Matter SDK Coverage Report
Current view: top level - app/server-cluster - ServerClusterInterface.h (source / functions) Coverage Total Hit
Test: SHA:4d2388ac7eed75b2fe5e05e20de377999c632502 Lines: 100.0 % 2 2
Test Date: 2025-07-27 07:17:09 Functions: 66.7 % 3 2

            Line data    Source code
       1              : /*
       2              :  *    Copyright (c) 2025 Project CHIP Authors
       3              :  *    All rights reserved.
       4              :  *
       5              :  *    Licensed under the Apache License, Version 2.0 (the "License");
       6              :  *    you may not use this file except in compliance with the License.
       7              :  *    You may obtain a copy of the License at
       8              :  *
       9              :  *        http://www.apache.org/licenses/LICENSE-2.0
      10              :  *
      11              :  *    Unless required by applicable law or agreed to in writing, software
      12              :  *    distributed under the License is distributed on an "AS IS" BASIS,
      13              :  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      14              :  *    See the License for the specific language governing permissions and
      15              :  *    limitations under the License.
      16              :  */
      17              : #pragma once
      18              : 
      19              : #include <app/AttributeValueDecoder.h>
      20              : #include <app/AttributeValueEncoder.h>
      21              : #include <app/CommandHandler.h>
      22              : #include <app/ConcreteClusterPath.h>
      23              : #include <app/data-model-provider/ActionReturnStatus.h>
      24              : #include <app/data-model-provider/MetadataTypes.h>
      25              : #include <app/data-model-provider/OperationTypes.h>
      26              : #include <app/server-cluster/ServerClusterContext.h>
      27              : #include <lib/core/CHIPError.h>
      28              : #include <lib/core/DataModelTypes.h>
      29              : #include <lib/support/BitFlags.h>
      30              : #include <lib/support/ReadOnlyBuffer.h>
      31              : 
      32              : namespace chip {
      33              : namespace app {
      34              : 
      35              : /// Handles cluster interactions for a specific set of cluster instances
      36              : ///
      37              : /// A `ServerClusterInterface` instance may be associated with multiple `endpointId/clusterId` paths.
      38              : ///
      39              : /// Provides metadata as well as interaction processing (attribute read/write and command handling).
      40              : class ServerClusterInterface
      41              : {
      42              : public:
      43          571 :     virtual ~ServerClusterInterface() = default;
      44              : 
      45              :     /// Starts up the server cluster interface.
      46              :     ///
      47              :     /// The `context` lifetime must be guaranteed to last
      48              :     /// until `Shutdown` is called:
      49              :     ///
      50              :     /// - You are allowed to take and use a pointer to it until
      51              :     ///   shutdown is called.
      52              :     /// - If context is needed, you SHOULD store a pointer rather
      53              :     ///   than a copy to save RAM usage.
      54              :     virtual CHIP_ERROR Startup(ServerClusterContext & context) = 0;
      55              : 
      56              :     /// A shutdown will always be paired with a corresponding Startup.
      57              :     virtual void Shutdown() = 0;
      58              : 
      59              :     ///////////////////////////////////// Cluster Metadata Support //////////////////////////////////////////////////
      60              : 
      61              :     /// The paths that this cluster interfaces handles.
      62              :     ///
      63              :     /// - MUST contain at least one element
      64              :     /// - MUST remain constant once the server cluster interface is in use.
      65              :     ///
      66              :     [[nodiscard]] virtual Span<const ConcreteClusterPath> GetPaths() const = 0;
      67              : 
      68              :     /// Gets the data version for this cluster instance.
      69              :     ///
      70              :     /// Every cluster instance must have a data version.
      71              :     ///
      72              :     /// SPEC - 7.10.3. Cluster Data Version
      73              :     ///   A cluster data version is a metadata increment-only counter value, maintained for each cluster instance.
      74              :     ///   [...]
      75              :     ///   A cluster data version SHALL increment or be set (wrap) to zero if incrementing would exceed its
      76              :     ///   maximum value. A cluster data version SHALL be maintained for each cluster instance.
      77              :     ///   [...]
      78              :     ///   A cluster data version SHALL be incremented if any attribute data changes.
      79              :     ///
      80              :     /// Precondition:
      81              :     ///   - `path` parameter MUST match one of the paths returned by GetPaths.
      82              :     [[nodiscard]] virtual DataVersion GetDataVersion(const ConcreteClusterPath & path) const = 0;
      83              : 
      84              :     /// Precondition:
      85              :     ///   - `path` parameter MUST match one of the paths returned by GetPaths.
      86              :     [[nodiscard]] virtual BitFlags<DataModel::ClusterQualityFlags> GetClusterFlags(const ConcreteClusterPath &) const = 0;
      87              : 
      88              :     ///////////////////////////////////// Attribute Support ////////////////////////////////////////////////////////
      89              : 
      90              :     ///   Indicates the start/end of a series of list operations. This function will be called either before the first
      91              :     ///   Write operation or after the last one of a series of consecutive attribute data values received for the same attribute.
      92              :     ///
      93              :     ///   1) This function will be called if the client tries to set a nullable list attribute to null.
      94              :     ///   2) This function will only be called at the beginning and end of a series of consecutive attribute data
      95              :     ///   blocks for the same attribute, no matter what list operations those data blocks represent.
      96              :     ///   3) The opType argument indicates the type of notification (Start, Failure, Success).
      97              :     ///
      98              :     /// Precondition:
      99              :     ///   - `path` endpoint+cluster part MUST match one of the paths returned by GetPaths.
     100            4 :     virtual void ListAttributeWriteNotification(const ConcreteAttributePath & path, DataModel::ListWriteOperation opType) {}
     101              : 
     102              :     /// Reads the value of an existing attribute.
     103              :     ///
     104              :     /// ReadAttribute MUST be done on an "existent" attribute path: only on attributes that are
     105              :     /// returned in an `Attributes` call for this cluster.  ReadAttribute is not expected to perform
     106              :     /// that verification; the caller is responsible for it.
     107              :     ///
     108              :     /// `request.path` is expected to have `GetClusterId` as the cluster id as well as an attribute that is
     109              :     /// included in an `Attributes` call.
     110              :     ///
     111              :     /// This MUST HANDLE the following global attributes:
     112              :     ///   - FeatureMap::Id
     113              :     ///   - ClusterRevision::Id
     114              :     ///
     115              :     /// This function WILL NOT be called for attributes that can be derived from cluster metadata.
     116              :     /// Specifically this WILL NOT be called (and does not need to implement handling for) the
     117              :     /// following attribute IDs:
     118              :     ///     - AcceptedCommandList::Id
     119              :     ///     - AttributeList::Id
     120              :     ///     - GeneratedCommandList::Id
     121              :     ///
     122              :     /// Precondition:
     123              :     ///   - `request.path` endpoint+cluster part MUST match one of the paths returned by GetPaths.
     124              :     virtual DataModel::ActionReturnStatus ReadAttribute(const DataModel::ReadAttributeRequest & request,
     125              :                                                         AttributeValueEncoder & encoder) = 0;
     126              : 
     127              :     /// Writes a value to an existing attribute.
     128              :     ///
     129              :     /// WriteAttribute MUST be done on an "existent" attribute path: only on attributes that are
     130              :     /// returned in an `Attributes` call for this cluster.  WriteAttribute is not expected to perform
     131              :     /// that verification; the caller is responsible for it.
     132              :     ///
     133              :     /// `request.path` is expected to have `GetClusterId` as the cluster id as well as an attribute that is
     134              :     /// included in a `Attributes` call.
     135              :     ///
     136              :     /// Precondition:
     137              :     ///   - `request.path` endpoint+cluster part MUST match one of the paths returned by GetPaths.
     138              :     virtual DataModel::ActionReturnStatus WriteAttribute(const DataModel::WriteAttributeRequest & request,
     139              :                                                          AttributeValueDecoder & decoder) = 0;
     140              : 
     141              :     /// Retrieves the list of attributes supported by this cluster.
     142              :     ///
     143              :     /// Attribute list MUST contain global attributes.
     144              :     ///
     145              :     /// Specifically these attributes MUST always exist in the list for all clusters:
     146              :     ///     - ClusterRevision::Id
     147              :     ///     - FeatureMap::Id
     148              :     ///     - AcceptedCommandList::Id
     149              :     ///     - AttributeList::Id
     150              :     ///     - GeneratedCommandList::Id
     151              :     /// See SPEC 7.13 Global Elements: `Global Attributes` table
     152              :     ///
     153              :     /// Precondition:
     154              :     ///   - `path` MUST match one of the paths returned by GetPaths.
     155              :     virtual CHIP_ERROR Attributes(const ConcreteClusterPath & path, ReadOnlyBufferBuilder<DataModel::AttributeEntry> & builder) = 0;
     156              : 
     157              :     /// Retrieve information about a specific generated event.
     158              :     ///
     159              :     /// In particular information regarding access, so that event reads can be validated.
     160              :     virtual CHIP_ERROR EventInfo(const ConcreteEventPath & path, DataModel::EventEntry & eventInfo) = 0;
     161              : 
     162              :     ///////////////////////////////////// Command Support /////////////////////////////////////////////////////////
     163              : 
     164              :     /// Handles the invocation of a command.
     165              :     ///
     166              :     /// `handler` is used to send back the response.
     167              :     ///    - returning `nullopt` means that return value was placed in handler directly.
     168              :     ///      This includes cases where command handling and value return will be done asynchronously.
     169              :     ///    - returning a value other than Success implies an error reply (error and data are mutually exclusive)
     170              :     ///
     171              :     /// InvokeCommand MUST be done on an "existent" attribute path: only on commands that are
     172              :     /// returned in an `AcceptedCommand` call for this cluster.
     173              :     ///
     174              :     /// Return value expectations:
     175              :     ///   - if a response has been placed into `handler` then std::nullopt MUST be returned. In particular
     176              :     ///     note that CHIP_NO_ERROR is NOT the same as std::nullopt:
     177              :     ///        > CHIP_NO_ERROR means handler had no status set and we expect the caller to AddStatus(success)
     178              :     ///        > std::nullopt means that handler has added an appropriate data/status response
     179              :     ///   - if a value is returned (not nullopt) then the handler response MUST NOT be filled. The caller
     180              :     ///     will then issue `handler->AddStatus(request.path, <return_value>->GetStatusCode())`. This is a
     181              :     ///     convenience to make writing Invoke calls easier.
     182              :     ///
     183              :     /// Precondition:
     184              :     ///   - `request.path` endpoint+cluster part MUST match one of the paths returned by GetPaths.
     185              :     virtual std::optional<DataModel::ActionReturnStatus>
     186              :     InvokeCommand(const DataModel::InvokeRequest & request, chip::TLV::TLVReader & input_arguments, CommandHandler * handler) = 0;
     187              : 
     188              :     /// Retrieves a list of commands accepted by this cluster.
     189              :     ///
     190              :     /// Returning `CHIP_NO_ERROR` without adding anything to the `builder` list is expected
     191              :     /// if no commands are supported by the cluster.
     192              :     ///
     193              :     /// Precondition:
     194              :     ///   - `path` MUST match one of the paths returned by GetPaths.
     195              :     virtual CHIP_ERROR AcceptedCommands(const ConcreteClusterPath & path,
     196              :                                         ReadOnlyBufferBuilder<DataModel::AcceptedCommandEntry> & builder) = 0;
     197              : 
     198              :     /// Retrieves a list of commands generated by this cluster.
     199              :     ///
     200              :     /// Returning `CHIP_NO_ERROR` without adding anything to the `builder` list is expected
     201              :     /// if no commands are generated by processing accepted commands.
     202              :     ///
     203              :     /// Precondition:
     204              :     ///   - `path` MUST match one of the paths returned by GetPaths.
     205              :     virtual CHIP_ERROR GeneratedCommands(const ConcreteClusterPath & path, ReadOnlyBufferBuilder<CommandId> & builder) = 0;
     206              : 
     207              :     /// Returns whether `GetPaths` contains the given path
     208              :     bool PathsContains(const ConcreteClusterPath & path);
     209              : };
     210              : 
     211              : } // namespace app
     212              : } // namespace chip
        

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