aboutsummaryrefslogtreecommitdiffhomepage
path: root/include/grpc++/server.h
blob: 729a5143bf8b3fd83bcdf481c192860583844cd2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/*
 *
 * 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 <list>
#include <memory>

#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++/impl/sync.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 ThreadPoolInterface;

/// Models a gRPC server.
///
/// Servers are configured and started via \a grpc::ServerBuilder.
class Server GRPC_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() GRPC_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);

 private:
  friend class AsyncGenericService;
  friend class ServerBuilder;

  class SyncRequest;
  class AsyncRequest;
  class ShutdownRequest;

  class UnimplementedAsyncRequestContext;
  class UnimplementedAsyncRequest;
  class UnimplementedAsyncResponse;

  /// Server constructors. To be used by \a ServerBuilder only.
  ///
  /// \param thread_pool The threadpool instance to use for call processing.
  /// \param thread_pool_owned Does the server own the \a thread_pool instance?
  /// \param max_message_size Maximum message length that the channel can
  /// receive.
  Server(ThreadPoolInterface* thread_pool, bool thread_pool_owned,
         int max_message_size, ChannelArguments* args);

  /// 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) GRPC_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) GRPC_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) GRPC_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) GRPC_OVERRIDE;

  /// Process one or more incoming calls.
  void RunRpc() GRPC_OVERRIDE;

  /// Schedule \a RunRpc to run in the threadpool.
  void ScheduleCallback() GRPC_OVERRIDE;

  void PerformOpsOnCall(CallOpSetInterface* ops, Call* call) GRPC_OVERRIDE;

  void ShutdownInternal(gpr_timespec deadline) GRPC_OVERRIDE;

  int max_message_size() const GRPC_OVERRIDE { return max_message_size_; };

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

  const int max_message_size_;

  // Completion queue.
  CompletionQueue cq_;

  // Sever status
  grpc::mutex mu_;
  bool started_;
  bool shutdown_;
  // The number of threads which are running callbacks.
  int num_running_cb_;
  grpc::condition_variable callback_cv_;

  std::shared_ptr<GlobalCallbacks> global_callbacks_;

  std::list<SyncRequest>* sync_methods_;
  std::unique_ptr<RpcServiceMethod> unknown_method_;
  bool has_generic_service_;

  // Pointer to the c grpc server.
  grpc_server* server_;

  ThreadPoolInterface* thread_pool_;
  // Whether the thread pool is created and owned by the server.
  bool thread_pool_owned_;
};

}  // namespace grpc

#endif  // GRPCXX_SERVER_H