tcp_server_utils_posix.h

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/*
 *
 * Copyright 2017 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 GRPC_CORE_LIB_IOMGR_TCP_SERVER_UTILS_POSIX_H
#define GRPC_CORE_LIB_IOMGR_TCP_SERVER_UTILS_POSIX_H
 
#include <grpc/support/port_platform.h>
 
#include "src/core/lib/iomgr/ev_posix.h"
#include "src/core/lib/iomgr/resolve_address.h"
#include "src/core/lib/iomgr/socket_utils_posix.h"
#include "src/core/lib/iomgr/tcp_server.h"
 
/* one listening port */
typedef struct grpc_tcp_listener {
  int fd;
  grpc_fd* emfd;
  grpc_tcp_server* server;
  grpc_resolved_address addr;
  int port;
  unsigned port_index;
  unsigned fd_index;
  grpc_closure read_closure;
  grpc_closure destroyed_closure;
  struct grpc_tcp_listener* next;
  /* sibling is a linked list of all listeners for a given port. add_port and
     clone_port place all new listeners in the same sibling list. A member of
     the 'sibling' list is also a member of the 'next' list. The head of each
     sibling list has is_sibling==0, and subsequent members of sibling lists
     have is_sibling==1. is_sibling allows separate sibling lists to be
     identified while iterating through 'next'. */
  struct grpc_tcp_listener* sibling;
  int is_sibling;
} grpc_tcp_listener;
 
/* the overall server */
struct grpc_tcp_server {
  gpr_refcount refs;
  /* Called whenever accept() succeeds on a server port. */
  grpc_tcp_server_cb on_accept_cb;
  void* on_accept_cb_arg;
 
  gpr_mu mu;
 
  /* active port count: how many ports are actually still listening */
  size_t active_ports;
  /* destroyed port count: how many ports are completely destroyed */
  size_t destroyed_ports;
 
  /* is this server shutting down? */
  bool shutdown;
  /* have listeners been shutdown? */
  bool shutdown_listeners;
  /* use SO_REUSEPORT */
  bool so_reuseport;
  /* expand wildcard addresses to a list of all local addresses */
  bool expand_wildcard_addrs;
 
  /* linked list of server ports */
  grpc_tcp_listener* head;
  grpc_tcp_listener* tail;
  unsigned nports;
 
  /* List of closures passed to shutdown_starting_add(). */
  grpc_closure_list shutdown_starting;
 
  /* shutdown callback */
  grpc_closure* shutdown_complete;
 
  /* all pollsets interested in new connections */
  grpc_pollset** pollsets;
  /* number of pollsets in the pollsets array */
  size_t pollset_count;
 
  /* next pollset to assign a channel to */
  gpr_atm next_pollset_to_assign;
 
  /* channel args for this server */
  grpc_channel_args* channel_args;
 
  /* a handler for external connections, owned */
  grpc_core::TcpServerFdHandler* fd_handler;
};
 
/* If successful, add a listener to \a s for \a addr, set \a dsmode for the
   socket, and return the \a listener. */
grpc_error* grpc_tcp_server_add_addr(grpc_tcp_server* s,
                                     const grpc_resolved_address* addr,
                                     unsigned port_index, unsigned fd_index,
                                     grpc_dualstack_mode* dsmode,
                                     grpc_tcp_listener** listener);
 
/* Get all addresses assigned to network interfaces on the machine and create a
   listener for each. requested_port is the port to use for every listener, or 0
   to select one random port that will be used for every listener. Set *out_port
   to the port selected. Return GRPC_ERROR_NONE only if all listeners were
   added. */
grpc_error* grpc_tcp_server_add_all_local_addrs(grpc_tcp_server* s,
                                                unsigned port_index,
                                                int requested_port,
                                                int* out_port);
 
/* Prepare a recently-created socket for listening. */
grpc_error* grpc_tcp_server_prepare_socket(grpc_tcp_server*, int fd,
                                           const grpc_resolved_address* addr,
                                           bool so_reuseport, int* port);
/* Ruturn true if the platform supports ifaddrs */
bool grpc_tcp_server_have_ifaddrs(void);
 
#endif /* GRPC_CORE_LIB_IOMGR_TCP_SERVER_UTILS_POSIX_H */