git.m6w6.name Git - m6w6/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   memcached_return_t rc;
  22   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  23   uint32_t server_key;
  24   memcached_server_write_instance_st instance;
  25   bool no_reply= ptr->flags.no_reply;
  26
  27   unlikely (memcached_server_count(ptr) == 0)
  28     return MEMCACHED_NO_SERVERS;
  29
  30   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  31     return MEMCACHED_BAD_KEY_PROVIDED;
  32
  33   server_key= memcached_generate_hash_with_redistribution(ptr, master_key, master_key_length);
  34   instance= memcached_server_instance_fetch(ptr, server_key);
  35
  36   int send_length;
  37   send_length= 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   if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE || send_length < 0)
  44     return MEMCACHED_WRITE_FAILURE;
  45
  46   rc= memcached_do(instance, buffer, (size_t)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 + ptr->prefix_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 + ptr->prefix_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   struct libmemcached_io_vector_st vector[]=
 120   {
 121     { .length= sizeof(request.bytes), .buffer= request.bytes },
 122     { .length= ptr->prefix_key_length, .buffer= ptr->prefix_key },
 123     { .length= key_length, .buffer= key }
 124   };
 125
 126   memcached_return_t rc;
 127   if ((rc= memcached_vdo(instance, vector, 3, true)) != MEMCACHED_SUCCESS)
 128   {
 129     memcached_io_reset(instance);
 130     return (rc == MEMCACHED_SUCCESS) ? MEMCACHED_WRITE_FAILURE : rc;
 131   }
 132
 133   if (no_reply)
 134     return MEMCACHED_SUCCESS;
 135   return memcached_response(instance, (char*)value, sizeof(*value), NULL);
 136 }
 137
 138 memcached_return_t memcached_increment(memcached_st *ptr,
 139                                        const char *key, size_t key_length,
 140                                        uint32_t offset,
 141                                        uint64_t *value)
 142 {
 143   return memcached_increment_by_key(ptr, key, key_length, key, key_length, offset, value);
 144 }
 145
 146 memcached_return_t memcached_decrement(memcached_st *ptr,
 147                                        const char *key, size_t key_length,
 148                                        uint32_t offset,
 149                                        uint64_t *value)
 150 {
 151   return memcached_decrement_by_key(ptr, key, key_length, key, key_length, offset, value);
 152 }
 153
 154 memcached_return_t memcached_increment_by_key(memcached_st *ptr,
 155                                               const char *master_key, size_t master_key_length,
 156                                               const char *key, size_t key_length,
 157                                               uint64_t offset,
 158                                               uint64_t *value)
 159 {
 160   memcached_return_t rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol);
 161   unlikely (rc != MEMCACHED_SUCCESS)
 162     return rc;
 163
 164   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 165   if (ptr->flags.binary_protocol)
 166   {
 167     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 168                          master_key, master_key_length, key, key_length,
 169                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 170                          value);
 171   }
 172   else
 173   {
 174      rc= text_incr_decr(ptr, "incr", master_key, master_key_length, key, key_length, offset, value);
 175   }
 176
 177   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 178
 179   return rc;
 180 }
 181
 182 memcached_return_t memcached_decrement_by_key(memcached_st *ptr,
 183                                               const char *master_key, size_t master_key_length,
 184                                               const char *key, size_t key_length,
 185                                               uint64_t offset,
 186                                               uint64_t *value)
 187 {
 188   memcached_return_t rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol);
 189   unlikely (rc != MEMCACHED_SUCCESS)
 190     return rc;
 191
 192   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 193   if (ptr->flags.binary_protocol)
 194   {
 195     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 196                          master_key, master_key_length, key, key_length,
 197                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 198                          value);
 199   }
 200   else
 201   {
 202     rc= text_incr_decr(ptr, "decr", master_key, master_key_length, key, key_length, offset, value);
 203   }
 204
 205   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 206
 207   return rc;
 208 }
 209
 210 memcached_return_t memcached_increment_with_initial(memcached_st *ptr,
 211                                                     const char *key,
 212                                                     size_t key_length,
 213                                                     uint64_t offset,
 214                                                     uint64_t initial,
 215                                                     time_t expiration,
 216                                                     uint64_t *value)
 217 {
 218   return memcached_increment_with_initial_by_key(ptr, key, key_length,
 219                                                  key, key_length,
 220                                                  offset, initial, expiration, value);
 221 }
 222
 223 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *ptr,
 224                                                          const char *master_key,
 225                                                          size_t master_key_length,
 226                                                          const char *key,
 227                                                          size_t key_length,
 228                                                          uint64_t offset,
 229                                                          uint64_t initial,
 230                                                          time_t expiration,
 231                                                          uint64_t *value)
 232 {
 233   memcached_return_t rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol);
 234   unlikely (rc != MEMCACHED_SUCCESS)
 235     return rc;
 236
 237   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 238   if (ptr->flags.binary_protocol)
 239     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 240                          master_key, master_key_length, key, key_length,
 241                          offset, initial, (uint32_t)expiration,
 242                          value);
 243   else
 244     rc= MEMCACHED_PROTOCOL_ERROR;
 245
 246   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 247
 248   return rc;
 249 }
 250
 251 memcached_return_t memcached_decrement_with_initial(memcached_st *ptr,
 252                                                     const char *key,
 253                                                     size_t key_length,
 254                                                     uint64_t offset,
 255                                                     uint64_t initial,
 256                                                     time_t expiration,
 257                                                     uint64_t *value)
 258 {
 259   return memcached_decrement_with_initial_by_key(ptr, key, key_length,
 260                                                  key, key_length,
 261                                                  offset, initial, expiration, value);
 262 }
 263
 264 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *ptr,
 265                                                            const char *master_key,
 266                                                            size_t master_key_length,
 267                                                            const char *key,
 268                                                            size_t key_length,
 269                                                            uint64_t offset,
 270                                                            uint64_t initial,
 271                                                            time_t expiration,
 272                                                            uint64_t *value)
 273 {
 274   memcached_return_t rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol);
 275   unlikely (rc != MEMCACHED_SUCCESS)
 276     return rc;
 277
 278   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 279   if (ptr->flags.binary_protocol)
 280   {
 281     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 282                          master_key, master_key_length, key, key_length,
 283                          offset, initial, (uint32_t)expiration,
 284                          value);
 285   }
 286   else
 287   {
 288     rc= MEMCACHED_PROTOCOL_ERROR;
 289   }
 290
 291   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 292
 293   return rc;
 294 }
 295