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

   1 #include <memcached.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
 132   *value_length= 0;
 133   *error= memcached_connect(ptr);
 134
 135   if (*error != MEMCACHED_SUCCESS)
 136     return NULL;
 137
 138   server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
 139
 140   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, "get %.*s\r\n",
 141                         (int)key_length, key);
 142   if (*error != MEMCACHED_SUCCESS)
 143     return NULL;
 144
 145   if ((send(ptr->hosts[server_key].fd, buffer, send_length, 0) == -1))
 146   {
 147     *error= MEMCACHED_WRITE_FAILURE;
 148     return NULL;
 149   }
 150
 151   return memcached_value_fetch(ptr, key, &key_length, value_length, flags,
 152                                error, 0, server_key);
 153 }
 154
 155 memcached_return memcached_mget(memcached_st *ptr,
 156                                 char **keys, size_t *key_length,
 157                                 unsigned int number_of_keys)
 158 {
 159   char buffer[HUGE_STRING_LEN];
 160   unsigned int x;
 161   memcached_return rc;
 162   memcached_string_st **cursor_key_exec;
 163
 164   ptr->cursor_server= 0;
 165   memset(buffer, 0, HUGE_STRING_LEN);
 166
 167   rc= memcached_connect(ptr);
 168
 169   if (rc != MEMCACHED_SUCCESS)
 170     return rc;
 171
 172   cursor_key_exec= (memcached_string_st **)malloc(sizeof(memcached_string_st *) * ptr->number_of_hosts);
 173   memset(cursor_key_exec, 0, sizeof(memcached_string_st *) * ptr->number_of_hosts);
 174
 175
 176   for (x= 0; x < number_of_keys; x++)
 177   {
 178     unsigned int server_key;
 179
 180     server_key= memcached_generate_hash(keys[x], key_length[x]) % ptr->number_of_hosts;
 181
 182     if (cursor_key_exec[server_key])
 183     {
 184       memcached_string_st *string= cursor_key_exec[server_key];
 185
 186       memcached_string_append_character(ptr, string, ' ');
 187       memcached_string_append(ptr, string, keys[x], key_length[x]);
 188     }
 189     else
 190     {
 191       memcached_string_st *string= memcached_string_init(ptr, SMALL_STRING_LEN);
 192
 193       /* We need to figure out the correct way to error in case of this failure */
 194       if (!string)
 195         assert(0);
 196
 197       memcached_string_append(ptr, string, "get ", 4);
 198       memcached_string_append(ptr, string, keys[x], key_length[x]);
 199
 200       cursor_key_exec[server_key]= string;
 201     }
 202   }
 203
 204
 205   /*
 206     Should we muddle on if some servers are dead?
 207   */
 208   for (x= 0; x < ptr->number_of_hosts; x++)
 209   {
 210     if (cursor_key_exec[x])
 211     {
 212       memcached_string_st *string= cursor_key_exec[x];
 213       memcached_string_append(ptr, string, "\r\n", 2);
 214
 215       if ((send(ptr->hosts[x].fd, string->string,
 216                  memcached_string_length(ptr, string), 0) == -1))
 217       {
 218         memcached_quit(ptr);
 219         rc= MEMCACHED_SOME_ERRORS;
 220       }
 221       memcached_string_free(ptr, string);
 222       cursor_key_exec[x]= NULL; /* Remove warning */
 223     }
 224   }
 225
 226   free(cursor_key_exec);
 227
 228   return rc;
 229 }
 230
 231 char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length,
 232                     size_t *value_length,
 233                     uint16_t *flags,
 234                     memcached_return *error)
 235 {
 236   char *value_check;
 237
 238   while (ptr->cursor_server < ptr->number_of_hosts)
 239   {
 240     value_check= memcached_value_fetch(ptr, key, key_length, value_length, flags,
 241                                        error, 1, ptr->cursor_server);
 242
 243     if (*error == MEMCACHED_NOTFOUND)
 244       ptr->cursor_server++;
 245     else if (*error != MEMCACHED_SUCCESS)
 246       return NULL;
 247     else
 248       return value_check;
 249   }
 250
 251   return NULL;
 252 }