git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/memcached_connect.c

   1 #include "common.h"
   2 #include <poll.h>
   3 #include <sys/time.h>
   4
   5 static memcached_return set_hostinfo(memcached_server_st *server)
   6 {
   7   struct addrinfo *ai;
   8   struct addrinfo hints;
   9   int e;
  10   char str_port[NI_MAXSERV];
  11
  12   sprintf(str_port, "%u", server->port);
  13
  14   memset(&hints, 0, sizeof(hints));
  15
  16   hints.ai_family= AF_INET;
  17   if (server->type == MEMCACHED_CONNECTION_UDP)
  18   {
  19     hints.ai_protocol= IPPROTO_UDP;
  20     hints.ai_socktype= SOCK_DGRAM;
  21   }
  22   else
  23   {
  24     hints.ai_socktype= SOCK_STREAM;
  25     hints.ai_protocol= IPPROTO_TCP;
  26   }
  27
  28   e= getaddrinfo(server->hostname, str_port, &hints, &ai);
  29   if (e != 0)
  30   {
  31     WATCHPOINT_STRING(server->hostname);
  32     WATCHPOINT_STRING(gai_strerror(e));
  33     return MEMCACHED_HOST_LOOKUP_FAILURE;
  34   }
  35
  36   if (server->address_info)
  37     freeaddrinfo(server->address_info);
  38   server->address_info= ai;
  39
  40   return MEMCACHED_SUCCESS;
  41 }
  42
  43 static memcached_return set_socket_options(memcached_server_st *ptr)
  44 {
  45   if (ptr->type == MEMCACHED_CONNECTION_UDP)
  46     return MEMCACHED_SUCCESS;
  47
  48   if (ptr->root->snd_timeout)
  49   {
  50     int error;
  51     struct timeval waittime;
  52
  53     waittime.tv_sec= 0;
  54     waittime.tv_usec= ptr->root->snd_timeout;
  55
  56     error= setsockopt(ptr->fd, SOL_SOCKET, SO_SNDTIMEO,
  57                       &waittime, (socklen_t)sizeof(struct timeval));
  58     WATCHPOINT_ASSERT(error == 0);
  59   }
  60
  61   if (ptr->root->rcv_timeout)
  62   {
  63     int error;
  64     struct timeval waittime;
  65
  66     waittime.tv_sec= 0;
  67     waittime.tv_usec= ptr->root->rcv_timeout;
  68
  69     error= setsockopt(ptr->fd, SOL_SOCKET, SO_RCVTIMEO,
  70                       &waittime, (socklen_t)sizeof(struct timeval));
  71     WATCHPOINT_ASSERT(error == 0);
  72   }
  73
  74   {
  75     int error;
  76     struct linger linger;
  77
  78     linger.l_onoff= 1;
  79     linger.l_linger= MEMCACHED_DEFAULT_TIMEOUT;
  80     error= setsockopt(ptr->fd, SOL_SOCKET, SO_LINGER,
  81                       &linger, (socklen_t)sizeof(struct linger));
  82     WATCHPOINT_ASSERT(error == 0);
  83   }
  84
  85   if (ptr->root->flags & MEM_TCP_NODELAY)
  86   {
  87     int flag= 1;
  88     int error;
  89
  90     error= setsockopt(ptr->fd, IPPROTO_TCP, TCP_NODELAY,
  91                       &flag, (socklen_t)sizeof(int));
  92     WATCHPOINT_ASSERT(error == 0);
  93   }
  94
  95   if (ptr->root->send_size)
  96   {
  97     int error;
  98
  99     error= setsockopt(ptr->fd, SOL_SOCKET, SO_SNDBUF,
 100                       &ptr->root->send_size, (socklen_t)sizeof(int));
 101     WATCHPOINT_ASSERT(error == 0);
 102   }
 103
 104   if (ptr->root->recv_size)
 105   {
 106     int error;
 107
 108     error= setsockopt(ptr->fd, SOL_SOCKET, SO_SNDBUF,
 109                       &ptr->root->recv_size, (socklen_t)sizeof(int));
 110     WATCHPOINT_ASSERT(error == 0);
 111   }
 112
 113   /* For the moment, not getting a nonblocking mode will not be fatal */
 114   if (ptr->root->flags & MEM_NO_BLOCK)
 115   {
 116     int flags;
 117
 118     flags= fcntl(ptr->fd, F_GETFL, 0);
 119     unlikely (flags != -1)
 120     {
 121       (void)fcntl(ptr->fd, F_SETFL, flags | O_NONBLOCK);
 122     }
 123   }
 124
 125   return MEMCACHED_SUCCESS;
 126 }
 127
 128 static memcached_return unix_socket_connect(memcached_server_st *ptr)
 129 {
 130   struct sockaddr_un servAddr;
 131   socklen_t addrlen;
 132
 133   if (ptr->fd == -1)
 134   {
 135     if ((ptr->fd= socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
 136     {
 137       ptr->cached_errno= errno;
 138       return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
 139     }
 140
 141     memset(&servAddr, 0, sizeof (struct sockaddr_un));
 142     servAddr.sun_family= AF_UNIX;
 143     strcpy(servAddr.sun_path, ptr->hostname); /* Copy filename */
 144
 145     addrlen= strlen(servAddr.sun_path) + sizeof(servAddr.sun_family);
 146
 147 test_connect:
 148     if (connect(ptr->fd,
 149                 (struct sockaddr *)&servAddr,
 150                 sizeof(servAddr)) < 0)
 151     {
 152       switch (errno) {
 153       case EINPROGRESS:
 154       case EALREADY:
 155       case EINTR:
 156         goto test_connect;
 157       case EISCONN: /* We were spinning waiting on connect */
 158         break;
 159       default:
 160         WATCHPOINT_ERRNO(errno);
 161         ptr->cached_errno= errno;
 162         return MEMCACHED_ERRNO;
 163       }
 164     }
 165   }
 166   return MEMCACHED_SUCCESS;
 167 }
 168
 169 static memcached_return network_connect(memcached_server_st *ptr)
 170 {
 171   if (ptr->fd == -1)
 172   {
 173     struct addrinfo *use;
 174
 175     if(ptr->root->server_failure_limit != 0) {
 176       if(ptr->server_failure_counter >= ptr->root->server_failure_limit) {
 177           server_remove(ptr);
 178       }
 179     }
 180     /* Old connection junk still is in the structure */
 181     WATCHPOINT_ASSERT(ptr->cursor_active == 0);
 182
 183     if (ptr->sockaddr_inited == MEMCACHED_NOT_ALLOCATED ||
 184         (!(ptr->root->flags & MEM_USE_CACHE_LOOKUPS)))
 185     {
 186       memcached_return rc;
 187
 188       rc= set_hostinfo(ptr);
 189       if (rc != MEMCACHED_SUCCESS)
 190         return rc;
 191       ptr->sockaddr_inited= MEMCACHED_ALLOCATED;
 192     }
 193
 194     use= ptr->address_info;
 195     /* Create the socket */
 196     while (use != NULL)
 197     {
 198       if ((ptr->fd= socket(use->ai_family,
 199                            use->ai_socktype,
 200                            use->ai_protocol)) < 0)
 201       {
 202         ptr->cached_errno= errno;
 203         WATCHPOINT_ERRNO(errno);
 204         return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
 205       }
 206
 207       (void)set_socket_options(ptr);
 208
 209       /* connect to server */
 210 test_connect:
 211       if (connect(ptr->fd,
 212                   use->ai_addr,
 213                   use->ai_addrlen) < 0)
 214       {
 215         switch (errno) {
 216           /* We are spinning waiting on connect */
 217         case EALREADY:
 218         case EINPROGRESS:
 219           {
 220             struct pollfd fds[1];
 221             int error;
 222
 223             memset(&fds, 0, sizeof(struct pollfd));
 224             fds[0].fd= ptr->fd;
 225             fds[0].events= POLLOUT |  POLLERR;
 226             error= poll(fds, 1, ptr->root->connect_timeout);
 227
 228             if (error == 0)
 229             {
 230               goto handle_retry;
 231             }
 232             else if (error != 1 || fds[0].revents & POLLERR)
 233             {
 234               ptr->cached_errno= errno;
 235               WATCHPOINT_ERRNO(ptr->cached_errno);
 236               WATCHPOINT_NUMBER(ptr->root->connect_timeout);
 237               close(ptr->fd);
 238               ptr->fd= -1;
 239               if (ptr->address_info)
 240               {
 241                 freeaddrinfo(ptr->address_info);
 242                 ptr->address_info= NULL;
 243               }
 244
 245           if (ptr->root->retry_timeout)
 246           {
 247             struct timeval next_time;
 248
 249             gettimeofday(&next_time, NULL);
 250             ptr->next_retry= next_time.tv_sec + ptr->root->retry_timeout;
 251           }
 252               ptr->server_failure_counter+= 1;
 253               return MEMCACHED_ERRNO;
 254             }
 255
 256             break;
 257           }
 258         /* We are spinning waiting on connect */
 259         case EINTR:
 260           goto test_connect;
 261         case EISCONN: /* We were spinning waiting on connect */
 262           break;
 263         default:
 264 handle_retry:
 265           ptr->cached_errno= errno;
 266           close(ptr->fd);
 267           ptr->fd= -1;
 268           if (ptr->root->retry_timeout)
 269           {
 270             struct timeval next_time;
 271
 272             gettimeofday(&next_time, NULL);
 273             ptr->next_retry= next_time.tv_sec + ptr->root->retry_timeout;
 274           }
 275         }
 276       }
 277       else
 278       {
 279         WATCHPOINT_ASSERT(ptr->cursor_active == 0);
 280         ptr->server_failure_counter= 0;
 281         return MEMCACHED_SUCCESS;
 282       }
 283       use = use->ai_next;
 284     }
 285   }
 286
 287   if (ptr->fd == -1) {
 288     ptr->server_failure_counter+= 1;
 289     return MEMCACHED_ERRNO; /* The last error should be from connect() */
 290   }
 291
 292   ptr->server_failure_counter= 0;
 293   return MEMCACHED_SUCCESS; /* The last error should be from connect() */
 294 }
 295
 296
 297 memcached_return memcached_connect(memcached_server_st *ptr)
 298 {
 299   memcached_return rc= MEMCACHED_NO_SERVERS;
 300   LIBMEMCACHED_MEMCACHED_CONNECT_START();
 301
 302   if (ptr->root->retry_timeout)
 303   {
 304     struct timeval next_time;
 305
 306     gettimeofday(&next_time, NULL);
 307     if (next_time.tv_sec < ptr->next_retry)
 308       return MEMCACHED_TIMEOUT;
 309   }
 310   /* We need to clean up the multi startup piece */
 311   switch (ptr->type)
 312   {
 313   case MEMCACHED_CONNECTION_UNKNOWN:
 314     WATCHPOINT_ASSERT(0);
 315     rc= MEMCACHED_NOT_SUPPORTED;
 316     break;
 317   case MEMCACHED_CONNECTION_UDP:
 318   case MEMCACHED_CONNECTION_TCP:
 319     rc= network_connect(ptr);
 320     break;
 321   case MEMCACHED_CONNECTION_UNIX_SOCKET:
 322     rc= unix_socket_connect(ptr);
 323     break;
 324   default:
 325     WATCHPOINT_ASSERT(0);
 326   }
 327
 328   LIBMEMCACHED_MEMCACHED_CONNECT_END();
 329
 330   return rc;
 331 }