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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 <cstdint>
#include <limits>
#include <span>
#include "pw_containers/intrusive_list.h"
#include "pw_preprocessor/compiler.h"
#include "pw_rpc/internal/method.h"
#include "pw_rpc/internal/method_union.h"
namespace pw::rpc {
// Base class for all RPC services. This cannot be instantiated directly; use a
// generated subclass instead.
//
// Services store a span of concrete method implementation classes. To support
// different Method implementations, Service stores a base MethodUnion* and the
// size of the concrete MethodUnion object.
class Service : public IntrusiveList<Service>::Item {
public:
Service(const Service&) = delete;
Service(Service&&) = delete;
Service& operator=(const Service&) = delete;
Service& operator=(Service&&) = delete;
uint32_t id() const { return id_; }
protected:
template <typename T, size_t kMethodCount>
constexpr Service(uint32_t id, const std::array<T, kMethodCount>& methods)
: id_(id),
methods_(methods.data()),
method_size_(sizeof(T)),
method_count_(static_cast<uint16_t>(kMethodCount)) {
PW_MODIFY_DIAGNOSTICS_PUSH();
// GCC 10 emits spurious -Wtype-limits warnings for the static_assert.
PW_MODIFY_DIAGNOSTIC_GCC(ignored, "-Wtype-limits");
static_assert(kMethodCount <= std::numeric_limits<uint16_t>::max());
PW_MODIFY_DIAGNOSTICS_POP();
}
// For use by tests with only one method.
template <typename T>
constexpr Service(uint32_t id, const T& method)
: id_(id), methods_(&method), method_size_(sizeof(T)), method_count_(1) {}
private:
friend class Server;
friend class ServiceTestHelper;
// Finds the method with the provided method_id. Returns nullptr if no match.
const internal::Method* FindMethod(uint32_t method_id) const;
const uint32_t id_;
const internal::MethodUnion* const methods_;
const uint16_t method_size_;
const uint16_t method_count_;
};
} // namespace pw::rpc
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