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

   1 #include "common.h"
   2 #include "memcached/protocol_binary.h"
   3
   4 memcached_return 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 binary_delete(memcached_st *ptr,
  12                                              unsigned int server_key,
  13                                              const char *key,
  14                                              size_t key_length,
  15                                              uint8_t flush);
  16
  17 memcached_return 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   uint8_t to_write;
  23   size_t send_length;
  24   memcached_return rc;
  25   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  26   unsigned int server_key;
  27
  28   LIBMEMCACHED_MEMCACHED_DELETE_START();
  29
  30   rc= memcached_validate_key_length(key_length,
  31                                     ptr->flags & MEM_BINARY_PROTOCOL);
  32   unlikely (rc != MEMCACHED_SUCCESS)
  33     return rc;
  34
  35   unlikely (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  36     return MEMCACHED_NO_SERVERS;
  37
  38   server_key= memcached_generate_hash(ptr, master_key, master_key_length);
  39   to_write= (uint8_t) (ptr->flags & MEM_BUFFER_REQUESTS) ? 0 : 1;
  40   bool no_reply= (ptr->flags & MEM_NOREPLY);
  41
  42   if (ptr->flags & MEM_BINARY_PROTOCOL)
  43     rc= binary_delete(ptr, server_key, key, key_length, to_write);
  44   else
  45   {
  46     if (expiration)
  47       send_length= (size_t) snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  48                                      "delete %s%.*s %u%s\r\n",
  49                                      ptr->prefix_key,
  50                                      (int) key_length, key,
  51                                      (uint32_t)expiration, no_reply ? " noreply" :"" );
  52     else
  53        send_length= (size_t) snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  54                                       "delete %s%.*s%s\r\n",
  55                                       ptr->prefix_key,
  56                                       (int)key_length, key, no_reply ? " noreply" :"");
  57
  58     if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  59     {
  60       rc= MEMCACHED_WRITE_FAILURE;
  61       goto error;
  62     }
  63
  64     if (ptr->flags & MEM_USE_UDP && !to_write)
  65     {
  66       if (send_length > MAX_UDP_DATAGRAM_LENGTH - UDP_DATAGRAM_HEADER_LENGTH)
  67         return MEMCACHED_WRITE_FAILURE;
  68       if (send_length + ptr->hosts[server_key].write_buffer_offset > MAX_UDP_DATAGRAM_LENGTH)
  69         memcached_io_write(&ptr->hosts[server_key], NULL, 0, 1);
  70     }
  71
  72     rc= memcached_do(&ptr->hosts[server_key], buffer, send_length, to_write);
  73   }
  74
  75   if (rc != MEMCACHED_SUCCESS)
  76     goto error;
  77
  78   if ((ptr->flags & MEM_BUFFER_REQUESTS))
  79     rc= MEMCACHED_BUFFERED;
  80   else if (!no_reply)
  81   {
  82     rc= memcached_response(&ptr->hosts[server_key], buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  83     if (rc == MEMCACHED_DELETED)
  84       rc= MEMCACHED_SUCCESS;
  85   }
  86
  87   if (rc == MEMCACHED_SUCCESS && ptr->delete_trigger)
  88     ptr->delete_trigger(ptr, key, key_length);
  89
  90 error:
  91   LIBMEMCACHED_MEMCACHED_DELETE_END();
  92   return rc;
  93 }
  94
  95 static inline memcached_return binary_delete(memcached_st *ptr,
  96                                              unsigned int server_key,
  97                                              const char *key,
  98                                              size_t key_length,
  99                                              uint8_t flush)
 100 {
 101   protocol_binary_request_delete request= {.bytes= {0}};
 102
 103   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 104   if (ptr->flags & MEM_NOREPLY)
 105     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
 106   else
 107     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETE;
 108   request.message.header.request.keylen= htons((uint16_t)key_length);
 109   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 110   request.message.header.request.bodylen= htonl((uint32_t) key_length);
 111
 112   if (ptr->flags & MEM_USE_UDP && !flush)
 113   {
 114     size_t cmd_size= sizeof(request.bytes) + key_length;
 115     if (cmd_size > MAX_UDP_DATAGRAM_LENGTH - UDP_DATAGRAM_HEADER_LENGTH)
 116       return MEMCACHED_WRITE_FAILURE;
 117     if (cmd_size + ptr->hosts[server_key].write_buffer_offset > MAX_UDP_DATAGRAM_LENGTH)
 118       memcached_io_write(&ptr->hosts[server_key], NULL, 0, 1);
 119   }
 120
 121   memcached_return rc= MEMCACHED_SUCCESS;
 122
 123   if ((memcached_do(&ptr->hosts[server_key], request.bytes,
 124                     sizeof(request.bytes), 0) != MEMCACHED_SUCCESS) ||
 125       (memcached_io_write(&ptr->hosts[server_key], key,
 126                           key_length, (char) flush) == -1))
 127   {
 128     memcached_io_reset(&ptr->hosts[server_key]);
 129     rc= MEMCACHED_WRITE_FAILURE;
 130   }
 131
 132   unlikely (ptr->number_of_replicas > 0)
 133   {
 134     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_DELETEQ;
 135
 136     for (uint32_t x= 0; x < ptr->number_of_replicas; ++x)
 137     {
 138       ++server_key;
 139       if (server_key == ptr->number_of_hosts)
 140         server_key= 0;
 141
 142       memcached_server_st* server= &ptr->hosts[server_key];
 143       if ((memcached_do(server, (const char*)request.bytes,
 144                         sizeof(request.bytes), 0) != MEMCACHED_SUCCESS) ||
 145           (memcached_io_write(server, key, key_length, (char) flush) == -1))
 146         memcached_io_reset(server);
 147       else
 148         memcached_server_response_decrement(server);
 149     }
 150   }
 151
 152   return rc;
 153 }