git.m6w6.name Git - awesomized/libmemcached/blob - lib/memcached_get.c

   1 #include "common.h"
   2
   3 static char *memcached_value_fetch(memcached_st *ptr, char *key, size_t *key_length,
   4                                    size_t *value_length,
   5                                    uint16_t *flags,
   6                                    memcached_return *error,
   7                                    char load_key,
   8                                    unsigned int server_key)
   9 {
  10   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  11   char *string_ptr;
  12   char *end_ptr;
  13
  14   assert(value_length);
  15   assert(flags);
  16   assert(error);
  17
  18   end_ptr= buffer + MEMCACHED_DEFAULT_COMMAND_SIZE;
  19
  20   *value_length= 0;
  21
  22   memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
  23   *error= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
  24
  25   if (*error == MEMCACHED_SUCCESS)
  26   {
  27     char *next_ptr;
  28
  29     string_ptr= buffer;
  30     string_ptr+= 6; /* "VALUE " */
  31
  32     /* We load the key */
  33     if (load_key)
  34     {
  35       memset(key, 0, MEMCACHED_MAX_KEY);
  36       for (; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++)
  37       {
  38         *key= *string_ptr;
  39         key++;
  40       }
  41     }
  42     else /* Skip characters */
  43       for (; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++);
  44
  45     if (end_ptr == string_ptr)
  46         goto read_error;
  47
  48     /* Flags fetch move past space */
  49     string_ptr++;
  50     if (end_ptr == string_ptr)
  51         goto read_error;
  52     for (next_ptr= string_ptr; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++);
  53     *flags= (uint16_t)strtol(next_ptr, &string_ptr, 10);
  54
  55     if (end_ptr == string_ptr)
  56         goto read_error;
  57
  58     /* Length fetch move past space*/
  59     string_ptr++;
  60     if (end_ptr == string_ptr)
  61         goto read_error;
  62
  63     for (next_ptr= string_ptr; end_ptr == string_ptr || *string_ptr != ' '; string_ptr++);
  64     *value_length= (size_t)strtoll(next_ptr, &string_ptr, 10);
  65
  66     if (end_ptr == string_ptr)
  67         goto read_error;
  68
  69     /* Skip past the \r\n */
  70     string_ptr+= 2;
  71
  72     if (end_ptr < string_ptr)
  73         goto read_error;
  74
  75     if (*value_length)
  76     {
  77       size_t read_length;
  78       size_t partial_length;
  79       size_t to_read;
  80       char *value;
  81       char *value_ptr;
  82
  83       /* We add two bytes so that we can walk the \r\n */
  84       value= (char *)malloc(((*value_length) +2) * sizeof(char));
  85       memset(value, 0, ((*value_length) +2) * sizeof(char));
  86
  87       if (!value)
  88       {
  89         *value_length= 0;
  90         *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  91         return NULL;
  92       }
  93
  94       value_ptr= value;
  95       read_length= 0;
  96       to_read= (*value_length) + 2;
  97       /* This is overkill */
  98       while ((partial_length= recv(ptr->hosts[server_key].fd, value_ptr, to_read, 0)) > 0)
  99       {
 100         value_ptr+= partial_length;
 101         read_length+= partial_length;
 102         to_read-= partial_length;
 103         if (read_length == (size_t)(*value_length + 2))
 104           break;
 105       }
 106
 107       if (read_length != (size_t)(*value_length + 2))
 108       {
 109         free(value);
 110         goto read_error;
 111       }
 112
 113       return value;
 114     }
 115   }
 116
 117   return NULL;
 118 read_error:
 119   *error= MEMCACHED_PARTIAL_READ;
 120   return NULL;
 121 }
 122
 123 char *memcached_get(memcached_st *ptr, char *key, size_t key_length,
 124                     size_t *value_length,
 125                     uint16_t *flags,
 126                     memcached_return *error)
 127 {
 128   size_t send_length;
 129   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 130   unsigned int server_key;
 131   char *value;
 132   memcached_return rc;
 133   LIBMEMCACHED_MEMCACHED_GET_START();
 134
 135   *value_length= 0;
 136   *error= memcached_connect(ptr);
 137
 138   if (*error != MEMCACHED_SUCCESS)
 139     return NULL;
 140
 141   server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
 142
 143   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, "get %.*s\r\n",
 144                         (int)key_length, key);
 145   if (*error != MEMCACHED_SUCCESS)
 146     return NULL;
 147
 148   if ((send(ptr->hosts[server_key].fd, buffer, send_length, 0) == -1))
 149   {
 150     *error= MEMCACHED_WRITE_FAILURE;
 151     return NULL;
 152   }
 153
 154   value= memcached_value_fetch(ptr, key, &key_length, value_length, flags,
 155                                error, 0, server_key);
 156   /* We need to read END */
 157   rc= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
 158   if (rc != MEMCACHED_NOTFOUND)
 159   {
 160     free(value);
 161     *value_length= 0;
 162     *error= MEMCACHED_PROTOCOL_ERROR;
 163   }
 164   LIBMEMCACHED_MEMCACHED_GET_END();
 165
 166   return value;
 167 }
 168
 169 memcached_return memcached_mget(memcached_st *ptr,
 170                                 char **keys, size_t *key_length,
 171                                 unsigned int number_of_keys)
 172 {
 173   char buffer[HUGE_STRING_LEN];
 174   unsigned int x;
 175   memcached_return rc;
 176   memcached_string_st **cursor_key_exec;
 177   LIBMEMCACHED_MEMCACHED_MGET_START();
 178
 179   ptr->cursor_server= 0;
 180   memset(buffer, 0, HUGE_STRING_LEN);
 181
 182   rc= memcached_connect(ptr);
 183
 184   if (rc != MEMCACHED_SUCCESS)
 185     return rc;
 186
 187   cursor_key_exec= (memcached_string_st **)malloc(sizeof(memcached_string_st *) * ptr->number_of_hosts);
 188   memset(cursor_key_exec, 0, sizeof(memcached_string_st *) * ptr->number_of_hosts);
 189
 190
 191   for (x= 0; x < number_of_keys; x++)
 192   {
 193     unsigned int server_key;
 194
 195     server_key= memcached_generate_hash(keys[x], key_length[x]) % ptr->number_of_hosts;
 196
 197     if (cursor_key_exec[server_key])
 198     {
 199       memcached_string_st *string= cursor_key_exec[server_key];
 200
 201       memcached_string_append_character(ptr, string, ' ');
 202       memcached_string_append(ptr, string, keys[x], key_length[x]);
 203     }
 204     else
 205     {
 206       memcached_string_st *string= memcached_string_init(ptr, SMALL_STRING_LEN);
 207
 208       /* We need to figure out the correct way to error in case of this failure */
 209       if (!string)
 210         assert(0);
 211
 212       memcached_string_append(ptr, string, "get ", 4);
 213       memcached_string_append(ptr, string, keys[x], key_length[x]);
 214
 215       cursor_key_exec[server_key]= string;
 216     }
 217   }
 218
 219
 220   /*
 221     Should we muddle on if some servers are dead?
 222   */
 223   for (x= 0; x < ptr->number_of_hosts; x++)
 224   {
 225     if (cursor_key_exec[x])
 226     {
 227       memcached_string_st *string= cursor_key_exec[x];
 228       memcached_string_append(ptr, string, "\r\n", 2);
 229
 230       if ((send(ptr->hosts[x].fd, string->string,
 231                  memcached_string_length(ptr, string), 0) == -1))
 232       {
 233         memcached_quit(ptr);
 234         rc= MEMCACHED_SOME_ERRORS;
 235       }
 236       memcached_string_free(ptr, string);
 237       cursor_key_exec[x]= NULL; /* Remove warning */
 238     }
 239   }
 240
 241   free(cursor_key_exec);
 242
 243   LIBMEMCACHED_MEMCACHED_MGET_END();
 244   return rc;
 245 }
 246
 247 char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length,
 248                     size_t *value_length,
 249                     uint16_t *flags,
 250                     memcached_return *error)
 251 {
 252   char *value_check;
 253
 254   while (ptr->cursor_server < ptr->number_of_hosts)
 255   {
 256     value_check= memcached_value_fetch(ptr, key, key_length, value_length, flags,
 257                                        error, 1, ptr->cursor_server);
 258
 259     if (*error == MEMCACHED_NOTFOUND)
 260       ptr->cursor_server++;
 261     else if (*error != MEMCACHED_SUCCESS)
 262       return NULL;
 263     else
 264       return value_check;
 265   }
 266
 267   return NULL;
 268 }