git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/delete.c

   1 #include "common.h"
   2 #include "memcached/protocol_binary.h"
   3
   4 memcached_return_t memcached_delete(memcached_st *ptr, const char *key, size_t key_length,
   5                                     time_t expiration)
   6 {
   7   return memcached_delete_by_key(ptr, key, key_length,
   8                                  key, key_length, expiration);
   9 }
  10
  11 static inline memcached_return_t binary_delete(memcached_st *ptr,
  12                                                uint32_t server_key,
  13                                                const char *key,
  14                                                size_t key_length,
  15                                                bool flush);
  16
  17 memcached_return_t memcached_delete_by_key(memcached_st *ptr,
  18                                            const char *master_key, size_t master_key_length,
  19                                            const char *key, size_t key_length,
  20                                            time_t expiration)
  21 {
  22   bool to_write;
  23   memcached_return_t rc;
  24   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  25   uint32_t server_key;
  26   memcached_server_write_instance_st instance;
  27
  28   LIBMEMCACHED_MEMCACHED_DELETE_START();
  29
  30   rc= memcached_validate_key_length(key_length,
  31                                     ptr->flags.binary_protocol);
  32   unlikely (rc != MEMCACHED_SUCCESS)
  33     return rc;
  34
  35   unlikely (memcached_server_count(ptr) == 0)
  36     return MEMCACHED_NO_SERVERS;
  37
  38   server_key= memcached_generate_hash_with_redistribution(ptr, master_key, master_key_length);
  39   instance= memcached_server_instance_fetch(ptr, server_key);
  40
  41   to_write= (ptr->flags.buffer_requests) ? false : true;
  42
  43   bool no_reply= (ptr->flags.no_reply);
  44
  45   if (ptr->flags.binary_protocol)
  46   {
  47     likely (! expiration)
  48     {
  49       rc= binary_delete(ptr, server_key, key, key_length, to_write);
  50     }
  51     else
  52     {
  53       rc= MEMCACHED_INVALID_ARGUMENTS;
  54     }
  55   }
  56   else
  57   {
  58     int send_length;
  59
  60     unlikely (expiration)
  61     {
  62        if ((instance->major_version == 1 &&
  63             instance->minor_version > 2) ||
  64            instance->major_version > 1)
  65        {
  66          rc= MEMCACHED_INVALID_ARGUMENTS;
  67          goto error;
  68        }
  69        else
  70        {
  71           /* ensure that we are connected, otherwise we might bump the
  72            * command counter before connection */
  73           if ((rc= memcached_connect(instance)) != MEMCACHED_SUCCESS)
  74           {
  75             WATCHPOINT_ERROR(rc);
  76             return rc;
  77           }
  78
  79           if (instance->minor_version == 0)
  80           {
  81              if (no_reply || ! to_write)
  82              {
  83                 /* We might get out of sync with the server if we
  84                  * send this command to a server newer than 1.2.x..
  85                  * disable no_reply and buffered mode.
  86                  */
  87                 to_write= true;
  88                 if (no_reply)
  89                    memcached_server_response_increment(instance);
  90                 no_reply= false;
  91              }
  92           }
  93           send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  94                                 "delete %.*s%.*s %u%s\r\n",
  95                                 (int)ptr->prefix_key_length,
  96                                 ptr->prefix_key,
  97                                 (int) key_length, key,
  98                                 (uint32_t)expiration,
  99                                 no_reply ? " noreply" :"" );
 100        }
 101     }
 102     else
 103     {
 104       send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
 105                             "delete %.*s%.*s%s\r\n",
 106                             (int)ptr->prefix_key_length,
 107                             ptr->prefix_key,
 108                             (int)key_length, key, no_reply ? " noreply" :"");
 109     }
 110
 111     if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE || send_length < 0)
 112     {
 113       rc= MEMCACHED_WRITE_FAILURE;
 114       goto error;
 115     }
 116
 117     if (ptr->flags.use_udp && ! to_write)
 118     {
 119       if (send_length > MAX_UDP_DATAGRAM_LENGTH - UDP_DATAGRAM_HEADER_LENGTH)
 120         return MEMCACHED_WRITE_FAILURE;
 121       if (send_length + instance->write_buffer_offset > MAX_UDP_DATAGRAM_LENGTH)
 122         memcached_io_write(instance, NULL, 0, true);
 123     }
 124
 125     rc= memcached_do(instance, buffer, (size_t)send_length, to_write);
 126   }
 127
 128   if (rc != MEMCACHED_SUCCESS)
 129     goto error;
 130
 131   if (! to_write)
 132   {
 133     rc= MEMCACHED_BUFFERED;
 134   }
 135   else if (!no_reply)
 136   {
 137     rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
 138     if (rc == MEMCACHED_DELETED)
 139       rc= MEMCACHED_SUCCESS;
 140   }
 141
 142   if (rc == MEMCACHED_SUCCESS && ptr->delete_trigger)
 143     ptr->delete_trigger(ptr, key, key_length);
 144
 145 error:
 146   LIBMEMCACHED_MEMCACHED_DELETE_END();
 147   return rc;
 148 }
 149
 150 static inline memcached_return_t binary_delete(memcached_st *ptr,
 151                                                uint32_t server_key,
 152                                                const char *key,
 153                                                size_t key_length,
 154                                                bool flush)
 155 {
 156   memcached_server_write_instance_st instance;
 157   protocol_binary_request_delete request= {.bytes= {0}};
 158
 159   instance= memcached_server_instance_fetch(ptr, server_key);
 160
 161   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 162   if (ptr->flags.no_reply)
 163     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
 164   else
 165     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETE;
 166   request.message.header.request.keylen= htons((uint16_t)(key_length + ptr->prefix_key_length));
 167   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 168   request.message.header.request.bodylen= htonl((uint32_t)(key_length + ptr->prefix_key_length));
 169
 170   if (ptr->flags.use_udp && ! flush)
 171   {
 172     size_t cmd_size= sizeof(request.bytes) + key_length;
 173     if (cmd_size > MAX_UDP_DATAGRAM_LENGTH - UDP_DATAGRAM_HEADER_LENGTH)
 174       return MEMCACHED_WRITE_FAILURE;
 175     if (cmd_size + instance->write_buffer_offset > MAX_UDP_DATAGRAM_LENGTH)
 176       memcached_io_write(instance, NULL, 0, true);
 177   }
 178
 179   struct libmemcached_io_vector_st vector[]=
 180   {
 181     { .length= sizeof(request.bytes), .buffer= request.bytes},
 182     { .length= ptr->prefix_key_length, .buffer= ptr->prefix_key },
 183     { .length= key_length, .buffer= key },
 184   };
 185
 186   memcached_return_t rc= MEMCACHED_SUCCESS;
 187
 188   if ((rc= memcached_vdo(instance, vector,  3, flush)) != MEMCACHED_SUCCESS)
 189   {
 190     memcached_io_reset(instance);
 191     rc= (rc == MEMCACHED_SUCCESS) ? MEMCACHED_WRITE_FAILURE : rc;
 192   }
 193
 194   unlikely (ptr->number_of_replicas > 0)
 195   {
 196     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
 197
 198     for (uint32_t x= 0; x < ptr->number_of_replicas; ++x)
 199     {
 200       memcached_server_write_instance_st replica;
 201
 202       ++server_key;
 203       if (server_key == memcached_server_count(ptr))
 204         server_key= 0;
 205
 206       replica= memcached_server_instance_fetch(ptr, server_key);
 207
 208       if (memcached_vdo(replica, vector, 3, flush) != MEMCACHED_SUCCESS)
 209       {
 210         memcached_io_reset(replica);
 211       }
 212       else
 213       {
 214         memcached_server_response_decrement(replica);
 215       }
 216     }
 217   }
 218
 219   return rc;
 220 }