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

   1 /*
   2   Memcached library
   3
   4   memcached_response() is used to determine the return result
   5   from an issued command.
   6 */
   7
   8 #include "common.h"
   9 #include "memcached_io.h"
  10
  11 memcached_return memcached_response(memcached_server_st *ptr,
  12                                     char *buffer, size_t buffer_length,
  13                                     memcached_result_st *result)
  14 {
  15   unsigned int x;
  16   size_t send_length;
  17   char *buffer_ptr;
  18   unsigned int max_messages;
  19
  20
  21   send_length= 0;
  22   /* UDP at the moment is odd...*/
  23   if (ptr->type == MEMCACHED_CONNECTION_UDP)
  24   {
  25     char buffer[8];
  26     ssize_t read_length;
  27
  28     return MEMCACHED_SUCCESS;
  29
  30     read_length= memcached_io_read(ptr, buffer, 8);
  31   }
  32
  33   /* We may have old commands in the buffer not set, first purge */
  34   if (ptr->root->flags & MEM_NO_BLOCK)
  35     (void)memcached_io_write(ptr, NULL, 0, 1);
  36
  37   max_messages= memcached_server_response_count(ptr);
  38   for (x= 0; x <  max_messages; x++)
  39   {
  40     size_t total_length= 0;
  41     buffer_ptr= buffer;
  42
  43
  44     while (1)
  45     {
  46       ssize_t read_length;
  47
  48       read_length= memcached_io_read(ptr, buffer_ptr, 1);
  49       WATCHPOINT_ASSERT(isgraph(*buffer_ptr) || isspace(*buffer_ptr));
  50
  51       if (read_length != 1)
  52       {
  53         memcached_io_reset(ptr);
  54         return  MEMCACHED_UNKNOWN_READ_FAILURE;
  55       }
  56
  57       if (*buffer_ptr == '\n')
  58         break;
  59       else
  60         buffer_ptr++;
  61
  62       total_length++;
  63       WATCHPOINT_ASSERT(total_length <= buffer_length);
  64
  65       if (total_length >= buffer_length)
  66       {
  67         memcached_io_reset(ptr);
  68         return MEMCACHED_PROTOCOL_ERROR;
  69       }
  70     }
  71     buffer_ptr++;
  72     *buffer_ptr= 0;
  73
  74     memcached_server_response_decrement(ptr);
  75   }
  76
  77   switch(buffer[0])
  78   {
  79   case 'V': /* VALUE || VERSION */
  80     if (buffer[1] == 'A') /* VALUE */
  81     {
  82       memcached_return rc;
  83
  84       /* We add back in one because we will need to search for END */
  85       memcached_server_response_increment(ptr);
  86       if (result)
  87         rc= value_fetch(ptr, buffer, result);
  88       else
  89         rc= value_fetch(ptr, buffer, &ptr->root->result);
  90
  91       return rc;
  92     }
  93     else if (buffer[1] == 'E') /* VERSION */
  94     {
  95       return MEMCACHED_SUCCESS;
  96     }
  97     else
  98     {
  99       WATCHPOINT_STRING(buffer);
 100       WATCHPOINT_ASSERT(0);
 101       memcached_io_reset(ptr);
 102       return MEMCACHED_UNKNOWN_READ_FAILURE;
 103     }
 104   case 'O': /* OK */
 105     return MEMCACHED_SUCCESS;
 106   case 'S': /* STORED STATS SERVER_ERROR */
 107     {
 108       if (buffer[2] == 'A') /* STORED STATS */
 109       {
 110         memcached_server_response_increment(ptr);
 111         return MEMCACHED_STAT;
 112       }
 113       else if (buffer[1] == 'E')
 114         return MEMCACHED_SERVER_ERROR;
 115       else if (buffer[1] == 'T')
 116         return MEMCACHED_STORED;
 117       else
 118       {
 119         WATCHPOINT_STRING(buffer);
 120         WATCHPOINT_ASSERT(0);
 121         memcached_io_reset(ptr);
 122         return MEMCACHED_UNKNOWN_READ_FAILURE;
 123       }
 124     }
 125   case 'D': /* DELETED */
 126     return MEMCACHED_DELETED;
 127   case 'N': /* NOT_FOUND */
 128     {
 129       if (buffer[4] == 'F')
 130         return MEMCACHED_NOTFOUND;
 131       else if (buffer[4] == 'S')
 132         return MEMCACHED_NOTSTORED;
 133       else
 134       {
 135         memcached_io_reset(ptr);
 136         return MEMCACHED_UNKNOWN_READ_FAILURE;
 137       }
 138     }
 139   case 'E': /* PROTOCOL ERROR or END */
 140     {
 141       if (buffer[1] == 'N')
 142         return MEMCACHED_END;
 143       else if (buffer[1] == 'R')
 144       {
 145         memcached_io_reset(ptr);
 146         return MEMCACHED_PROTOCOL_ERROR;
 147       }
 148       else if (buffer[1] == 'X')
 149       {
 150         memcached_io_reset(ptr);
 151         return MEMCACHED_DATA_EXISTS;
 152       }
 153       else
 154       {
 155         memcached_io_reset(ptr);
 156         return MEMCACHED_UNKNOWN_READ_FAILURE;
 157       }
 158     }
 159   case 'C': /* CLIENT ERROR */
 160     memcached_io_reset(ptr);
 161     return MEMCACHED_CLIENT_ERROR;
 162   default:
 163     memcached_io_reset(ptr);
 164     return MEMCACHED_UNKNOWN_READ_FAILURE;
 165
 166   }
 167
 168   return MEMCACHED_SUCCESS;
 169 }
 170
 171 char *memcached_result_value(memcached_result_st *ptr)
 172 {
 173   memcached_string_st *sptr= &ptr->value;
 174   return memcached_string_value(sptr);
 175 }
 176
 177 size_t memcached_result_length(memcached_result_st *ptr)
 178 {
 179   memcached_string_st *sptr= &ptr->value;
 180   return memcached_string_length(sptr);
 181 }