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

   1 /*
   2   Memcached library
   3
   4   memcached_set()
   5   memcached_replace()
   6   memcached_add()
   7
   8 */
   9 #include "common.h"
  10 #include "memcached_io.h"
  11
  12 typedef enum {
  13   SET_OP,
  14   REPLACE_OP,
  15   ADD_OP,
  16   PREPEND_OP,
  17   APPEND_OP,
  18   CAS_OP,
  19 } memcached_storage_action;
  20
  21 /* Inline this */
  22 static char *storage_op_string(memcached_storage_action verb)
  23 {
  24   switch (verb)
  25   {
  26   case SET_OP:
  27     return "set";
  28   case REPLACE_OP:
  29     return "replace";
  30   case ADD_OP:
  31     return "add";
  32   case PREPEND_OP:
  33     return "prepend";
  34   case APPEND_OP:
  35     return "append";
  36   case CAS_OP:
  37     return "cas";
  38   default:
  39     return "tosserror"; /* This is impossible, fixes issue for compiler warning in VisualStudio */
  40   };
  41
  42   return SET_OP;
  43 }
  44
  45 static memcached_return memcached_send_binary(memcached_server_st* server,
  46                                               const char *key,
  47                                               size_t key_length,
  48                                               const char *value,
  49                                               size_t value_length,
  50                                               time_t expiration,
  51                                               uint32_t flags,
  52                                               uint64_t cas,
  53                                               memcached_storage_action verb);
  54
  55 static inline memcached_return memcached_send(memcached_st *ptr,
  56                                               const char *master_key, size_t master_key_length,
  57                                               const char *key, size_t key_length,
  58                                               const char *value, size_t value_length,
  59                                               time_t expiration,
  60                                               uint32_t flags,
  61                                               uint64_t cas,
  62                                               memcached_storage_action verb)
  63 {
  64   char to_write;
  65   size_t write_length;
  66   ssize_t sent_length;
  67   memcached_return rc;
  68   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  69   unsigned int server_key;
  70
  71   WATCHPOINT_ASSERT(!(value == NULL && value_length > 0));
  72
  73   rc= memcached_validate_key_length(key_length, ptr->flags & MEM_BINARY_PROTOCOL);
  74   unlikely (rc != MEMCACHED_SUCCESS)
  75     return rc;
  76
  77   unlikely (ptr->number_of_hosts == 0)
  78     return MEMCACHED_NO_SERVERS;
  79
  80   if ((ptr->flags & MEM_VERIFY_KEY) && (memcachd_key_test((char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  81     return MEMCACHED_BAD_KEY_PROVIDED;
  82
  83   server_key= memcached_generate_hash(ptr, master_key, master_key_length);
  84
  85   if (ptr->flags & MEM_BINARY_PROTOCOL)
  86     return memcached_send_binary(&ptr->hosts[server_key], key, key_length,
  87                                  value, value_length, expiration,
  88                                  flags, cas, verb);
  89
  90   if (cas)
  91     write_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  92                            "%s %s%.*s %u %llu %zu %llu\r\n", storage_op_string(verb),
  93                            ptr->prefix_key,
  94                            (int)key_length, key, flags,
  95                            (unsigned long long)expiration, value_length,
  96                            (unsigned long long)cas);
  97   else
  98     write_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  99                            "%s %s%.*s %u %llu %zu\r\n", storage_op_string(verb),
 100                            ptr->prefix_key,
 101                            (int)key_length, key, flags,
 102                            (unsigned long long)expiration, value_length);
 103
 104   if (write_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
 105   {
 106     rc= MEMCACHED_WRITE_FAILURE;
 107     goto error;
 108   }
 109
 110   /* Send command header */
 111   rc=  memcached_do(&ptr->hosts[server_key], buffer, write_length, 0);
 112   if (rc != MEMCACHED_SUCCESS)
 113     goto error;
 114
 115   /* Send command body */
 116   if ((sent_length= memcached_io_write(&ptr->hosts[server_key], value, value_length, 0)) == -1)
 117   {
 118     rc= MEMCACHED_WRITE_FAILURE;
 119     goto error;
 120   }
 121
 122   if ((ptr->flags & MEM_BUFFER_REQUESTS) && verb == SET_OP)
 123     to_write= 0;
 124   else
 125     to_write= 1;
 126
 127   if ((sent_length= memcached_io_write(&ptr->hosts[server_key], "\r\n", 2, to_write)) == -1)
 128   {
 129     rc= MEMCACHED_WRITE_FAILURE;
 130     goto error;
 131   }
 132
 133   if (to_write == 0)
 134     return MEMCACHED_BUFFERED;
 135
 136   rc= memcached_response(&ptr->hosts[server_key], buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
 137
 138   if (rc == MEMCACHED_STORED)
 139     return MEMCACHED_SUCCESS;
 140   else
 141     return rc;
 142
 143 error:
 144   memcached_io_reset(&ptr->hosts[server_key]);
 145
 146   return rc;
 147 }
 148
 149
 150 memcached_return memcached_set(memcached_st *ptr, const char *key, size_t key_length,
 151                                const char *value, size_t value_length,
 152                                time_t expiration,
 153                                uint32_t flags)
 154 {
 155   memcached_return rc;
 156   LIBMEMCACHED_MEMCACHED_SET_START();
 157   rc= memcached_send(ptr, key, key_length,
 158                      key, key_length, value, value_length,
 159                      expiration, flags, 0, SET_OP);
 160   LIBMEMCACHED_MEMCACHED_SET_END();
 161   return rc;
 162 }
 163
 164 memcached_return memcached_add(memcached_st *ptr,
 165                                const char *key, size_t key_length,
 166                                const char *value, size_t value_length,
 167                                time_t expiration,
 168                                uint32_t flags)
 169 {
 170   memcached_return rc;
 171   LIBMEMCACHED_MEMCACHED_ADD_START();
 172   rc= memcached_send(ptr, key, key_length,
 173                      key, key_length, value, value_length,
 174                      expiration, flags, 0, ADD_OP);
 175   LIBMEMCACHED_MEMCACHED_ADD_END();
 176   return rc;
 177 }
 178
 179 memcached_return memcached_replace(memcached_st *ptr,
 180                                    const char *key, size_t key_length,
 181                                    const char *value, size_t value_length,
 182                                    time_t expiration,
 183                                    uint32_t flags)
 184 {
 185   memcached_return rc;
 186   LIBMEMCACHED_MEMCACHED_REPLACE_START();
 187   rc= memcached_send(ptr, key, key_length,
 188                      key, key_length, value, value_length,
 189                      expiration, flags, 0, REPLACE_OP);
 190   LIBMEMCACHED_MEMCACHED_REPLACE_END();
 191   return rc;
 192 }
 193
 194 memcached_return memcached_prepend(memcached_st *ptr,
 195                                    const char *key, size_t key_length,
 196                                    const char *value, size_t value_length,
 197                                    time_t expiration,
 198                                    uint32_t flags)
 199 {
 200   memcached_return rc;
 201   rc= memcached_send(ptr, key, key_length,
 202                      key, key_length, value, value_length,
 203                      expiration, flags, 0, PREPEND_OP);
 204   return rc;
 205 }
 206
 207 memcached_return memcached_append(memcached_st *ptr,
 208                                   const char *key, size_t key_length,
 209                                   const char *value, size_t value_length,
 210                                   time_t expiration,
 211                                   uint32_t flags)
 212 {
 213   memcached_return rc;
 214   rc= memcached_send(ptr, key, key_length,
 215                      key, key_length, value, value_length,
 216                      expiration, flags, 0, APPEND_OP);
 217   return rc;
 218 }
 219
 220 memcached_return memcached_cas(memcached_st *ptr,
 221                                const char *key, size_t key_length,
 222                                const char *value, size_t value_length,
 223                                time_t expiration,
 224                                uint32_t flags,
 225                                uint64_t cas)
 226 {
 227   memcached_return rc;
 228   rc= memcached_send(ptr, key, key_length,
 229                      key, key_length, value, value_length,
 230                      expiration, flags, cas, CAS_OP);
 231   return rc;
 232 }
 233
 234 memcached_return memcached_set_by_key(memcached_st *ptr,
 235                                       const char *master_key __attribute__((unused)),
 236                                       size_t master_key_length __attribute__((unused)),
 237                                       const char *key, size_t key_length,
 238                                       const char *value, size_t value_length,
 239                                       time_t expiration,
 240                                       uint32_t flags)
 241 {
 242   memcached_return rc;
 243   LIBMEMCACHED_MEMCACHED_SET_START();
 244   rc= memcached_send(ptr, master_key, master_key_length,
 245                      key, key_length, value, value_length,
 246                      expiration, flags, 0, SET_OP);
 247   LIBMEMCACHED_MEMCACHED_SET_END();
 248   return rc;
 249 }
 250
 251 memcached_return memcached_add_by_key(memcached_st *ptr,
 252                                       const char *master_key, size_t master_key_length,
 253                                       const char *key, size_t key_length,
 254                                       const char *value, size_t value_length,
 255                                       time_t expiration,
 256                                       uint32_t flags)
 257 {
 258   memcached_return rc;
 259   LIBMEMCACHED_MEMCACHED_ADD_START();
 260   rc= memcached_send(ptr, master_key, master_key_length,
 261                      key, key_length, value, value_length,
 262                      expiration, flags, 0, ADD_OP);
 263   LIBMEMCACHED_MEMCACHED_ADD_END();
 264   return rc;
 265 }
 266
 267 memcached_return memcached_replace_by_key(memcached_st *ptr,
 268                                           const char *master_key, size_t master_key_length,
 269                                           const char *key, size_t key_length,
 270                                           const char *value, size_t value_length,
 271                                           time_t expiration,
 272                                           uint32_t flags)
 273 {
 274   memcached_return rc;
 275   LIBMEMCACHED_MEMCACHED_REPLACE_START();
 276   rc= memcached_send(ptr, master_key, master_key_length,
 277                      key, key_length, value, value_length,
 278                      expiration, flags, 0, REPLACE_OP);
 279   LIBMEMCACHED_MEMCACHED_REPLACE_END();
 280   return rc;
 281 }
 282
 283 memcached_return memcached_prepend_by_key(memcached_st *ptr,
 284                                           const char *master_key, size_t master_key_length,
 285                                           const char *key, size_t key_length,
 286                                           const char *value, size_t value_length,
 287                                           time_t expiration,
 288                                           uint32_t flags)
 289 {
 290   memcached_return rc;
 291   rc= memcached_send(ptr, master_key, master_key_length,
 292                      key, key_length, value, value_length,
 293                      expiration, flags, 0, PREPEND_OP);
 294   return rc;
 295 }
 296
 297 memcached_return memcached_append_by_key(memcached_st *ptr,
 298                                          const char *master_key, size_t master_key_length,
 299                                          const char *key, size_t key_length,
 300                                          const char *value, size_t value_length,
 301                                          time_t expiration,
 302                                          uint32_t flags)
 303 {
 304   memcached_return rc;
 305   rc= memcached_send(ptr, master_key, master_key_length,
 306                      key, key_length, value, value_length,
 307                      expiration, flags, 0, APPEND_OP);
 308   return rc;
 309 }
 310
 311 memcached_return memcached_cas_by_key(memcached_st *ptr,
 312                                       const char *master_key, size_t master_key_length,
 313                                       const char *key, size_t key_length,
 314                                       const char *value, size_t value_length,
 315                                       time_t expiration,
 316                                       uint32_t flags,
 317                                       uint64_t cas)
 318 {
 319   memcached_return rc;
 320   rc= memcached_send(ptr, master_key, master_key_length,
 321                      key, key_length, value, value_length,
 322                      expiration, flags, cas, CAS_OP);
 323   return rc;
 324 }
 325
 326 static memcached_return memcached_send_binary(memcached_server_st* server,
 327                                               const char *key,
 328                                               size_t key_length,
 329                                               const char *value,
 330                                               size_t value_length,
 331                                               time_t expiration,
 332                                               uint32_t flags,
 333                                               uint64_t cas,
 334                                               memcached_storage_action verb)
 335 {
 336   char flush;
 337   protocol_binary_request_set request= {.bytes= {0}};
 338   size_t send_length= sizeof(request.bytes);
 339
 340   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 341   switch (verb)
 342   {
 343   case SET_OP:
 344     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_SET;
 345     break;
 346   case ADD_OP:
 347     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_ADD;
 348     break;
 349   case REPLACE_OP:
 350     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_REPLACE;
 351     break;
 352   case APPEND_OP:
 353     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_APPEND;
 354     break;
 355   case PREPEND_OP:
 356     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_PREPEND;
 357     break;
 358   case CAS_OP:
 359     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_REPLACE;
 360       break;
 361   }
 362
 363   request.message.header.request.keylen= htons((uint16_t)key_length);
 364   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 365   if (verb == APPEND_OP || verb == PREPEND_OP)
 366     send_length -= 8; /* append & prepend does not contain extras! */
 367   else
 368   {
 369     request.message.header.request.extlen= 8;
 370     request.message.body.flags= htonl(flags);
 371     request.message.body.expiration= htonl((uint32_t)expiration);
 372   }
 373
 374   request.message.header.request.bodylen= htonl(key_length + value_length +
 375                                                 request.message.header.request.extlen);
 376
 377   if (cas)
 378     request.message.header.request.cas= htonll(cas);
 379
 380   flush= ((server->root->flags & MEM_BUFFER_REQUESTS) && verb == SET_OP) ? 0 : 1;
 381   /* write the header */
 382   if ((memcached_do(server, (const char*)request.bytes, send_length, 0) != MEMCACHED_SUCCESS) ||
 383       (memcached_io_write(server, key, key_length, 0) == -1) ||
 384       (memcached_io_write(server, value, value_length, flush) == -1))
 385   {
 386     memcached_io_reset(server);
 387     return MEMCACHED_WRITE_FAILURE;
 388   }
 389
 390   if (flush == 0)
 391     return MEMCACHED_BUFFERED;
 392
 393   return memcached_response(server, NULL, 0, NULL);
 394 }
 395