabricTable = apFabricTable;
mpCASESessionMgr = apCASESessionMgr;
mpSubscriptionResumptionStorage = subscriptionResumptionStorage;
mReportScheduler = reportScheduler;
ReturnErrorOnFailure(mpFabricTable->AddFabricDelegate(this));
ReturnErrorOnFailure(mpExchangeMgr->RegisterUnsolicitedMessageHandlerForProtocol(Protocols::InteractionModel::Id, this));
mReportingEngine.Init();
StatusIB::RegisterErrorFormatter();
return CHIP_NO_ERROR;
}
void InteractionModelEngine::Shutdown()
{
mpExchangeMgr->GetSessionManager()->SystemLayer()->CancelTimer(ResumeSubscriptionsTimerCallback, this);
CommandHandlerInterface * handlerIter = mCommandHandlerList;
//
// Walk our list of command handlers and de-register them, before finally
// nulling out the list entirely.
//
while (handlerIter)
{
CommandHandlerInterface * nextHandler = handlerIter->GetNext();
handlerIter->SetNext(nullptr);
handlerIter = nextHandler;
}
mCommandHandlerList = nullptr;
mCommandResponderObjs.ReleaseAll();
mTimedHandlers.ForEachActiveObject([this](TimedHandler * obj) -> Loop {
mpExchangeMgr->CloseAllContextsForDelegate(obj);
return Loop::Continue;
});
mTimedHandlers.ReleaseAll();
mReadHandlers.ReleaseAll();
#if CHIP_CONFIG_ENABLE_READ_CLIENT
// Shut down any subscription clients that are still around. They won't be
// able to work after this point anyway, since we're about to drop our refs
// to them.
ShutdownAllSubscriptions();
//
// We hold weak references to ReadClient objects. The application ultimately
// actually owns them, so it's on them to eventually shut them down and free them
// up.
//
// However, we should null out their pointers back to us at the very least so that
// at destruction time, they won't attempt to reach back here to remove themselves
// from this list.
//
for (auto * readClient = mpActiveReadClientList; readClient != nullptr;)
{
readClient->mpImEngine = nullptr;
auto * tmpClient = readClient->GetNextClient();
readClient->SetNextClient(nullptr);
readClient = tmpClient;
}
//
// After that, we just null out our tracker.
//
mpActiveReadClientList = nullptr;
#endif // CHIP_CONFIG_ENABLE_READ_CLIENT
for (auto & writeHandler : mWriteHandlers)
{
if (!writeHandler.IsFree())
{
writeHandler.Close();
}
}
mReportingEngine.Shutdown();
mAttributePathPool.ReleaseAll();
mEventPathPool.ReleaseAll();
mDataVersionFilterPool.ReleaseAll();
mpExchangeMgr->UnregisterUnsolicitedMessageHandlerForProtocol(Protocols::InteractionModel::Id);
mpCASESessionMgr = nullptr;
//
// We _should_ be clearing these out, but doing so invites a world
// of trouble. #21233 tracks fixing the underlying assumptions to make
// this possible.
//
// mpFabricTable = nullptr;
// mpExchangeMgr = nullptr;
}
uint32_t InteractionModelEngine::GetNumActiveReadHandlers() const
{
return static_cast<uint32_t>(mReadHandlers.Allocated());
}
uint32_t InteractionModelEngine::GetNumActiveReadHandlers(ReadHandler::InteractionType aType) const
{
uint32_t count = 0;
mReadHandlers.ForEachActiveObject([aType, &count](const ReadHandler * handler) {
if (handler->IsType(aType))
{
count++;
}
return Loop::Continue;
});
return count;
}
uint32_t InteractionModelEngine::GetNumActiveReadHandlers(ReadHandler::InteractionType aType, FabricIndex aFabricIndex) const
{
uint32_t count = 0;
mReadHandlers.ForEachActiveObject([aType, aFabricIndex, &count](const ReadHandler * handler) {
if (handler->IsType(aType) && handler->GetAccessingFabricIndex() == aFabricIndex)
{
count++;
}
return Loop::Continue;
});
return count;
}
ReadHandler * InteractionModelEngine::ActiveHandlerAt(unsigned int aIndex)
{
if (aIndex >= mReadHandlers.Allocated())
{
return nullptr;
}
unsigned int i = 0;
ReadHandler * ret = nullptr;
mReadHandlers.ForEachActiveObject([aIndex, &i, &ret](ReadHandler * handler) {
if (i == aIndex)
{
ret = handler;
return Loop::Break;
}
i++;
return Loop::Continue;
});
return ret;
}
WriteHandler * InteractionModelEngine::ActiveWriteHandlerAt(unsigned int aIndex)
{
unsigned int i = 0;
for (auto & writeHandler : mWriteHandlers)
{
if (!writeHandler.IsFree())
{
if (i == aIndex)
{
return &writeHandler;
}
i++;
}
}
return nullptr;
}
uint32_t InteractionModelEngine::GetNumActiveWriteHandlers() const
{
uint32_t numActive = 0;
for (auto & writeHandler : mWriteHandlers)
{
if (!writeHandler.IsFree())
{
numActive++;
}
}
return numActive;
}
#if CHIP_CONFIG_ENABLE_READ_CLIENT
CHIP_ERROR InteractionModelEngine::ShutdownSubscription(const ScopedNodeId & aPeerNodeId, SubscriptionId aSubscriptionId)
{
assertChipStackLockedByCurrentThread();
for (auto * readClient = mpActiveReadClientList; readClient != nullptr;)
{
// Grab the next client now, because we might be about to delete readClient.
auto * nextClient = readClient->GetNextClient();
if (readClient->IsSubscriptionType() && readClient->IsMatchingSubscriptionId(aSubscriptionId) &&
readClient->GetFabricIndex() == aPeerNodeId.GetFabricIndex() && readClient->GetPeerNodeId() == aPeerNodeId.GetNodeId())
{
readClient->Close(CHIP_NO_ERROR);
return CHIP_NO_ERROR;
}
readClient = nextClient;
}
return CHIP_ERROR_KEY_NOT_FOUND;
}
void InteractionModelEngine::ShutdownSubscriptions(FabricIndex aFabricIndex, NodeId aPeerNodeId)
{
assertChipStackLockedByCurrentThread();
ShutdownMatchingSubscriptions(MakeOptional(aFabricIndex), MakeOptional(aPeerNodeId));
}
void InteractionModelEngine::ShutdownSubscriptions(FabricIndex aFabricIndex)
{
assertChipStackLockedByCurrentThread();
ShutdownMatchingSubscriptions(MakeOptional(aFabricIndex));
}
void InteractionModelEngine::ShutdownAllSubscriptions()
{
assertChipStackLockedByCurrentThread();
ShutdownMatchingSubscriptions();
}
void InteractionModelEngine::ShutdownMatchingSubscriptions(const Optional<FabricIndex> & aFabricIndex,
const Optional<NodeId> & aPeerNodeId)
{
// This is assuming that ReadClient::Close will not affect any other
// ReadClients in the list.
for (auto * readClient = mpActiveReadClientList; readClient != nullptr;)
{
// Grab the next client now, because we might be about to delete readClient.
auto * nextClient = readClient->GetNextClient();
if (readClient->IsSubscriptionType())
{
bool fabricMatches = !aFabricIndex.HasValue() || (aFabricIndex.Value() == readClient->GetFabricIndex());
bool nodeIdMatches = !aPeerNodeId.HasValue() || (aPeerNodeId.Value() == readClient->GetPeerNodeId());
if (fabricMatches && nodeIdMatches)
{
readClient->Close(CHIP_NO_ERROR);
}
}
readClient = nextClient;
}
}
#endif // CHIP_CONFIG_ENABLE_READ_CLIENT
bool InteractionModelEngine::SubjectHasActiveSubscription(FabricIndex aFabricIndex, NodeId subjectID)
{
bool isActive = false;
mReadHandlers.ForEachActiveObject([aFabricIndex, subjectID, &isActive](ReadHandler * handler) {
VerifyOrReturnValue(handler->IsType(ReadHandler::InteractionType::Subscribe), Loop::Continue);
Access::SubjectDescriptor subject = handler->GetSubjectDescriptor();
VerifyOrReturnValue(subject.fabricIndex == aFabricIndex, Loop::Continue);
if (subject.authMode == Access::AuthMode::kCase)
{
if (subject.cats.CheckSubjectAgainstCATs(subjectID) || subjectID == subject.subject)
{
isActive = handler->IsActiveSubscription();
// Exit loop only if isActive is set to true.
// Otherwise keep looking for another subscription that could match the subject.
VerifyOrReturnValue(!isActive, Loop::Break);
}
}
return Loop::Continue;
});
return isActive;
}
bool InteractionModelEngine::SubjectHasPersistedSubscription(FabricIndex aFabricIndex, NodeId subjectID)
{
bool persistedSubMatches = false;
#if CHIP_CONFIG_PERSIST_SUBSCRIPTIONS
auto * iterator = mpSubscriptionResumptionStorage->IterateSubscriptions();
// Verify that we were able to allocate an iterator. If not, we are probably currently trying to resubscribe to our persisted
// subscriptions. As such, we assume we have a persisted subscription and return true.
// If we don't have a persisted subscription for the given fabric index and subjectID, we will send a Check-In message next time
// we transition to ActiveMode.
VerifyOrReturnValue(iterator, true);
SubscriptionResumptionStorage::SubscriptionInfo subscriptionInfo;
while (iterator->Next(subscriptionInfo))
{
// TODO(#31873): Persistent subscription only stores the NodeID for now. We cannot check if the CAT matches
if (subscriptionInfo.mFabricIndex == aFabricIndex && subscriptionInfo.mNodeId == subjectID)
{
persistedSubMatches = true;
break;
}
}
iterator->Release();
#endif // CHIP_CONFIG_PERSIST_SUBSCRIPTIONS
return persistedSubMatches;
}
void InteractionModelEngine::OnDone(CommandResponseSender & apResponderObj)
{
mCommandResponderObjs.ReleaseObject(&apResponderObj);
}
// TODO(#30453): Follow up refactor. Remove need for InteractionModelEngine::OnDone(CommandHandler).
void InteractionModelEngine::OnDone(CommandHandler & apCommandObj)
{
// We are no longer expecting to receive this callback. With the introduction of CommandResponseSender, it is now
// responsible for receiving this callback.
VerifyOrDie(false);
}
void InteractionModelEngine::OnDone(ReadHandler & apReadObj)
{
//
// Deleting an item can shift down the contents of the underlying pool storage,
// rendering any tracker using positional indexes invalid. Let's reset it,
// based on which readHandler we are getting rid of.
//
mReportingEngine.ResetReadHandlerTracker(&apReadObj);
mReadHandlers.ReleaseObject(&apReadObj);
TryToResumeSubscriptions();
}
void InteractionModelEngine::TryToResumeSubscriptions()
{
#if CHIP_CONFIG_PERSIST_SUBSCRIPTIONS && CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
if (!mSubscriptionResumptionScheduled && HasSubscriptionsToResume())
{
mSubscriptionResumptionScheduled = true;
auto timeTillNextSubscriptionResumptionSecs = ComputeTimeSecondsTillNextSubscriptionResumption();
mpExchangeMgr->GetSessionManager()->SystemLayer()->StartTimer(
System::Clock::Seconds32(timeTillNextSubscriptionResumptionSecs), ResumeSubscriptionsTimerCallback, this);
mNumSubscriptionResumptionRetries++;
ChipLogProgress(InteractionModel, "Schedule subscription resumption when failing to establish session, Retries: %" PRIu32,
mNumSubscriptionResumptionRetries);
}
#endif // CHIP_CONFIG_PERSIST_SUBSCRIPTIONS && CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
}
Status InteractionModelEngine::OnInvokeCommandRequest(Messaging::ExchangeContext * apExchangeContext,
const PayloadHeader & aPayloadHeader, System::PacketBufferHandle && aPayload,
bool aIsTimedInvoke)
{
// TODO(#30453): Refactor CommandResponseSender's constructor to accept an exchange context parameter.
CommandResponseSender * commandResponder = mCommandResponderObjs.CreateObject(this, this);
if (commandResponder == nullptr)
{
ChipLogProgress(InteractionModel, "no resource for Invoke interaction");
return Status::Busy;
}
CHIP_FAULT_INJECT(
FaultInjection::kFault_IMInvoke_SeparateResponses,
commandResponder->TestOnlyInvokeCommandRequestWithFaultsInjected(
apExchangeContext, std::move(aPayload), aIsTimedInvoke, CommandHandler::NlFaultInjectionType::SeparateResponseMessages);
return Status::Success;);
CHIP_FAULT_INJECT(FaultInjection::kFault_IMInvoke_SeparateResponsesInvertResponseOrder,
commandResponder->TestOnlyInvokeCommandRequestWithFaultsInjected(
apExchangeContext, std::move(aPayload), aIsTimedInvoke,
CommandHandler::NlFaultInjectionType::SeparateResponseMessagesAndInvertedResponseOrder);
return Status::Success;);
CHIP_FAULT_INJECT(
FaultInjection::kFault_IMInvoke_SkipSecondResponse,
commandResponder->TestOnlyInvokeCommandRequestWithFaultsInjected(apExchangeContext, std::move(aPayload), aIsTimedInvoke,
CommandHandler::NlFaultInjectionType::SkipSecondResponse);
return Status::Success;);
commandResponder->OnInvokeCommandRequest(apExchangeContext, std::move(aPayload), aIsTimedInvoke);
return Status::Success;
}
CHIP_ERROR InteractionModelEngine::ParseAttributePaths(const Access::SubjectDescriptor & aSubjectDescriptor,
AttributePathIBs::Parser & aAttributePathListParser,
bool & aHasValidAttributePath, size_t & aRequestedAttributePathCount)
{
TLV::TLVReader pathReader;
aAttributePathListParser.GetReader(&pathReader);
CHIP_ERROR err = CHIP_NO_ERROR;
aHasValidAttributePath = false;
aRequestedAttributePathCount = 0;
while (CHIP_NO_ERROR == (err = pathReader.Next(TLV::AnonymousTag())))
{
AttributePathIB::Parser path;
//
// We create an iterator to point to a single item object list that tracks the path we just parsed.
// This avoids the 'parse all paths' approach that is employed in ReadHandler since we want to
// avoid allocating out of the path store during this minimal initial processing stage.
//
SingleLinkedListNode<AttributePathParams> paramsList;
ReturnErrorOnFailure(path.Init(pathReader));
ReturnErrorOnFailure(path.ParsePath(paramsList.mValue));
if (paramsList.mValue.IsWildcardPath())
{
AttributePathExpandIterator pathIterator(&paramsList);
ConcreteAttributePath readPath;
// The definition of "valid path" is "path exists and ACL allows access". The "path exists" part is handled by
// AttributePathExpandIterator. So we just need to check the ACL bits.
for (; pathIterator.Get(readPath); pathIterator.Next())
{
Access::RequestPath requestPath{ .cluster = readPath.mClusterId, .endpoint = readPath.mEndpointId };
err = Access::GetAccessControl().Check(aSubjectDescriptor, requestPath,
RequiredPrivilege::ForReadAttribute(readPath));
if (err == CHIP_NO_ERROR)
{
aHasValidAttributePath = true;
break;
}
}
}
else
{
ConcreteAttributePath concretePath(paramsList.mValue.mEndpointId, paramsList.mValue.mClusterId,
paramsList.mValue.mAttributeId);
if (ConcreteAttributePathExists(concretePath))
{
Access::RequestPath requestPath{ .cluster = concretePath.mClusterId, .endpoint = concretePath.mEndpointId };
err = Access::GetAccessControl().Check(aSubjectDescriptor, requestPath,
RequiredPrivilege::ForReadAttribute(concretePath));
if (err == CHIP_NO_ERROR)
{
aHasValidAttributePath = true;
}
}
}
aRequestedAttributePathCount++;
}
if (err == CHIP_ERROR_END_OF_TLV)
{
err = CHIP_NO_ERROR;
}
return err;
}
static bool CanAccess(const Access::SubjectDescriptor & aSubjectDescriptor, const ConcreteClusterPath & aPath,
Access::Privilege aNeededPrivilege)
{
Access::RequestPath requestPath{ .cluster = aPath.mClusterId, .endpoint = aPath.mEndpointId };
CHIP_ERROR err = Access::GetAccessControl().Check(aSubjectDescriptor, requestPath, aNeededPrivilege);
return (err == CHIP_NO_ERROR);
}
static bool CanAccess(const Access::SubjectDescriptor & aSubjectDescriptor, const ConcreteEventPath & aPath)
{
return CanAccess(aSubjectDescriptor, aPath, RequiredPrivilege::ForReadEvent(aPath));
}
/**
* Helper to handle wildcard events in the event path.
*/
static bool HasValidEventPathForEndpointAndCluster(EndpointId aEndpoint, const EmberAfCluster * aCluster,
const EventPathParams & aEventPath,
const Access::SubjectDescriptor & aSubjectDescriptor)
{
if (aEventPath.HasWildcardEventId())
{
#if CHIP_CONFIG_ENABLE_EVENTLIST_ATTRIBUTE
for (decltype(aCluster->eventCount) idx = 0; idx < aCluster->eventCount; ++idx)
{
ConcreteEventPath path(aEndpoint, aCluster->clusterId, aCluster->eventList[idx]);
// If we get here, the path exists. We just have to do an ACL check for it.
bool isValid = CanAccess(aSubjectDescriptor, path);
if (isValid)
{
return true;
}
}
return false;
#else
// We have no way to expand wildcards. Just assume that we would need
// View permissions for whatever events are involved.
ConcreteClusterPath clusterPath(aEndpoint, aCluster->clusterId);
return CanAccess(aSubjectDescriptor, clusterPath, Access::Privilege::kView);
#endif
}
ConcreteEventPath path(aEndpoint, aCluster->clusterId, aEventPath.mEventId);
if (CheckEventSupportStatus(path) != Status::Success)
{
// Not an existing event path.
return false;
}
return CanAccess(aSubjectDescriptor, path);
}
/**
* Helper to handle wildcard clusters in the event path.
*/
static bool HasValidEventPathForEndpoint(EndpointId aEndpoint, const EventPathParams & aEventPath,
const Access::SubjectDescriptor & aSubjectDescriptor)
{
if (aEventPath.HasWildcardClusterId())
{
auto * endpointType = emberAfFindEndpointType(aEndpoint);
if (endpointType == nullptr)
{
// Not going to have any valid paths in here.
return false;
}
for (decltype(endpointType->clusterCount) idx = 0; idx < endpointType->clusterCount; ++idx)
{
bool hasValidPath =
HasValidEventPathForEndpointAndCluster(aEndpoint, &endpointType->cluster[idx], aEventPath, aSubjectDescriptor);
if (hasValidPath)
{
return true;
}
}
return false;
}
auto * cluster = emberAfFindServerCluster(aEndpoint, aEventPath.mClusterId);
if (cluster == nullptr)
{
// Nothing valid here.
return false;
}
return HasValidEventPathForEndpointAndCluster(aEndpoint, cluster, aEventPath, aSubjectDescriptor);
}
CHIP_ERROR InteractionModelEngine::ParseEventPaths(const Access::SubjectDescriptor & aSubjectDescriptor,
EventPathIBs::Parser & aEventPathListParser, bool & aHasValidEventPath,
size_t & aRequestedEventPathCount)
{
TLV::TLVReader pathReader;
aEventPathListParser.GetReader(&pathReader);
CHIP_ERROR err = CHIP_NO_ERROR;
aHasValidEventPath = false;
aRequestedEventPathCount = 0;
while (CHIP_NO_ERROR == (err = pathReader.Next(TLV::AnonymousTag())))
{
EventPathIB::Parser path;
ReturnErrorOnFailure(path.Init(pathReader));
EventPathParams eventPath;
ReturnErrorOnFailure(path.ParsePath(eventPath));
++aRequestedEventPathCount;
if (aHasValidEventPath)
{
// Can skip all the rest of the checking.
continue;
}
// The definition of "valid path" is "path exists and ACL allows
// access". We need to do some expansion of wildcards to handle that.
if (eventPath.HasWildcardEndpointId())
{
for (uint16_t endpointIndex = 0; !aHasValidEventPath && endpointIndex < emberAfEndpointCount(); ++endpointIndex)
{
if (!emberAfEndpointIndexIsEnabled(endpointIndex))
{
continue;
}
aHasValidEventPath =
HasValidEventPathForEndpoint(emberAfEndpointFromIndex(endpointIndex), eventPath, aSubjectDescriptor);
}
}
else
{
// No need to check whether the endpoint is enabled, because
// emberAfFindEndpointType returns null for disabled endpoints.
aHasValidEventPath = HasValidEventPathForEndpoint(eventPath.mEndpointId, eventPath, aSubjectDescriptor);
}
}
if (err == CHIP_ERROR_END_OF_TLV)
{
err = CHIP_NO_ERROR;
}
return err;
}
Protocols::InteractionModel::Status InteractionModelEngine::OnReadInitialRequest(Messaging::ExchangeContext * apExchangeContext,
const PayloadHeader & aPayloadHeader,
System::PacketBufferHandle && aPayload,
ReadHandler::InteractionType aInteractionType)
{
ChipLogDetail(InteractionModel, "Received %s request",
aInteractionType == ReadHandler::InteractionType::Subscribe ? "Subscribe" : "Read");
//
// Let's first figure out if the client has sent us a subscribe request and requested we keep any existing
// subscriptions from that source.
//
if (aInteractionType == ReadHandler::InteractionType::Subscribe)
{
System::PacketBufferTLVReader reader;
bool keepExistingSubscriptions = true;
if (apExchangeContext->GetSessionHandle()->GetFabricIndex() == kUndefinedFabricIndex)
{
// Subscriptions must be associated to a fabric.
return Status::UnsupportedAccess;
}
reader.Init(aPayload.Retain());
SubscribeRequestMessage::Parser subscribeRequestParser;
VerifyOrReturnError(subscribeRequestParser.Init(reader) == CHIP_NO_ERROR, Status::InvalidAction);
#if CHIP_CONFIG_IM_PRETTY_PRINT
subscribeRequestParser.PrettyPrint();
#endif
VerifyOrReturnError(subscribeRequestParser.GetKeepSubscriptions(&keepExistingSubscriptions) == CHIP_NO_ERROR,
Status::InvalidAction);
if (!keepExistingSubscriptions)
{
//
// Walk through all existing subscriptions and shut down those whose subscriber matches
// that which just came in.
//
mReadHandlers.ForEachActiveObject([apExchangeContext](ReadHandler * handler) {
if (handler->IsFromSubscriber(*apExchangeContext))
{
ChipLogProgress(InteractionModel,
"Deleting previous subscription from NodeId: " ChipLogFormatX64 ", FabricIndex: %u",
ChipLogValueX64(apExchangeContext->GetSessionHandle()->AsSecureSession()->GetPeerNodeId()),
apExchangeContext->GetSessionHandle()->GetFabricIndex());
handler->Close();
}
return Loop::Continue;
});
}
{
size_t requestedAttributePathCount = 0;
size_t requestedEventPathCount = 0;
AttributePathIBs::Parser attributePathListParser;
bool hasValidAttributePath = false;
bool hasValidEventPath = false;
CHIP_ERROR err = subscribeRequestParser.GetAttributeRequests(&attributePathListParser);
if (err == CHIP_NO_ERROR)
{
auto subjectDescriptor = apExchangeContext->GetSessionHandle()->AsSecureSession()->GetSubjectDescriptor();
err = ParseAttributePaths(subjectDescriptor, attributePathListParser, hasValidAttributePath,
requestedAttributePathCount);
if (err != CHIP_NO_ERROR)
{
return Status::InvalidAction;
}
}
else if (err != CHIP_ERROR_END_OF_TLV)
{
return Status::InvalidAction;
}
EventPathIBs::Parser eventPathListParser;
err = subscribeRequestParser.GetEventRequests(&eventPathListParser);
if (err == CHIP_NO_ERROR)
{
auto subjectDescriptor = apExchangeContext->GetSessionHandle()->AsSecureSession()->GetSubjectDescriptor();
err = ParseEventPaths(subjectDescriptor, eventPathListParser, hasValidEventPath, requestedEventPathCount);
if (err != CHIP_NO_ERROR)
{
return Status::InvalidAction;
}
}
else if (err != CHIP_ERROR_END_OF_TLV)
{
return Status::InvalidAction;
}
if (requestedAttributePathCount == 0 && requestedEventPathCount == 0)
{
ChipLogError(InteractionModel,
"Subscription from [%u:" ChipLogFormatX64 "] has no attribute or event paths. Rejecting request.",
apExchangeContext->GetSessionHandle()->GetFabricIndex(),
ChipLogValueX64(apExchangeContext->GetSessionHandle()->AsSecureSession()->GetPeerNodeId()));
return Status::InvalidAction;
}
if (!hasValidAttributePath && !hasValidEventPath)
{
ChipLogError(InteractionModel,
"Subscription from [%u:" ChipLogFormatX64 "] has no access at all. Rejecting request.",
apExchangeContext->GetSessionHandle()->GetFabricIndex(),
ChipLogValueX64(apExchangeContext->GetSessionHandle()->AsSecureSession()->GetPeerNodeId()));
return Status::InvalidAction;
}
// The following cast is safe, since we can only hold a few tens of paths in one request.
if (!EnsureResourceForSubscription(apExchangeContext->GetSessionHandle()->GetFabricIndex(), requestedAttributePathCount,
requestedEventPathCount))
{
return Status::PathsExhausted;
}
}
}
else
{
System::PacketBufferTLVReader reader;
reader.Init(aPayload.Retain());
ReadRequestMessage::Parser readRequestParser;
VerifyOrReturnError(readRequestParser.Init(reader) == CHIP_NO_ERROR, Status::InvalidAction);
#if CHIP_CONFIG_IM_PRETTY_PRINT
readRequestParser.PrettyPrint();
#endif
{
size_t requestedAttributePathCount = 0;
size_t requestedEventPathCount = 0;
AttributePathIBs::Parser attributePathListParser;
CHIP_ERROR err = readRequestParser.GetAttributeRequests(&attributePathListParser);
if (err == CHIP_NO_ERROR)
{
TLV::TLVReader pathReader;
attributePathListParser.GetReader(&pathReader);
ReturnErrorCodeIf(TLV::Utilities::Count(pathReader, requestedAttributePathCount, false) != CHIP_NO_ERROR,
Status::InvalidAction);
}
else if (err != CHIP_ERROR_END_OF_TLV)
{
return Status::InvalidAction;
}
EventPathIBs::Parser eventpathListParser;
err = readRequestParser.GetEventRequests(&eventpathListParser);
if (err == CHIP_NO_ERROR)
{
TLV::TLVReader pathReader;
eventpathListParser.GetReader(&pathReader);
ReturnErrorCodeIf(TLV::Utilities::Count(pathReader, requestedEventPathCount, false) != CHIP_NO_ERROR,
Status::InvalidAction);
}
else if (err != CHIP_ERROR_END_OF_TLV)
{
return Status::InvalidAction;
}
// The following cast is safe, since we can only hold a few tens of paths in one request.
Status checkResult = EnsureResourceForRead(apExchangeContext->GetSessionHandle()->GetFabricIndex(),
requestedAttributePathCount, requestedEventPathCount);
if (checkResult != Status::Success)
{
return checkResult;
}
}
}
// We have already reserved enough resources for read requests, and have granted enough resources for current subscriptions, so
// we should be able to allocate resources requested by this request.
ReadHandler * handler = mReadHandlers.CreateObject(*this, apExchangeContext, aInteractionType, mReportScheduler);
if (handler == nullptr)
{
ChipLogProgress(InteractionModel, "no resource for %s interaction",
aInteractionType == ReadHandler::InteractionType::Subscribe ? "Subscribe" : "Read");
return Status::ResourceExhausted;
}
handler->OnInitialRequest(std::move(aPayload));
return Status::Success;
}
Protocols::InteractionModel::Status InteractionModelEngine::OnWriteRequest(Messaging::ExchangeContext * apExchangeContext,
const PayloadHeader & aPayloadHeader,
System::PacketBufferHandle && aPayload,
bool aIsTimedWrite)
{
ChipLogDetail(InteractionModel, "Received Write request");
for (auto & writeHandler : mWriteHandlers)
{
if (writeHandler.IsFree())
{
VerifyOrReturnError(writeHandler.Init() == CHIP_NO_ERROR, Status::Busy);
return writeHandler.OnWriteRequest(apExchangeContext, std::move(aPayload), aIsTimedWrite);
}
}
ChipLogProgress(InteractionModel, "no resource for write interaction");
return Status::Busy;
}
CHIP_ERROR InteractionModelEngine::OnTimedRequest(Messaging::ExchangeContext * apExchangeContext,
const PayloadHeader & aPayloadHeader, System::PacketBufferHandle && aPayload,
Protocols::InteractionModel::Status & aStatus)
{
TimedHandler * handler = mTimedHandlers.CreateObject(this);
if (handler == nullptr)
{
ChipLogProgress(InteractionModel, "no resource for Timed interaction");
aStatus = Status::Busy;
return CHIP_ERROR_NO_MEMORY;
}
// The timed handler takes over handling of this exchange and will do its
// own status reporting as needed.
aStatus = Status::Success;
apExchangeContext->SetDelegate(handler);
return handler->OnMessageReceived(apExchangeContext, aPayloadHeader, std::move(aPayload));
}
#if CHIP_CONFIG_ENABLE_READ_CLIENT
Status InteractionModelEngine::OnUnsolicitedReportData(Messaging::ExchangeContext * apExchangeContext,
const PayloadHeader & aPayloadHeader, System::PacketBufferHandle && aPayload)
{
System::PacketBufferTLVReader reader;
reader.Init(aPayload.Retain());
ReportDataMessage::Parser report;
VerifyOrReturnError(report.Init(reader) == CHIP_NO_ERROR, Status::InvalidAction);
#if CHIP_CONFIG_IM_PRETTY_PRINT
report.PrettyPrint();
#endif
SubscriptionId subscriptionId = 0;
VerifyOrReturnError(report.GetSubscriptionId(&subscriptionId) == CHIP_NO_ERROR, Status::InvalidAction);
VerifyOrReturnError(report.ExitContainer() == CHIP_NO_ERROR, Status::InvalidAction);
ReadClient * foundSubscription = nullptr;
for (auto * readClient = mpActiveReadClientList; readClient != nullptr; readClient = readClient->GetNextClient())
{
auto peer = apExchangeContext->GetSessionHandle()->GetPeer();
if (readClient->GetFabricIndex() != peer.GetFabricIndex() || readClient->GetPeerNodeId() != peer.GetNodeId())
{
continue;
}
// Notify Subscriptions about incoming communication from node
readClient->OnUnsolicitedMessageFromPublisher();
if (!readClient->IsSubscriptionActive())
{
continue;
}
if (!readClient->IsMatchingSubscriptionId(subscriptionId))
{
continue;
}
if (!foundSubscription)
{
foundSubscription = readClient;
}
}
if (foundSubscription)
{
foundSubscription->OnUnsolicitedReportData(apExchangeContext, std::move(aPayload));
return Status::Success;
}
ChipLogDetail(InteractionModel, "Received report with invalid subscriptionId %" PRIu32, subscriptionId);
return Status::InvalidSubscription;
}
#endif // CHIP_CONFIG_ENABLE_READ_CLIENT
CHIP_ERROR InteractionModelEngine::OnUnsolicitedMessageReceived(const PayloadHeader & payloadHeader,
ExchangeDelegate *& newDelegate)
{
// TODO: Implement OnUnsolicitedMessageReceived, let messaging layer dispatch message to ReadHandler/ReadClient/TimedHandler
// directly.
newDelegate = this;
return CHIP_NO_ERROR;
}
CHIP_ERROR InteractionModelEngine::OnMessageReceived(Messaging::ExchangeContext * apExchangeContext,
const PayloadHeader & aPayloadHeader, System::PacketBufferHandle && aPayload)
{
using namespace Protocols::InteractionModel;
Protocols::InteractionModel::Status status = Status::Failure;
// Group Message can only be an InvokeCommandRequest or WriteRequest
if (apExchangeContext->IsGroupExchangeContext() &&
!aPayloadHeader.HasMessageType(Protocols::InteractionModel::MsgType::InvokeCommandRequest) &&
!aPayloadHeader.HasMessageType(Protocols::InteractionModel::MsgType::WriteRequest))
{
ChipLogProgress(InteractionModel, "Msg type %d not supported for group message", aPayloadHeader.GetMessageType());
return CHIP_NO_ERROR;
}
if (aPayloadHeader.HasMessageType(Protocols::InteractionModel::MsgType::InvokeCommandRequest))
{
status = OnInvokeCommandRequest(apExchangeContext, aPayloadHeader, std::move(aPayload), /* aIsTimedInvoke = */ false);
}
else if (aPayloadHeader.HasMessageType(Protocols::InteractionModel::MsgType::ReadRequest))
{
status = OnReadInitialRequest(apExchangeContext, aPayloadHeader, std::move(aPayload), ReadHandler::InteractionType::Read);
}
else if (aPayloadHeader.HasMessageType(Protocols::InteractionModel::MsgType::WriteRequest))
{
status = OnWriteRequest(apExchangeContext, aPayloadHeader, std::move(aPayload), /* aIsTimedWrite = */ false);
}
else if (aPayloadHeader.HasMessageType(Protocols::InteractionModel::MsgType::SubscribeRequest))
{
status =
OnReadInitialRequest(apExchangeContext, aPayloadHeader, std::move(aPayload), ReadHandler::InteractionType::Subscribe);
}
#if CHIP_CONFIG_ENABLE_READ_CLIENT
else if (aPayloadHeader.HasMessageType(Protocols::InteractionModel::MsgType::ReportData))
{
status = OnUnsolicitedReportData(apExchangeContext, aPayloadHeader, std::move(aPayload));
}
#endif // CHIP_CONFIG_ENABLE_READ_CLIENT
else if (aPayloadHeader.HasMessageType(MsgType::TimedRequest))
{
OnTimedRequest(apExchangeContext, aPayloadHeader, std::move(aPayload), status);
}
else
{
ChipLogProgress(InteractionModel, "Msg type %d not supported", aPayloadHeader.GetMessageType());
status = Status::InvalidAction;
}
if (status != Status::Success && !apExchangeContext->IsGroupExchangeContext())
{
return StatusResponse::Send(status, apExchangeContext, false /*aExpectResponse*/);
}
return CHIP_NO_ERROR;
}
void InteractionModelEngine::OnResponseTimeout(Messaging::ExchangeContext * ec)
{
ChipLogError(InteractionModel, "Time out! Failed to receive IM response from Exchange: " ChipLogFormatExchange,
ChipLogValueExchange(ec));
}
#if CHIP_CONFIG_ENABLE_READ_CLIENT
void InteractionModelEngine::OnActiveModeNotification(ScopedNodeId aPeer)
{
for (ReadClient * pListItem = mpActiveReadClientList; pListItem != nullptr;)
{
auto pNextItem = pListItem->GetNextClient();
// It is possible that pListItem is destroyed by the app in OnActiveModeNotification.
// Get the next item before invoking `OnActiveModeNotification`.
if (ScopedNodeId(pListItem->GetPeerNodeId(), pListItem->GetFabricIndex()) == aPeer)
{
pListItem->OnActiveModeNotification();
}
pListItem = pNextItem;
}
}
void InteractionModelEngine::OnPeerTypeChange(ScopedNodeId aPeer, ReadClient::PeerType aType)
{
// TODO: Follow up to use a iterator function to avoid copy/paste here.
for (ReadClient * pListItem = mpActiveReadClientList; pListItem != nullptr;)
{
// It is possible that pListItem is destroyed by the app in OnPeerTypeChange.
// Get the next item before invoking `OnPeerTypeChange`.
auto pNextItem = pListItem->GetNextClient();
if (ScopedNodeId(pListItem->GetPeerNodeId(), pListItem->GetFabricIndex()) == aPeer)
{
pListItem->OnPeerTypeChange(aType);
}
pListItem = pNextItem;
}
}
void InteractionModelEngine::AddReadClient(ReadClient * apReadClient)
{
apReadClient->SetNextClient(mpActiveReadClientList);
mpActiveReadClientList = apReadClient;
}
#endif // CHIP_CONFIG_ENABLE_READ_CLIENT
bool InteractionModelEngine::TrimFabricForSubscriptions(FabricIndex aFabricIndex, bool aForceEvict)
{
const size_t pathPoolCapacity = GetPathPoolCapacityForSubscriptions();
const size_t readHandlerPoolCapacity = GetReadHandlerPoolCapacityForSubscriptions();
uint8_t fabricCount = mpFabricTable->FabricCount();
size_t attributePathsSubscribedByCurrentFabric = 0;
size_t eventPathsSubscribedByCurrentFabric = 0;
size_t subscriptionsEstablishedByCurrentFabric = 0;
if (fabricCount == 0)
{
return false;
}
// Note: This is OK only when we have assumed the fabricCount is not zero. Should be revised when adding support to
// subscriptions on PASE sessions.
size_t perFabricPathCapacity = pathPoolCapacity / static_cast<size_t>(fabricCount);
size_t perFabricSubscriptionCapacity = readHandlerPoolCapacity / static_cast<size_t>(fabricCount);
ReadHandler * candidate = nullptr;
size_t candidateAttributePathsUsed = 0;
size_t candidateEventPathsUsed = 0;
// It is safe to use & here since this function will be called on current stack.
mReadHandlers.ForEachActiveObject([&](ReadHandler * handler) {
if (handler->GetAccessingFabricIndex() != aFabricIndex || !handler->IsType(ReadHandler::InteractionType::Subscribe))
{
return Loop::Continue;
}
size_t attributePathsUsed = handler->GetAttributePathCount();
size_t eventPathsUsed = handler->GetEventPathCount();
attributePathsSubscribedByCurrentFabric += attributePathsUsed;
eventPathsSubscribedByCurrentFabric += eventPathsUsed;
subscriptionsEstablishedByCurrentFabric++;
if (candidate == nullptr)
{
candidate = handler;
}
// This handler uses more resources than the one we picked before.
else if ((attributePathsUsed > perFabricPathCapacity || eventPathsUsed > perFabricPathCapacity) &&
(candidateAttributePathsUsed <= perFabricPathCapacity && candidateEventPathsUsed <= perFabricPathCapacity))
{
candidate = handler;
candidateAttributePathsUsed = attributePathsUsed;
candidateEventPathsUsed = eventPathsUsed;
}
// This handler is older than the one we picked before.
else if (handler->GetTransactionStartGeneration() < candidate->GetTransactionStartGeneration() &&
// And the level of resource usage is the same (both exceed or neither exceed)
((attributePathsUsed > perFabricPathCapacity || eventPathsUsed > perFabricPathCapacity) ==
(candidateAttributePathsUsed > perFabricPathCapacity || candidateEventPathsUsed > perFabricPathCapacity)))
{
candidate = handler;
}
return Loop::Continue;
});
if (candidate != nullptr &&
(aForceEvict || attributePathsSubscribedByCurrentFabric > perFabricPathCapacity ||
eventPathsSubscribedByCurrentFabric > perFabricPathCapacity ||
subscriptionsEstablishedByCurrentFabric > perFabricSubscriptionCapacity))
{
SubscriptionId subId;
candidate->GetSubscriptionId(subId);
ChipLogProgress(DataManagement, "Evicting Subscription ID %u:0x%" PRIx32, candidate->GetSubjectDescriptor().fabricIndex,
subId);
candidate->Close();
return true;
}
return false;
}
bool InteractionModelEngine::EnsureResourceForSubscription(FabricIndex aFabricIndex, size_t aRequestedAttributePathCount,
size_t aRequestedEventPathCount)
{
#if CHIP_SYSTEM_CONFIG_POOL_USE_HEAP && !CHIP_CONFIG_IM_FORCE_FABRIC_QUOTA_CHECK
#if CONFIG_BUILD_FOR_HOST_UNIT_TEST
const bool allowUnlimited = !mForceHandlerQuota;
#else // CONFIG_BUILD_FOR_HOST_UNIT_TEST
// If the resources are allocated on the heap, we should be able to handle as many Read / Subscribe requests as possible.
const bool allowUnlimited = true;
#endif // CONFIG_BUILD_FOR_HOST_UNIT_TEST
#else // CHIP_SYSTEM_CONFIG_POOL_USE_HEAP && !CHIP_CONFIG_IM_FORCE_FABRIC_QUOTA_CHECK
const bool allowUnlimited = false;
#endif // CHIP_SYSTEM_CONFIG_POOL_USE_HEAP && !CHIP_CONFIG_IM_FORCE_FABRIC_QUOTA_CHECK
// Don't couple with read requests, always reserve enough resource for read requests.
const size_t pathPoolCapacity = GetPathPoolCapacityForSubscriptions();
const size_t readHandlerPoolCapacity = GetReadHandlerPoolCapacityForSubscriptions();
// If we return early here, the compiler will complain about the unreachable code, so we add a always-true check.
const size_t attributePathCap = allowUnlimited ? SIZE_MAX : pathPoolCapacity;
const size_t eventPathCap = allowUnlimited ? SIZE_MAX : pathPoolCapacity;
const size_t readHandlerCap = allowUnlimited ? SIZE_MAX : readHandlerPoolCapacity;
size_t usedAttributePaths = 0;
size_t usedEventPaths = 0;
size_t usedReadHandlers = 0;
auto countResourceUsage = [&]() {
usedAttributePaths = 0;
usedEventPaths = 0;
usedReadHandlers = 0;
mReadHandlers.ForEachActiveObject([&](auto * handler) {
if (!handler->IsType(ReadHandler::InteractionType::Subscribe))
{
return Loop::Continue;
}
usedAttributePaths += handler->GetAttributePathCount();
usedEventPaths += handler->GetEventPathCount();
usedReadHandlers++;
return Loop::Continue;
});
};
countResourceUsage();
if (usedAttributePaths + aRequestedAttributePathCount <= attributePathCap &&
usedEventPaths + aRequestedEventPathCount <= eventPathCap && usedReadHandlers < readHandlerCap)
{
// We have enough resources, then we serve the requests in a best-effort manner.
return true;
}
if ((aRequestedAttributePathCount > kMinSupportedPathsPerSubscription &&
usedAttributePaths + aRequestedAttributePathCount > attributePathCap) ||
(aRequestedEventPathCount > kMinSupportedPathsPerSubscription && usedEventPaths + aRequestedEventPathCount > eventPathCap))
{
// We cannot offer enough resources, and the subscription is requesting more than the spec limit.
return false;
}
const auto evictAndUpdateResourceUsage = [&](FabricIndex fabricIndex, bool forceEvict) {
bool ret = TrimFabricForSubscriptions(fabricIndex, forceEvict);
countResourceUsage();
return ret;
};
//
// At this point, we have an inbound request that respects minimas but we still don't have enough resources to handle it. Which
// means that we definitely have handlers on existing fabrics that are over limits and need to evict at least one of them to
// make space.
//
// There might be cases that one fabric has lots of subscriptions with one interested path, while the other fabrics are not
// using excess resources. So we need to do this multiple times until we have enough room or no fabrics are using excess
// resources.
//
bool didEvictHandler = true;
while (didEvictHandler)
{
didEvictHandler = false;
for (const auto & fabric : *mpFabricTable)
{
// The resources are enough to serve this request, do not evict anything.
if (usedAttributePaths + aRequestedAttributePathCount <= attributePathCap &&
usedEventPaths + aRequestedEventPathCount <= eventPathCap && usedReadHandlers < readHandlerCap)
{
break;
}
didEvictHandler = didEvictHandler || evictAndUpdateResourceUsage(fabric.GetFabricIndex(), false);
}
}
// The above loop cannot guarantee the resources for the new subscriptions when the resource usage from all fabrics are exactly
// within the quota (which means we have exactly used all resources). Evict (from the large subscriptions first then from
// oldest) subscriptions from the current fabric until we have enough resource for the new subscription.
didEvictHandler = true;
while ((usedAttributePaths + aRequestedAttributePathCount > attributePathCap ||
usedEventPaths + aRequestedEventPathCount > eventPathCap || usedReadHandlers >= readHandlerCap) &&
// Avoid infinity loop
didEvictHandler)
{
didEvictHandler = evictAndUpdateResourceUsage(aFabricIndex, true);
}
// If didEvictHandler is false, means the loop above evicted all subscriptions from the current fabric but we still don't have
// enough resources for the new subscription, this should never happen.
// This is safe as long as we have rejected subscriptions without a fabric associated (with a PASE session) before.
// Note: Spec#5141: should reject subscription requests on PASE sessions.
VerifyOrDieWithMsg(didEvictHandler, DataManagement, "Failed to get required resources by evicting existing subscriptions.");
// We have ensured enough resources by the logic above.
return true;
}
bool InteractionModelEngine::TrimFabricForRead(FabricIndex aFabricIndex)
{
const size_t guaranteedReadRequestsPerFabric = GetGuaranteedReadRequestsPerFabric();
const size_t minSupportedPathsPerFabricForRead = guaranteedReadRequestsPerFabric * kMinSupportedPathsPerReadRequest;
size_t attributePathsUsedByCurrentFabric = 0;
size_t eventPathsUsedByCurrentFabric = 0;
size_t readTransactionsOnCurrentFabric = 0;
ReadHandler * candidate = nullptr;
size_t candidateAttributePathsUsed = 0;
size_t candidateEventPathsUsed = 0;
// It is safe to use & here since this function will be called on current stack.
mReadHandlers.ForEachActiveObject([&](ReadHandler * handler) {
if (handler->GetAccessingFabricIndex() != aFabricIndex || !handler->IsType(ReadHandler::InteractionType::Read))
{
return Loop::Continue;
}
size_t attributePathsUsed = handler->GetAttributePathCount();
size_t eventPathsUsed = handler->GetEventPathCount();
attributePathsUsedByCurrentFabric += attributePathsUsed;
eventPathsUsedByCurrentFabric += eventPathsUsed;
readTransactionsOnCurrentFabric++;
if (candidate == nullptr)
{
candidate = handler;
}
// Oversized read handlers will be evicted first.
else if ((attributePathsUsed > kMinSupportedPathsPerReadRequest || eventPathsUsed > kMinSupportedPathsPerReadRequest) &&
(candidateAttributePathsUsed <= kMinSupportedPathsPerReadRequest &&
candidateEventPathsUsed <= kMinSupportedPathsPerReadRequest))
{
candidate = handler;
}
// Read Handlers are "first come first served", so we give eariler read transactions a higher priority.
else if (handler->GetTransactionStartGeneration() > candidate->GetTransactionStartGeneration() &&
// And the level of resource usage is the same (both exceed or neither exceed)
((attributePathsUsed > kMinSupportedPathsPerReadRequest || eventPathsUsed > kMinSupportedPathsPerReadRequest) ==
(candidateAttributePathsUsed > kMinSupportedPathsPerReadRequest ||
candidateEventPathsUsed > kMinSupportedPathsPerReadRequest)))
{
candidate = handler;
}
if (candidate == handler)
{
candidateAttributePathsUsed = attributePathsUsed;
candidateEventPathsUsed = eventPathsUsed;
}
return Loop::Continue;
});
if (candidate != nullptr &&
((attributePathsUsedByCurrentFabric > minSupportedPathsPerFabricForRead ||
eventPathsUsedByCurrentFabric > minSupportedPathsPerFabricForRead ||
readTransactionsOnCurrentFabric > guaranteedReadRequestsPerFabric) ||
// Always evict the transactions on PASE sessions if the fabric table is full.
(aFabricIndex == kUndefinedFabricIndex && mpFabricTable->FabricCount() == GetConfigMaxFabrics())))
{
candidate->Close();
return true;
}
return false;
}
Protocols::InteractionModel::Status InteractionModelEngine::EnsureResourceForRead(FabricIndex aFabricIndex,
size_t aRequestedAttributePathCount,
size_t aRequestedEventPathCount)
{
#if CHIP_SYSTEM_CONFIG_POOL_USE_HEAP && !CHIP_CONFIG_IM_FORCE_FABRIC_QUOTA_CHECK
#if CONFIG_BUILD_FOR_HOST_UNIT_TEST
const bool allowUnlimited = !mForceHandlerQuota;
#else // CONFIG_BUILD_FOR_HOST_UNIT_TEST
// If the resources are allocated on the heap, we should be able to handle as many Read / Subscribe requests as possible.
const bool allowUnlimited = true;
#endif // CONFIG_BUILD_FOR_HOST_UNIT_TEST
#else // CHIP_SYSTEM_CONFIG_POOL_USE_HEAP && !CHIP_CONFIG_IM_FORCE_FABRIC_QUOTA_CHECK
const bool allowUnlimited = false;
#endif // CHIP_SYSTEM_CONFIG_POOL_USE_HEAP && !CHIP_CONFIG_IM_FORCE_FABRIC_QUOTA_CHECK
// If we return early here, the compiler will complain about the unreachable code, so we add a always-true check.
const size_t attributePathCap = allowUnlimited ? SIZE_MAX : GetPathPoolCapacityForReads();
const size_t eventPathCap = allowUnlimited ? SIZE_MAX : GetPathPoolCapacityForReads();
const size_t readHandlerCap = allowUnlimited ? SIZE_MAX : GetReadHandlerPoolCapacityForReads();
const size_t guaranteedReadRequestsPerFabric = GetGuaranteedReadRequestsPerFabric();
const size_t guaranteedPathsPerFabric = kMinSupportedPathsPerReadRequest * guaranteedReadRequestsPerFabric;
size_t usedAttributePaths = 0;
size_t usedEventPaths = 0;
size_t usedReadHandlers = 0;
auto countResourceUsage = [&]() {
usedAttributePaths = 0;
usedEventPaths = 0;
usedReadHandlers = 0;
mReadHandlers.ForEachActiveObject([&](auto * handler) {
if (!handler->IsType(ReadHandler::InteractionType::Read))
{
return Loop::Continue;
}
usedAttributePaths += handler->GetAttributePathCount();
usedEventPaths += handler->GetEventPathCount();
usedReadHandlers++;
return Loop::Continue;
});
};
auto haveEnoughResourcesForTheRequest = [&]() {
return usedAttributePaths + aRequestedAttributePathCount <= attributePathCap &&
usedEventPaths + aRequestedEventPathCount <= eventPathCap && usedReadHandlers < readHandlerCap;
};
countResourceUsage();
if (haveEnoughResourcesForTheRequest())
{
// We have enough resources, then we serve the requests in a best-effort manner.
return Status::Success;
}
if ((aRequestedAttributePathCount > kMinSupportedPathsPerReadRequest &&
usedAttributePaths + aRequestedAttributePathCount > attributePathCap) ||
(aRequestedEventPathCount > kMinSupportedPathsPerReadRequest && usedEventPaths + aRequestedEventPathCount > eventPathCap))
{
// We cannot offer enough resources, and the read transaction is requesting more than the spec limit.
return Status::PathsExhausted;
}
// If we have commissioned CHIP_CONFIG_MAX_FABRICS already, and this transaction doesn't have an associated fabric index, reject
// the request if we don't have sufficient resources for this request.
if (mpFabricTable->FabricCount() == GetConfigMaxFabrics() && aFabricIndex == kUndefinedFabricIndex)
{
return Status::Busy;
}
size_t usedAttributePathsInFabric = 0;
size_t usedEventPathsInFabric = 0;
size_t usedReadHandlersInFabric = 0;
mReadHandlers.ForEachActiveObject([&](auto * handler) {
if (!handler->IsType(ReadHandler::InteractionType::Read) || handler->GetAccessingFabricIndex() != aFabricIndex)
{
return Loop::Continue;
}
usedAttributePathsInFabric += handler->GetAttributePathCount();
usedEventPathsInFabric += handler->GetEventPathCount();
usedReadHandlersInFabric++;
return Loop::Continue;
});
// Busy, since there are already some read requests ongoing on this fabric, please retry later.
if (usedAttributePathsInFabric + aRequestedAttributePathCount > guaranteedPathsPerFabric ||
usedEventPathsInFabric + aRequestedEventPathCount > guaranteedPathsPerFabric ||
usedReadHandlersInFabric >= guaranteedReadRequestsPerFabric)
{
return Status::Busy;
}
const auto evictAndUpdateResourceUsage = [&](FabricIndex fabricIndex) {
bool ret = TrimFabricForRead(fabricIndex);
countResourceUsage();
return ret;
};
//
// At this point, we have an inbound request that respects minimas but we still don't have enough resources to handle it. Which
// means that we definitely have handlers on existing fabrics that are over limits and need to evict at least one of them to
// make space.
//
bool didEvictHandler = true;
while (didEvictHandler)
{
didEvictHandler = false;
didEvictHandler = didEvictHandler || evictAndUpdateResourceUsage(kUndefinedFabricIndex);
if (haveEnoughResourcesForTheRequest())
{
break;
}
// If the fabric table is full, we won't evict read requests from normal fabrics before we have evicted all read requests
// from PASE sessions.
if (mpFabricTable->FabricCount() == GetConfigMaxFabrics() && didEvictHandler)
{
continue;
}
for (const auto & fabric : *mpFabricTable)
{
didEvictHandler = didEvictHandler || evictAndUpdateResourceUsage(fabric.GetFabricIndex());
// If we now have enough resources to serve this request, stop evicting things.
if (haveEnoughResourcesForTheRequest())
{
break;
}
}
}
// Now all fabrics are not oversized (since we have trimmed the oversized fabrics in the loop above), and the read handler is
// also not oversized, we should be able to handle this read transaction.
VerifyOrDie(haveEnoughResourcesForTheRequest());
return Status::Success;
}
#if CHIP_CONFIG_ENABLE_READ_CLIENT
void InteractionModelEngine::RemoveReadClient(ReadClient * apReadClient)
{
ReadClient * pPrevListItem = nullptr;
ReadClient * pCurListItem = mpActiveReadClientList;
while (pCurListItem != apReadClient)
{
//
// Item must exist in this tracker list. If not, there's a bug somewhere.
//
VerifyOrDie(pCurListItem != nullptr);
pPrevListItem = pCurListItem;
pCurListItem = pCurListItem->GetNextClient();
}
if (pPrevListItem)
{
pPrevListItem->SetNextClient(apReadClient->GetNextClient());
}
else
{
mpActiveReadClientList = apReadClient->GetNextClient();
}
apReadClient->SetNextClient(nullptr);
}
size_t InteractionModelEngine::GetNumActiveReadClients()
{
ReadClient * pListItem = mpActiveReadClientList;
size_t count = 0;
while (pListItem)
{
pListItem = pListItem->GetNextClient();
count++;
}
return count;
}
bool InteractionModelEngine::InActiveReadClientList(ReadClient * apReadClient)
{
ReadClient * pListItem = mpActiveReadClientList;
while (pListItem)
{
if (pListItem == apReadClient)
{
return true;
}
pListItem = pListItem->GetNextClient();
}
return false;
}
#endif // CHIP_CONFIG_ENABLE_READ_CLIENT
bool InteractionModelEngine::HasConflictWriteRequests(const WriteHandler * apWriteHandler, const ConcreteAttributePath & aPath)
{
for (auto & writeHandler : mWriteHandlers)
{
if (writeHandler.IsFree() || &writeHandler == apWriteHandler)
{
continue;
}
if (writeHandler.IsCurrentlyProcessingWritePath(aPath))
{
return true;
}
}
return false;
}
void InteractionModelEngine::ReleaseAttributePathList(SingleLinkedListNode<AttributePathParams> *& aAttributePathList)
{
ReleasePool(aAttributePathList, mAttributePathPool);
}
CHIP_ERROR InteractionModelEngine::PushFrontAttributePathList(SingleLinkedListNode<AttributePathParams> *& aAttributePathList,
AttributePathParams & aAttributePath)
{
CHIP_ERROR err = PushFront(aAttributePathList, aAttributePath, mAttributePathPool);
if (err == CHIP_ERROR_NO_MEMORY)
{
ChipLogError(InteractionModel, "AttributePath pool full");
return CHIP_IM_GLOBAL_STATUS(PathsExhausted);
}
return err;
}
void InteractionModelEngine::RemoveDuplicateConcreteAttributePath(SingleLinkedListNode<AttributePathParams> *& aAttributePaths)
{
SingleLinkedListNode<AttributePathParams> * prev = nullptr;
auto * path1 = aAttributePaths;
while (path1 != nullptr)
{
bool duplicate = false;
// skip all wildcard paths and invalid concrete attribute
if (path1->mValue.IsWildcardPath() ||
!emberAfContainsAttribute(path1->mValue.mEndpointId, path1->mValue.mClusterId, path1->mValue.mAttributeId))
{
prev = path1;
path1 = path1->mpNext;
continue;
}
// Check whether a wildcard path expands to something that includes this concrete path.
for (auto * path2 = aAttributePaths; path2 != nullptr; path2 = path2->mpNext)
{
if (path2 == path1)
{
continue;
}
if (path2->mValue.IsWildcardPath() && path2->mValue.IsAttributePathSupersetOf(path1->mValue))
{
duplicate = true;
break;
}
}
// if path1 duplicates something from wildcard expansion, discard path1
if (!duplicate)
{
prev = path1;
path1 = path1->mpNext;
continue;
}
if (path1 == aAttributePaths)
{
aAttributePaths = path1->mpNext;
mAttributePathPool.ReleaseObject(path1);
path1 = aAttributePaths;
}
else
{
prev->mpNext = path1->mpNext;
mAttributePathPool.ReleaseObject(path1);
path1 = prev->mpNext;
}
}
}
void InteractionModelEngine::ReleaseEventPathList(SingleLinkedListNode<EventPathParams> *& aEventPathList)
{
ReleasePool(aEventPathList, mEventPathPool);
}
CHIP_ERROR InteractionModelEngine::PushFrontEventPathParamsList(SingleLinkedListNode<EventPathParams> *& aEventPathList,
EventPathParams & aEventPath)
{
CHIP_ERROR err = PushFront(aEventPathList, aEventPath, mEventPathPool);
if (err == CHIP_ERROR_NO_MEMORY)
{
ChipLogError(InteractionModel, "EventPath pool full");
return CHIP_IM_GLOBAL_STATUS(PathsExhausted);
}
return err;
}
void InteractionModelEngine::ReleaseDataVersionFilterList(SingleLinkedListNode<DataVersionFilter> *& aDataVersionFilterList)
{
ReleasePool(aDataVersionFilterList, mDataVersionFilterPool);
}
CHIP_ERROR InteractionModelEngine::PushFrontDataVersionFilterList(SingleLinkedListNode<DataVersionFilter> *& aDataVersionFilterList,
DataVersionFilter & aDataVersionFilter)
{
CHIP_ERROR err = PushFront(aDataVersionFilterList, aDataVersionFilter, mDataVersionFilterPool);
if (err == CHIP_ERROR_NO_MEMORY)
{
ChipLogError(InteractionModel, "DataVersionFilter pool full, ignore this filter");
err = CHIP_NO_ERROR;
}
return err;
}
template <typename T, size_t N>
void InteractionModelEngine::ReleasePool(SingleLinkedListNode<T> *& aObjectList,
ObjectPool<SingleLinkedListNode<T>, N> & aObjectPool)
{
SingleLinkedListNode<T> * current = aObjectList;
while (current != nullptr)
{
SingleLinkedListNode<T> * nextObject = current->mpNext;
aObjectPool.ReleaseObject(current);
current = nextObject;
}
aObjectList = nullptr;
}
template <typename T, size_t N>
CHIP_ERROR InteractionModelEngine::PushFront(SingleLinkedListNode<T> *& aObjectList, T & aData,
ObjectPool<SingleLinkedListNode<T>, N> & aObjectPool)
{
SingleLinkedListNode<T> * object = aObjectPool.CreateObject();
if (object == nullptr)
{
return CHIP_ERROR_NO_MEMORY;
}
object->mValue = aData;
object->mpNext = aObjectList;
aObjectList = object;
return CHIP_NO_ERROR;
}
void InteractionModelEngine::DispatchCommand(CommandHandler & apCommandObj, const ConcreteCommandPath & aCommandPath,
TLV::TLVReader & apPayload)
{
CommandHandlerInterface * handler = FindCommandHandler(aCommandPath.mEndpointId, aCommandPath.mClusterId);
if (handler)
{
CommandHandlerInterface::HandlerContext context(apCommandObj, aCommandPath, apPayload);
handler->InvokeCommand(context);
//
// If the command was handled, don't proceed any further and return successfully.
//
if (context.mCommandHandled)
{
return;
}
}
DispatchSingleClusterCommand(aCommandPath, apPayload, &apCommandObj);
}
Protocols::InteractionModel::Status InteractionModelEngine::CommandExists(const ConcreteCommandPath & aCommandPath)
{
return ServerClusterCommandExists(aCommandPath);
}
CHIP_ERROR InteractionModelEngine::RegisterCommandHandler(CommandHandlerInterface * handler)
{
VerifyOrReturnError(handler != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
for (auto * cur = mCommandHandlerList; cur; cur = cur->GetNext())
{
if (cur->Matches(*handler))
{
ChipLogError(InteractionModel, "Duplicate command handler registration failed");
return CHIP_ERROR_INCORRECT_STATE;
}
}
handler->SetNext(mCommandHandlerList);
mCommandHandlerList = handler;
return CHIP_NO_ERROR;
}
void InteractionModelEngine::UnregisterCommandHandlers(EndpointId endpointId)
{
CommandHandlerInterface * prev = nullptr;
for (auto * cur = mCommandHandlerList; cur; cur = cur->GetNext())
{
if (cur->MatchesEndpoint(endpointId))
{
if (prev == nullptr)
{
mCommandHandlerList = cur->GetNext();
}
else
{
prev->SetNext(cur->GetNext());
}
cur->SetNext(nullptr);
}
else
{
prev = cur;
}
}
}
CHIP_ERROR InteractionModelEngine::UnregisterCommandHandler(CommandHandlerInterface * handler)
{
VerifyOrReturnError(handler != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
CommandHandlerInterface * prev = nullptr;
for (auto * cur = mCommandHandlerList; cur; cur = cur->GetNext())
{
if (cur->Matches(*handler))
{
if (prev == nullptr)
{
mCommandHandlerList = cur->GetNext();
}
else
{
prev->SetNext(cur->GetNext());
}
cur->SetNext(nullptr);
return CHIP_NO_ERROR;
}
prev = cur;
}
return CHIP_ERROR_KEY_NOT_FOUND;
}
CommandHandlerInterface * InteractionModelEngine::FindCommandHandler(EndpointId endpointId, ClusterId clusterId)
{
for (auto * cur = mCommandHandlerList; cur; cur = cur->GetNext())
{
if (cur->Matches(endpointId, clusterId))
{
return cur;
}
}
return nullptr;
}
void InteractionModelEngine::OnTimedInteractionFailed(TimedHandler * apTimedHandler)
{
mTimedHandlers.ReleaseObject(apTimedHandler);
}
void InteractionModelEngine::OnTimedInvoke(TimedHandler * apTimedHandler, Messaging::ExchangeContext * apExchangeContext,
const PayloadHeader & aPayloadHeader, System::PacketBufferHandle && aPayload)
{
using namespace Protocols::InteractionModel;
// Reset the ourselves as the exchange delegate for now, to match what we'd
// do with an initial unsolicited invoke.
apExchangeContext->SetDelegate(this);
mTimedHandlers.ReleaseObject(apTimedHandler);
VerifyOrDie(aPayloadHeader.HasMessageType(MsgType::InvokeCommandRequest));
VerifyOrDie(!apExchangeContext->IsGroupExchangeContext());
Status status = OnInvokeCommandRequest(apExchangeContext, aPayloadHeader, std::move(aPayload), /* aIsTimedInvoke = */ true);
if (status != Status::Success)
{
StatusResponse::Send(status, apExchangeContext, /* aExpectResponse = */ false);
}
}
void InteractionModelEngine::OnTimedWrite(TimedHandler * apTimedHandler, Messaging::ExchangeContext * apExchangeContext,
const PayloadHeader & aPayloadHeader, System::PacketBufferHandle && aPayload)
{
using namespace Protocols::InteractionModel;
// Reset the ourselves as the exchange delegate for now, to match what we'd
// do with an initial unsolicited write.
apExchangeContext->SetDelegate(this);
mTimedHandlers.ReleaseObject(apTimedHandler);
VerifyOrDie(aPayloadHeader.HasMessageType(MsgType::WriteRequest));
VerifyOrDie(!apExchangeContext->IsGroupExchangeContext());
Status status = OnWriteRequest(apExchangeContext, aPayloadHeader, std::move(aPayload), /* aIsTimedWrite = */ true);
if (status != Status::Success)
{
StatusResponse::Send(status, apExchangeContext, /* aExpectResponse = */ false);
}
}
bool InteractionModelEngine::HasActiveRead()
{
return ((mReadHandlers.ForEachActiveObject([](ReadHandler * handler) {
if (handler->IsType(ReadHandler::InteractionType::Read))
{
return Loop::Break;
}
return Loop::Continue;
}) == Loop::Break));
}
uint16_t InteractionModelEngine::GetMinGuaranteedSubscriptionsPerFabric() const
{
#if CHIP_SYSTEM_CONFIG_POOL_USE_HEAP
return UINT16_MAX;
#else
return static_cast<uint16_t>(
min(GetReadHandlerPoolCapacityForSubscriptions() / GetConfigMaxFabrics(), static_cast<size_t>(UINT16_MAX)));
#endif
}
size_t InteractionModelEngine::GetNumDirtySubscriptions() const
{
size_t numDirtySubscriptions = 0;
mReadHandlers.ForEachActiveObject([&](const auto readHandler) {
if (readHandler->IsType(ReadHandler::InteractionType::Subscribe) && readHandler->IsDirty())
{
numDirtySubscriptions++;
}
return Loop::Continue;
});
return numDirtySubscriptions;
}
void InteractionModelEngine::OnFabricRemoved(const FabricTable & fabricTable, FabricIndex fabricIndex)
{
mReadHandlers.ForEachActiveObject([fabricIndex](ReadHandler * handler) {
if (handler->GetAccessingFabricIndex() == fabricIndex)
{
ChipLogProgress(InteractionModel, "Deleting expired ReadHandler for NodeId: " ChipLogFormatX64 ", FabricIndex: %u",
ChipLogValueX64(handler->GetInitiatorNodeId()), fabricIndex);
handler->Close();
}
return Loop::Continue;
});
#if CHIP_CONFIG_ENABLE_READ_CLIENT
for (auto * readClient = mpActiveReadClientList; readClient != nullptr; readClient = readClient->GetNextClient())
{
if (readClient->GetFabricIndex() == fabricIndex)
{
ChipLogProgress(InteractionModel, "Fabric removed, deleting obsolete read client with FabricIndex: %u", fabricIndex);
readClient->Close(CHIP_ERROR_IM_FABRIC_DELETED, false);
}
}
#endif // CHIP_CONFIG_ENABLE_READ_CLIENT
for (auto & handler : mWriteHandlers)
{
if (!(handler.IsFree()) && handler.GetAccessingFabricIndex() == fabricIndex)
{
ChipLogProgress(InteractionModel, "Fabric removed, deleting obsolete write handler with FabricIndex: %u", fabricIndex);
handler.Close();
}
}
// Applications may hold references to CommandHandler instances for async command processing.
// Therefore we can't forcible destroy CommandHandlers here. Their exchanges will get closed by
// the fabric removal, though, so they will fail when they try to actually send their command response
// and will close at that point.
}
CHIP_ERROR InteractionModelEngine::ResumeSubscriptions()
{
#if CHIP_CONFIG_PERSIST_SUBSCRIPTIONS
ReturnErrorCodeIf(!mpSubscriptionResumptionStorage, CHIP_NO_ERROR);
#if CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
ReturnErrorCodeIf(mSubscriptionResumptionScheduled, CHIP_NO_ERROR);
#endif
// To avoid the case of a reboot loop causing rapid traffic generation / power consumption, subscription resumption should make
// use of the persisted min-interval values, and wait before resumption. Ideally, each persisted subscription should wait their
// own min-interval value before resumption, but that both A) potentially runs into a timer resource issue, and B) having a
// low-powered device wake many times also has energy use implications. The logic below waits the largest of the persisted
// min-interval values before resuming subscriptions.
// Even though this causes subscription-to-subscription interaction by linking the min-interval values, this is the right thing
// to do for now because it's both simple and avoids the timer resource and multiple-wake problems. This issue is to track
// future improvements: https://github.com/project-chip/connectedhomeip/issues/25439
SubscriptionResumptionStorage::SubscriptionInfo subscriptionInfo;
auto * iterator = mpSubscriptionResumptionStorage->IterateSubscriptions();
mNumOfSubscriptionsToResume = 0;
uint16_t minInterval = 0;
while (iterator->Next(subscriptionInfo))
{
mNumOfSubscriptionsToResume++;
minInterval = std::max(minInterval, subscriptionInfo.mMinInterval);
}
iterator->Release();
if (mNumOfSubscriptionsToResume)
{
#if CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
mSubscriptionResumptionScheduled = true;
#endif
ChipLogProgress(InteractionModel, "Resuming %d subscriptions in %u seconds", mNumOfSubscriptionsToResume, minInterval);
ReturnErrorOnFailure(mpExchangeMgr->GetSessionManager()->SystemLayer()->StartTimer(System::Clock::Seconds16(minInterval),
ResumeSubscriptionsTimerCallback, this));
}
else
{
ChipLogProgress(InteractionModel, "No subscriptions to resume");
}
#endif // CHIP_CONFIG_PERSIST_SUBSCRIPTIONS
return CHIP_NO_ERROR;
}
void InteractionModelEngine::ResumeSubscriptionsTimerCallback(System::Layer * apSystemLayer, void * apAppState)
{
#if CHIP_CONFIG_PERSIST_SUBSCRIPTIONS
VerifyOrReturn(apAppState != nullptr);
InteractionModelEngine * imEngine = static_cast<InteractionModelEngine *>(apAppState);
#if CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
imEngine->mSubscriptionResumptionScheduled = false;
bool resumedSubscriptions = false;
#endif // CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
SubscriptionResumptionStorage::SubscriptionInfo subscriptionInfo;
AutoReleaseSubscriptionInfoIterator iterator(imEngine->mpSubscriptionResumptionStorage->IterateSubscriptions());
while (iterator->Next(subscriptionInfo))
{
// If subscription happens between reboot and this timer callback, it's already live and should skip resumption
if (Loop::Break == imEngine->mReadHandlers.ForEachActiveObject([&](ReadHandler * handler) {
SubscriptionId subscriptionId;
handler->GetSubscriptionId(subscriptionId);
if (subscriptionId == subscriptionInfo.mSubscriptionId)
{
return Loop::Break;
}
return Loop::Continue;
}))
{
ChipLogProgress(InteractionModel, "Skip resuming live subscriptionId %" PRIu32, subscriptionInfo.mSubscriptionId);
continue;
}
auto subscriptionResumptionSessionEstablisher = Platform::MakeUnique<SubscriptionResumptionSessionEstablisher>();
if (subscriptionResumptionSessionEstablisher == nullptr)
{
ChipLogProgress(InteractionModel, "Failed to create SubscriptionResumptionSessionEstablisher");
return;
}
if (subscriptionResumptionSessionEstablisher->ResumeSubscription(*imEngine->mpCASESessionMgr, subscriptionInfo) !=
CHIP_NO_ERROR)
{
ChipLogProgress(InteractionModel, "Failed to ResumeSubscription 0x%" PRIx32, subscriptionInfo.mSubscriptionId);
return;
}
subscriptionResumptionSessionEstablisher.release();
#if CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
resumedSubscriptions = true;
#endif // CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
}
#if CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
// If no persisted subscriptions needed resumption then all resumption retries are done
if (!resumedSubscriptions)
{
imEngine->mNumSubscriptionResumptionRetries = 0;
}
#endif // CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
#endif // CHIP_CONFIG_PERSIST_SUBSCRIPTIONS
}
#if CHIP_CONFIG_PERSIST_SUBSCRIPTIONS && CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
uint32_t InteractionModelEngine::ComputeTimeSecondsTillNextSubscriptionResumption()
{
#if CONFIG_BUILD_FOR_HOST_UNIT_TEST
if (mSubscriptionResumptionRetrySecondsOverride > 0)
{
return static_cast<uint32_t>(mSubscriptionResumptionRetrySecondsOverride);
}
#endif
if (mNumSubscriptionResumptionRetries > CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION_MAX_FIBONACCI_STEP_INDEX)
{
return CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION_MAX_RETRY_INTERVAL_SECS;
}
return CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION_MIN_RETRY_INTERVAL_SECS +
GetFibonacciForIndex(mNumSubscriptionResumptionRetries) *
CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION_WAIT_TIME_MULTIPLIER_SECS;
}
bool InteractionModelEngine::HasSubscriptionsToResume()
{
VerifyOrReturnValue(mpSubscriptionResumptionStorage != nullptr, false);
// Look through persisted subscriptions and see if any aren't already in mReadHandlers pool
SubscriptionResumptionStorage::SubscriptionInfo subscriptionInfo;
auto * iterator = mpSubscriptionResumptionStorage->IterateSubscriptions();
bool foundSubscriptionToResume = false;
while (iterator->Next(subscriptionInfo))
{
if (Loop::Break == mReadHandlers.ForEachActiveObject([&](ReadHandler * handler) {
SubscriptionId subscriptionId;
handler->GetSubscriptionId(subscriptionId);
if (subscriptionId == subscriptionInfo.mSubscriptionId)
{
return Loop::Break;
}
return Loop::Continue;
}))
{
continue;
}
foundSubscriptionToResume = true;
break;
}
iterator->Release();
return foundSubscriptionToResume;
}
#endif // CHIP_CONFIG_PERSIST_SUBSCRIPTIONS && CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
#if CHIP_CONFIG_PERSIST_SUBSCRIPTIONS
void InteractionModelEngine::DecrementNumSubscriptionsToResume()
{
VerifyOrReturn(mNumOfSubscriptionsToResume > 0);
#if CHIP_CONFIG_ENABLE_ICD_CIP && !CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
VerifyOrDie(mICDManager);
#endif // CHIP_CONFIG_ENABLE_ICD_CIP && !CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
mNumOfSubscriptionsToResume--;
#if CHIP_CONFIG_ENABLE_ICD_CIP && !CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
if (!mNumOfSubscriptionsToResume)
{
mICDManager->SetBootUpResumeSubscriptionExecuted();
}
#endif // CHIP_CONFIG_ENABLE_ICD_CIP && !CHIP_CONFIG_SUBSCRIPTION_TIMEOUT_RESUMPTION
}
#endif // CHIP_CONFIG_PERSIST_SUBSCRIPTIONS
} // namespace app
} // namespace chip