git.m6w6.name Git - awesomized/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   size_t send_length;
  24   memcached_return_t rc;
  25   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  26   uint32_t server_key;
  27   memcached_server_write_instance_st instance;
  28
  29   LIBMEMCACHED_MEMCACHED_DELETE_START();
  30
  31   rc= memcached_validate_key_length(key_length,
  32                                     ptr->flags.binary_protocol);
  33   unlikely (rc != MEMCACHED_SUCCESS)
  34     return rc;
  35
  36   unlikely (memcached_server_count(ptr) == 0)
  37     return MEMCACHED_NO_SERVERS;
  38
  39   server_key= memcached_generate_hash_with_redistribution(ptr, master_key, master_key_length);
  40   instance= memcached_server_instance_fetch(ptr, server_key);
  41
  42   to_write= (ptr->flags.buffer_requests) ? false : true;
  43
  44   bool no_reply= (ptr->flags.no_reply);
  45
  46   if (ptr->flags.binary_protocol)
  47   {
  48     likely (! expiration)
  49     {
  50       rc= binary_delete(ptr, server_key, key, key_length, to_write);
  51     }
  52     else
  53     {
  54       rc= MEMCACHED_INVALID_ARGUMENTS;
  55     }
  56   }
  57   else
  58   {
  59     unlikely (expiration)
  60     {
  61        if ((instance->major_version == 1 &&
  62             instance->minor_version > 2) ||
  63            instance->major_version > 1)
  64        {
  65          rc= MEMCACHED_INVALID_ARGUMENTS;
  66          goto error;
  67        }
  68        else
  69        {
  70           /* ensure that we are connected, otherwise we might bump the
  71            * command counter before connection */
  72           if ((rc= memcached_connect(instance)) != MEMCACHED_SUCCESS)
  73           {
  74             WATCHPOINT_ERROR(rc);
  75             return rc;
  76           }
  77
  78           if (instance->minor_version == 0)
  79           {
  80              if (no_reply || ! to_write)
  81              {
  82                 /* We might get out of sync with the server if we
  83                  * send this command to a server newer than 1.2.x..
  84                  * disable no_reply and buffered mode.
  85                  */
  86                 to_write= true;
  87                 if (no_reply)
  88                    memcached_server_response_increment(instance);
  89                 no_reply= false;
  90              }
  91           }
  92           send_length= (size_t) snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  93                                          "delete %.*s%.*s %u%s\r\n",
  94                                          (int)ptr->prefix_key_length,
  95                                          ptr->prefix_key,
  96                                          (int) key_length, key,
  97                                          (uint32_t)expiration,
  98                                          no_reply ? " noreply" :"" );
  99        }
 100     }
 101     else
 102     {
 103       send_length= (size_t) snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
 104                                      "delete %.*s%.*s%s\r\n",
 105                                      (int)ptr->prefix_key_length,
 106                                      ptr->prefix_key,
 107                                      (int)key_length, key, no_reply ? " noreply" :"");
 108     }
 109
 110     if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
 111     {
 112       rc= MEMCACHED_WRITE_FAILURE;
 113       goto error;
 114     }
 115
 116     if (ptr->flags.use_udp && ! to_write)
 117     {
 118       if (send_length > MAX_UDP_DATAGRAM_LENGTH - UDP_DATAGRAM_HEADER_LENGTH)
 119         return MEMCACHED_WRITE_FAILURE;
 120       if (send_length + instance->write_buffer_offset > MAX_UDP_DATAGRAM_LENGTH)
 121         memcached_io_write(instance, NULL, 0, true);
 122     }
 123
 124     rc= memcached_do(instance, buffer, send_length, to_write);
 125   }
 126
 127   if (rc != MEMCACHED_SUCCESS)
 128     goto error;
 129
 130   if (! to_write)
 131   {
 132     rc= MEMCACHED_BUFFERED;
 133   }
 134   else if (!no_reply)
 135   {
 136     rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
 137     if (rc == MEMCACHED_DELETED)
 138       rc= MEMCACHED_SUCCESS;
 139   }
 140
 141   if (rc == MEMCACHED_SUCCESS && ptr->delete_trigger)
 142     ptr->delete_trigger(ptr, key, key_length);
 143
 144 error:
 145   LIBMEMCACHED_MEMCACHED_DELETE_END();
 146   return rc;
 147 }
 148
 149 static inline memcached_return_t binary_delete(memcached_st *ptr,
 150                                                uint32_t server_key,
 151                                                const char *key,
 152                                                size_t key_length,
 153                                                bool flush)
 154 {
 155   memcached_server_write_instance_st instance;
 156   protocol_binary_request_delete request= {.bytes= {0}};
 157
 158   instance= memcached_server_instance_fetch(ptr, server_key);
 159
 160   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 161   if (ptr->flags.no_reply)
 162     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
 163   else
 164     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETE;
 165   request.message.header.request.keylen= htons((uint16_t)(key_length + ptr->prefix_key_length));
 166   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 167   request.message.header.request.bodylen= htonl((uint32_t)(key_length + ptr->prefix_key_length));
 168
 169   if (ptr->flags.use_udp && ! flush)
 170   {
 171     size_t cmd_size= sizeof(request.bytes) + key_length;
 172     if (cmd_size > MAX_UDP_DATAGRAM_LENGTH - UDP_DATAGRAM_HEADER_LENGTH)
 173       return MEMCACHED_WRITE_FAILURE;
 174     if (cmd_size + instance->write_buffer_offset > MAX_UDP_DATAGRAM_LENGTH)
 175       memcached_io_write(instance, NULL, 0, true);
 176   }
 177
 178   struct __write_vector_st vector[]=
 179   {
 180     { .length= sizeof(request.bytes), .buffer= request.bytes},
 181     { .length= ptr->prefix_key_length, .buffer= ptr->prefix_key },
 182     { .length= key_length, .buffer= key },
 183   };
 184
 185   memcached_return_t rc= MEMCACHED_SUCCESS;
 186
 187   if ((rc= memcached_vdo(instance, vector,  3, flush)) != MEMCACHED_SUCCESS)
 188   {
 189     memcached_io_reset(instance);
 190     rc= (rc == MEMCACHED_SUCCESS) ? MEMCACHED_WRITE_FAILURE : rc;
 191   }
 192
 193   unlikely (ptr->number_of_replicas > 0)
 194   {
 195     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
 196
 197     for (uint32_t x= 0; x < ptr->number_of_replicas; ++x)
 198     {
 199       memcached_server_write_instance_st replica;
 200
 201       ++server_key;
 202       if (server_key == memcached_server_count(ptr))
 203         server_key= 0;
 204
 205       replica= memcached_server_instance_fetch(ptr, server_key);
 206
 207       if (memcached_vdo(replica, vector, 3, flush) != MEMCACHED_SUCCESS)
 208       {
 209         memcached_io_reset(replica);
 210       }
 211       else
 212       {
 213         memcached_server_response_decrement(replica);
 214       }
 215     }
 216   }
 217
 218   return rc;
 219 }