git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/memcached_auto.c

   1 #include "common.h"
   2
   3 static memcached_return memcached_auto(memcached_st *ptr,
   4                                        const char *verb,
   5                                        const char *key, size_t key_length,
   6                                        unsigned int offset,
   7                                        uint64_t *value)
   8 {
   9   size_t send_length;
  10   memcached_return rc;
  11   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  12   unsigned int server_key;
  13
  14   unlikely (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  15     return MEMCACHED_NO_SERVERS;
  16
  17   if ((ptr->flags & MEM_VERIFY_KEY) && (memcachd_key_test((char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  18     return MEMCACHED_BAD_KEY_PROVIDED;
  19
  20   server_key= memcached_generate_hash(ptr, key, key_length);
  21
  22   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  23                         "%s %s%.*s %u\r\n", verb,
  24                         ptr->prefix_key,
  25                         (int)key_length, key,
  26                         offset);
  27   unlikely (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  28     return MEMCACHED_WRITE_FAILURE;
  29
  30   rc= memcached_do(&ptr->hosts[server_key], buffer, send_length, 1);
  31   if (rc != MEMCACHED_SUCCESS)
  32     return rc;
  33
  34   rc= memcached_response(&ptr->hosts[server_key], buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  35
  36   /*
  37     So why recheck responce? Because the protocol is brain dead :)
  38     The number returned might end up equaling one of the string
  39     values. Less chance of a mistake with strncmp() so we will
  40     use it. We still called memcached_response() though since it
  41     worked its magic for non-blocking IO.
  42   */
  43   if (!strncmp(buffer, "ERROR\r\n", 7))
  44   {
  45     *value= 0;
  46     rc= MEMCACHED_PROTOCOL_ERROR;
  47   }
  48   else if (!strncmp(buffer, "NOT_FOUND\r\n", 11))
  49   {
  50     *value= 0;
  51     rc= MEMCACHED_NOTFOUND;
  52   }
  53   else
  54   {
  55     *value= strtoull(buffer, (char **)NULL, 10);
  56     rc= MEMCACHED_SUCCESS;
  57   }
  58
  59   return rc;
  60 }
  61
  62 static memcached_return binary_incr_decr(memcached_st *ptr, uint8_t cmd,
  63                                          const char *key, size_t key_length,
  64                                          uint32_t offset, uint64_t *value)
  65 {
  66   unsigned int server_key;
  67
  68   unlikely (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  69     return MEMCACHED_NO_SERVERS;
  70
  71   server_key= memcached_generate_hash(ptr, key, key_length);
  72
  73   protocol_binary_request_incr request= {.bytes= {0}};
  74
  75   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
  76   request.message.header.request.opcode= cmd;
  77   request.message.header.request.keylen= htons((uint16_t)key_length);
  78   request.message.header.request.extlen= 20;
  79   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  80   request.message.header.request.bodylen= htonl(key_length + request.message.header.request.extlen);
  81   request.message.body.delta= htonll(offset);
  82
  83   /* TODO: The binary protocol allows you to specify initial and expiry time */
  84   if ((memcached_do(&ptr->hosts[server_key], request.bytes,
  85                     sizeof(request.bytes), 0)!=MEMCACHED_SUCCESS) ||
  86       (memcached_io_write(&ptr->hosts[server_key], key, key_length, 1) == -1))
  87   {
  88     memcached_io_reset(&ptr->hosts[server_key]);
  89     return MEMCACHED_WRITE_FAILURE;
  90   }
  91
  92   return memcached_response(&ptr->hosts[server_key], (char*)value, sizeof(*value), NULL);
  93 }
  94
  95 memcached_return memcached_increment(memcached_st *ptr,
  96                                      const char *key, size_t key_length,
  97                                      uint32_t offset,
  98                                      uint64_t *value)
  99 {
 100   memcached_return rc= memcached_validate_key_length(key_length, ptr->flags & MEM_BINARY_PROTOCOL);
 101   unlikely (rc != MEMCACHED_SUCCESS)
 102     return rc;
 103
 104   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 105   if (ptr->flags & MEM_BINARY_PROTOCOL)
 106     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT, key,
 107                          key_length, offset, value);
 108   else
 109      rc= memcached_auto(ptr, "incr", key, key_length, offset, value);
 110
 111   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 112
 113   return rc;
 114 }
 115
 116 memcached_return memcached_decrement(memcached_st *ptr,
 117                                      const char *key, size_t key_length,
 118                                      uint32_t offset,
 119                                      uint64_t *value)
 120 {
 121   memcached_return rc= memcached_validate_key_length(key_length, ptr->flags & MEM_BINARY_PROTOCOL);
 122   unlikely (rc != MEMCACHED_SUCCESS)
 123     return rc;
 124
 125   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 126   if (ptr->flags & MEM_BINARY_PROTOCOL)
 127     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT, key,
 128                          key_length, offset, value);
 129   else
 130     rc= memcached_auto(ptr, "decr", key, key_length, offset, value);
 131
 132   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 133
 134   return rc;
 135 }