server.h

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/*
 *
 * Copyright 2015 gRPC 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
 *
 *     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.
 *
 */

#ifndef GRPCPP_SERVER_H
#define GRPCPP_SERVER_H

#include <condition_variable>
#include <list>
#include <memory>
#include <mutex>
#include <vector>

#include <grpc/compression.h>
#include <grpcpp/completion_queue.h>
#include <grpcpp/impl/call.h>
#include <grpcpp/impl/codegen/grpc_library.h>
#include <grpcpp/impl/codegen/server_interface.h>
#include <grpcpp/impl/rpc_service_method.h>
#include <grpcpp/security/server_credentials.h>
#include <grpcpp/support/channel_arguments.h>
#include <grpcpp/support/config.h>
#include <grpcpp/support/status.h>

struct grpc_server;

namespace grpc {

class AsyncGenericService;
class HealthCheckServiceInterface;
class ServerContext;
class ServerInitializer;

class Server : public ServerInterface, private GrpcLibraryCodegen {
 public:
  ~Server();

  void Wait() override;

  class GlobalCallbacks {
   public:
    virtual ~GlobalCallbacks() {}
    virtual void UpdateArguments(ChannelArguments* args) {}
    virtual void PreSynchronousRequest(ServerContext* context) = 0;
    virtual void PostSynchronousRequest(ServerContext* context) = 0;
    virtual void PreServerStart(Server* server) {}
    virtual void AddPort(Server* server, const grpc::string& addr,
                         ServerCredentials* creds, int port) {}
  };
  static void SetGlobalCallbacks(GlobalCallbacks* callbacks);

  grpc_server* c_server();

  HealthCheckServiceInterface* GetHealthCheckService() const {
    return health_check_service_.get();
  }

  std::shared_ptr<Channel> InProcessChannel(const ChannelArguments& args);

 protected:
  bool RegisterService(const grpc::string* host, Service* service) override;

  int AddListeningPort(const grpc::string& addr,
                       ServerCredentials* creds) override;

  Server(int max_message_size, ChannelArguments* args,
         std::shared_ptr<std::vector<std::unique_ptr<ServerCompletionQueue>>>
             sync_server_cqs,
         int min_pollers, int max_pollers, int sync_cq_timeout_msec,
         grpc_resource_quota* server_rq = nullptr);

  void Start(ServerCompletionQueue** cqs, size_t num_cqs) override;

  grpc_server* server() override { return server_; };

 private:
  friend class AsyncGenericService;
  friend class ServerBuilder;
  friend class ServerInitializer;

  class SyncRequest;
  class UnimplementedAsyncRequest;
  class UnimplementedAsyncResponse;

  class SyncRequestThreadManager;

  void RegisterAsyncGenericService(AsyncGenericService* service) override;

  void PerformOpsOnCall(internal::CallOpSetInterface* ops,
                        internal::Call* call) override;

  void ShutdownInternal(gpr_timespec deadline) override;

  int max_receive_message_size() const override {
    return max_receive_message_size_;
  };

  ServerInitializer* initializer();

  const int max_receive_message_size_;

  std::shared_ptr<std::vector<std::unique_ptr<ServerCompletionQueue>>>
      sync_server_cqs_;

  std::vector<std::unique_ptr<SyncRequestThreadManager>> sync_req_mgrs_;

  // Server status
  std::mutex mu_;
  bool started_;
  bool shutdown_;
  bool shutdown_notified_;  // Was notify called on the shutdown_cv_

  std::condition_variable shutdown_cv_;

  std::shared_ptr<GlobalCallbacks> global_callbacks_;

  std::vector<grpc::string> services_;
  bool has_generic_service_;

  // Pointer to the wrapped grpc_server.
  grpc_server* server_;

  std::unique_ptr<ServerInitializer> server_initializer_;

  std::unique_ptr<HealthCheckServiceInterface> health_check_service_;
  bool health_check_service_disabled_;

  // A special handler for resource exhausted in sync case
  std::unique_ptr<internal::MethodHandler> resource_exhausted_handler_;
};

}  // namespace grpc

#endif  // GRPCPP_SERVER_H