git.m6w6.name Git - m6w6/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((const 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= (size_t)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                                          uint64_t offset, uint64_t initial,
  66                                          time_t expiration,
  67                                          uint64_t *value)
  68 {
  69   unsigned int server_key;
  70   bool no_reply= (ptr->flags & MEM_NOREPLY);
  71
  72   unlikely (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  73     return MEMCACHED_NO_SERVERS;
  74
  75   server_key= memcached_generate_hash(ptr, key, key_length);
  76
  77   if (no_reply)
  78   {
  79     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
  80       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
  81     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
  82       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
  83   }
  84   protocol_binary_request_incr request= {.bytes= {0}};
  85
  86   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
  87   request.message.header.request.opcode= cmd;
  88   request.message.header.request.keylen= htons((uint16_t) key_length);
  89   request.message.header.request.extlen= 20;
  90   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  91   request.message.header.request.bodylen= htonl((uint32_t) (key_length + request.message.header.request.extlen));
  92   request.message.body.delta= htonll(offset);
  93   request.message.body.initial= htonll(initial);
  94   request.message.body.expiration= htonl((uint32_t) expiration);
  95
  96   if ((memcached_do(&ptr->hosts[server_key], request.bytes,
  97                     sizeof(request.bytes), 0)!=MEMCACHED_SUCCESS) ||
  98       (memcached_io_write(&ptr->hosts[server_key], key, key_length, 1) == -1))
  99   {
 100     memcached_io_reset(&ptr->hosts[server_key]);
 101     return MEMCACHED_WRITE_FAILURE;
 102   }
 103
 104   if (no_reply)
 105     return MEMCACHED_SUCCESS;
 106   return memcached_response(&ptr->hosts[server_key], (char*)value, sizeof(*value), NULL);
 107 }
 108
 109 memcached_return memcached_increment(memcached_st *ptr,
 110                                      const char *key, size_t key_length,
 111                                      uint32_t offset,
 112                                      uint64_t *value)
 113 {
 114   memcached_return rc= memcached_validate_key_length(key_length, ptr->flags & MEM_BINARY_PROTOCOL);
 115   unlikely (rc != MEMCACHED_SUCCESS)
 116     return rc;
 117
 118   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 119   if (ptr->flags & MEM_BINARY_PROTOCOL)
 120     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT, key, key_length,
 121                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 122                          value);
 123   else
 124      rc= memcached_auto(ptr, "incr", key, key_length, offset, value);
 125
 126   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 127
 128   return rc;
 129 }
 130
 131 memcached_return memcached_decrement(memcached_st *ptr,
 132                                      const char *key, size_t key_length,
 133                                      uint32_t offset,
 134                                      uint64_t *value)
 135 {
 136   memcached_return rc= memcached_validate_key_length(key_length, ptr->flags & MEM_BINARY_PROTOCOL);
 137   unlikely (rc != MEMCACHED_SUCCESS)
 138     return rc;
 139
 140   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 141   if (ptr->flags & MEM_BINARY_PROTOCOL)
 142     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT, key, key_length,
 143                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 144                          value);
 145   else
 146     rc= memcached_auto(ptr, "decr", key, key_length, offset, value);
 147
 148   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 149
 150   return rc;
 151 }
 152
 153 memcached_return memcached_increment_with_initial(memcached_st *ptr,
 154                                                   const char *key,
 155                                                   size_t key_length,
 156                                                   uint64_t offset,
 157                                                   uint64_t initial,
 158                                                   time_t expiration,
 159                                                   uint64_t *value)
 160 {
 161   memcached_return rc= memcached_validate_key_length(key_length, ptr->flags & MEM_BINARY_PROTOCOL);
 162   unlikely (rc != MEMCACHED_SUCCESS)
 163     return rc;
 164
 165   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 166   if (ptr->flags & MEM_BINARY_PROTOCOL)
 167     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT, key,
 168                          key_length, offset, initial, expiration, value);
 169   else
 170     rc= MEMCACHED_PROTOCOL_ERROR;
 171
 172   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 173
 174   return rc;
 175 }
 176
 177 memcached_return memcached_decrement_with_initial(memcached_st *ptr,
 178                                                   const char *key,
 179                                                   size_t key_length,
 180                                                   uint64_t offset,
 181                                                   uint64_t initial,
 182                                                   time_t expiration,
 183                                                   uint64_t *value)
 184 {
 185   memcached_return rc= memcached_validate_key_length(key_length, ptr->flags & MEM_BINARY_PROTOCOL);
 186   unlikely (rc != MEMCACHED_SUCCESS)
 187     return rc;
 188
 189   LIBMEMCACHED_MEMCACHED_DECREMENT_WITH_INITIAL_START();
 190   if (ptr->flags & MEM_BINARY_PROTOCOL)
 191     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT, key,
 192                          key_length, offset, initial, expiration, value);
 193   else
 194     rc= MEMCACHED_PROTOCOL_ERROR;
 195
 196   LIBMEMCACHED_MEMCACHED_DECREMENT_WITH_INITIAL_END();
 197
 198   return rc;
 199 }