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   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached library
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2006-2009 Brian Aker All rights reserved.
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions are
  10  *  met:
  11  *
  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
  14  *
  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
  18  *  distribution.
  19  *
  20  *      * The names of its contributors may not be used to endorse or
  21  *  promote products derived from this software without specific prior
  22  *  written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  */
  37
  38
  39 #include <libmemcached/common.h>
  40
  41 enum memcached_storage_action_t {
  42   SET_OP,
  43   REPLACE_OP,
  44   ADD_OP,
  45   PREPEND_OP,
  46   APPEND_OP,
  47   CAS_OP
  48 };
  49
  50 /* Inline this */
  51 static inline const char *storage_op_string(memcached_storage_action_t verb)
  52 {
  53   switch (verb)
  54   {
  55   case REPLACE_OP:
  56     return "replace ";
  57
  58   case ADD_OP:
  59     return "add ";
  60
  61   case PREPEND_OP:
  62     return "prepend ";
  63
  64   case APPEND_OP:
  65     return "append ";
  66
  67   case CAS_OP:
  68     return "cas ";
  69
  70   case SET_OP:
  71     break;
  72   }
  73
  74   return "set ";
  75 }
  76
  77 static inline uint8_t get_com_code(const memcached_storage_action_t verb, const bool reply)
  78 {
  79   if (reply == false)
  80   {
  81     switch (verb)
  82     {
  83     case SET_OP:
  84       return PROTOCOL_BINARY_CMD_SETQ;
  85
  86     case ADD_OP:
  87       return PROTOCOL_BINARY_CMD_ADDQ;
  88
  89     case CAS_OP: /* FALLTHROUGH */
  90     case REPLACE_OP:
  91       return PROTOCOL_BINARY_CMD_REPLACEQ;
  92
  93     case APPEND_OP:
  94       return PROTOCOL_BINARY_CMD_APPENDQ;
  95
  96     case PREPEND_OP:
  97       return PROTOCOL_BINARY_CMD_PREPENDQ;
  98     }
  99   }
 100
 101   switch (verb)
 102   {
 103   case SET_OP:
 104     break;
 105
 106   case ADD_OP:
 107     return PROTOCOL_BINARY_CMD_ADD;
 108
 109   case CAS_OP: /* FALLTHROUGH */
 110   case REPLACE_OP:
 111     return PROTOCOL_BINARY_CMD_REPLACE;
 112
 113   case APPEND_OP:
 114     return PROTOCOL_BINARY_CMD_APPEND;
 115
 116   case PREPEND_OP:
 117     return PROTOCOL_BINARY_CMD_PREPEND;
 118   }
 119
 120   return PROTOCOL_BINARY_CMD_SET;
 121 }
 122
 123 static memcached_return_t memcached_send_binary(memcached_st *ptr,
 124                                                 memcached_server_write_instance_st server,
 125                                                 uint32_t server_key,
 126                                                 const char *key,
 127                                                 const size_t key_length,
 128                                                 const char *value,
 129                                                 const size_t value_length,
 130                                                 const time_t expiration,
 131                                                 const uint32_t flags,
 132                                                 const uint64_t cas,
 133                                                 const bool flush,
 134                                                 const bool reply,
 135                                                 memcached_storage_action_t verb)
 136 {
 137   protocol_binary_request_set request= {};
 138   size_t send_length= sizeof(request.bytes);
 139
 140   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 141   request.message.header.request.opcode= get_com_code(verb, reply);
 142   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(ptr->_namespace)));
 143   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 144   if (verb == APPEND_OP or verb == PREPEND_OP)
 145   {
 146     send_length -= 8; /* append & prepend does not contain extras! */
 147   }
 148   else
 149   {
 150     request.message.header.request.extlen= 8;
 151     request.message.body.flags= htonl(flags);
 152     request.message.body.expiration= htonl((uint32_t)expiration);
 153   }
 154
 155   request.message.header.request.bodylen= htonl((uint32_t) (key_length + memcached_array_size(ptr->_namespace) + value_length +
 156                                                             request.message.header.request.extlen));
 157
 158   if (cas)
 159   {
 160     request.message.header.request.cas= memcached_htonll(cas);
 161   }
 162
 163   libmemcached_io_vector_st vector[]=
 164   {
 165     { NULL, 0 },
 166     { request.bytes, send_length },
 167     { memcached_array_string(ptr->_namespace),  memcached_array_size(ptr->_namespace) },
 168     { key, key_length },
 169     { value, value_length }
 170   };
 171
 172   /* write the header */
 173   memcached_return_t rc;
 174   if ((rc= memcached_vdo(server, vector, 5, flush)) != MEMCACHED_SUCCESS)
 175   {
 176     memcached_io_reset(server);
 177
 178     if (memcached_has_error(ptr))
 179     {
 180       memcached_set_error(*server, rc, MEMCACHED_AT);
 181     }
 182
 183     return MEMCACHED_WRITE_FAILURE;
 184   }
 185
 186   if (verb == SET_OP and ptr->number_of_replicas > 0)
 187   {
 188     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_SETQ;
 189     WATCHPOINT_STRING("replicating");
 190
 191     for (uint32_t x= 0; x < ptr->number_of_replicas; x++)
 192     {
 193       ++server_key;
 194       if (server_key == memcached_server_count(ptr))
 195       {
 196         server_key= 0;
 197       }
 198
 199       memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 200
 201       if (memcached_vdo(instance, vector, 5, false) != MEMCACHED_SUCCESS)
 202       {
 203         memcached_io_reset(instance);
 204       }
 205       else
 206       {
 207         memcached_server_response_decrement(instance);
 208       }
 209     }
 210   }
 211
 212   if (flush == false)
 213   {
 214     return MEMCACHED_BUFFERED;
 215   }
 216
 217   // No reply always assumes success
 218   if (reply == false)
 219   {
 220     return MEMCACHED_SUCCESS;
 221   }
 222
 223   return memcached_response(server, NULL, 0, NULL);
 224 }
 225
 226 static memcached_return_t memcached_send_ascii(memcached_st *ptr,
 227                                                memcached_server_write_instance_st instance,
 228                                                const char *key,
 229                                                const size_t key_length,
 230                                                const char *value,
 231                                                const size_t value_length,
 232                                                const time_t expiration,
 233                                                const uint32_t flags,
 234                                                const uint64_t cas,
 235                                                const bool flush,
 236                                                const bool reply,
 237                                                const memcached_storage_action_t verb)
 238 {
 239   char flags_buffer[MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH +1];
 240   int flags_buffer_length= snprintf(flags_buffer, sizeof(flags_buffer), " %u", flags);
 241   if (size_t(flags_buffer_length) >= sizeof(flags_buffer) or flags_buffer_length < 0)
 242   {
 243     return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
 244                                memcached_literal_param("snprintf(MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH)"));
 245   }
 246
 247   char expiration_buffer[MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH +1];
 248   int expiration_buffer_length= snprintf(expiration_buffer, sizeof(expiration_buffer), " %llu", (unsigned long long)expiration);
 249   if (size_t(expiration_buffer_length) >= sizeof(expiration_buffer) or expiration_buffer_length < 0)
 250   {
 251     return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
 252                                memcached_literal_param("snprintf(MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH)"));
 253   }
 254
 255   char value_buffer[MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH +1];
 256   int value_buffer_length= snprintf(value_buffer, sizeof(value_buffer), " %llu", (unsigned long long)value_length);
 257   if (size_t(value_buffer_length) >= sizeof(value_buffer) or value_buffer_length < 0)
 258   {
 259     return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
 260                                memcached_literal_param("snprintf(MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH)"));
 261   }
 262
 263   char cas_buffer[MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH +1];
 264   int cas_buffer_length= 0;
 265   if (cas)
 266   {
 267     cas_buffer_length= snprintf(cas_buffer, sizeof(cas_buffer), " %llu", (unsigned long long)cas);
 268     if (size_t(cas_buffer_length) >= sizeof(cas_buffer) or cas_buffer_length < 0)
 269     {
 270       return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
 271                                  memcached_literal_param("snprintf(MEMCACHED_MAXIMUM_INTEGER_DISPLAY_LENGTH)"));
 272     }
 273   }
 274
 275   libmemcached_io_vector_st vector[]=
 276   {
 277     { NULL, 0 },
 278     { storage_op_string(verb), strlen(storage_op_string(verb))},
 279     { memcached_array_string(ptr->_namespace), memcached_array_size(ptr->_namespace) },
 280     { key, key_length },
 281     { flags_buffer, flags_buffer_length },
 282     { expiration_buffer, expiration_buffer_length },
 283     { value_buffer, value_buffer_length },
 284     { cas_buffer, cas_buffer_length },
 285     { " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
 286     { memcached_literal_param("\r\n") },
 287     { value, value_length },
 288     { memcached_literal_param("\r\n") }
 289   };
 290
 291   /* Send command header */
 292   memcached_return_t rc=  memcached_vdo(instance, vector, 12, flush);
 293
 294   // If we should not reply, return with MEMCACHED_SUCCESS, unless error
 295   if (reply == false)
 296   {
 297     return memcached_success(rc) ? MEMCACHED_SUCCESS : rc;
 298   }
 299
 300   if (flush == false)
 301   {
 302     return memcached_success(rc) ? MEMCACHED_BUFFERED : rc;
 303   }
 304
 305   if (rc == MEMCACHED_SUCCESS)
 306   {
 307     char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
 308     rc= memcached_response(instance, buffer, sizeof(buffer), NULL);
 309
 310     if (rc == MEMCACHED_STORED)
 311     {
 312       return MEMCACHED_SUCCESS;
 313     }
 314   }
 315
 316   if (rc == MEMCACHED_WRITE_FAILURE)
 317   {
 318     memcached_io_reset(instance);
 319   }
 320
 321   assert(memcached_failed(rc));
 322   if (memcached_has_error(ptr) == false)
 323   {
 324     return memcached_set_error(*ptr, rc, MEMCACHED_AT);
 325   }
 326
 327   return rc;
 328 }
 329
 330 static inline memcached_return_t memcached_send(memcached_st *ptr,
 331                                                 const char *group_key, size_t group_key_length,
 332                                                 const char *key, size_t key_length,
 333                                                 const char *value, size_t value_length,
 334                                                 const time_t expiration,
 335                                                 const uint32_t flags,
 336                                                 const uint64_t cas,
 337                                                 memcached_storage_action_t verb)
 338 {
 339   memcached_return_t rc;
 340   if (memcached_failed(rc= initialize_query(ptr, true)))
 341   {
 342     return rc;
 343   }
 344
 345   if (memcached_failed(memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 346   {
 347     return memcached_last_error(ptr);
 348   }
 349
 350   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 351   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 352
 353   WATCHPOINT_SET(instance->io_wait_count.read= 0);
 354   WATCHPOINT_SET(instance->io_wait_count.write= 0);
 355
 356
 357   bool flush= true;
 358   if (memcached_is_buffering(instance->root) and verb == SET_OP)
 359   {
 360     flush= false;
 361   }
 362
 363   bool reply= memcached_is_replying(ptr);
 364
 365   if (memcached_is_binary(ptr))
 366   {
 367     return memcached_send_binary(ptr, instance, server_key,
 368                                  key, key_length,
 369                                  value, value_length, expiration,
 370                                  flags, cas, flush, reply, verb);
 371   }
 372
 373   return memcached_send_ascii(ptr, instance,
 374                               key, key_length,
 375                               value, value_length, expiration,
 376                               flags, cas, flush, reply, verb);
 377 }
 378
 379
 380 memcached_return_t memcached_set(memcached_st *ptr, const char *key, size_t key_length,
 381                                  const char *value, size_t value_length,
 382                                  time_t expiration,
 383                                  uint32_t flags)
 384 {
 385   memcached_return_t rc;
 386   LIBMEMCACHED_MEMCACHED_SET_START();
 387   rc= memcached_send(ptr, key, key_length,
 388                      key, key_length, value, value_length,
 389                      expiration, flags, 0, SET_OP);
 390   LIBMEMCACHED_MEMCACHED_SET_END();
 391   return rc;
 392 }
 393
 394 memcached_return_t memcached_add(memcached_st *ptr,
 395                                  const char *key, size_t key_length,
 396                                  const char *value, size_t value_length,
 397                                  time_t expiration,
 398                                  uint32_t flags)
 399 {
 400   memcached_return_t rc;
 401   LIBMEMCACHED_MEMCACHED_ADD_START();
 402   rc= memcached_send(ptr, key, key_length,
 403                      key, key_length, value, value_length,
 404                      expiration, flags, 0, ADD_OP);
 405
 406   if (rc == MEMCACHED_NOTSTORED or rc == MEMCACHED_DATA_EXISTS)
 407   {
 408     memcached_set_error(*ptr, rc, MEMCACHED_AT);
 409   }
 410   LIBMEMCACHED_MEMCACHED_ADD_END();
 411   return rc;
 412 }
 413
 414 memcached_return_t memcached_replace(memcached_st *ptr,
 415                                      const char *key, size_t key_length,
 416                                      const char *value, size_t value_length,
 417                                      time_t expiration,
 418                                      uint32_t flags)
 419 {
 420   memcached_return_t rc;
 421   LIBMEMCACHED_MEMCACHED_REPLACE_START();
 422   rc= memcached_send(ptr, key, key_length,
 423                      key, key_length, value, value_length,
 424                      expiration, flags, 0, REPLACE_OP);
 425   LIBMEMCACHED_MEMCACHED_REPLACE_END();
 426   return rc;
 427 }
 428
 429 memcached_return_t memcached_prepend(memcached_st *ptr,
 430                                      const char *key, size_t key_length,
 431                                      const char *value, size_t value_length,
 432                                      time_t expiration,
 433                                      uint32_t flags)
 434 {
 435   memcached_return_t rc;
 436   rc= memcached_send(ptr, key, key_length,
 437                      key, key_length, value, value_length,
 438                      expiration, flags, 0, PREPEND_OP);
 439   return rc;
 440 }
 441
 442 memcached_return_t memcached_append(memcached_st *ptr,
 443                                     const char *key, size_t key_length,
 444                                     const char *value, size_t value_length,
 445                                     time_t expiration,
 446                                     uint32_t flags)
 447 {
 448   memcached_return_t rc;
 449   rc= memcached_send(ptr, key, key_length,
 450                      key, key_length, value, value_length,
 451                      expiration, flags, 0, APPEND_OP);
 452   return rc;
 453 }
 454
 455 memcached_return_t memcached_cas(memcached_st *ptr,
 456                                  const char *key, size_t key_length,
 457                                  const char *value, size_t value_length,
 458                                  time_t expiration,
 459                                  uint32_t flags,
 460                                  uint64_t cas)
 461 {
 462   memcached_return_t rc;
 463   rc= memcached_send(ptr, key, key_length,
 464                      key, key_length, value, value_length,
 465                      expiration, flags, cas, CAS_OP);
 466   return rc;
 467 }
 468
 469 memcached_return_t memcached_set_by_key(memcached_st *ptr,
 470                                         const char *group_key,
 471                                         size_t group_key_length,
 472                                         const char *key, size_t key_length,
 473                                         const char *value, size_t value_length,
 474                                         time_t expiration,
 475                                         uint32_t flags)
 476 {
 477   memcached_return_t rc;
 478   LIBMEMCACHED_MEMCACHED_SET_START();
 479   rc= memcached_send(ptr, group_key, group_key_length,
 480                      key, key_length, value, value_length,
 481                      expiration, flags, 0, SET_OP);
 482   LIBMEMCACHED_MEMCACHED_SET_END();
 483   return rc;
 484 }
 485
 486 memcached_return_t memcached_add_by_key(memcached_st *ptr,
 487                                         const char *group_key, size_t group_key_length,
 488                                         const char *key, size_t key_length,
 489                                         const char *value, size_t value_length,
 490                                         time_t expiration,
 491                                         uint32_t flags)
 492 {
 493   memcached_return_t rc;
 494   LIBMEMCACHED_MEMCACHED_ADD_START();
 495   rc= memcached_send(ptr, group_key, group_key_length,
 496                      key, key_length, value, value_length,
 497                      expiration, flags, 0, ADD_OP);
 498   LIBMEMCACHED_MEMCACHED_ADD_END();
 499   return rc;
 500 }
 501
 502 memcached_return_t memcached_replace_by_key(memcached_st *ptr,
 503                                             const char *group_key, size_t group_key_length,
 504                                             const char *key, size_t key_length,
 505                                             const char *value, size_t value_length,
 506                                             time_t expiration,
 507                                             uint32_t flags)
 508 {
 509   memcached_return_t rc;
 510   LIBMEMCACHED_MEMCACHED_REPLACE_START();
 511   rc= memcached_send(ptr, group_key, group_key_length,
 512                      key, key_length, value, value_length,
 513                      expiration, flags, 0, REPLACE_OP);
 514   LIBMEMCACHED_MEMCACHED_REPLACE_END();
 515   return rc;
 516 }
 517
 518 memcached_return_t memcached_prepend_by_key(memcached_st *ptr,
 519                                             const char *group_key, size_t group_key_length,
 520                                             const char *key, size_t key_length,
 521                                             const char *value, size_t value_length,
 522                                             time_t expiration,
 523                                             uint32_t flags)
 524 {
 525   return memcached_send(ptr, group_key, group_key_length,
 526                         key, key_length, value, value_length,
 527                         expiration, flags, 0, PREPEND_OP);
 528 }
 529
 530 memcached_return_t memcached_append_by_key(memcached_st *ptr,
 531                                            const char *group_key, size_t group_key_length,
 532                                            const char *key, size_t key_length,
 533                                            const char *value, size_t value_length,
 534                                            time_t expiration,
 535                                            uint32_t flags)
 536 {
 537   return memcached_send(ptr, group_key, group_key_length,
 538                         key, key_length, value, value_length,
 539                         expiration, flags, 0, APPEND_OP);
 540 }
 541
 542 memcached_return_t memcached_cas_by_key(memcached_st *ptr,
 543                                         const char *group_key, size_t group_key_length,
 544                                         const char *key, size_t key_length,
 545                                         const char *value, size_t value_length,
 546                                         time_t expiration,
 547                                         uint32_t flags,
 548                                         uint64_t cas)
 549 {
 550   return  memcached_send(ptr, group_key, group_key_length,
 551                          key, key_length, value, value_length,
 552                          expiration, flags, cas, CAS_OP);
 553 }
 554