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

   1 /* LibMemcached
   2  * Copyright (C) 2006-2009 Brian Aker
   3  * All rights reserved.
   4  *
   5  * Use and distribution licensed under the BSD license.  See
   6  * the COPYING file in the parent directory for full text.
   7  *
   8  * Summary: Methods for adding or decrementing values from an object in memcached
   9  *
  10  */
  11
  12 #include "common.h"
  13
  14 static memcached_return_t text_incr_decr(memcached_st *ptr,
  15                                          const char *verb,
  16                                          const char *master_key, size_t master_key_length,
  17                                          const char *key, size_t key_length,
  18                                          uint64_t offset,
  19                                          uint64_t *value)
  20 {
  21   size_t send_length;
  22   memcached_return_t rc;
  23   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  24   uint32_t server_key;
  25   memcached_server_write_instance_st instance;
  26   bool no_reply= ptr->flags.no_reply;
  27
  28   unlikely (memcached_server_count(ptr) == 0)
  29     return MEMCACHED_NO_SERVERS;
  30
  31   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  32     return MEMCACHED_BAD_KEY_PROVIDED;
  33
  34   server_key= memcached_generate_hash_with_redistribution(ptr, master_key, master_key_length);
  35   instance= memcached_server_instance_fetch(ptr, server_key);
  36
  37   send_length= (size_t)snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  38                                 "%s %.*s%.*s %" PRIu64 "%s\r\n", verb,
  39                                 (int)ptr->prefix_key_length,
  40                                 ptr->prefix_key,
  41                                 (int)key_length, key,
  42                                 offset, no_reply ? " noreply" : "");
  43   unlikely (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  44     return MEMCACHED_WRITE_FAILURE;
  45
  46   rc= memcached_do(instance, buffer, send_length, true);
  47   if (no_reply || rc != MEMCACHED_SUCCESS)
  48     return rc;
  49
  50   rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  51
  52   /*
  53     So why recheck responce? Because the protocol is brain dead :)
  54     The number returned might end up equaling one of the string
  55     values. Less chance of a mistake with strncmp() so we will
  56     use it. We still called memcached_response() though since it
  57     worked its magic for non-blocking IO.
  58   */
  59   if (! strncmp(buffer, "ERROR\r\n", 7))
  60   {
  61     *value= 0;
  62     rc= MEMCACHED_PROTOCOL_ERROR;
  63   }
  64   else if (! strncmp(buffer, "CLIENT_ERROR\r\n", 14))
  65   {
  66     *value= 0;
  67     rc= MEMCACHED_PROTOCOL_ERROR;
  68   }
  69   else if (!strncmp(buffer, "NOT_FOUND\r\n", 11))
  70   {
  71     *value= 0;
  72     rc= MEMCACHED_NOTFOUND;
  73   }
  74   else
  75   {
  76     *value= strtoull(buffer, (char **)NULL, 10);
  77     rc= MEMCACHED_SUCCESS;
  78   }
  79
  80   return rc;
  81 }
  82
  83 static memcached_return_t binary_incr_decr(memcached_st *ptr, uint8_t cmd,
  84                                            const char *master_key, size_t master_key_length,
  85                                            const char *key, size_t key_length,
  86                                            uint64_t offset, uint64_t initial,
  87                                            uint32_t expiration,
  88                                            uint64_t *value)
  89 {
  90   uint32_t server_key;
  91   memcached_server_write_instance_st instance;
  92   bool no_reply= ptr->flags.no_reply;
  93
  94   unlikely (memcached_server_count(ptr) == 0)
  95     return MEMCACHED_NO_SERVERS;
  96
  97   server_key= memcached_generate_hash_with_redistribution(ptr, master_key, master_key_length);
  98   instance= memcached_server_instance_fetch(ptr, server_key);
  99
 100   if (no_reply)
 101   {
 102     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
 103       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
 104     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
 105       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
 106   }
 107   protocol_binary_request_incr request= {.bytes= {0}};
 108
 109   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 110   request.message.header.request.opcode= cmd;
 111   request.message.header.request.keylen= htons((uint16_t) key_length);
 112   request.message.header.request.extlen= 20;
 113   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 114   request.message.header.request.bodylen= htonl((uint32_t) (key_length + request.message.header.request.extlen));
 115   request.message.body.delta= htonll(offset);
 116   request.message.body.initial= htonll(initial);
 117   request.message.body.expiration= htonl((uint32_t) expiration);
 118
 119   memcached_return_t rc;
 120   if (((rc= memcached_do(instance, request.bytes,
 121                          sizeof(request.bytes), false)) != MEMCACHED_SUCCESS) ||
 122       (memcached_io_write(instance, key, key_length, true) == -1))
 123   {
 124     memcached_io_reset(instance);
 125     return (rc == MEMCACHED_SUCCESS) ? MEMCACHED_WRITE_FAILURE : rc;
 126   }
 127
 128   if (no_reply)
 129     return MEMCACHED_SUCCESS;
 130   return memcached_response(instance, (char*)value, sizeof(*value), NULL);
 131 }
 132
 133 memcached_return_t memcached_increment(memcached_st *ptr,
 134                                        const char *key, size_t key_length,
 135                                        uint32_t offset,
 136                                        uint64_t *value)
 137 {
 138   return memcached_increment_by_key(ptr, key, key_length, key, key_length, offset, value);
 139 }
 140
 141 memcached_return_t memcached_decrement(memcached_st *ptr,
 142                                        const char *key, size_t key_length,
 143                                        uint32_t offset,
 144                                        uint64_t *value)
 145 {
 146   return memcached_decrement_by_key(ptr, key, key_length, key, key_length, offset, value);
 147 }
 148
 149 memcached_return_t memcached_increment_by_key(memcached_st *ptr,
 150                                               const char *master_key, size_t master_key_length,
 151                                               const char *key, size_t key_length,
 152                                               uint64_t offset,
 153                                               uint64_t *value)
 154 {
 155   memcached_return_t rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol);
 156   unlikely (rc != MEMCACHED_SUCCESS)
 157     return rc;
 158
 159   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 160   if (ptr->flags.binary_protocol)
 161   {
 162     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 163                          master_key, master_key_length, key, key_length,
 164                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 165                          value);
 166   }
 167   else
 168   {
 169      rc= text_incr_decr(ptr, "incr", master_key, master_key_length, key, key_length, offset, value);
 170   }
 171
 172   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 173
 174   return rc;
 175 }
 176
 177 memcached_return_t memcached_decrement_by_key(memcached_st *ptr,
 178                                               const char *master_key, size_t master_key_length,
 179                                               const char *key, size_t key_length,
 180                                               uint64_t offset,
 181                                               uint64_t *value)
 182 {
 183   memcached_return_t rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol);
 184   unlikely (rc != MEMCACHED_SUCCESS)
 185     return rc;
 186
 187   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 188   if (ptr->flags.binary_protocol)
 189   {
 190     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 191                          master_key, master_key_length, key, key_length,
 192                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 193                          value);
 194   }
 195   else
 196   {
 197     rc= text_incr_decr(ptr, "decr", master_key, master_key_length, key, key_length, offset, value);
 198   }
 199
 200   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 201
 202   return rc;
 203 }
 204
 205 memcached_return_t memcached_increment_with_initial(memcached_st *ptr,
 206                                                     const char *key,
 207                                                     size_t key_length,
 208                                                     uint64_t offset,
 209                                                     uint64_t initial,
 210                                                     time_t expiration,
 211                                                     uint64_t *value)
 212 {
 213   return memcached_increment_with_initial_by_key(ptr, key, key_length,
 214                                                  key, key_length,
 215                                                  offset, initial, expiration, value);
 216 }
 217
 218 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *ptr,
 219                                                          const char *master_key,
 220                                                          size_t master_key_length,
 221                                                          const char *key,
 222                                                          size_t key_length,
 223                                                          uint64_t offset,
 224                                                          uint64_t initial,
 225                                                          time_t expiration,
 226                                                          uint64_t *value)
 227 {
 228   memcached_return_t rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol);
 229   unlikely (rc != MEMCACHED_SUCCESS)
 230     return rc;
 231
 232   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 233   if (ptr->flags.binary_protocol)
 234     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 235                          master_key, master_key_length, key, key_length,
 236                          offset, initial, (uint32_t)expiration,
 237                          value);
 238   else
 239     rc= MEMCACHED_PROTOCOL_ERROR;
 240
 241   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 242
 243   return rc;
 244 }
 245
 246 memcached_return_t memcached_decrement_with_initial(memcached_st *ptr,
 247                                                     const char *key,
 248                                                     size_t key_length,
 249                                                     uint64_t offset,
 250                                                     uint64_t initial,
 251                                                     time_t expiration,
 252                                                     uint64_t *value)
 253 {
 254   return memcached_decrement_with_initial_by_key(ptr, key, key_length,
 255                                                  key, key_length,
 256                                                  offset, initial, expiration, value);
 257 }
 258
 259 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *ptr,
 260                                                            const char *master_key,
 261                                                            size_t master_key_length,
 262                                                            const char *key,
 263                                                            size_t key_length,
 264                                                            uint64_t offset,
 265                                                            uint64_t initial,
 266                                                            time_t expiration,
 267                                                            uint64_t *value)
 268 {
 269   memcached_return_t rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol);
 270   unlikely (rc != MEMCACHED_SUCCESS)
 271     return rc;
 272
 273   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 274   if (ptr->flags.binary_protocol)
 275   {
 276     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 277                          master_key, master_key_length, key, key_length,
 278                          offset, initial, (uint32_t)expiration,
 279                          value);
 280   }
 281   else
 282   {
 283     rc= MEMCACHED_PROTOCOL_ERROR;
 284   }
 285
 286   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 287
 288   return rc;
 289 }
 290