git.m6w6.name Git - awesomized/libmemcached/blob - example/interface_v0.c

   1 /* -*- Mode: C; tab-width: 2; c-basic-offset: 2; indent-tabs-mode: nil -*- */
   2 /**
   3  * This file contains an implementation of the callback interface for level 0
   4  * in the protocol library. You might want to have your copy of the protocol
   5  * specification next to your coffee ;-)
   6  */
   7
   8 #include "config.h"
   9
  10 #include <assert.h>
  11 #include <sys/types.h>
  12 #include <stdio.h>
  13 #include <unistd.h>
  14 #include <fcntl.h>
  15 #include <errno.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18
  19 #include <libmemcachedprotocol-0.0/handler.h>
  20 #include <example/byteorder.h>
  21 #include "example/storage.h"
  22 #include "example/memcached_light.h"
  23
  24 static protocol_binary_response_status noop_command_handler(const void *cookie,
  25                                                             protocol_binary_request_header *header,
  26                                                             memcached_binary_protocol_raw_response_handler response_handler)
  27 {
  28   protocol_binary_response_no_extras response= {
  29     .message.header.response= {
  30       .magic= PROTOCOL_BINARY_RES,
  31       .opcode= PROTOCOL_BINARY_CMD_NOOP,
  32       .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
  33       .opaque= header->request.opaque
  34     }
  35   };
  36
  37   return response_handler(cookie, header, (void*)&response);
  38 }
  39
  40 static protocol_binary_response_status quit_command_handler(const void *cookie,
  41                                                             protocol_binary_request_header *header,
  42                                                             memcached_binary_protocol_raw_response_handler response_handler)
  43 {
  44   protocol_binary_response_no_extras response= {
  45     .message.header.response= {
  46       .magic= PROTOCOL_BINARY_RES,
  47       .opcode= PROTOCOL_BINARY_CMD_QUIT,
  48       .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
  49       .opaque= header->request.opaque
  50     }
  51   };
  52
  53   if (header->request.opcode == PROTOCOL_BINARY_CMD_QUIT)
  54     response_handler(cookie, header, (void*)&response);
  55
  56   /* I need a better way to signal to close the connection */
  57   return PROTOCOL_BINARY_RESPONSE_EINTERNAL;
  58 }
  59
  60 static protocol_binary_response_status get_command_handler(const void *cookie,
  61                                                            protocol_binary_request_header *header,
  62                                                            memcached_binary_protocol_raw_response_handler response_handler)
  63 {
  64   uint8_t opcode= header->request.opcode;
  65   union {
  66     protocol_binary_response_get response;
  67     char buffer[4096];
  68   } msg= {
  69     .response.message.header.response= {
  70       .magic= PROTOCOL_BINARY_RES,
  71       .opcode= opcode,
  72       .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
  73       .opaque= header->request.opaque
  74     }
  75   };
  76
  77   struct item *item= get_item(header + 1, ntohs(header->request.keylen));
  78   if (item)
  79   {
  80     msg.response.message.body.flags= htonl(item->flags);
  81     char *ptr= (char*)(msg.response.bytes + sizeof(*header) + 4);
  82     uint32_t bodysize= 4;
  83     msg.response.message.header.response.cas= example_htonll(item->cas);
  84     if (opcode == PROTOCOL_BINARY_CMD_GETK || opcode == PROTOCOL_BINARY_CMD_GETKQ)
  85     {
  86       memcpy(ptr, item->key, item->nkey);
  87       msg.response.message.header.response.keylen= htons((uint16_t)item->nkey);
  88       ptr += item->nkey;
  89       bodysize += (uint32_t)item->nkey;
  90     }
  91     memcpy(ptr, item->data, item->size);
  92     bodysize += (uint32_t)item->size;
  93     msg.response.message.header.response.bodylen= htonl(bodysize);
  94     msg.response.message.header.response.extlen= 4;
  95
  96     release_item(item);
  97     return response_handler(cookie, header, (void*)&msg);
  98   }
  99   else if (opcode == PROTOCOL_BINARY_CMD_GET || opcode == PROTOCOL_BINARY_CMD_GETK)
 100   {
 101     msg.response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_KEY_ENOENT);
 102     return response_handler(cookie, header, (void*)&msg);
 103   }
 104
 105   /* Q shouldn't report a miss ;-) */
 106   return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 107 }
 108
 109 static protocol_binary_response_status delete_command_handler(const void *cookie,
 110                                                               protocol_binary_request_header *header,
 111                                                               memcached_binary_protocol_raw_response_handler response_handler)
 112 {
 113   size_t keylen= ntohs(header->request.keylen);
 114   char *key= ((char*)header) + sizeof(*header);
 115   protocol_binary_response_no_extras response= {
 116     .message.header.response= {
 117       .magic= PROTOCOL_BINARY_RES,
 118       .opcode= header->request.opcode,
 119       .opaque= header->request.opaque
 120     }
 121   };
 122
 123   if (!delete_item(key, keylen))
 124   {
 125     response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_KEY_ENOENT);
 126     return response_handler(cookie, header, (void*)&response);
 127   }
 128   else if (header->request.opcode == PROTOCOL_BINARY_CMD_DELETE)
 129   {
 130     /* DELETEQ doesn't want success response */
 131     response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS);
 132     return response_handler(cookie, header, (void*)&response);
 133   }
 134
 135   return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 136 }
 137
 138 static protocol_binary_response_status flush_command_handler(const void *cookie,
 139                                                              protocol_binary_request_header *header,
 140                                                              memcached_binary_protocol_raw_response_handler response_handler)
 141 {
 142   uint8_t opcode= header->request.opcode;
 143
 144   /* @fixme sett inn when! */
 145   flush(0);
 146
 147   if (opcode == PROTOCOL_BINARY_CMD_FLUSH)
 148   {
 149     protocol_binary_response_no_extras response= {
 150       .message.header.response= {
 151         .magic= PROTOCOL_BINARY_RES,
 152         .opcode= opcode,
 153         .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
 154         .opaque= header->request.opaque
 155       }
 156     };
 157     return response_handler(cookie, header, (void*)&response);
 158   }
 159
 160   return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 161 }
 162
 163 static protocol_binary_response_status arithmetic_command_handler(const void *cookie,
 164                                                                   protocol_binary_request_header *header,
 165                                                                   memcached_binary_protocol_raw_response_handler response_handler)
 166 {
 167   protocol_binary_request_incr *req= (void*)header;
 168   protocol_binary_response_incr response= {
 169     .message.header.response= {
 170       .magic= PROTOCOL_BINARY_RES,
 171       .opcode= header->request.opcode,
 172       .opaque= header->request.opaque,
 173     },
 174   };
 175
 176   uint16_t keylen= ntohs(header->request.keylen);
 177   uint64_t initial= example_ntohll(req->message.body.initial);
 178   uint64_t delta= example_ntohll(req->message.body.delta);
 179   uint32_t expiration= ntohl(req->message.body.expiration);
 180   uint32_t flags= 0;
 181   void *key= req->bytes + sizeof(req->bytes);
 182   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
 183
 184   uint64_t value= initial;
 185
 186   struct item *item= get_item(key, keylen);
 187   if (item != NULL)
 188   {
 189     if (header->request.opcode == PROTOCOL_BINARY_CMD_INCREMENT ||
 190         header->request.opcode == PROTOCOL_BINARY_CMD_INCREMENTQ)
 191     {
 192       value= (*(uint64_t*)item->data) + delta;
 193     }
 194     else
 195     {
 196       if (delta > *(uint64_t*)item->data)
 197       {
 198         value= 0;
 199       }
 200       else
 201       {
 202         value= *(uint64_t*)item->data - delta;
 203       }
 204     }
 205     expiration= (uint32_t)item->exp;
 206     flags= item->flags;
 207
 208     release_item(item);
 209     delete_item(key, keylen);
 210   }
 211
 212   item= create_item(key, keylen, NULL, sizeof(value), flags, (time_t)expiration);
 213   if (item == NULL)
 214   {
 215     rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
 216   }
 217   else
 218   {
 219     memcpy(item->data, &value, sizeof(value));
 220     put_item(item);
 221   }
 222
 223   response.message.header.response.status= htons(rval);
 224   if (rval == PROTOCOL_BINARY_RESPONSE_SUCCESS)
 225   {
 226     response.message.header.response.bodylen= ntohl(8);
 227     response.message.body.value= example_ntohll((*(uint64_t*)item->data));
 228     response.message.header.response.cas= example_ntohll(item->cas);
 229
 230     release_item(item);
 231     if (header->request.opcode == PROTOCOL_BINARY_CMD_INCREMENTQ ||
 232         header->request.opcode == PROTOCOL_BINARY_CMD_DECREMENTQ)
 233     {
 234       return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 235     }
 236   }
 237
 238   return response_handler(cookie, header, (void*)&response);
 239 }
 240
 241 static protocol_binary_response_status version_command_handler(const void *cookie,
 242                                                                protocol_binary_request_header *header,
 243                                                                memcached_binary_protocol_raw_response_handler response_handler)
 244 {
 245   const char *versionstring= "1.0.0";
 246   union {
 247     protocol_binary_response_header packet;
 248     char buffer[256];
 249   } response= {
 250     .packet.response= {
 251       .magic= PROTOCOL_BINARY_RES,
 252       .opcode= PROTOCOL_BINARY_CMD_VERSION,
 253       .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
 254       .opaque= header->request.opaque,
 255       .cas= 0,
 256       .bodylen= htonl((uint32_t)strlen(versionstring))
 257     }
 258   };
 259
 260   memcpy(response.buffer + sizeof(response.packet), versionstring, strlen(versionstring));
 261
 262   return response_handler(cookie, header, (void*)&response);
 263 }
 264
 265 static protocol_binary_response_status concat_command_handler(const void *cookie,
 266                                                               protocol_binary_request_header *header,
 267                                                               memcached_binary_protocol_raw_response_handler response_handler)
 268 {
 269   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
 270   uint16_t keylen= ntohs(header->request.keylen);
 271   uint64_t cas= example_ntohll(header->request.cas);
 272   void *key= header + 1;
 273   uint32_t vallen= ntohl(header->request.bodylen) - keylen;
 274   void *val= (char*)key + keylen;
 275
 276   struct item *item= get_item(key, keylen);
 277   struct item *nitem= NULL;
 278
 279   if (item == NULL)
 280   {
 281     rval= PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
 282   }
 283   else if (cas != 0 && cas != item->cas)
 284   {
 285     rval= PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
 286   }
 287   else if ((nitem= create_item(key, keylen, NULL, item->size + vallen,
 288                                item->flags, item->exp)) == NULL)
 289   {
 290     release_item(item);
 291     rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
 292   }
 293   else
 294   {
 295     if (header->request.opcode == PROTOCOL_BINARY_CMD_APPEND ||
 296         header->request.opcode == PROTOCOL_BINARY_CMD_APPENDQ)
 297     {
 298       memcpy(nitem->data, item->data, item->size);
 299       memcpy(((char*)(nitem->data)) + item->size, val, vallen);
 300     }
 301     else
 302     {
 303       memcpy(nitem->data, val, vallen);
 304       memcpy(((char*)(nitem->data)) + vallen, item->data, item->size);
 305     }
 306     release_item(item);
 307     delete_item(key, keylen);
 308     put_item(nitem);
 309     cas= nitem->cas;
 310     release_item(nitem);
 311
 312     if (header->request.opcode == PROTOCOL_BINARY_CMD_APPEND ||
 313         header->request.opcode == PROTOCOL_BINARY_CMD_PREPEND)
 314     {
 315       protocol_binary_response_no_extras response= {
 316         .message= {
 317           .header.response= {
 318             .magic= PROTOCOL_BINARY_RES,
 319             .opcode= header->request.opcode,
 320             .status= htons(rval),
 321             .opaque= header->request.opaque,
 322             .cas= example_htonll(cas),
 323           }
 324         }
 325       };
 326       return response_handler(cookie, header, (void*)&response);
 327     }
 328   }
 329
 330   return rval;
 331 }
 332
 333 static protocol_binary_response_status set_command_handler(const void *cookie,
 334                                                            protocol_binary_request_header *header,
 335                                                            memcached_binary_protocol_raw_response_handler response_handler)
 336 {
 337   size_t keylen= ntohs(header->request.keylen);
 338   size_t datalen= ntohl(header->request.bodylen) - keylen - 8;
 339   protocol_binary_request_replace *request= (void*)header;
 340   uint32_t flags= ntohl(request->message.body.flags);
 341   time_t timeout= (time_t)ntohl(request->message.body.expiration);
 342   char *key= ((char*)header) + sizeof(*header) + 8;
 343   char *data= key + keylen;
 344
 345   protocol_binary_response_no_extras response= {
 346     .message= {
 347       .header.response= {
 348         .magic= PROTOCOL_BINARY_RES,
 349         .opcode= header->request.opcode,
 350         .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
 351         .opaque= header->request.opaque
 352       }
 353     }
 354   };
 355
 356   if (header->request.cas != 0)
 357   {
 358     /* validate cas */
 359     struct item* item= get_item(key, keylen);
 360     if (item != NULL)
 361     {
 362       if (item->cas != example_ntohll(header->request.cas))
 363       {
 364         release_item(item);
 365         response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS);
 366         return response_handler(cookie, header, (void*)&response);
 367       }
 368       release_item(item);
 369     }
 370   }
 371
 372   delete_item(key, keylen);
 373   struct item* item= create_item(key, keylen, data, datalen, flags, timeout);
 374   if (item == NULL)
 375   {
 376     response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_ENOMEM);
 377   }
 378   else
 379   {
 380     put_item(item);
 381     /* SETQ shouldn't return a message */
 382     if (header->request.opcode == PROTOCOL_BINARY_CMD_SET)
 383     {
 384       response.message.header.response.cas= example_htonll(item->cas);
 385       release_item(item);
 386       return response_handler(cookie, header, (void*)&response);
 387     }
 388     release_item(item);
 389
 390     return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 391   }
 392
 393   return response_handler(cookie, header, (void*)&response);
 394 }
 395
 396 static protocol_binary_response_status add_command_handler(const void *cookie,
 397                                                            protocol_binary_request_header *header,
 398                                                            memcached_binary_protocol_raw_response_handler response_handler)
 399 {
 400   size_t keylen= ntohs(header->request.keylen);
 401   size_t datalen= ntohl(header->request.bodylen) - keylen - 8;
 402   protocol_binary_request_add *request= (void*)header;
 403   uint32_t flags= ntohl(request->message.body.flags);
 404   time_t timeout= (time_t)ntohl(request->message.body.expiration);
 405   char *key= ((char*)header) + sizeof(*header) + 8;
 406   char *data= key + keylen;
 407
 408   protocol_binary_response_no_extras response= {
 409     .message= {
 410       .header.response= {
 411         .magic= PROTOCOL_BINARY_RES,
 412         .opcode= header->request.opcode,
 413         .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
 414         .opaque= header->request.opaque
 415       }
 416     }
 417   };
 418
 419   struct item* item= get_item(key, keylen);
 420   if (item == NULL)
 421   {
 422     item= create_item(key, keylen, data, datalen, flags, timeout);
 423     if (item == NULL)
 424       response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_ENOMEM);
 425     else
 426     {
 427       put_item(item);
 428       /* ADDQ shouldn't return a message */
 429       if (header->request.opcode == PROTOCOL_BINARY_CMD_ADD)
 430       {
 431         response.message.header.response.cas= example_htonll(item->cas);
 432         release_item(item);
 433         return response_handler(cookie, header, (void*)&response);
 434       }
 435       release_item(item);
 436       return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 437     }
 438   }
 439   else
 440   {
 441     release_item(item);
 442     response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS);
 443   }
 444
 445   return response_handler(cookie, header, (void*)&response);
 446 }
 447
 448 static protocol_binary_response_status replace_command_handler(const void *cookie,
 449                                                                protocol_binary_request_header *header,
 450                                                                memcached_binary_protocol_raw_response_handler response_handler)
 451 {
 452   size_t keylen= ntohs(header->request.keylen);
 453   size_t datalen= ntohl(header->request.bodylen) - keylen - 8;
 454   protocol_binary_request_replace *request= (void*)header;
 455   uint32_t flags= ntohl(request->message.body.flags);
 456   time_t timeout= (time_t)ntohl(request->message.body.expiration);
 457   char *key= ((char*)header) + sizeof(*header) + 8;
 458   char *data= key + keylen;
 459
 460   protocol_binary_response_no_extras response= {
 461     .message= {
 462       .header.response= {
 463         .magic= PROTOCOL_BINARY_RES,
 464         .opcode= header->request.opcode,
 465         .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
 466         .opaque= header->request.opaque
 467       }
 468     }
 469   };
 470
 471   struct item* item= get_item(key, keylen);
 472   if (item == NULL)
 473   {
 474     response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_KEY_ENOENT);
 475   }
 476   else if (header->request.cas == 0 || example_ntohll(header->request.cas) == item->cas)
 477   {
 478     release_item(item);
 479     delete_item(key, keylen);
 480     item= create_item(key, keylen, data, datalen, flags, timeout);
 481
 482     if (item == NULL)
 483     {
 484       response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_ENOMEM);
 485     }
 486     else
 487     {
 488       put_item(item);
 489       /* REPLACEQ shouldn't return a message */
 490       if (header->request.opcode == PROTOCOL_BINARY_CMD_REPLACE)
 491       {
 492         response.message.header.response.cas= example_htonll(item->cas);
 493         release_item(item);
 494         return response_handler(cookie, header, (void*)&response);
 495       }
 496       release_item(item);
 497       return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 498     }
 499   }
 500   else
 501   {
 502     response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS);
 503     release_item(item);
 504   }
 505
 506   return response_handler(cookie, header, (void*)&response);
 507 }
 508
 509 static protocol_binary_response_status stat_command_handler(const void *cookie,
 510                                                             protocol_binary_request_header *header,
 511                                                             memcached_binary_protocol_raw_response_handler response_handler)
 512 {
 513   /* Just send the terminating packet*/
 514   protocol_binary_response_no_extras response= {
 515     .message= {
 516       .header.response= {
 517         .magic= PROTOCOL_BINARY_RES,
 518         .opcode= PROTOCOL_BINARY_CMD_STAT,
 519         .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
 520         .opaque= header->request.opaque
 521       }
 522     }
 523   };
 524
 525   return response_handler(cookie, header, (void*)&response);
 526 }
 527
 528 memcached_binary_protocol_callback_st interface_v0_impl= {
 529   .interface_version= MEMCACHED_PROTOCOL_HANDLER_V0,
 530 #ifdef FUTURE
 531   /*
 532   ** There is a number of bugs in the extra options for gcc causing
 533   ** warning on these struct initializers. It hurts my heart to remove
 534   ** it so I'll just leave it in here so that we can enable it when
 535   ** we can drop support for the broken compilers
 536   */
 537   .interface.v0.comcode[PROTOCOL_BINARY_CMD_GET]= get_command_handler,
 538   .interface.v0.comcode[PROTOCOL_BINARY_CMD_SET]= set_command_handler,
 539   .interface.v0.comcode[PROTOCOL_BINARY_CMD_ADD]= add_command_handler,
 540   .interface.v0.comcode[PROTOCOL_BINARY_CMD_REPLACE]= replace_command_handler,
 541   .interface.v0.comcode[PROTOCOL_BINARY_CMD_DELETE]= delete_command_handler,
 542   .interface.v0.comcode[PROTOCOL_BINARY_CMD_INCREMENT]= arithmetic_command_handler,
 543   .interface.v0.comcode[PROTOCOL_BINARY_CMD_DECREMENT]= arithmetic_command_handler,
 544   .interface.v0.comcode[PROTOCOL_BINARY_CMD_QUIT]= quit_command_handler,
 545   .interface.v0.comcode[PROTOCOL_BINARY_CMD_FLUSH]= flush_command_handler,
 546   .interface.v0.comcode[PROTOCOL_BINARY_CMD_GETQ]= get_command_handler,
 547   .interface.v0.comcode[PROTOCOL_BINARY_CMD_NOOP]= noop_command_handler,
 548   .interface.v0.comcode[PROTOCOL_BINARY_CMD_VERSION]= version_command_handler,
 549   .interface.v0.comcode[PROTOCOL_BINARY_CMD_GETK]= get_command_handler,
 550   .interface.v0.comcode[PROTOCOL_BINARY_CMD_GETKQ]= get_command_handler,
 551   .interface.v0.comcode[PROTOCOL_BINARY_CMD_APPEND]= concat_command_handler,
 552   .interface.v0.comcode[PROTOCOL_BINARY_CMD_PREPEND]= concat_command_handler,
 553   .interface.v0.comcode[PROTOCOL_BINARY_CMD_STAT]= stat_command_handler,
 554   .interface.v0.comcode[PROTOCOL_BINARY_CMD_SETQ]= set_command_handler,
 555   .interface.v0.comcode[PROTOCOL_BINARY_CMD_ADDQ]= add_command_handler,
 556   .interface.v0.comcode[PROTOCOL_BINARY_CMD_REPLACEQ]= replace_command_handler,
 557   .interface.v0.comcode[PROTOCOL_BINARY_CMD_DELETEQ]= delete_command_handler,
 558   .interface.v0.comcode[PROTOCOL_BINARY_CMD_INCREMENTQ]= arithmetic_command_handler,
 559   .interface.v0.comcode[PROTOCOL_BINARY_CMD_DECREMENTQ]= arithmetic_command_handler,
 560   .interface.v0.comcode[PROTOCOL_BINARY_CMD_QUITQ]= quit_command_handler,
 561   .interface.v0.comcode[PROTOCOL_BINARY_CMD_FLUSHQ]= flush_command_handler,
 562   .interface.v0.comcode[PROTOCOL_BINARY_CMD_APPENDQ]= concat_command_handler,
 563   .interface.v0.comcode[PROTOCOL_BINARY_CMD_PREPENDQ]= concat_command_handler,
 564 #endif
 565 };
 566
 567 void initialize_interface_v0_handler(void)
 568 {
 569   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_GET]= get_command_handler;
 570   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_SET]= set_command_handler;
 571   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_ADD]= add_command_handler;
 572   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_REPLACE]= replace_command_handler;
 573   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_DELETE]= delete_command_handler;
 574   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_INCREMENT]= arithmetic_command_handler;
 575   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_DECREMENT]= arithmetic_command_handler;
 576   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_QUIT]= quit_command_handler;
 577   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_FLUSH]= flush_command_handler;
 578   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_GETQ]= get_command_handler;
 579   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_NOOP]= noop_command_handler;
 580   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_VERSION]= version_command_handler;
 581   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_GETK]= get_command_handler;
 582   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_GETKQ]= get_command_handler;
 583   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_APPEND]= concat_command_handler;
 584   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_PREPEND]= concat_command_handler;
 585   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_STAT]= stat_command_handler;
 586   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_SETQ]= set_command_handler;
 587   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_ADDQ]= add_command_handler;
 588   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_REPLACEQ]= replace_command_handler;
 589   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_DELETEQ]= delete_command_handler;
 590   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_INCREMENTQ]= arithmetic_command_handler;
 591   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_DECREMENTQ]= arithmetic_command_handler;
 592   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_QUITQ]= quit_command_handler;
 593   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_FLUSHQ]= flush_command_handler;
 594   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_APPENDQ]= concat_command_handler;
 595   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_PREPENDQ]= concat_command_handler;
 596 }