git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/storage.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: Storage related functions, aka set, replace,..
   9  *
  10  */
  11
  12 #include "common.h"
  13
  14 typedef enum {
  15   SET_OP,
  16   REPLACE_OP,
  17   ADD_OP,
  18   PREPEND_OP,
  19   APPEND_OP,
  20   CAS_OP,
  21 } memcached_storage_action_t;
  22
  23 /* Inline this */
  24 static inline const char *storage_op_string(memcached_storage_action_t verb)
  25 {
  26   switch (verb)
  27   {
  28   case SET_OP:
  29     return "set ";
  30   case REPLACE_OP:
  31     return "replace ";
  32   case ADD_OP:
  33     return "add ";
  34   case PREPEND_OP:
  35     return "prepend ";
  36   case APPEND_OP:
  37     return "append ";
  38   case CAS_OP:
  39     return "cas ";
  40   default:
  41     return "tosserror"; /* This is impossible, fixes issue for compiler warning in VisualStudio */
  42   }
  43
  44   /* NOTREACHED */
  45 }
  46
  47 static memcached_return_t memcached_send_binary(memcached_st *ptr,
  48                                                 const char *master_key,
  49                                                 size_t master_key_length,
  50                                                 const char *key,
  51                                                 size_t key_length,
  52                                                 const char *value,
  53                                                 size_t value_length,
  54                                                 time_t expiration,
  55                                                 uint32_t flags,
  56                                                 uint64_t cas,
  57                                                 memcached_storage_action_t verb);
  58
  59 static inline memcached_return_t memcached_send(memcached_st *ptr,
  60                                                 const char *master_key, size_t master_key_length,
  61                                                 const char *key, size_t key_length,
  62                                                 const char *value, size_t value_length,
  63                                                 time_t expiration,
  64                                                 uint32_t flags,
  65                                                 uint64_t cas,
  66                                                 memcached_storage_action_t verb)
  67 {
  68   bool to_write;
  69   size_t write_length;
  70   memcached_return_t rc;
  71   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  72   uint32_t server_key;
  73   memcached_server_write_instance_st instance;
  74
  75   WATCHPOINT_ASSERT(!(value == NULL && value_length > 0));
  76
  77   rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol);
  78   unlikely (rc != MEMCACHED_SUCCESS)
  79     return rc;
  80
  81   unlikely (memcached_server_count(ptr) == 0)
  82     return MEMCACHED_NO_SERVERS;
  83
  84   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  85     return MEMCACHED_BAD_KEY_PROVIDED;
  86
  87   if (ptr->flags.binary_protocol)
  88   {
  89     return memcached_send_binary(ptr, master_key, master_key_length,
  90                                  key, key_length,
  91                                  value, value_length, expiration,
  92                                  flags, cas, verb);
  93   }
  94
  95   server_key= memcached_generate_hash_with_redistribution(ptr, master_key, master_key_length);
  96   instance= memcached_server_instance_fetch(ptr, server_key);
  97
  98   if (cas)
  99   {
 100     write_length= (size_t) snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
 101                                     "%s %.*s%.*s %u %llu %zu %llu%s\r\n",
 102                                     storage_op_string(verb),
 103                                     (int)ptr->prefix_key_length,
 104                                     ptr->prefix_key,
 105                                     (int)key_length, key, flags,
 106                                     (unsigned long long)expiration, value_length,
 107                                     (unsigned long long)cas,
 108                                     (ptr->flags.no_reply) ? " noreply" : "");
 109   }
 110   else
 111   {
 112     char *buffer_ptr= buffer;
 113     const char *command= storage_op_string(verb);
 114
 115     /* Copy in the command, no space needed, we handle that in the command function*/
 116     memcpy(buffer_ptr, command, strlen(command));
 117
 118     /* Copy in the key prefix, switch to the buffer_ptr */
 119     buffer_ptr= memcpy((buffer_ptr + strlen(command)), ptr->prefix_key, ptr->prefix_key_length);
 120
 121     /* Copy in the key, adjust point if a key prefix was used. */
 122     buffer_ptr= memcpy(buffer_ptr + (ptr->prefix_key_length ? ptr->prefix_key_length : 0),
 123                        key, key_length);
 124     buffer_ptr+= key_length;
 125     buffer_ptr[0]=  ' ';
 126     buffer_ptr++;
 127
 128     write_length= (size_t)(buffer_ptr - buffer);
 129     write_length+= (size_t) snprintf(buffer_ptr, MEMCACHED_DEFAULT_COMMAND_SIZE,
 130                                      "%u %llu %zu%s\r\n",
 131                                      flags,
 132                                      (unsigned long long)expiration, value_length,
 133                                      ptr->flags.no_reply ? " noreply" : "");
 134   }
 135
 136   if (ptr->flags.use_udp && ptr->flags.buffer_requests)
 137   {
 138     size_t cmd_size= write_length + value_length + 2;
 139     if (cmd_size > MAX_UDP_DATAGRAM_LENGTH - UDP_DATAGRAM_HEADER_LENGTH)
 140       return MEMCACHED_WRITE_FAILURE;
 141     if (cmd_size + instance->write_buffer_offset > MAX_UDP_DATAGRAM_LENGTH)
 142       memcached_io_write(instance, NULL, 0, true);
 143   }
 144
 145   if (write_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
 146   {
 147     rc= MEMCACHED_WRITE_FAILURE;
 148     goto error;
 149   }
 150
 151   /* Send command header */
 152   rc=  memcached_do(instance, buffer, write_length, false);
 153   if (rc != MEMCACHED_SUCCESS)
 154     goto error;
 155
 156   /* Send command body */
 157   if (memcached_io_write(instance, value, value_length, false) == -1)
 158   {
 159     rc= MEMCACHED_WRITE_FAILURE;
 160     goto error;
 161   }
 162
 163   if (ptr->flags.buffer_requests && verb == SET_OP)
 164   {
 165     to_write= false;
 166   }
 167   else
 168   {
 169     to_write= true;
 170   }
 171
 172   if (memcached_io_write(instance, "\r\n", 2, to_write) == -1)
 173   {
 174     rc= MEMCACHED_WRITE_FAILURE;
 175     goto error;
 176   }
 177
 178   if (ptr->flags.no_reply)
 179     return (to_write == false) ? MEMCACHED_BUFFERED : MEMCACHED_SUCCESS;
 180
 181   if (to_write == false)
 182     return MEMCACHED_BUFFERED;
 183
 184   rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
 185
 186   if (rc == MEMCACHED_STORED)
 187     return MEMCACHED_SUCCESS;
 188   else
 189     return rc;
 190
 191 error:
 192   memcached_io_reset(instance);
 193
 194   return rc;
 195 }
 196
 197
 198 memcached_return_t memcached_set(memcached_st *ptr, const char *key, size_t key_length,
 199                                  const char *value, size_t value_length,
 200                                  time_t expiration,
 201                                  uint32_t flags)
 202 {
 203   memcached_return_t rc;
 204   LIBMEMCACHED_MEMCACHED_SET_START();
 205   rc= memcached_send(ptr, key, key_length,
 206                      key, key_length, value, value_length,
 207                      expiration, flags, 0, SET_OP);
 208   LIBMEMCACHED_MEMCACHED_SET_END();
 209   return rc;
 210 }
 211
 212 memcached_return_t memcached_add(memcached_st *ptr,
 213                                  const char *key, size_t key_length,
 214                                  const char *value, size_t value_length,
 215                                  time_t expiration,
 216                                  uint32_t flags)
 217 {
 218   memcached_return_t rc;
 219   LIBMEMCACHED_MEMCACHED_ADD_START();
 220   rc= memcached_send(ptr, key, key_length,
 221                      key, key_length, value, value_length,
 222                      expiration, flags, 0, ADD_OP);
 223   LIBMEMCACHED_MEMCACHED_ADD_END();
 224   return rc;
 225 }
 226
 227 memcached_return_t memcached_replace(memcached_st *ptr,
 228                                      const char *key, size_t key_length,
 229                                      const char *value, size_t value_length,
 230                                      time_t expiration,
 231                                      uint32_t flags)
 232 {
 233   memcached_return_t rc;
 234   LIBMEMCACHED_MEMCACHED_REPLACE_START();
 235   rc= memcached_send(ptr, key, key_length,
 236                      key, key_length, value, value_length,
 237                      expiration, flags, 0, REPLACE_OP);
 238   LIBMEMCACHED_MEMCACHED_REPLACE_END();
 239   return rc;
 240 }
 241
 242 memcached_return_t memcached_prepend(memcached_st *ptr,
 243                                      const char *key, size_t key_length,
 244                                      const char *value, size_t value_length,
 245                                      time_t expiration,
 246                                      uint32_t flags)
 247 {
 248   memcached_return_t rc;
 249   rc= memcached_send(ptr, key, key_length,
 250                      key, key_length, value, value_length,
 251                      expiration, flags, 0, PREPEND_OP);
 252   return rc;
 253 }
 254
 255 memcached_return_t memcached_append(memcached_st *ptr,
 256                                     const char *key, size_t key_length,
 257                                     const char *value, size_t value_length,
 258                                     time_t expiration,
 259                                     uint32_t flags)
 260 {
 261   memcached_return_t rc;
 262   rc= memcached_send(ptr, key, key_length,
 263                      key, key_length, value, value_length,
 264                      expiration, flags, 0, APPEND_OP);
 265   return rc;
 266 }
 267
 268 memcached_return_t memcached_cas(memcached_st *ptr,
 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                                  uint64_t cas)
 274 {
 275   memcached_return_t rc;
 276   rc= memcached_send(ptr, key, key_length,
 277                      key, key_length, value, value_length,
 278                      expiration, flags, cas, CAS_OP);
 279   return rc;
 280 }
 281
 282 memcached_return_t memcached_set_by_key(memcached_st *ptr,
 283                                         const char *master_key __attribute__((unused)),
 284                                         size_t master_key_length __attribute__((unused)),
 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_t rc;
 291   LIBMEMCACHED_MEMCACHED_SET_START();
 292   rc= memcached_send(ptr, master_key, master_key_length,
 293                      key, key_length, value, value_length,
 294                      expiration, flags, 0, SET_OP);
 295   LIBMEMCACHED_MEMCACHED_SET_END();
 296   return rc;
 297 }
 298
 299 memcached_return_t memcached_add_by_key(memcached_st *ptr,
 300                                         const char *master_key, size_t master_key_length,
 301                                         const char *key, size_t key_length,
 302                                         const char *value, size_t value_length,
 303                                         time_t expiration,
 304                                         uint32_t flags)
 305 {
 306   memcached_return_t rc;
 307   LIBMEMCACHED_MEMCACHED_ADD_START();
 308   rc= memcached_send(ptr, master_key, master_key_length,
 309                      key, key_length, value, value_length,
 310                      expiration, flags, 0, ADD_OP);
 311   LIBMEMCACHED_MEMCACHED_ADD_END();
 312   return rc;
 313 }
 314
 315 memcached_return_t memcached_replace_by_key(memcached_st *ptr,
 316                                             const char *master_key, size_t master_key_length,
 317                                             const char *key, size_t key_length,
 318                                             const char *value, size_t value_length,
 319                                             time_t expiration,
 320                                             uint32_t flags)
 321 {
 322   memcached_return_t rc;
 323   LIBMEMCACHED_MEMCACHED_REPLACE_START();
 324   rc= memcached_send(ptr, master_key, master_key_length,
 325                      key, key_length, value, value_length,
 326                      expiration, flags, 0, REPLACE_OP);
 327   LIBMEMCACHED_MEMCACHED_REPLACE_END();
 328   return rc;
 329 }
 330
 331 memcached_return_t memcached_prepend_by_key(memcached_st *ptr,
 332                                             const char *master_key, size_t master_key_length,
 333                                             const char *key, size_t key_length,
 334                                             const char *value, size_t value_length,
 335                                             time_t expiration,
 336                                             uint32_t flags)
 337 {
 338   memcached_return_t rc;
 339   rc= memcached_send(ptr, master_key, master_key_length,
 340                      key, key_length, value, value_length,
 341                      expiration, flags, 0, PREPEND_OP);
 342   return rc;
 343 }
 344
 345 memcached_return_t memcached_append_by_key(memcached_st *ptr,
 346                                            const char *master_key, size_t master_key_length,
 347                                            const char *key, size_t key_length,
 348                                            const char *value, size_t value_length,
 349                                            time_t expiration,
 350                                            uint32_t flags)
 351 {
 352   memcached_return_t rc;
 353   rc= memcached_send(ptr, master_key, master_key_length,
 354                      key, key_length, value, value_length,
 355                      expiration, flags, 0, APPEND_OP);
 356   return rc;
 357 }
 358
 359 memcached_return_t memcached_cas_by_key(memcached_st *ptr,
 360                                         const char *master_key, size_t master_key_length,
 361                                         const char *key, size_t key_length,
 362                                         const char *value, size_t value_length,
 363                                         time_t expiration,
 364                                         uint32_t flags,
 365                                         uint64_t cas)
 366 {
 367   memcached_return_t rc;
 368   rc= memcached_send(ptr, master_key, master_key_length,
 369                      key, key_length, value, value_length,
 370                      expiration, flags, cas, CAS_OP);
 371   return rc;
 372 }
 373
 374 static inline uint8_t get_com_code(memcached_storage_action_t verb, bool noreply)
 375 {
 376   /* 0 isn't a value we want, but GCC 4.2 seems to think ret can otherwise
 377    * be used uninitialized in this function. FAIL */
 378   uint8_t ret= 0;
 379
 380   if (noreply)
 381     switch (verb)
 382     {
 383     case SET_OP:
 384       ret=PROTOCOL_BINARY_CMD_SETQ;
 385       break;
 386     case ADD_OP:
 387       ret=PROTOCOL_BINARY_CMD_ADDQ;
 388       break;
 389     case CAS_OP: /* FALLTHROUGH */
 390     case REPLACE_OP:
 391       ret=PROTOCOL_BINARY_CMD_REPLACEQ;
 392       break;
 393     case APPEND_OP:
 394       ret=PROTOCOL_BINARY_CMD_APPENDQ;
 395       break;
 396     case PREPEND_OP:
 397       ret=PROTOCOL_BINARY_CMD_PREPENDQ;
 398       break;
 399     default:
 400       WATCHPOINT_ASSERT(verb);
 401       break;
 402     }
 403   else
 404     switch (verb)
 405     {
 406     case SET_OP:
 407       ret=PROTOCOL_BINARY_CMD_SET;
 408       break;
 409     case ADD_OP:
 410       ret=PROTOCOL_BINARY_CMD_ADD;
 411       break;
 412     case CAS_OP: /* FALLTHROUGH */
 413     case REPLACE_OP:
 414       ret=PROTOCOL_BINARY_CMD_REPLACE;
 415       break;
 416     case APPEND_OP:
 417       ret=PROTOCOL_BINARY_CMD_APPEND;
 418       break;
 419     case PREPEND_OP:
 420       ret=PROTOCOL_BINARY_CMD_PREPEND;
 421       break;
 422     default:
 423       WATCHPOINT_ASSERT(verb);
 424       break;
 425     }
 426
 427   return ret;
 428 }
 429
 430
 431
 432 static memcached_return_t memcached_send_binary(memcached_st *ptr,
 433                                                 const char *master_key,
 434                                                 size_t master_key_length,
 435                                                 const char *key,
 436                                                 size_t key_length,
 437                                                 const char *value,
 438                                                 size_t value_length,
 439                                                 time_t expiration,
 440                                                 uint32_t flags,
 441                                                 uint64_t cas,
 442                                                 memcached_storage_action_t verb)
 443 {
 444   bool flush;
 445   protocol_binary_request_set request= {.bytes= {0}};
 446   size_t send_length= sizeof(request.bytes);
 447   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, master_key,
 448                                                                    master_key_length);
 449
 450   memcached_server_write_instance_st server=
 451     memcached_server_instance_fetch(ptr, server_key);
 452
 453   bool noreply= server->root->flags.no_reply;
 454
 455   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 456   request.message.header.request.opcode= get_com_code(verb, noreply);
 457   request.message.header.request.keylen= htons((uint16_t)key_length);
 458   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 459   if (verb == APPEND_OP || verb == PREPEND_OP)
 460     send_length -= 8; /* append & prepend does not contain extras! */
 461   else
 462   {
 463     request.message.header.request.extlen= 8;
 464     request.message.body.flags= htonl(flags);
 465     request.message.body.expiration= htonl((uint32_t)expiration);
 466   }
 467
 468   request.message.header.request.bodylen= htonl((uint32_t) (key_length + value_length +
 469                                                             request.message.header.request.extlen));
 470
 471   if (cas)
 472     request.message.header.request.cas= htonll(cas);
 473
 474   flush= (bool) ((server->root->flags.buffer_requests && verb == SET_OP) ? 0 : 1);
 475
 476   if (server->root->flags.use_udp && ! flush)
 477   {
 478     size_t cmd_size= send_length + key_length + value_length;
 479
 480     if (cmd_size > MAX_UDP_DATAGRAM_LENGTH - UDP_DATAGRAM_HEADER_LENGTH)
 481     {
 482       return MEMCACHED_WRITE_FAILURE;
 483     }
 484     if (cmd_size + server->write_buffer_offset > MAX_UDP_DATAGRAM_LENGTH)
 485     {
 486       memcached_io_write(server, NULL, 0, true);
 487     }
 488   }
 489
 490   /* write the header */
 491   if ((memcached_do(server, (const char*)request.bytes, send_length, false) != MEMCACHED_SUCCESS) ||
 492       (memcached_io_write(server, key, key_length, false) == -1) ||
 493       (memcached_io_write(server, value, value_length, flush) == -1))
 494   {
 495     memcached_io_reset(server);
 496     return MEMCACHED_WRITE_FAILURE;
 497   }
 498
 499   unlikely (verb == SET_OP && ptr->number_of_replicas > 0)
 500   {
 501     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_SETQ;
 502
 503     for (uint32_t x= 0; x < ptr->number_of_replicas; x++)
 504     {
 505       memcached_server_write_instance_st instance;
 506
 507       ++server_key;
 508       if (server_key == memcached_server_count(ptr))
 509         server_key= 0;
 510
 511       instance= memcached_server_instance_fetch(ptr, server_key);
 512
 513       if ((memcached_do(instance, (const char*)request.bytes,
 514                         send_length, false) != MEMCACHED_SUCCESS) ||
 515           (memcached_io_write(instance, key, key_length, false) == -1) ||
 516           (memcached_io_write(instance, value, value_length, flush) == -1))
 517       {
 518         memcached_io_reset(instance);
 519       }
 520       else
 521       {
 522         memcached_server_response_decrement(instance);
 523       }
 524     }
 525   }
 526
 527   if (flush == false)
 528   {
 529     return MEMCACHED_BUFFERED;
 530   }
 531
 532   if (noreply)
 533   {
 534     return MEMCACHED_SUCCESS;
 535   }
 536
 537   return memcached_response(server, NULL, 0, NULL);
 538 }
 539