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 (key_length == 0)
  15     return MEMCACHED_NO_KEY_PROVIDED;
  16
  17   unlikely (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  18     return MEMCACHED_NO_SERVERS;
  19
  20   if ((ptr->flags & MEM_VERIFY_KEY) && (memcachd_key_test((char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  21     return MEMCACHED_BAD_KEY_PROVIDED;
  22
  23   server_key= memcached_generate_hash(ptr, key, key_length);
  24
  25   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  26                         "%s %s%.*s %u\r\n", verb,
  27                         ptr->prefix_key,
  28                         (int)key_length, key,
  29                         offset);
  30   unlikely (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  31     return MEMCACHED_WRITE_FAILURE;
  32
  33   rc= memcached_do(&ptr->hosts[server_key], buffer, send_length, 1);
  34   if (rc != MEMCACHED_SUCCESS)
  35     return rc;
  36
  37   rc= memcached_response(&ptr->hosts[server_key], buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  38
  39   /*
  40     So why recheck responce? Because the protocol is brain dead :)
  41     The number returned might end up equaling one of the string
  42     values. Less chance of a mistake with strncmp() so we will
  43     use it. We still called memcached_response() though since it
  44     worked its magic for non-blocking IO.
  45   */
  46   if (!strncmp(buffer, "ERROR\r\n", 7))
  47   {
  48     *value= 0;
  49     rc= MEMCACHED_PROTOCOL_ERROR;
  50   }
  51   else if (!strncmp(buffer, "NOT_FOUND\r\n", 11))
  52   {
  53     *value= 0;
  54     rc= MEMCACHED_NOTFOUND;
  55   }
  56   else
  57   {
  58     *value= strtoull(buffer, (char **)NULL, 10);
  59     rc= MEMCACHED_SUCCESS;
  60   }
  61
  62   return rc;
  63 }
  64
  65 static memcached_return binary_incr_decr(memcached_st *ptr, uint8_t cmd,
  66                                          const char *key, size_t key_length,
  67                                          uint32_t offset, uint64_t *value)
  68 {
  69   unsigned int server_key;
  70
  71   unlikely (key_length == 0)
  72     return MEMCACHED_NO_KEY_PROVIDED;
  73
  74   unlikely (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  75     return MEMCACHED_NO_SERVERS;
  76
  77   if ((ptr->flags & MEM_VERIFY_KEY) && (memcachd_key_test((char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  78     return MEMCACHED_BAD_KEY_PROVIDED;
  79
  80   server_key= memcached_generate_hash(ptr, key, key_length);
  81
  82   protocol_binary_request_incr request= {.bytes= {0}};
  83
  84   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
  85   request.message.header.request.opcode= cmd;
  86   request.message.header.request.keylen= htons((uint16_t)key_length);
  87   request.message.header.request.extlen= 20;
  88   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  89   request.message.header.request.bodylen= htonl(key_length + request.message.header.request.extlen);
  90   request.message.body.delta= htonll(offset);
  91
  92   /* TODO: The binary protocol allows you to specify initial and expiry time */
  93   if ((memcached_do(&ptr->hosts[server_key], request.bytes,
  94                     sizeof(request.bytes), 0)!=MEMCACHED_SUCCESS) ||
  95       (memcached_io_write(&ptr->hosts[server_key], key, key_length, 1) == -1))
  96   {
  97     memcached_io_reset(&ptr->hosts[server_key]);
  98     return MEMCACHED_WRITE_FAILURE;
  99   }
 100
 101   return memcached_response(&ptr->hosts[server_key], (char*)value, sizeof(*value), NULL);
 102 }
 103
 104 memcached_return memcached_increment(memcached_st *ptr,
 105                                      const char *key, size_t key_length,
 106                                      uint32_t offset,
 107                                      uint64_t *value)
 108 {
 109   memcached_return rc;
 110
 111   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 112   if (ptr->flags & MEM_BINARY_PROTOCOL)
 113     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT, key,
 114                          key_length, offset, value);
 115   else
 116      rc= memcached_auto(ptr, "incr", key, key_length, offset, value);
 117
 118   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 119
 120   return rc;
 121 }
 122
 123 memcached_return memcached_decrement(memcached_st *ptr,
 124                                      const char *key, size_t key_length,
 125                                      uint32_t offset,
 126                                      uint64_t *value)
 127 {
 128   memcached_return rc;
 129
 130   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 131   if (ptr->flags & MEM_BINARY_PROTOCOL)
 132     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT, key,
 133                          key_length, offset, value);
 134   else
 135     rc= memcached_auto(ptr, "decr", key, key_length, offset, value);
 136
 137   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 138
 139   return rc;
 140 }