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// Copyright 2020 The Pigweed Authors
//
// 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
//
// https://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 "pw_rpc/internal/method.h"
namespace pw::rpc::internal {
// Gets a Method object from a generated RPC service class. Getter functions are
// provided for each supported method implementation. The
//
// To ensure the MethodUnion actually holds the requested method type, the
// method ID is accessed in a static_assert. It is invalid to access an unset
// union member in a constant expression, so this results in a compiler error.
class MethodLookup {
public:
MethodLookup() = delete;
template <typename Service, uint32_t kMethodId>
static constexpr const auto& GetRawMethod() {
const auto& method = GetMethodUnion<Service, kMethodId>().raw_method();
static_assert(method.id() == kMethodId, "Incorrect method implementation");
return method;
}
template <typename Service, uint32_t kMethodId>
static constexpr const auto& GetPwpbMethod() {
const auto& method = GetMethodUnion<Service, kMethodId>().pwpb_method();
static_assert(method.id() == kMethodId, "Incorrect method implementation");
return method;
}
template <typename Service, uint32_t kMethodId>
static constexpr const auto& GetNanopbMethod() {
const auto& method = GetMethodUnion<Service, kMethodId>().nanopb_method();
static_assert(method.id() == kMethodId, "Incorrect method implementation");
return method;
}
private:
template <typename Service, uint32_t kMethodId>
static constexpr const auto& GetMethodUnion() {
constexpr auto method = GetMethodUnionPointer<Service>(kMethodId);
// TODO: b/285367496 - Remove this #ifndef guard when the static assert
// compiles correctly when using the Andestech RISC-V GCC 10.3.0 toolchain.
#if !(defined(__riscv) && defined(__nds_v5) && (__GNUC__ == 10) && \
(__GNUC_MINOR__ == 3) && (__GNUC_PATCHLEVEL__ == 0))
static_assert(method != nullptr,
"The selected function is not an RPC service method");
#endif // !(defined(__riscv) && defined(__nds_v5) && (__GNUC__ == 10)
// && (__GNUC_MINOR__ == 3) && (__GNUC_PATCHLEVEL__ == 0))
return *method;
}
template <typename Service>
static constexpr typename decltype(Service::kPwRpcMethods)::const_pointer
GetMethodUnionPointer(uint32_t kMethodId) {
for (size_t i = 0; i < Service::kPwRpcMethodIds.size(); ++i) {
if (Service::kPwRpcMethodIds[i] == kMethodId) {
return &Service::kPwRpcMethods[i];
}
}
return nullptr;
}
};
} // namespace pw::rpc::internal
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