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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPCXX_SERVER_H
#define GRPCXX_SERVER_H
#include <condition_variable>
#include <list>
#include <memory>
#include <mutex>
#include <vector>
#include <grpc++/completion_queue.h>
#include <grpc++/impl/call.h>
#include <grpc++/impl/codegen/grpc_library.h>
#include <grpc++/impl/codegen/server_interface.h>
#include <grpc++/impl/rpc_service_method.h>
#include <grpc++/security/server_credentials.h>
#include <grpc++/support/channel_arguments.h>
#include <grpc++/support/config.h>
#include <grpc++/support/status.h>
#include <grpc/compression.h>
struct grpc_server;
namespace grpc {
class GenericServerContext;
class AsyncGenericService;
class ServerAsyncStreamingInterface;
class ServerContext;
class ServerInitializer;
class ThreadPoolInterface;
/// Models a gRPC server.
///
/// Servers are configured and started via \a grpc::ServerBuilder.
class Server final : public ServerInterface, private GrpcLibraryCodegen {
public:
~Server();
/// Block waiting for all work to complete.
///
/// \warning The server must be either shutting down or some other thread must
/// call \a Shutdown for this function to ever return.
void Wait() override;
/// Global Callbacks
///
/// Can be set exactly once per application to install hooks whenever
/// a server event occurs
class GlobalCallbacks {
public:
virtual ~GlobalCallbacks() {}
/// Called before server is created.
virtual void UpdateArguments(ChannelArguments* args) {}
/// Called before application callback for each synchronous server request
virtual void PreSynchronousRequest(ServerContext* context) = 0;
/// Called after application callback for each synchronous server request
virtual void PostSynchronousRequest(ServerContext* context) = 0;
};
/// Set the global callback object. Can only be called once. Does not take
/// ownership of callbacks, and expects the pointed to object to be alive
/// until all server objects in the process have been destroyed.
static void SetGlobalCallbacks(GlobalCallbacks* callbacks);
// Returns a \em raw pointer to the underlying grpc_server instance.
grpc_server* c_server();
private:
friend class AsyncGenericService;
friend class ServerBuilder;
friend class ServerInitializer;
class SyncRequest;
class AsyncRequest;
class ShutdownRequest;
/// SyncRequestThreadManager is an implementation of ThreadManager. This class
/// is responsible for polling for incoming RPCs and calling the RPC handlers.
/// This is only used in case of a Sync server (i.e a server exposing a sync
/// interface)
class SyncRequestThreadManager;
class UnimplementedAsyncRequestContext;
class UnimplementedAsyncRequest;
class UnimplementedAsyncResponse;
/// Server constructors. To be used by \a ServerBuilder only.
///
/// \param max_message_size Maximum message length that the channel can
/// receive.
///
/// \param args The channel args
///
/// \param sync_server_cqs The completion queues to use if the server is a
/// synchronous server (or a hybrid server). The server polls for new RPCs on
/// these queues
///
/// \param min_pollers The minimum number of polling threads per server
/// completion queue (in param sync_server_cqs) to use for listening to
/// incoming requests (used only in case of sync server)
///
/// \param max_pollers The maximum number of polling threads per server
/// completion queue (in param sync_server_cqs) to use for listening to
/// incoming requests (used only in case of sync server)
///
/// \param sync_cq_timeout_msec The timeout to use when calling AsyncNext() on
/// server completion queues passed via sync_server_cqs param.
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);
/// Register a service. This call does not take ownership of the service.
/// The service must exist for the lifetime of the Server instance.
bool RegisterService(const grpc::string* host, Service* service) override;
/// Register a generic service. This call does not take ownership of the
/// service. The service must exist for the lifetime of the Server instance.
void RegisterAsyncGenericService(AsyncGenericService* service) override;
/// Tries to bind \a server to the given \a addr.
///
/// It can be invoked multiple times.
///
/// \param addr The address to try to bind to the server (eg, localhost:1234,
/// 192.168.1.1:31416, [::1]:27182, etc.).
/// \params creds The credentials associated with the server.
///
/// \return bound port number on sucess, 0 on failure.
///
/// \warning It's an error to call this method on an already started server.
int AddListeningPort(const grpc::string& addr,
ServerCredentials* creds) override;
/// Start the server.
///
/// \param cqs Completion queues for handling asynchronous services. The
/// caller is required to keep all completion queues live until the server is
/// destroyed.
/// \param num_cqs How many completion queues does \a cqs hold.
///
/// \return true on a successful shutdown.
bool Start(ServerCompletionQueue** cqs, size_t num_cqs) override;
void PerformOpsOnCall(CallOpSetInterface* ops, Call* call) override;
void ShutdownInternal(gpr_timespec deadline) override;
int max_receive_message_size() const override {
return max_receive_message_size_;
};
grpc_server* server() override { return server_; };
ServerInitializer* initializer();
const int max_receive_message_size_;
/// The following completion queues are ONLY used in case of Sync API i.e if
/// the server has any services with sync methods. The server uses these
/// completion queues to poll for new RPCs
std::shared_ptr<std::vector<std::unique_ptr<ServerCompletionQueue>>>
sync_server_cqs_;
/// List of ThreadManager instances (one for each cq in the sync_server_cqs)
std::vector<std::unique_ptr<SyncRequestThreadManager>> sync_req_mgrs_;
// Sever 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_;
};
} // namespace grpc
#endif // GRPCXX_SERVER_H
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