examples/common/pigweed/rpc_services/Attributes.h

/*
 *
 *    Copyright (c) 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.
 */

#pragma once

#include "attributes_service/attributes_service.rpc.pb.h"
#include "pigweed/rpc_services/internal/StatusUtils.h"

#include <app-common/zap-generated/attribute-type.h>
#include <app/InteractionModelEngine.h>
#include <app/MessageDef/AttributeReportIBs.h>
#include <app/util/attribute-storage.h>
#include <app/util/attribute-table.h>
#include <app/util/ember-compatibility-functions.h>
#include <lib/core/TLV.h>
#include <lib/core/TLVTags.h>
#include <lib/core/TLVTypes.h>
#include <platform/PlatformManager.h>

namespace chip {
namespace rpc {

// Implementation class for chip.rpc.Attributes.
class Attributes : public pw_rpc::nanopb::Attributes::Service<Attributes>
{
public:
    ::pw::Status Write(const chip_rpc_AttributeWrite & request, pw_protobuf_Empty & response)
    {
        const void * data;
        DeviceLayer::StackLock lock;

        switch (request.data.which_data)
        {
        case chip_rpc_AttributeData_data_bool_tag:
            data = &request.data.data.data_bool;
            break;
        case chip_rpc_AttributeData_data_uint8_tag:
            data = &request.data.data.data_uint8;
            break;
        case chip_rpc_AttributeData_data_uint16_tag:
            data = &request.data.data.data_uint16;
            break;
        case chip_rpc_AttributeData_data_uint32_tag:
            data = &request.data.data.data_uint32;
            break;
        case chip_rpc_AttributeData_data_int8_tag:
            data = &request.data.data.data_int8;
            break;
        case chip_rpc_AttributeData_data_int16_tag:
            data = &request.data.data.data_int16;
            break;
        case chip_rpc_AttributeData_data_int32_tag:
            data = &request.data.data.data_int32;
            break;
        case chip_rpc_AttributeData_data_bytes_tag:
            data = &request.data.data.data_bytes;
            break;
        default:
            return pw::Status::InvalidArgument();
        }
        RETURN_STATUS_IF_NOT_OK(
            emberAfWriteAttribute(request.metadata.endpoint, request.metadata.cluster, request.metadata.attribute_id,
                                  const_cast<uint8_t *>(static_cast<const uint8_t *>(data)), request.metadata.type));
        return pw::OkStatus();
    }

    ::pw::Status Read(const chip_rpc_AttributeMetadata & request, chip_rpc_AttributeData & response)
    {
        app::ConcreteAttributePath path(request.endpoint, request.cluster, request.attribute_id);
        MutableByteSpan tlvBuffer(response.tlv_data.bytes);
        PW_TRY(ReadAttributeIntoTlvBuffer(path, tlvBuffer));
        response.tlv_data.size = tlvBuffer.size();
        response.has_tlv_data  = true;

        switch (request.type)
        {
        case chip_rpc_AttributeType_ZCL_BOOLEAN_ATTRIBUTE_TYPE:
            PW_TRY(TlvBufferGetData(tlvBuffer, TLV::kTLVType_Boolean, response.data.data_bool));
            response.which_data = chip_rpc_AttributeData_data_bool_tag;
            break;
        case chip_rpc_AttributeType_ZCL_ENUM8_ATTRIBUTE_TYPE:
            PW_TRY(TlvBufferGetData(tlvBuffer, TLV::kTLVType_UnsignedInteger, response.data.data_uint8));
            response.which_data = chip_rpc_AttributeData_data_uint8_tag;
            break;
        case chip_rpc_AttributeType_ZCL_ENUM16_ATTRIBUTE_TYPE:
            PW_TRY(TlvBufferGetData(tlvBuffer, TLV::kTLVType_UnsignedInteger, response.data.data_uint16));
            response.which_data = chip_rpc_AttributeData_data_uint16_tag;
            break;
        case chip_rpc_AttributeType_ZCL_INT8U_ATTRIBUTE_TYPE:
            PW_TRY(TlvBufferGetData(tlvBuffer, TLV::kTLVType_UnsignedInteger, response.data.data_uint8));
            response.which_data = chip_rpc_AttributeData_data_uint8_tag;
            break;
        case chip_rpc_AttributeType_ZCL_INT16U_ATTRIBUTE_TYPE:
            PW_TRY(TlvBufferGetData(tlvBuffer, TLV::kTLVType_UnsignedInteger, response.data.data_uint16));
            response.which_data = chip_rpc_AttributeData_data_uint16_tag;
            break;
        case chip_rpc_AttributeType_ZCL_INT32U_ATTRIBUTE_TYPE:
            PW_TRY(TlvBufferGetData(tlvBuffer, TLV::kTLVType_UnsignedInteger, response.data.data_uint32));
            response.which_data = chip_rpc_AttributeData_data_uint32_tag;
            break;
        case chip_rpc_AttributeType_ZCL_INT8S_ATTRIBUTE_TYPE:
            PW_TRY(TlvBufferGetData(tlvBuffer, TLV::kTLVType_SignedInteger, response.data.data_int8));
            response.which_data = chip_rpc_AttributeData_data_int8_tag;
            break;
        case chip_rpc_AttributeType_ZCL_INT16S_ATTRIBUTE_TYPE:
            PW_TRY(TlvBufferGetData(tlvBuffer, TLV::kTLVType_SignedInteger, response.data.data_int16));
            response.which_data = chip_rpc_AttributeData_data_int16_tag;
            break;
        case chip_rpc_AttributeType_ZCL_INT32S_ATTRIBUTE_TYPE:
            PW_TRY(TlvBufferGetData(tlvBuffer, TLV::kTLVType_SignedInteger, response.data.data_int32));
            response.which_data = chip_rpc_AttributeData_data_int32_tag;
            break;
        case chip_rpc_AttributeType_ZCL_BITMAP8_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_BITMAP16_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_BITMAP32_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_ARRAY_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_BITMAP64_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_INT24U_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_INT40U_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_INT48U_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_INT56U_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_INT64U_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_INT24S_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_INT40S_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_INT48S_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_INT56S_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_INT64S_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_SINGLE_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_DOUBLE_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_OCTET_STRING_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_CHAR_STRING_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_LONG_OCTET_STRING_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_LONG_CHAR_STRING_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_STRUCT_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_TOD_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_DATE_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_UTC_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_EPOCH_US_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_EPOCH_S_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_SYSTIME_US_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_PERCENT_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_PERCENT100THS_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_CLUSTER_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_ATTRIB_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_FIELD_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_EVENT_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_COMMAND_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_ACTION_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_TRANS_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_NODE_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_VENDOR_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_DEVTYPE_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_FABRIC_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_GROUP_ID_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_STATUS_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_DATA_VER_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_EVENT_NO_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_ENDPOINT_NO_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_FABRIC_IDX_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_IPADR_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_IPV4ADR_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_IPV6ADR_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_IPV6PRE_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_HWADR_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_NO_DATA_ATTRIBUTE_TYPE:
        case chip_rpc_AttributeType_ZCL_UNKNOWN_ATTRIBUTE_TYPE:
        default:
            break;
            // These are currently not returned as decoded data, but can be
            // decoded from the returned TLV data.
        }

        return pw::OkStatus();
    }

private:
    static constexpr uint8_t kReportContextTag = 0x01;

    ::pw::Status ReadAttributeIntoTlvBuffer(const app::ConcreteAttributePath & path, MutableByteSpan & tlvBuffer)
    {
        Access::SubjectDescriptor subjectDescriptor{ .authMode = chip::Access::AuthMode::kPase };
        app::AttributeReportIBs::Builder attributeReports;
        TLV::TLVWriter writer;
        TLV::TLVType outer;
        DeviceLayer::StackLock lock;

        writer.Init(tlvBuffer);
        PW_TRY(ChipErrorToPwStatus(writer.StartContainer(TLV::AnonymousTag(), TLV::kTLVType_Structure, outer)));
        PW_TRY(ChipErrorToPwStatus(attributeReports.Init(&writer, kReportContextTag)));
        PW_TRY(ChipErrorToPwStatus(app::ReadSingleClusterData(subjectDescriptor, false, path, attributeReports, nullptr)));
        attributeReports.EndOfContainer();
        PW_TRY(ChipErrorToPwStatus(writer.EndContainer(outer)));
        PW_TRY(ChipErrorToPwStatus(writer.Finalize()));
        tlvBuffer.reduce_size(writer.GetLengthWritten());

        return ::pw::OkStatus();
    }

    template <typename T>
    ::pw::Status TlvBufferGetData(ByteSpan tlvBuffer, TLV::TLVType expectedDataType, T & responseData)
    {
        TLV::TLVReader reader;
        reader.Init(tlvBuffer);
        // Open outer container
        PW_TRY(ChipErrorToPwStatus(reader.Next(TLV::TLVType::kTLVType_Structure, TLV::AnonymousTag())));
        TLV::TLVType readerRoot;
        PW_TRY(ChipErrorToPwStatus(reader.EnterContainer(readerRoot)));

        // Open report container
        PW_TRY(ChipErrorToPwStatus(reader.Next(TLV::TLVType::kTLVType_Array, TLV::ContextTag(kReportContextTag))));
        TLV::TLVType readerArray;
        PW_TRY(ChipErrorToPwStatus(reader.EnterContainer(readerArray)));

        // Skip first array element which is the empty array from spec 10.5.4.3
        PW_TRY(ChipErrorToPwStatus(reader.Next(TLV::TLVType::kTLVType_Structure, TLV::AnonymousTag())));

        // Parse the AttributeDataIB to pull out data
        app::AttributeReportIB::Parser reportParser;
        PW_TRY(ChipErrorToPwStatus(reportParser.Init(reader)));
        app::AttributeDataIB::Parser dataParser;
        PW_TRY(ChipErrorToPwStatus(reportParser.GetAttributeData(&dataParser)));
        TLV::TLVReader dataReader;
        PW_TRY(ChipErrorToPwStatus(dataParser.GetData(&dataReader)));
        PW_TRY(CheckTlvTagAndType(&dataReader, TLV::ContextTag(0x2), expectedDataType));
        PW_TRY(ChipErrorToPwStatus(dataReader.Get(responseData)));

        return ::pw::OkStatus();
    }

    static ::pw::Status ChipErrorToPwStatus(CHIP_ERROR err)
    {
        if (err == CHIP_NO_ERROR)
        {
            return ::pw::OkStatus();
        }
        else if (err == CHIP_ERROR_BUFFER_TOO_SMALL)
        {
            return ::pw::Status::ResourceExhausted();
        }
        return ::pw::Status::Internal();
    }

    static ::pw::Status CheckTlvTagAndType(TLV::TLVReader * reader, TLV::Tag expectedTag, TLV::TLVType expectedType)
    {
        if (reader->GetTag() != expectedTag || reader->GetType() != expectedType)
        {
            return ::pw::Status::NotFound();
        }
        return ::pw::OkStatus();
    }
};

} // namespace rpc
} // namespace chip