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   bool no_reply= (ptr->flags & MEM_NOREPLY);
  14
  15   unlikely (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  16     return MEMCACHED_NO_SERVERS;
  17
  18   if ((ptr->flags & MEM_VERIFY_KEY) && (memcached_key_test((char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  19     return MEMCACHED_BAD_KEY_PROVIDED;
  20
  21   server_key= memcached_generate_hash(ptr, key, key_length);
  22
  23   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  24                         "%s %s%.*s %u%s\r\n", verb,
  25                         ptr->prefix_key,
  26                         (int)key_length, key,
  27                         offset, no_reply ? " noreply" : "");
  28   unlikely (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  29     return MEMCACHED_WRITE_FAILURE;
  30
  31   rc= memcached_do(&ptr->hosts[server_key], buffer, send_length, 1);
  32   if (no_reply || rc != MEMCACHED_SUCCESS)
  33     return rc;
  34
  35   rc= memcached_response(&ptr->hosts[server_key], buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  36
  37   /*
  38     So why recheck responce? Because the protocol is brain dead :)
  39     The number returned might end up equaling one of the string
  40     values. Less chance of a mistake with strncmp() so we will
  41     use it. We still called memcached_response() though since it
  42     worked its magic for non-blocking IO.
  43   */
  44   if (!strncmp(buffer, "ERROR\r\n", 7))
  45   {
  46     *value= 0;
  47     rc= MEMCACHED_PROTOCOL_ERROR;
  48   }
  49   else if (!strncmp(buffer, "NOT_FOUND\r\n", 11))
  50   {
  51     *value= 0;
  52     rc= MEMCACHED_NOTFOUND;
  53   }
  54   else
  55   {
  56     *value= strtoull(buffer, (char **)NULL, 10);
  57     rc= MEMCACHED_SUCCESS;
  58   }
  59
  60   return rc;
  61 }
  62
  63 static memcached_return binary_incr_decr(memcached_st *ptr, uint8_t cmd,
  64                                          const char *key, size_t key_length,
  65                                          uint32_t offset, uint64_t *value)
  66 {
  67   unsigned int server_key;
  68   bool no_reply= (ptr->flags & MEM_NOREPLY);
  69
  70   unlikely (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  71     return MEMCACHED_NO_SERVERS;
  72
  73   server_key= memcached_generate_hash(ptr, key, key_length);
  74
  75   if (no_reply)
  76   {
  77     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
  78       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
  79     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
  80       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
  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   if (no_reply)
 102     return MEMCACHED_SUCCESS;
 103   return memcached_response(&ptr->hosts[server_key], (char*)value, sizeof(*value), NULL);
 104 }
 105
 106 memcached_return memcached_increment(memcached_st *ptr,
 107                                      const char *key, size_t key_length,
 108                                      uint32_t offset,
 109                                      uint64_t *value)
 110 {
 111   memcached_return rc= memcached_validate_key_length(key_length, ptr->flags & MEM_BINARY_PROTOCOL);
 112   unlikely (rc != MEMCACHED_SUCCESS)
 113     return rc;
 114
 115   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 116   if (ptr->flags & MEM_BINARY_PROTOCOL)
 117     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT, key,
 118                          key_length, offset, value);
 119   else
 120      rc= memcached_auto(ptr, "incr", key, key_length, offset, value);
 121
 122   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 123
 124   return rc;
 125 }
 126
 127 memcached_return memcached_decrement(memcached_st *ptr,
 128                                      const char *key, size_t key_length,
 129                                      uint32_t offset,
 130                                      uint64_t *value)
 131 {
 132   memcached_return rc= memcached_validate_key_length(key_length, ptr->flags & MEM_BINARY_PROTOCOL);
 133   unlikely (rc != MEMCACHED_SUCCESS)
 134     return rc;
 135
 136   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 137   if (ptr->flags & MEM_BINARY_PROTOCOL)
 138     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT, key,
 139                          key_length, offset, value);
 140   else
 141     rc= memcached_auto(ptr, "decr", key, key_length, offset, value);
 142
 143   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 144
 145   return rc;
 146 }