mirror of https://github.com/grpc/grpc.git
Merge pull request #23917 from karthikravis/server
Move Server from ::grpc_impl to ::grpcpull/23996/head
Karthik Ravi Shankar
4 years ago
committed by
GitHub
commit
694bb50648
17 changed files with 371 additions and 428 deletions
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/*
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* |
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* Copyright 2015 gRPC authors. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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*/ |
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#ifndef GRPCPP_SERVER_IMPL_H |
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#define GRPCPP_SERVER_IMPL_H |
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#include <list> |
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#include <memory> |
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#include <vector> |
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#include <grpc/impl/codegen/port_platform.h> |
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#include <grpc/compression.h> |
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#include <grpc/support/atm.h> |
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#include <grpcpp/channel.h> |
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#include <grpcpp/completion_queue.h> |
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#include <grpcpp/health_check_service_interface.h> |
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#include <grpcpp/impl/call.h> |
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#include <grpcpp/impl/codegen/client_interceptor.h> |
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#include <grpcpp/impl/codegen/completion_queue.h> |
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#include <grpcpp/impl/codegen/grpc_library.h> |
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#include <grpcpp/impl/codegen/server_interface.h> |
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#include <grpcpp/impl/rpc_service_method.h> |
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#include <grpcpp/security/server_credentials.h> |
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#include <grpcpp/support/channel_arguments.h> |
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#include <grpcpp/support/config.h> |
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#include <grpcpp/support/status.h> |
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struct grpc_server; |
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namespace grpc { |
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class AsyncGenericService; |
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namespace internal { |
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class ExternalConnectionAcceptorImpl; |
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} // namespace internal
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} // namespace grpc
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namespace grpc_impl { |
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class ServerContext; |
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class ServerInitializer; |
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/// Represents a gRPC server.
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///
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/// Use a \a grpc::ServerBuilder to create, configure, and start
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/// \a Server instances.
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class Server : public grpc::ServerInterface, private grpc::GrpcLibraryCodegen { |
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public: |
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~Server(); |
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/// Block until the server shuts down.
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///
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/// \warning The server must be either shutting down or some other thread must
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/// call \a Shutdown for this function to ever return.
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void Wait() override; |
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/// Global callbacks are a set of hooks that are called when server
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/// events occur. \a SetGlobalCallbacks method is used to register
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/// the hooks with gRPC. Note that
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/// the \a GlobalCallbacks instance will be shared among all
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/// \a Server instances in an application and can be set exactly
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/// once per application.
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class GlobalCallbacks { |
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public: |
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virtual ~GlobalCallbacks() {} |
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/// Called before server is created.
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virtual void UpdateArguments(grpc::ChannelArguments* /*args*/) {} |
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/// Called before application callback for each synchronous server request
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virtual void PreSynchronousRequest(grpc_impl::ServerContext* context) = 0; |
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/// Called after application callback for each synchronous server request
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virtual void PostSynchronousRequest(grpc_impl::ServerContext* context) = 0; |
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/// Called before server is started.
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virtual void PreServerStart(Server* /*server*/) {} |
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/// Called after a server port is added.
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virtual void AddPort(Server* /*server*/, const std::string& /*addr*/, |
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grpc::ServerCredentials* /*creds*/, int /*port*/) {} |
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}; |
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/// Set the global callback object. Can only be called once per application.
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/// Does not take ownership of callbacks, and expects the pointed to object
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/// to be alive until all server objects in the process have been destroyed.
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/// The same \a GlobalCallbacks object will be used throughout the
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/// application and is shared among all \a Server objects.
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static void SetGlobalCallbacks(GlobalCallbacks* callbacks); |
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/// Returns a \em raw pointer to the underlying \a grpc_server instance.
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/// EXPERIMENTAL: for internal/test use only
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grpc_server* c_server(); |
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/// Returns the health check service.
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grpc::HealthCheckServiceInterface* GetHealthCheckService() const { |
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return health_check_service_.get(); |
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} |
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/// Establish a channel for in-process communication
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std::shared_ptr<grpc::Channel> InProcessChannel( |
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const grpc::ChannelArguments& args); |
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/// NOTE: class experimental_type is not part of the public API of this class.
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/// TODO(yashykt): Integrate into public API when this is no longer
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/// experimental.
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class experimental_type { |
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public: |
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explicit experimental_type(Server* server) : server_(server) {} |
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/// Establish a channel for in-process communication with client
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/// interceptors
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std::shared_ptr<grpc::Channel> InProcessChannelWithInterceptors( |
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const grpc::ChannelArguments& args, |
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std::vector<std::unique_ptr< |
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grpc::experimental::ClientInterceptorFactoryInterface>> |
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interceptor_creators); |
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private: |
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Server* server_; |
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}; |
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/// NOTE: The function experimental() is not stable public API. It is a view
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/// to the experimental components of this class. It may be changed or removed
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/// at any time.
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experimental_type experimental() { return experimental_type(this); } |
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protected: |
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/// Register a service. This call does not take ownership of the service.
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/// The service must exist for the lifetime of the Server instance.
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bool RegisterService(const std::string* host, |
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grpc::Service* service) override; |
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/// Try binding the server to the given \a addr endpoint
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/// (port, and optionally including IP address to bind to).
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///
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/// It can be invoked multiple times. Should be used before
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/// starting the server.
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///
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/// \param addr The address to try to bind to the server (eg, localhost:1234,
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/// 192.168.1.1:31416, [::1]:27182, etc.).
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/// \param creds The credentials associated with the server.
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///
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/// \return bound port number on success, 0 on failure.
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///
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/// \warning It is an error to call this method on an already started server.
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int AddListeningPort(const std::string& addr, |
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grpc::ServerCredentials* creds) override; |
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/// NOTE: This is *NOT* a public API. The server constructors are supposed to
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/// be used by \a ServerBuilder class only. The constructor will be made
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/// 'private' very soon.
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///
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/// Server constructors. To be used by \a ServerBuilder only.
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///
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/// \param args The channel args
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///
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/// \param sync_server_cqs The completion queues to use if the server is a
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/// synchronous server (or a hybrid server). The server polls for new RPCs on
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/// these queues
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///
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/// \param min_pollers The minimum number of polling threads per server
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/// completion queue (in param sync_server_cqs) to use for listening to
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/// incoming requests (used only in case of sync server)
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///
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/// \param max_pollers The maximum number of polling threads per server
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/// completion queue (in param sync_server_cqs) to use for listening to
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/// incoming requests (used only in case of sync server)
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///
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/// \param sync_cq_timeout_msec The timeout to use when calling AsyncNext() on
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/// server completion queues passed via sync_server_cqs param.
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Server( |
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grpc::ChannelArguments* args, |
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std::shared_ptr<std::vector<std::unique_ptr<grpc::ServerCompletionQueue>>> |
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sync_server_cqs, |
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int min_pollers, int max_pollers, int sync_cq_timeout_msec, |
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std::vector< |
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std::shared_ptr<grpc::internal::ExternalConnectionAcceptorImpl>> |
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acceptors, |
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grpc_resource_quota* server_rq = nullptr, |
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std::vector<std::unique_ptr< |
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grpc::experimental::ServerInterceptorFactoryInterface>> |
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interceptor_creators = std::vector<std::unique_ptr< |
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grpc::experimental::ServerInterceptorFactoryInterface>>()); |
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/// Start the server.
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///
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/// \param cqs Completion queues for handling asynchronous services. The
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/// caller is required to keep all completion queues live until the server is
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/// destroyed.
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/// \param num_cqs How many completion queues does \a cqs hold.
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void Start(grpc::ServerCompletionQueue** cqs, size_t num_cqs) override; |
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grpc_server* server() override { return server_; } |
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protected: |
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/// NOTE: This method is not part of the public API for this class.
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void set_health_check_service( |
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std::unique_ptr<grpc::HealthCheckServiceInterface> service) { |
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health_check_service_ = std::move(service); |
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} |
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/// NOTE: This method is not part of the public API for this class.
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bool health_check_service_disabled() const { |
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return health_check_service_disabled_; |
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} |
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private: |
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std::vector< |
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std::unique_ptr<grpc::experimental::ServerInterceptorFactoryInterface>>* |
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interceptor_creators() override { |
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return &interceptor_creators_; |
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} |
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friend class grpc::AsyncGenericService; |
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friend class grpc::ServerBuilder; |
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friend class grpc_impl::ServerInitializer; |
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class SyncRequest; |
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class CallbackRequestBase; |
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template <class ServerContextType> |
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class CallbackRequest; |
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class UnimplementedAsyncRequest; |
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class UnimplementedAsyncResponse; |
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/// SyncRequestThreadManager is an implementation of ThreadManager. This class
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/// is responsible for polling for incoming RPCs and calling the RPC handlers.
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/// This is only used in case of a Sync server (i.e a server exposing a sync
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/// interface)
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class SyncRequestThreadManager; |
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/// Register a generic service. This call does not take ownership of the
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/// service. The service must exist for the lifetime of the Server instance.
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void RegisterAsyncGenericService(grpc::AsyncGenericService* service) override; |
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#ifdef GRPC_CALLBACK_API_NONEXPERIMENTAL |
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/// Register a callback-based generic service. This call does not take
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/// ownership of theservice. The service must exist for the lifetime of the
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/// Server instance.
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void RegisterCallbackGenericService( |
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grpc::CallbackGenericService* service) override; |
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#else |
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/// NOTE: class experimental_registration_type is not part of the public API
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/// of this class
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/// TODO(vjpai): Move these contents to the public API of Server when
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/// they are no longer experimental
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class experimental_registration_type final |
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: public experimental_registration_interface { |
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public: |
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explicit experimental_registration_type(Server* server) : server_(server) {} |
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void RegisterCallbackGenericService( |
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grpc::experimental::CallbackGenericService* service) override { |
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server_->RegisterCallbackGenericService(service); |
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} |
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private: |
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Server* server_; |
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}; |
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/// TODO(vjpai): Mark this override when experimental type above is deleted
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void RegisterCallbackGenericService( |
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grpc::experimental::CallbackGenericService* service); |
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/// NOTE: The function experimental_registration() is not stable public API.
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/// It is a view to the experimental components of this class. It may be
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/// changed or removed at any time.
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experimental_registration_interface* experimental_registration() override { |
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return &experimental_registration_; |
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} |
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#endif |
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void PerformOpsOnCall(grpc::internal::CallOpSetInterface* ops, |
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grpc::internal::Call* call) override; |
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void ShutdownInternal(gpr_timespec deadline) override; |
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int max_receive_message_size() const override { |
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return max_receive_message_size_; |
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} |
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grpc::CompletionQueue* CallbackCQ() override; |
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grpc_impl::ServerInitializer* initializer(); |
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// Functions to manage the server shutdown ref count. Things that increase
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// the ref count are the running state of the server (take a ref at start and
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// drop it at shutdown) and each running callback RPC.
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void Ref(); |
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void UnrefWithPossibleNotify() /* LOCKS_EXCLUDED(mu_) */; |
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void UnrefAndWaitLocked() /* EXCLUSIVE_LOCKS_REQUIRED(mu_) */; |
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std::vector<std::shared_ptr<grpc::internal::ExternalConnectionAcceptorImpl>> |
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acceptors_; |
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// A vector of interceptor factory objects.
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// This should be destroyed after health_check_service_ and this requirement
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// is satisfied by declaring interceptor_creators_ before
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// health_check_service_. (C++ mandates that member objects be destroyed in
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// the reverse order of initialization.)
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std::vector< |
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std::unique_ptr<grpc::experimental::ServerInterceptorFactoryInterface>> |
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interceptor_creators_; |
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int max_receive_message_size_; |
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/// The following completion queues are ONLY used in case of Sync API
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/// i.e. if the server has any services with sync methods. The server uses
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/// these completion queues to poll for new RPCs
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std::shared_ptr<std::vector<std::unique_ptr<grpc::ServerCompletionQueue>>> |
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sync_server_cqs_; |
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/// List of \a ThreadManager instances (one for each cq in
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/// the \a sync_server_cqs)
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std::vector<std::unique_ptr<SyncRequestThreadManager>> sync_req_mgrs_; |
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#ifndef GRPC_CALLBACK_API_NONEXPERIMENTAL |
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// For registering experimental callback generic service; remove when that
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// method longer experimental
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experimental_registration_type experimental_registration_{this}; |
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#endif |
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// Server status
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grpc::internal::Mutex mu_; |
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bool started_; |
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bool shutdown_; |
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bool shutdown_notified_; // Was notify called on the shutdown_cv_
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grpc::internal::CondVar shutdown_done_cv_; |
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bool shutdown_done_ = false; |
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std::atomic_int shutdown_refs_outstanding_{1}; |
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grpc::internal::CondVar shutdown_cv_; |
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std::shared_ptr<GlobalCallbacks> global_callbacks_; |
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std::vector<std::string> services_; |
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bool has_async_generic_service_ = false; |
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bool has_callback_generic_service_ = false; |
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bool has_callback_methods_ = false; |
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// Pointer to the wrapped grpc_server.
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grpc_server* server_; |
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std::unique_ptr<grpc_impl::ServerInitializer> server_initializer_; |
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std::unique_ptr<grpc::HealthCheckServiceInterface> health_check_service_; |
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bool health_check_service_disabled_; |
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// When appropriate, use a default callback generic service to handle
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// unimplemented methods
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#ifdef GRPC_CALLBACK_API_NONEXPERIMENTAL |
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std::unique_ptr<grpc::CallbackGenericService> unimplemented_service_; |
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#else |
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std::unique_ptr<grpc::experimental::CallbackGenericService> |
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unimplemented_service_; |
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#endif |
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// A special handler for resource exhausted in sync case
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std::unique_ptr<grpc::internal::MethodHandler> resource_exhausted_handler_; |
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// Handler for callback generic service, if any
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std::unique_ptr<grpc::internal::MethodHandler> generic_handler_; |
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// callback_cq_ references the callbackable completion queue associated
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// with this server (if any). It is set on the first call to CallbackCQ().
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// It is _not owned_ by the server; ownership belongs with its internal
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// shutdown callback tag (invoked when the CQ is fully shutdown).
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grpc::CompletionQueue* callback_cq_ /* GUARDED_BY(mu_) */ = nullptr; |
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// List of CQs passed in by user that must be Shutdown only after Server is
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// Shutdown. Even though this is only used with NDEBUG, instantiate it in all
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// cases since otherwise the size will be inconsistent.
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std::vector<grpc::CompletionQueue*> cq_list_; |
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}; |
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} // namespace grpc_impl
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#endif // GRPCPP_SERVER_IMPL_H
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