3 * Copyright 2015 gRPC authors.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
19 #ifndef GRPC_CORE_LIB_IOMGR_UDP_SERVER_H
20 #define GRPC_CORE_LIB_IOMGR_UDP_SERVER_H
22 #include <grpc/support/port_platform.h>
24 #include "src/core/lib/gprpp/abstract.h"
25 #include "src/core/lib/iomgr/endpoint.h"
26 #include "src/core/lib/iomgr/ev_posix.h"
27 #include "src/core/lib/iomgr/resolve_address.h"
29 /* Forward decl of struct grpc_server */
30 /* This is not typedef'ed to avoid a typedef-redefinition error */
33 /* Forward decl of grpc_udp_server */
34 typedef struct grpc_udp_server grpc_udp_server;
36 /* An interface associated with a socket. udp server delivers I/O event on that
37 * socket to the subclass of this interface which is created through
38 * GrpcUdpHandlerFactory.
39 * Its implementation should do the real IO work, e.g. read packet and write. */
40 class GrpcUdpHandler {
42 GrpcUdpHandler(grpc_fd* emfd, void* user_data) {}
43 virtual ~GrpcUdpHandler() {}
45 // Interfaces to be implemented by subclasses to do the actual setup/tear down
48 // Called when data is available to read from the socket. Returns true if
49 // there is more data to read after this call.
50 virtual bool Read() GRPC_ABSTRACT;
51 // Called when socket becomes write unblocked. The given closure should be
52 // scheduled when the socket becomes blocked next time.
53 virtual void OnCanWrite(void* user_data,
54 grpc_closure* notify_on_write_closure) GRPC_ABSTRACT;
55 // Called before the gRPC FD is orphaned. Notify udp server to continue
56 // orphaning fd by scheduling the given closure, afterwards the associated fd
58 virtual void OnFdAboutToOrphan(grpc_closure* orphan_fd_closure,
59 void* user_data) GRPC_ABSTRACT;
61 GRPC_ABSTRACT_BASE_CLASS
64 class GrpcUdpHandlerFactory {
66 virtual ~GrpcUdpHandlerFactory() {}
67 /* Called when start to listen on a socket.
68 * Return an instance of the implementation of GrpcUdpHandler interface which
69 * will process I/O events for this socket from now on. */
70 virtual GrpcUdpHandler* CreateUdpHandler(grpc_fd* emfd,
71 void* user_data) GRPC_ABSTRACT;
72 virtual void DestroyUdpHandler(GrpcUdpHandler* handler) GRPC_ABSTRACT;
74 GRPC_ABSTRACT_BASE_CLASS
77 /* Create a server, initially not bound to any ports */
78 grpc_udp_server* grpc_udp_server_create(const grpc_channel_args* args);
80 /* Start listening to bound ports. user_data is passed to callbacks. */
81 void grpc_udp_server_start(grpc_udp_server* udp_server, grpc_pollset** pollsets,
82 size_t pollset_count, void* user_data);
84 int grpc_udp_server_get_fd(grpc_udp_server* s, unsigned port_index);
86 /* Add a port to the server, returning port number on success, or negative
89 Create |num_listeners| sockets for given address to listen on using
90 SO_REUSEPORT if supported.
92 The :: and 0.0.0.0 wildcard addresses are treated identically, accepting
93 both IPv4 and IPv6 connections, but :: is the preferred style. This usually
94 creates |num_listeners| sockets, but possibly 2 * |num_listeners| on systems
95 which support IPv6, but not dualstack sockets. */
97 /* TODO(ctiller): deprecate this, and make grpc_udp_server_add_ports to handle
98 all of the multiple socket port matching logic in one place */
99 int grpc_udp_server_add_port(grpc_udp_server* s,
100 const grpc_resolved_address* addr,
101 int rcv_buf_size, int snd_buf_size,
102 GrpcUdpHandlerFactory* handler_factory,
103 size_t num_listeners);
105 void grpc_udp_server_destroy(grpc_udp_server* server, grpc_closure* on_done);
107 #endif /* GRPC_CORE_LIB_IOMGR_UDP_SERVER_H */