src/app/codegen-data-model-provider/CodegenDataModelProvider.cpp - third_party/github/project-chip/connectedhomeip - Git at Google

 /*
  *    Copyright (c) 2024 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.
  */
 #include <app/codegen-data-model-provider/CodegenDataModelProvider.h>

 #include <app-common/zap-generated/attribute-type.h>
 #include <app/RequiredPrivilege.h>
 #include <app/util/IMClusterCommandHandler.h>
 #include <app/util/attribute-storage.h>
 #include <app/util/endpoint-config-api.h>
 #include <lib/core/DataModelTypes.h>

 #include <optional>
 #include <variant>

 namespace chip {
 namespace app {
 namespace {

 /// Load the cluster information into the specified destination
 std::variant<CHIP_ERROR, DataModel::ClusterInfo> LoadClusterInfo(const ConcreteClusterPath & path, const EmberAfCluster & cluster)
 {
     DataVersion * versionPtr = emberAfDataVersionStorage(path);
     if (versionPtr == nullptr)
     {
         ChipLogError(AppServer, "Failed to get data version for %d/" ChipLogFormatMEI, static_cast<int>(path.mEndpointId),
                      ChipLogValueMEI(cluster.clusterId));
         return CHIP_ERROR_NOT_FOUND;
     }

     DataModel::ClusterInfo info(*versionPtr);

     // TODO: set entry flags:
     //   info->flags.Set(ClusterQualityFlags::kDiagnosticsData)

     return info;
 }

 /// Converts a EmberAfCluster into a ClusterEntry
 std::variant<CHIP_ERROR, DataModel::ClusterEntry> ClusterEntryFrom(EndpointId endpointId, const EmberAfCluster & cluster)
 {
     ConcreteClusterPath clusterPath(endpointId, cluster.clusterId);
     auto info = LoadClusterInfo(clusterPath, cluster);

     if (CHIP_ERROR * err = std::get_if<CHIP_ERROR>(&info))
     {
         return *err;
     }

     if (DataModel::ClusterInfo * infoValue = std::get_if<DataModel::ClusterInfo>(&info))
     {
         return DataModel::ClusterEntry{
             .path = clusterPath,
             .info = *infoValue,
         };
     }
     return CHIP_ERROR_INCORRECT_STATE;
 }

 /// Finds the first server cluster entry for the given endpoint data starting at [start_index]
 ///
 /// Returns an invalid entry if no more server clusters are found
 DataModel::ClusterEntry FirstServerClusterEntry(EndpointId endpointId, const EmberAfEndpointType * endpoint, unsigned start_index,
                                                 unsigned & found_index)
 {
     for (unsigned cluster_idx = start_index; cluster_idx < endpoint->clusterCount; cluster_idx++)
     {
         const EmberAfCluster & cluster = endpoint->cluster[cluster_idx];
         if (!cluster.IsServer())
         {
             continue;
         }

         found_index = cluster_idx;
         auto entry  = ClusterEntryFrom(endpointId, cluster);

         if (DataModel::ClusterEntry * entryValue = std::get_if<DataModel::ClusterEntry>(&entry))
         {
             return *entryValue;
         }

 #if CHIP_ERROR_LOGGING
         if (CHIP_ERROR * errValue = std::get_if<CHIP_ERROR>(&entry))
         {
             ChipLogError(AppServer, "Failed to load cluster entry: %" CHIP_ERROR_FORMAT, errValue->Format());
         }
         else
         {
             // Should NOT be possible: entryFrom has only 2 variants
             ChipLogError(AppServer, "Failed to load cluster entry, UNKNOWN entry return type");
         }
 #endif
     }

     return DataModel::ClusterEntry::kInvalid;
 }

 /// Load the attribute information into the specified destination
 ///
 /// `info` is assumed to be default-constructed/clear (i.e. this sets flags, but does not reset them).
 void LoadAttributeInfo(const ConcreteAttributePath & path, const EmberAfAttributeMetadata & attribute,
                        DataModel::AttributeInfo * info)
 {
     info->readPrivilege = RequiredPrivilege::ForReadAttribute(path);
     if (!attribute.IsReadOnly())
     {
         info->writePrivilege = RequiredPrivilege::ForWriteAttribute(path);
     }

     info->flags.Set(DataModel::AttributeQualityFlags::kListAttribute, (attribute.attributeType == ZCL_ARRAY_ATTRIBUTE_TYPE));
     info->flags.Set(DataModel::AttributeQualityFlags::kTimed, attribute.MustUseTimedWrite());

     // NOTE: we do NOT provide additional info for:
     //    - IsExternal/IsSingleton/IsAutomaticallyPersisted is not used by IM handling
     //    - IsSingleton spec defines it for CLUSTERS where as we have it for ATTRIBUTES
     //    - Several specification flags are not available (reportable, quieter reporting,
     //      fixed, source attribution)

     // TODO: Set additional flags:
     // info->flags.Set(DataModel::AttributeQualityFlags::kFabricScoped)
     // info->flags.Set(DataModel::AttributeQualityFlags::kFabricSensitive)
     // info->flags.Set(DataModel::AttributeQualityFlags::kChangesOmitted)
 }

 DataModel::AttributeEntry AttributeEntryFrom(const ConcreteClusterPath & clusterPath, const EmberAfAttributeMetadata & attribute)
 {
     DataModel::AttributeEntry entry;

     entry.path = ConcreteAttributePath(clusterPath.mEndpointId, clusterPath.mClusterId, attribute.attributeId);
     LoadAttributeInfo(entry.path, attribute, &entry.info);

     return entry;
 }

 DataModel::CommandEntry CommandEntryFrom(const ConcreteClusterPath & clusterPath, CommandId clusterCommandId)
 {
     DataModel::CommandEntry entry;
     entry.path                 = ConcreteCommandPath(clusterPath.mEndpointId, clusterPath.mClusterId, clusterCommandId);
     entry.info.invokePrivilege = RequiredPrivilege::ForInvokeCommand(entry.path);

     entry.info.flags.Set(DataModel::CommandQualityFlags::kTimed, CommandNeedsTimedInvoke(clusterPath.mClusterId, clusterCommandId));

     entry.info.flags.Set(DataModel::CommandQualityFlags::kFabricScoped,
                          CommandIsFabricScoped(clusterPath.mClusterId, clusterCommandId));

     return entry;
 }

 const ConcreteCommandPath kInvalidCommandPath(kInvalidEndpointId, kInvalidClusterId, kInvalidCommandId);

 } // namespace

 std::optional<CommandId> CodegenDataModelProvider::EmberCommandListIterator::First(const CommandId * list)
 {
     VerifyOrReturnValue(list != nullptr, std::nullopt);
     mCurrentList = mCurrentHint = list;

     VerifyOrReturnValue(*mCurrentList != kInvalidCommandId, std::nullopt);
     return *mCurrentList;
 }

 std::optional<CommandId> CodegenDataModelProvider::EmberCommandListIterator::Next(const CommandId * list, CommandId previousId)
 {
     VerifyOrReturnValue(list != nullptr, std::nullopt);
     VerifyOrReturnValue(previousId != kInvalidCommandId, std::nullopt);

     if (mCurrentList != list)
     {
         // invalidate the hint if switching lists...
         mCurrentHint = nullptr;
         mCurrentList = list;
     }

     if ((mCurrentHint == nullptr) || (*mCurrentHint != previousId))
     {
         // we did not find a usable hint. Search from the to set the hint
         mCurrentHint = mCurrentList;
         while ((*mCurrentHint != kInvalidCommandId) && (*mCurrentHint != previousId))
         {
             mCurrentHint++;
         }
     }

     VerifyOrReturnValue(*mCurrentHint == previousId, std::nullopt);

     // hint is valid and can be used immediately
     mCurrentHint++; // this is the next value
     return (*mCurrentHint == kInvalidCommandId) ? std::nullopt : std::make_optional(*mCurrentHint);
 }

 bool CodegenDataModelProvider::EmberCommandListIterator::Exists(const CommandId * list, CommandId toCheck)
 {
     VerifyOrReturnValue(list != nullptr, false);
     VerifyOrReturnValue(toCheck != kInvalidCommandId, false);

     if (mCurrentList != list)
     {
         // invalidate the hint if switching lists...
         mCurrentHint = nullptr;
         mCurrentList = list;
     }

     // maybe already positioned correctly
     if ((mCurrentHint != nullptr) && (*mCurrentHint == toCheck))
     {
         return true;
     }

     // move and try to find it
     mCurrentHint = mCurrentList;
     while ((*mCurrentHint != kInvalidCommandId) && (*mCurrentHint != toCheck))
     {
         mCurrentHint++;
     }

     return (*mCurrentHint == toCheck);
 }

 DataModel::ActionReturnStatus CodegenDataModelProvider::Invoke(const DataModel::InvokeRequest & request,
                                                                TLV::TLVReader & input_arguments, CommandHandler * handler)
 {
     // TODO: CommandHandlerInterface support is currently
     //       residing in InteractionModelEngine itself. We may want to separate this out
     //       into its own registry, similar to attributes, so that IM is decoupled from actual storage of things.
     //
     //       Open issue at https://github.com/project-chip/connectedhomeip/issues/34258

     // Ember dispatching automatically uses `handler` to set an appropriate result or status
     // This never fails (as handler error is encoded as needed).
     DispatchSingleClusterCommand(request.path, input_arguments, handler);

     return CHIP_NO_ERROR;
 }

 EndpointId CodegenDataModelProvider::FirstEndpoint()
 {
     // find the first enabled index
     const uint16_t lastEndpointIndex = emberAfEndpointCount();
     for (uint16_t endpoint_idx = 0; endpoint_idx < lastEndpointIndex; endpoint_idx++)
     {
         if (emberAfEndpointIndexIsEnabled(endpoint_idx))
         {
             mEndpointIterationHint = endpoint_idx;
             return emberAfEndpointFromIndex(endpoint_idx);
         }
     }

     // No enabled endpoint found. Give up
     return kInvalidEndpointId;
 }

 std::optional<unsigned> CodegenDataModelProvider::TryFindEndpointIndex(EndpointId id) const
 {
     const uint16_t lastEndpointIndex = emberAfEndpointCount();

     if ((mEndpointIterationHint < lastEndpointIndex) && emberAfEndpointIndexIsEnabled(mEndpointIterationHint) &&
         (id == emberAfEndpointFromIndex(mEndpointIterationHint)))
     {
         return std::make_optional(mEndpointIterationHint);
     }

     // Linear search, this may be slow
     uint16_t idx = emberAfIndexFromEndpoint(id);
     if (idx == kEmberInvalidEndpointIndex)
     {
         return std::nullopt;
     }

     return std::make_optional<unsigned>(idx);
 }

 EndpointId CodegenDataModelProvider::NextEndpoint(EndpointId before)
 {
     const uint16_t lastEndpointIndex = emberAfEndpointCount();

     std::optional<unsigned> before_idx = TryFindEndpointIndex(before);
     if (!before_idx.has_value())
     {
         return kInvalidEndpointId;
     }

     // find the first enabled index
     for (uint16_t endpoint_idx = static_cast<uint16_t>(*before_idx + 1); endpoint_idx < lastEndpointIndex; endpoint_idx++)
     {
         if (emberAfEndpointIndexIsEnabled(endpoint_idx))
         {
             mEndpointIterationHint = endpoint_idx;
             return emberAfEndpointFromIndex(endpoint_idx);
         }
     }

     // No enabled enpoint after "before" was found, give up
     return kInvalidEndpointId;
 }

 DataModel::ClusterEntry CodegenDataModelProvider::FirstCluster(EndpointId endpointId)
 {
     const EmberAfEndpointType * endpoint = emberAfFindEndpointType(endpointId);
     VerifyOrReturnValue(endpoint != nullptr, DataModel::ClusterEntry::kInvalid);
     VerifyOrReturnValue(endpoint->clusterCount > 0, DataModel::ClusterEntry::kInvalid);
     VerifyOrReturnValue(endpoint->cluster != nullptr, DataModel::ClusterEntry::kInvalid);

     return FirstServerClusterEntry(endpointId, endpoint, 0, mClusterIterationHint);
 }

 std::optional<unsigned> CodegenDataModelProvider::TryFindServerClusterIndex(const EmberAfEndpointType * endpoint,
                                                                             ClusterId id) const
 {
     const unsigned clusterCount = endpoint->clusterCount;

     if (mClusterIterationHint < clusterCount)
     {
         const EmberAfCluster & cluster = endpoint->cluster[mClusterIterationHint];
         if (cluster.IsServer() && (cluster.clusterId == id))
         {
             return std::make_optional(mClusterIterationHint);
         }
     }

     // linear search, this may be slow
     // does NOT use emberAfClusterIndex to not iterate over endpoints as we have
     // already found the correct endpoint
     for (unsigned cluster_idx = 0; cluster_idx < clusterCount; cluster_idx++)
     {
         const EmberAfCluster & cluster = endpoint->cluster[cluster_idx];
         if (cluster.IsServer() && (cluster.clusterId == id))
         {
             return std::make_optional(cluster_idx);
         }
     }

     return std::nullopt;
 }

 DataModel::ClusterEntry CodegenDataModelProvider::NextCluster(const ConcreteClusterPath & before)
 {
     // TODO: This search still seems slow (ember will loop). Should use index hints as long
     //       as ember API supports it
     const EmberAfEndpointType * endpoint = emberAfFindEndpointType(before.mEndpointId);

     VerifyOrReturnValue(endpoint != nullptr, DataModel::ClusterEntry::kInvalid);
     VerifyOrReturnValue(endpoint->clusterCount > 0, DataModel::ClusterEntry::kInvalid);
     VerifyOrReturnValue(endpoint->cluster != nullptr, DataModel::ClusterEntry::kInvalid);

     std::optional<unsigned> cluster_idx = TryFindServerClusterIndex(endpoint, before.mClusterId);
     if (!cluster_idx.has_value())
     {
         return DataModel::ClusterEntry::kInvalid;
     }

     return FirstServerClusterEntry(before.mEndpointId, endpoint, *cluster_idx + 1, mClusterIterationHint);
 }

 std::optional<DataModel::ClusterInfo> CodegenDataModelProvider::GetClusterInfo(const ConcreteClusterPath & path)
 {
     const EmberAfCluster * cluster = FindServerCluster(path);

     VerifyOrReturnValue(cluster != nullptr, std::nullopt);

     auto info = LoadClusterInfo(path, *cluster);

     if (CHIP_ERROR * err = std::get_if<CHIP_ERROR>(&info))
     {
 #if CHIP_ERROR_LOGGING
         ChipLogError(AppServer, "Failed to load cluster info: %" CHIP_ERROR_FORMAT, err->Format());
 #else
         (void) err->Format();
 #endif
         return std::nullopt;
     }

     return std::make_optional(std::get<DataModel::ClusterInfo>(info));
 }

 DataModel::AttributeEntry CodegenDataModelProvider::FirstAttribute(const ConcreteClusterPath & path)
 {
     const EmberAfCluster * cluster = FindServerCluster(path);

     VerifyOrReturnValue(cluster != nullptr, DataModel::AttributeEntry::kInvalid);
     VerifyOrReturnValue(cluster->attributeCount > 0, DataModel::AttributeEntry::kInvalid);
     VerifyOrReturnValue(cluster->attributes != nullptr, DataModel::AttributeEntry::kInvalid);

     mAttributeIterationHint = 0;
     return AttributeEntryFrom(path, cluster->attributes[0]);
 }

 std::optional<unsigned> CodegenDataModelProvider::TryFindAttributeIndex(const EmberAfCluster * cluster, AttributeId id) const
 {
     const unsigned attributeCount = cluster->attributeCount;

     // attempt to find this based on the embedded hint
     if ((mAttributeIterationHint < attributeCount) && (cluster->attributes[mAttributeIterationHint].attributeId == id))
     {
         return std::make_optional(mAttributeIterationHint);
     }

     // linear search is required. This may be slow
     for (unsigned attribute_idx = 0; attribute_idx < attributeCount; attribute_idx++)
     {

         if (cluster->attributes[attribute_idx].attributeId == id)
         {
             return std::make_optional(attribute_idx);
         }
     }

     return std::nullopt;
 }

 const EmberAfCluster * CodegenDataModelProvider::FindServerCluster(const ConcreteClusterPath & path)
 {
     // cache things
     if (mPreviouslyFoundCluster.has_value() && (mPreviouslyFoundCluster->path == path))
     {
         return mPreviouslyFoundCluster->cluster;
     }

     const EmberAfCluster * cluster = emberAfFindServerCluster(path.mEndpointId, path.mClusterId);
     if (cluster != nullptr)
     {
         mPreviouslyFoundCluster = std::make_optional<ClusterReference>(path, cluster);
     }
     return cluster;
 }

 DataModel::AttributeEntry CodegenDataModelProvider::NextAttribute(const ConcreteAttributePath & before)
 {
     const EmberAfCluster * cluster = FindServerCluster(before);
     VerifyOrReturnValue(cluster != nullptr, DataModel::AttributeEntry::kInvalid);
     VerifyOrReturnValue(cluster->attributeCount > 0, DataModel::AttributeEntry::kInvalid);
     VerifyOrReturnValue(cluster->attributes != nullptr, DataModel::AttributeEntry::kInvalid);

     // find the given attribute in the list and then return the next one
     std::optional<unsigned> attribute_idx = TryFindAttributeIndex(cluster, before.mAttributeId);
     if (!attribute_idx.has_value())
     {
         return DataModel::AttributeEntry::kInvalid;
     }

     unsigned next_idx = *attribute_idx + 1;
     if (next_idx < cluster->attributeCount)
     {
         mAttributeIterationHint = next_idx;
         return AttributeEntryFrom(before, cluster->attributes[next_idx]);
     }

     // iteration complete
     return DataModel::AttributeEntry::kInvalid;
 }

 std::optional<DataModel::AttributeInfo> CodegenDataModelProvider::GetAttributeInfo(const ConcreteAttributePath & path)
 {
     const EmberAfCluster * cluster = FindServerCluster(path);

     VerifyOrReturnValue(cluster != nullptr, std::nullopt);
     VerifyOrReturnValue(cluster->attributeCount > 0, std::nullopt);
     VerifyOrReturnValue(cluster->attributes != nullptr, std::nullopt);

     std::optional<unsigned> attribute_idx = TryFindAttributeIndex(cluster, path.mAttributeId);

     if (!attribute_idx.has_value())
     {
         return std::nullopt;
     }

     DataModel::AttributeInfo info;
     LoadAttributeInfo(path, cluster->attributes[*attribute_idx], &info);
     return std::make_optional(info);
 }

 DataModel::CommandEntry CodegenDataModelProvider::FirstAcceptedCommand(const ConcreteClusterPath & path)
 {
     const EmberAfCluster * cluster = FindServerCluster(path);

     VerifyOrReturnValue(cluster != nullptr, DataModel::CommandEntry::kInvalid);

     std::optional<CommandId> commandId = mAcceptedCommandsIterator.First(cluster->acceptedCommandList);
     VerifyOrReturnValue(commandId.has_value(), DataModel::CommandEntry::kInvalid);

     return CommandEntryFrom(path, *commandId);
 }

 DataModel::CommandEntry CodegenDataModelProvider::NextAcceptedCommand(const ConcreteCommandPath & before)
 {
     const EmberAfCluster * cluster = FindServerCluster(before);

     VerifyOrReturnValue(cluster != nullptr, DataModel::CommandEntry::kInvalid);

     std::optional<CommandId> commandId = mAcceptedCommandsIterator.Next(cluster->acceptedCommandList, before.mCommandId);
     VerifyOrReturnValue(commandId.has_value(), DataModel::CommandEntry::kInvalid);

     return CommandEntryFrom(before, *commandId);
 }

 std::optional<DataModel::CommandInfo> CodegenDataModelProvider::GetAcceptedCommandInfo(const ConcreteCommandPath & path)
 {
     const EmberAfCluster * cluster = FindServerCluster(path);

     VerifyOrReturnValue(cluster != nullptr, std::nullopt);
     VerifyOrReturnValue(mAcceptedCommandsIterator.Exists(cluster->acceptedCommandList, path.mCommandId), std::nullopt);

     return CommandEntryFrom(path, path.mCommandId).info;
 }

 ConcreteCommandPath CodegenDataModelProvider::FirstGeneratedCommand(const ConcreteClusterPath & path)
 {
     const EmberAfCluster * cluster = FindServerCluster(path);

     VerifyOrReturnValue(cluster != nullptr, kInvalidCommandPath);

     std::optional<CommandId> commandId = mGeneratedCommandsIterator.First(cluster->generatedCommandList);
     VerifyOrReturnValue(commandId.has_value(), kInvalidCommandPath);
     return ConcreteCommandPath(path.mEndpointId, path.mClusterId, *commandId);
 }

 ConcreteCommandPath CodegenDataModelProvider::NextGeneratedCommand(const ConcreteCommandPath & before)
 {
     const EmberAfCluster * cluster = FindServerCluster(before);

     VerifyOrReturnValue(cluster != nullptr, kInvalidCommandPath);

     std::optional<CommandId> commandId = mGeneratedCommandsIterator.Next(cluster->generatedCommandList, before.mCommandId);
     VerifyOrReturnValue(commandId.has_value(), kInvalidCommandPath);

     return ConcreteCommandPath(before.mEndpointId, before.mClusterId, *commandId);
 }

 } // namespace app
 } // namespace chip
	/*
	* Copyright (c) 2024 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.
	*/
	#include <app/codegen-data-model-provider/CodegenDataModelProvider.h>

	#include <app-common/zap-generated/attribute-type.h>
	#include <app/RequiredPrivilege.h>
	#include <app/util/IMClusterCommandHandler.h>
	#include <app/util/attribute-storage.h>
	#include <app/util/endpoint-config-api.h>
	#include <lib/core/DataModelTypes.h>

	#include <optional>
	#include <variant>

	namespace chip {
	namespace app {
	namespace {

	/// Load the cluster information into the specified destination
	std::variant<CHIP_ERROR, DataModel::ClusterInfo> LoadClusterInfo(const ConcreteClusterPath & path, const EmberAfCluster & cluster)
	{
	DataVersion * versionPtr = emberAfDataVersionStorage(path);
	if (versionPtr == nullptr)
	{
	ChipLogError(AppServer, "Failed to get data version for %d/" ChipLogFormatMEI, static_cast<int>(path.mEndpointId),
	ChipLogValueMEI(cluster.clusterId));
	return CHIP_ERROR_NOT_FOUND;
	}

	DataModel::ClusterInfo info(*versionPtr);

	// TODO: set entry flags:
	// info->flags.Set(ClusterQualityFlags::kDiagnosticsData)

	return info;
	}

	/// Converts a EmberAfCluster into a ClusterEntry
	std::variant<CHIP_ERROR, DataModel::ClusterEntry> ClusterEntryFrom(EndpointId endpointId, const EmberAfCluster & cluster)
	{
	ConcreteClusterPath clusterPath(endpointId, cluster.clusterId);
	auto info = LoadClusterInfo(clusterPath, cluster);

	if (CHIP_ERROR * err = std::get_if<CHIP_ERROR>(&info))
	{
	return *err;
	}

	if (DataModel::ClusterInfo * infoValue = std::get_if<DataModel::ClusterInfo>(&info))
	{
	return DataModel::ClusterEntry{
	.path = clusterPath,
	.info = *infoValue,
	};
	}
	return CHIP_ERROR_INCORRECT_STATE;
	}

	/// Finds the first server cluster entry for the given endpoint data starting at [start_index]
	///
	/// Returns an invalid entry if no more server clusters are found
	DataModel::ClusterEntry FirstServerClusterEntry(EndpointId endpointId, const EmberAfEndpointType * endpoint, unsigned start_index,
	unsigned & found_index)
	{
	for (unsigned cluster_idx = start_index; cluster_idx < endpoint->clusterCount; cluster_idx++)
	{
	const EmberAfCluster & cluster = endpoint->cluster[cluster_idx];
	if (!cluster.IsServer())
	{
	continue;
	}

	found_index = cluster_idx;
	auto entry = ClusterEntryFrom(endpointId, cluster);

	if (DataModel::ClusterEntry * entryValue = std::get_if<DataModel::ClusterEntry>(&entry))
	{
	return *entryValue;
	}

	#if CHIP_ERROR_LOGGING
	if (CHIP_ERROR * errValue = std::get_if<CHIP_ERROR>(&entry))
	{
	ChipLogError(AppServer, "Failed to load cluster entry: %" CHIP_ERROR_FORMAT, errValue->Format());
	}
	else
	{
	// Should NOT be possible: entryFrom has only 2 variants
	ChipLogError(AppServer, "Failed to load cluster entry, UNKNOWN entry return type");
	}
	#endif
	}

	return DataModel::ClusterEntry::kInvalid;
	}

	/// Load the attribute information into the specified destination
	///
	/// `info` is assumed to be default-constructed/clear (i.e. this sets flags, but does not reset them).
	void LoadAttributeInfo(const ConcreteAttributePath & path, const EmberAfAttributeMetadata & attribute,
	DataModel::AttributeInfo * info)
	{
	info->readPrivilege = RequiredPrivilege::ForReadAttribute(path);
	if (!attribute.IsReadOnly())
	{
	info->writePrivilege = RequiredPrivilege::ForWriteAttribute(path);
	}

	info->flags.Set(DataModel::AttributeQualityFlags::kListAttribute, (attribute.attributeType == ZCL_ARRAY_ATTRIBUTE_TYPE));
	info->flags.Set(DataModel::AttributeQualityFlags::kTimed, attribute.MustUseTimedWrite());

	// NOTE: we do NOT provide additional info for:
	// - IsExternal/IsSingleton/IsAutomaticallyPersisted is not used by IM handling
	// - IsSingleton spec defines it for CLUSTERS where as we have it for ATTRIBUTES
	// - Several specification flags are not available (reportable, quieter reporting,
	// fixed, source attribution)

	// TODO: Set additional flags:
	// info->flags.Set(DataModel::AttributeQualityFlags::kFabricScoped)
	// info->flags.Set(DataModel::AttributeQualityFlags::kFabricSensitive)
	// info->flags.Set(DataModel::AttributeQualityFlags::kChangesOmitted)
	}

	DataModel::AttributeEntry AttributeEntryFrom(const ConcreteClusterPath & clusterPath, const EmberAfAttributeMetadata & attribute)
	{
	DataModel::AttributeEntry entry;

	entry.path = ConcreteAttributePath(clusterPath.mEndpointId, clusterPath.mClusterId, attribute.attributeId);
	LoadAttributeInfo(entry.path, attribute, &entry.info);

	return entry;
	}

	DataModel::CommandEntry CommandEntryFrom(const ConcreteClusterPath & clusterPath, CommandId clusterCommandId)
	{
	DataModel::CommandEntry entry;
	entry.path = ConcreteCommandPath(clusterPath.mEndpointId, clusterPath.mClusterId, clusterCommandId);
	entry.info.invokePrivilege = RequiredPrivilege::ForInvokeCommand(entry.path);

	entry.info.flags.Set(DataModel::CommandQualityFlags::kTimed, CommandNeedsTimedInvoke(clusterPath.mClusterId, clusterCommandId));

	entry.info.flags.Set(DataModel::CommandQualityFlags::kFabricScoped,
	CommandIsFabricScoped(clusterPath.mClusterId, clusterCommandId));

	return entry;
	}

	const ConcreteCommandPath kInvalidCommandPath(kInvalidEndpointId, kInvalidClusterId, kInvalidCommandId);

	} // namespace

	std::optional<CommandId> CodegenDataModelProvider::EmberCommandListIterator::First(const CommandId * list)
	{
	VerifyOrReturnValue(list != nullptr, std::nullopt);
	mCurrentList = mCurrentHint = list;

	VerifyOrReturnValue(*mCurrentList != kInvalidCommandId, std::nullopt);
	return *mCurrentList;
	}

	std::optional<CommandId> CodegenDataModelProvider::EmberCommandListIterator::Next(const CommandId * list, CommandId previousId)
	{
	VerifyOrReturnValue(list != nullptr, std::nullopt);
	VerifyOrReturnValue(previousId != kInvalidCommandId, std::nullopt);

	if (mCurrentList != list)
	{
	// invalidate the hint if switching lists...
	mCurrentHint = nullptr;
	mCurrentList = list;
	}

	if ((mCurrentHint == nullptr) \|\| (*mCurrentHint != previousId))
	{
	// we did not find a usable hint. Search from the to set the hint
	mCurrentHint = mCurrentList;
	while ((mCurrentHint != kInvalidCommandId) && (mCurrentHint != previousId))
	{
	mCurrentHint++;
	}
	}

	VerifyOrReturnValue(*mCurrentHint == previousId, std::nullopt);

	// hint is valid and can be used immediately
	mCurrentHint++; // this is the next value
	return (mCurrentHint == kInvalidCommandId) ? std::nullopt : std::make_optional(mCurrentHint);
	}

	bool CodegenDataModelProvider::EmberCommandListIterator::Exists(const CommandId * list, CommandId toCheck)
	{
	VerifyOrReturnValue(list != nullptr, false);
	VerifyOrReturnValue(toCheck != kInvalidCommandId, false);

	if (mCurrentList != list)
	{
	// invalidate the hint if switching lists...
	mCurrentHint = nullptr;
	mCurrentList = list;
	}

	// maybe already positioned correctly
	if ((mCurrentHint != nullptr) && (*mCurrentHint == toCheck))
	{
	return true;
	}

	// move and try to find it
	mCurrentHint = mCurrentList;
	while ((mCurrentHint != kInvalidCommandId) && (mCurrentHint != toCheck))
	{
	mCurrentHint++;
	}

	return (*mCurrentHint == toCheck);
	}

	DataModel::ActionReturnStatus CodegenDataModelProvider::Invoke(const DataModel::InvokeRequest & request,
	TLV::TLVReader & input_arguments, CommandHandler * handler)
	{
	// TODO: CommandHandlerInterface support is currently
	// residing in InteractionModelEngine itself. We may want to separate this out
	// into its own registry, similar to attributes, so that IM is decoupled from actual storage of things.
	//
	// Open issue at https://github.com/project-chip/connectedhomeip/issues/34258

	// Ember dispatching automatically uses `handler` to set an appropriate result or status
	// This never fails (as handler error is encoded as needed).
	DispatchSingleClusterCommand(request.path, input_arguments, handler);

	return CHIP_NO_ERROR;
	}

	EndpointId CodegenDataModelProvider::FirstEndpoint()
	{
	// find the first enabled index
	const uint16_t lastEndpointIndex = emberAfEndpointCount();
	for (uint16_t endpoint_idx = 0; endpoint_idx < lastEndpointIndex; endpoint_idx++)
	{
	if (emberAfEndpointIndexIsEnabled(endpoint_idx))
	{
	mEndpointIterationHint = endpoint_idx;
	return emberAfEndpointFromIndex(endpoint_idx);
	}
	}

	// No enabled endpoint found. Give up
	return kInvalidEndpointId;
	}

	std::optional<unsigned> CodegenDataModelProvider::TryFindEndpointIndex(EndpointId id) const
	{
	const uint16_t lastEndpointIndex = emberAfEndpointCount();

	if ((mEndpointIterationHint < lastEndpointIndex) && emberAfEndpointIndexIsEnabled(mEndpointIterationHint) &&
	(id == emberAfEndpointFromIndex(mEndpointIterationHint)))
	{
	return std::make_optional(mEndpointIterationHint);
	}

	// Linear search, this may be slow
	uint16_t idx = emberAfIndexFromEndpoint(id);
	if (idx == kEmberInvalidEndpointIndex)
	{
	return std::nullopt;
	}

	return std::make_optional<unsigned>(idx);
	}

	EndpointId CodegenDataModelProvider::NextEndpoint(EndpointId before)
	{
	const uint16_t lastEndpointIndex = emberAfEndpointCount();

	std::optional<unsigned> before_idx = TryFindEndpointIndex(before);
	if (!before_idx.has_value())
	{
	return kInvalidEndpointId;
	}

	// find the first enabled index
	for (uint16_t endpoint_idx = static_cast<uint16_t>(*before_idx + 1); endpoint_idx < lastEndpointIndex; endpoint_idx++)
	{
	if (emberAfEndpointIndexIsEnabled(endpoint_idx))
	{
	mEndpointIterationHint = endpoint_idx;
	return emberAfEndpointFromIndex(endpoint_idx);
	}
	}

	// No enabled enpoint after "before" was found, give up
	return kInvalidEndpointId;
	}

	DataModel::ClusterEntry CodegenDataModelProvider::FirstCluster(EndpointId endpointId)
	{
	const EmberAfEndpointType * endpoint = emberAfFindEndpointType(endpointId);
	VerifyOrReturnValue(endpoint != nullptr, DataModel::ClusterEntry::kInvalid);
	VerifyOrReturnValue(endpoint->clusterCount > 0, DataModel::ClusterEntry::kInvalid);
	VerifyOrReturnValue(endpoint->cluster != nullptr, DataModel::ClusterEntry::kInvalid);

	return FirstServerClusterEntry(endpointId, endpoint, 0, mClusterIterationHint);
	}

	std::optional<unsigned> CodegenDataModelProvider::TryFindServerClusterIndex(const EmberAfEndpointType * endpoint,
	ClusterId id) const
	{
	const unsigned clusterCount = endpoint->clusterCount;

	if (mClusterIterationHint < clusterCount)
	{
	const EmberAfCluster & cluster = endpoint->cluster[mClusterIterationHint];
	if (cluster.IsServer() && (cluster.clusterId == id))
	{
	return std::make_optional(mClusterIterationHint);
	}
	}

	// linear search, this may be slow
	// does NOT use emberAfClusterIndex to not iterate over endpoints as we have
	// already found the correct endpoint
	for (unsigned cluster_idx = 0; cluster_idx < clusterCount; cluster_idx++)
	{
	const EmberAfCluster & cluster = endpoint->cluster[cluster_idx];
	if (cluster.IsServer() && (cluster.clusterId == id))
	{
	return std::make_optional(cluster_idx);
	}
	}

	return std::nullopt;
	}

	DataModel::ClusterEntry CodegenDataModelProvider::NextCluster(const ConcreteClusterPath & before)
	{
	// TODO: This search still seems slow (ember will loop). Should use index hints as long
	// as ember API supports it
	const EmberAfEndpointType * endpoint = emberAfFindEndpointType(before.mEndpointId);

	VerifyOrReturnValue(endpoint != nullptr, DataModel::ClusterEntry::kInvalid);
	VerifyOrReturnValue(endpoint->clusterCount > 0, DataModel::ClusterEntry::kInvalid);
	VerifyOrReturnValue(endpoint->cluster != nullptr, DataModel::ClusterEntry::kInvalid);

	std::optional<unsigned> cluster_idx = TryFindServerClusterIndex(endpoint, before.mClusterId);
	if (!cluster_idx.has_value())
	{
	return DataModel::ClusterEntry::kInvalid;
	}

	return FirstServerClusterEntry(before.mEndpointId, endpoint, *cluster_idx + 1, mClusterIterationHint);
	}

	std::optional<DataModel::ClusterInfo> CodegenDataModelProvider::GetClusterInfo(const ConcreteClusterPath & path)
	{
	const EmberAfCluster * cluster = FindServerCluster(path);

	VerifyOrReturnValue(cluster != nullptr, std::nullopt);

	auto info = LoadClusterInfo(path, *cluster);

	if (CHIP_ERROR * err = std::get_if<CHIP_ERROR>(&info))
	{
	#if CHIP_ERROR_LOGGING
	ChipLogError(AppServer, "Failed to load cluster info: %" CHIP_ERROR_FORMAT, err->Format());
	#else
	(void) err->Format();
	#endif
	return std::nullopt;
	}

	return std::make_optional(std::get<DataModel::ClusterInfo>(info));
	}

	DataModel::AttributeEntry CodegenDataModelProvider::FirstAttribute(const ConcreteClusterPath & path)
	{
	const EmberAfCluster * cluster = FindServerCluster(path);

	VerifyOrReturnValue(cluster != nullptr, DataModel::AttributeEntry::kInvalid);
	VerifyOrReturnValue(cluster->attributeCount > 0, DataModel::AttributeEntry::kInvalid);
	VerifyOrReturnValue(cluster->attributes != nullptr, DataModel::AttributeEntry::kInvalid);

	mAttributeIterationHint = 0;
	return AttributeEntryFrom(path, cluster->attributes[0]);
	}

	std::optional<unsigned> CodegenDataModelProvider::TryFindAttributeIndex(const EmberAfCluster * cluster, AttributeId id) const
	{
	const unsigned attributeCount = cluster->attributeCount;

	// attempt to find this based on the embedded hint
	if ((mAttributeIterationHint < attributeCount) && (cluster->attributes[mAttributeIterationHint].attributeId == id))
	{
	return std::make_optional(mAttributeIterationHint);
	}

	// linear search is required. This may be slow
	for (unsigned attribute_idx = 0; attribute_idx < attributeCount; attribute_idx++)
	{

	if (cluster->attributes[attribute_idx].attributeId == id)
	{
	return std::make_optional(attribute_idx);
	}
	}

	return std::nullopt;
	}

	const EmberAfCluster * CodegenDataModelProvider::FindServerCluster(const ConcreteClusterPath & path)
	{
	// cache things
	if (mPreviouslyFoundCluster.has_value() && (mPreviouslyFoundCluster->path == path))
	{
	return mPreviouslyFoundCluster->cluster;
	}

	const EmberAfCluster * cluster = emberAfFindServerCluster(path.mEndpointId, path.mClusterId);
	if (cluster != nullptr)
	{
	mPreviouslyFoundCluster = std::make_optional<ClusterReference>(path, cluster);
	}
	return cluster;
	}

	DataModel::AttributeEntry CodegenDataModelProvider::NextAttribute(const ConcreteAttributePath & before)
	{
	const EmberAfCluster * cluster = FindServerCluster(before);
	VerifyOrReturnValue(cluster != nullptr, DataModel::AttributeEntry::kInvalid);
	VerifyOrReturnValue(cluster->attributeCount > 0, DataModel::AttributeEntry::kInvalid);
	VerifyOrReturnValue(cluster->attributes != nullptr, DataModel::AttributeEntry::kInvalid);

	// find the given attribute in the list and then return the next one
	std::optional<unsigned> attribute_idx = TryFindAttributeIndex(cluster, before.mAttributeId);
	if (!attribute_idx.has_value())
	{
	return DataModel::AttributeEntry::kInvalid;
	}

	unsigned next_idx = *attribute_idx + 1;
	if (next_idx < cluster->attributeCount)
	{
	mAttributeIterationHint = next_idx;
	return AttributeEntryFrom(before, cluster->attributes[next_idx]);
	}

	// iteration complete
	return DataModel::AttributeEntry::kInvalid;
	}

	std::optional<DataModel::AttributeInfo> CodegenDataModelProvider::GetAttributeInfo(const ConcreteAttributePath & path)
	{
	const EmberAfCluster * cluster = FindServerCluster(path);

	VerifyOrReturnValue(cluster != nullptr, std::nullopt);
	VerifyOrReturnValue(cluster->attributeCount > 0, std::nullopt);
	VerifyOrReturnValue(cluster->attributes != nullptr, std::nullopt);

	std::optional<unsigned> attribute_idx = TryFindAttributeIndex(cluster, path.mAttributeId);

	if (!attribute_idx.has_value())
	{
	return std::nullopt;
	}

	DataModel::AttributeInfo info;
	LoadAttributeInfo(path, cluster->attributes[*attribute_idx], &info);
	return std::make_optional(info);
	}

	DataModel::CommandEntry CodegenDataModelProvider::FirstAcceptedCommand(const ConcreteClusterPath & path)
	{
	const EmberAfCluster * cluster = FindServerCluster(path);

	VerifyOrReturnValue(cluster != nullptr, DataModel::CommandEntry::kInvalid);

	std::optional<CommandId> commandId = mAcceptedCommandsIterator.First(cluster->acceptedCommandList);
	VerifyOrReturnValue(commandId.has_value(), DataModel::CommandEntry::kInvalid);

	return CommandEntryFrom(path, *commandId);
	}

	DataModel::CommandEntry CodegenDataModelProvider::NextAcceptedCommand(const ConcreteCommandPath & before)
	{
	const EmberAfCluster * cluster = FindServerCluster(before);

	VerifyOrReturnValue(cluster != nullptr, DataModel::CommandEntry::kInvalid);

	std::optional<CommandId> commandId = mAcceptedCommandsIterator.Next(cluster->acceptedCommandList, before.mCommandId);
	VerifyOrReturnValue(commandId.has_value(), DataModel::CommandEntry::kInvalid);

	return CommandEntryFrom(before, *commandId);
	}

	std::optional<DataModel::CommandInfo> CodegenDataModelProvider::GetAcceptedCommandInfo(const ConcreteCommandPath & path)
	{
	const EmberAfCluster * cluster = FindServerCluster(path);

	VerifyOrReturnValue(cluster != nullptr, std::nullopt);
	VerifyOrReturnValue(mAcceptedCommandsIterator.Exists(cluster->acceptedCommandList, path.mCommandId), std::nullopt);

	return CommandEntryFrom(path, path.mCommandId).info;
	}

	ConcreteCommandPath CodegenDataModelProvider::FirstGeneratedCommand(const ConcreteClusterPath & path)
	{
	const EmberAfCluster * cluster = FindServerCluster(path);

	VerifyOrReturnValue(cluster != nullptr, kInvalidCommandPath);

	std::optional<CommandId> commandId = mGeneratedCommandsIterator.First(cluster->generatedCommandList);
	VerifyOrReturnValue(commandId.has_value(), kInvalidCommandPath);
	return ConcreteCommandPath(path.mEndpointId, path.mClusterId, *commandId);
	}

	ConcreteCommandPath CodegenDataModelProvider::NextGeneratedCommand(const ConcreteCommandPath & before)
	{
	const EmberAfCluster * cluster = FindServerCluster(before);

	VerifyOrReturnValue(cluster != nullptr, kInvalidCommandPath);

	std::optional<CommandId> commandId = mGeneratedCommandsIterator.Next(cluster->generatedCommandList, before.mCommandId);
	VerifyOrReturnValue(commandId.has_value(), kInvalidCommandPath);

	return ConcreteCommandPath(before.mEndpointId, before.mClusterId, *commandId);
	}

	} // namespace app
	} // namespace chip