pw_rpc/public/pw_rpc/server_context.h

// 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 "pw_assert/assert.h"
#include "pw_rpc/channel.h"

namespace pw::rpc {
namespace internal {

class Method;
class Service;
class BaseServerWriter;

}  // namespace internal

// The ServerContext collects context for an RPC being invoked on a server.
class ServerContext {
 public:
  uint32_t channel_id() const {
    PW_DCHECK_NOTNULL(channel_);
    return channel_->id();
  }

 private:
  friend class Server;
  friend class internal::BaseServerWriter;
  template <typename, uint32_t, uint32_t>
  friend class ServerContextForTest;

  constexpr ServerContext()
      : channel_(nullptr), service_(nullptr), method_(nullptr) {}

  constexpr ServerContext(Channel& channel,
                          internal::Service& service,
                          const internal::Method& method)
      : channel_(&channel), service_(&service), method_(&method) {}

  constexpr ServerContext(const ServerContext&) = default;
  constexpr ServerContext& operator=(const ServerContext&) = default;

  Channel* channel_;
  internal::Service* service_;
  const internal::Method* method_;
};

}  // namespace pw::rpc