git.m6w6.name Git - m6w6/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 #include "config.h"
   8 #include <assert.h>
   9 #include <sys/types.h>
  10 #include <sys/socket.h>
  11 #include <netdb.h>
  12 #include <netinet/tcp.h>
  13 #include <stdio.h>
  14 #include <unistd.h>
  15 #include <fcntl.h>
  16 #include <errno.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19
  20 #include <libmemcached/protocol_handler.h>
  21 #include <libmemcached/byteorder.h>
  22 #include "storage.h"
  23 #include "memcached_light.h"
  24
  25 static protocol_binary_response_status noop_command_handler(const void *cookie,
  26                                                             protocol_binary_request_header *header,
  27                                                             memcached_binary_protocol_raw_response_handler response_handler)
  28 {
  29   protocol_binary_response_no_extras response= {
  30     .message.header.response= {
  31       .magic= PROTOCOL_BINARY_RES,
  32       .opcode= PROTOCOL_BINARY_CMD_NOOP,
  33       .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
  34       .opaque= header->request.opaque
  35     }
  36   };
  37
  38   return response_handler(cookie, header, (void*)&response);
  39 }
  40
  41 static protocol_binary_response_status quit_command_handler(const void *cookie,
  42                                                             protocol_binary_request_header *header,
  43                                                             memcached_binary_protocol_raw_response_handler response_handler)
  44 {
  45   protocol_binary_response_no_extras response= {
  46     .message.header.response= {
  47       .magic= PROTOCOL_BINARY_RES,
  48       .opcode= PROTOCOL_BINARY_CMD_QUIT,
  49       .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
  50       .opaque= header->request.opaque
  51     }
  52   };
  53
  54   if (header->request.opcode == PROTOCOL_BINARY_CMD_QUIT)
  55     response_handler(cookie, header, (void*)&response);
  56
  57   /* I need a better way to signal to close the connection */
  58   return PROTOCOL_BINARY_RESPONSE_EIO;
  59 }
  60
  61 static protocol_binary_response_status get_command_handler(const void *cookie,
  62                                                            protocol_binary_request_header *header,
  63                                                            memcached_binary_protocol_raw_response_handler response_handler)
  64 {
  65   uint8_t opcode= header->request.opcode;
  66   union {
  67     protocol_binary_response_get response;
  68     char buffer[4096];
  69   } msg= {
  70     .response.message.header.response= {
  71       .magic= PROTOCOL_BINARY_RES,
  72       .opcode= opcode,
  73       .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
  74       .opaque= header->request.opaque
  75     }
  76   };
  77
  78   struct item *item= get_item(header + 1, ntohs(header->request.keylen));
  79   if (item)
  80   {
  81     msg.response.message.body.flags= htonl(item->flags);
  82     char *ptr= (char*)(msg.response.bytes + sizeof(*header) + 4);
  83     uint32_t bodysize= 4;
  84     msg.response.message.header.response.cas= htonll(item->cas);
  85     if (opcode == PROTOCOL_BINARY_CMD_GETK || opcode == PROTOCOL_BINARY_CMD_GETKQ)
  86     {
  87       memcpy(ptr, item->key, item->nkey);
  88       msg.response.message.header.response.keylen= htons((uint16_t)item->nkey);
  89       ptr += item->nkey;
  90       bodysize += (uint32_t)item->nkey;
  91     }
  92     memcpy(ptr, item->data, item->size);
  93     bodysize += (uint32_t)item->size;
  94     msg.response.message.header.response.bodylen= htonl(bodysize);
  95     msg.response.message.header.response.extlen= 4;
  96
  97     release_item(item);
  98     return response_handler(cookie, header, (void*)&msg);
  99   }
 100   else if (opcode == PROTOCOL_BINARY_CMD_GET || opcode == PROTOCOL_BINARY_CMD_GETK)
 101   {
 102     msg.response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_KEY_ENOENT);
 103     return response_handler(cookie, header, (void*)&msg);
 104   }
 105
 106   /* Q shouldn't report a miss ;-) */
 107   return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 108 }
 109
 110 static protocol_binary_response_status delete_command_handler(const void *cookie,
 111                                                               protocol_binary_request_header *header,
 112                                                               memcached_binary_protocol_raw_response_handler response_handler)
 113 {
 114   size_t keylen= ntohs(header->request.keylen);
 115   char *key= ((char*)header) + sizeof(*header);
 116   protocol_binary_response_no_extras response= {
 117     .message.header.response= {
 118       .magic= PROTOCOL_BINARY_RES,
 119       .opcode= header->request.opcode,
 120       .opaque= header->request.opaque
 121     }
 122   };
 123
 124   if (!delete_item(key, keylen))
 125   {
 126     response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_KEY_ENOENT);
 127     return response_handler(cookie, header, (void*)&response);
 128   }
 129   else if (header->request.opcode == PROTOCOL_BINARY_CMD_DELETE)
 130   {
 131     /* DELETEQ doesn't want success response */
 132     response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS);
 133     return response_handler(cookie, header, (void*)&response);
 134   }
 135
 136   return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 137 }
 138
 139 static protocol_binary_response_status flush_command_handler(const void *cookie,
 140                                                              protocol_binary_request_header *header,
 141                                                              memcached_binary_protocol_raw_response_handler response_handler)
 142 {
 143   uint8_t opcode= header->request.opcode;
 144
 145   /* @fixme sett inn when! */
 146   flush(0);
 147
 148   if (opcode == PROTOCOL_BINARY_CMD_FLUSH)
 149   {
 150     protocol_binary_response_no_extras response= {
 151       .message.header.response= {
 152         .magic= PROTOCOL_BINARY_RES,
 153         .opcode= opcode,
 154         .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
 155         .opaque= header->request.opaque
 156       }
 157     };
 158     return response_handler(cookie, header, (void*)&response);
 159   }
 160
 161   return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 162 }
 163
 164 static protocol_binary_response_status arithmetic_command_handler(const void *cookie,
 165                                                                   protocol_binary_request_header *header,
 166                                                                   memcached_binary_protocol_raw_response_handler response_handler)
 167 {
 168   protocol_binary_request_incr *req= (void*)header;
 169   protocol_binary_response_incr response= {
 170     .message.header.response= {
 171       .magic= PROTOCOL_BINARY_RES,
 172       .opcode= header->request.opcode,
 173       .opaque= header->request.opaque,
 174     },
 175   };
 176
 177   uint16_t keylen= ntohs(header->request.keylen);
 178   uint64_t initial= ntohll(req->message.body.initial);
 179   uint64_t delta= ntohll(req->message.body.delta);
 180   uint32_t expiration= ntohl(req->message.body.expiration);
 181   uint32_t flags= 0;
 182   void *key= req->bytes + sizeof(req->bytes);
 183   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
 184
 185   uint64_t value= initial;
 186
 187   struct item *item= get_item(key, keylen);
 188   if (item != NULL)
 189   {
 190     if (header->request.opcode == PROTOCOL_BINARY_CMD_INCREMENT ||
 191         header->request.opcode == PROTOCOL_BINARY_CMD_INCREMENTQ)
 192     {
 193       value= (*(uint64_t*)item->data) + delta;
 194     }
 195     else
 196     {
 197       if (delta > *(uint64_t*)item->data)
 198       {
 199         value= 0;
 200       }
 201       else
 202       {
 203         value= *(uint64_t*)item->data - delta;
 204       }
 205     }
 206     expiration= (uint32_t)item->exp;
 207     flags= item->flags;
 208
 209     release_item(item);
 210     delete_item(key, keylen);
 211   }
 212
 213   item= create_item(key, keylen, NULL, sizeof(value), flags, (time_t)expiration);
 214   if (item == NULL)
 215   {
 216     rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
 217   }
 218   else
 219   {
 220     memcpy(item->data, &value, sizeof(value));
 221     put_item(item);
 222   }
 223
 224   response.message.header.response.status= htons(rval);
 225   if (rval == PROTOCOL_BINARY_RESPONSE_SUCCESS)
 226   {
 227     response.message.header.response.bodylen= ntohl(8);
 228     response.message.body.value= ntohll((*(uint64_t*)item->data));
 229     response.message.header.response.cas= ntohll(item->cas);
 230
 231     release_item(item);
 232     if (header->request.opcode == PROTOCOL_BINARY_CMD_INCREMENTQ ||
 233         header->request.opcode == PROTOCOL_BINARY_CMD_DECREMENTQ)
 234     {
 235       return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 236     }
 237   }
 238
 239   return response_handler(cookie, header, (void*)&response);
 240 }
 241
 242 static protocol_binary_response_status version_command_handler(const void *cookie,
 243                                                                protocol_binary_request_header *header,
 244                                                                memcached_binary_protocol_raw_response_handler response_handler)
 245 {
 246   const char *versionstring= "1.0.0";
 247   union {
 248     protocol_binary_response_header packet;
 249     char buffer[256];
 250   } response= {
 251     .packet.response= {
 252       .magic= PROTOCOL_BINARY_RES,
 253       .opcode= PROTOCOL_BINARY_CMD_VERSION,
 254       .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
 255       .opaque= header->request.opaque,
 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= 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= 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 != 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= 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= 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     response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_KEY_ENOENT);
 474   else if (header->request.cas == 0 || ntohll(header->request.cas) == item->cas)
 475   {
 476     release_item(item);
 477     delete_item(key, keylen);
 478     item= create_item(key, keylen, data, datalen, flags, timeout);
 479     if (item == NULL)
 480       response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_ENOMEM);
 481     else
 482     {
 483       put_item(item);
 484       /* REPLACEQ shouldn't return a message */
 485       if (header->request.opcode == PROTOCOL_BINARY_CMD_REPLACE)
 486       {
 487         response.message.header.response.cas= htonll(item->cas);
 488         release_item(item);
 489         return response_handler(cookie, header, (void*)&response);
 490       }
 491       release_item(item);
 492       return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 493     }
 494   }
 495   else
 496   {
 497     response.message.header.response.status= htons(PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS);
 498     release_item(item);
 499   }
 500
 501   return response_handler(cookie, header, (void*)&response);
 502 }
 503
 504 static protocol_binary_response_status stat_command_handler(const void *cookie,
 505                                                             protocol_binary_request_header *header,
 506                                                             memcached_binary_protocol_raw_response_handler response_handler)
 507 {
 508   /* Just send the terminating packet*/
 509   protocol_binary_response_no_extras response= {
 510     .message= {
 511       .header.response= {
 512         .magic= PROTOCOL_BINARY_RES,
 513         .opcode= PROTOCOL_BINARY_CMD_STAT,
 514         .status= htons(PROTOCOL_BINARY_RESPONSE_SUCCESS),
 515         .opaque= header->request.opaque
 516       }
 517     }
 518   };
 519
 520   return response_handler(cookie, header, (void*)&response);
 521 }
 522
 523 memcached_binary_protocol_callback_st interface_v0_impl= {
 524   .interface_version= 0,
 525 #ifdef FUTURE
 526   /*
 527   ** There is a number of bugs in the extra options for gcc causing
 528   ** warning on these struct initializers. It hurts my heart to remove
 529   ** it so I'll just leave it in here so that we can enable it when
 530   ** we can drop support for the broken compilers
 531   */
 532   .interface.v0.comcode[PROTOCOL_BINARY_CMD_GET]= get_command_handler,
 533   .interface.v0.comcode[PROTOCOL_BINARY_CMD_SET]= set_command_handler,
 534   .interface.v0.comcode[PROTOCOL_BINARY_CMD_ADD]= add_command_handler,
 535   .interface.v0.comcode[PROTOCOL_BINARY_CMD_REPLACE]= replace_command_handler,
 536   .interface.v0.comcode[PROTOCOL_BINARY_CMD_DELETE]= delete_command_handler,
 537   .interface.v0.comcode[PROTOCOL_BINARY_CMD_INCREMENT]= arithmetic_command_handler,
 538   .interface.v0.comcode[PROTOCOL_BINARY_CMD_DECREMENT]= arithmetic_command_handler,
 539   .interface.v0.comcode[PROTOCOL_BINARY_CMD_QUIT]= quit_command_handler,
 540   .interface.v0.comcode[PROTOCOL_BINARY_CMD_FLUSH]= flush_command_handler,
 541   .interface.v0.comcode[PROTOCOL_BINARY_CMD_GETQ]= get_command_handler,
 542   .interface.v0.comcode[PROTOCOL_BINARY_CMD_NOOP]= noop_command_handler,
 543   .interface.v0.comcode[PROTOCOL_BINARY_CMD_VERSION]= version_command_handler,
 544   .interface.v0.comcode[PROTOCOL_BINARY_CMD_GETK]= get_command_handler,
 545   .interface.v0.comcode[PROTOCOL_BINARY_CMD_GETKQ]= get_command_handler,
 546   .interface.v0.comcode[PROTOCOL_BINARY_CMD_APPEND]= concat_command_handler,
 547   .interface.v0.comcode[PROTOCOL_BINARY_CMD_PREPEND]= concat_command_handler,
 548   .interface.v0.comcode[PROTOCOL_BINARY_CMD_STAT]= stat_command_handler,
 549   .interface.v0.comcode[PROTOCOL_BINARY_CMD_SETQ]= set_command_handler,
 550   .interface.v0.comcode[PROTOCOL_BINARY_CMD_ADDQ]= add_command_handler,
 551   .interface.v0.comcode[PROTOCOL_BINARY_CMD_REPLACEQ]= replace_command_handler,
 552   .interface.v0.comcode[PROTOCOL_BINARY_CMD_DELETEQ]= delete_command_handler,
 553   .interface.v0.comcode[PROTOCOL_BINARY_CMD_INCREMENTQ]= arithmetic_command_handler,
 554   .interface.v0.comcode[PROTOCOL_BINARY_CMD_DECREMENTQ]= arithmetic_command_handler,
 555   .interface.v0.comcode[PROTOCOL_BINARY_CMD_QUITQ]= quit_command_handler,
 556   .interface.v0.comcode[PROTOCOL_BINARY_CMD_FLUSHQ]= flush_command_handler,
 557   .interface.v0.comcode[PROTOCOL_BINARY_CMD_APPENDQ]= concat_command_handler,
 558   .interface.v0.comcode[PROTOCOL_BINARY_CMD_PREPENDQ]= concat_command_handler,
 559 #endif
 560 };
 561
 562 void initialize_iterface_v0_handler(void)
 563 {
 564   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_GET]= get_command_handler;
 565   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_SET]= set_command_handler;
 566   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_ADD]= add_command_handler;
 567   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_REPLACE]= replace_command_handler;
 568   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_DELETE]= delete_command_handler;
 569   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_INCREMENT]= arithmetic_command_handler;
 570   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_DECREMENT]= arithmetic_command_handler;
 571   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_QUIT]= quit_command_handler;
 572   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_FLUSH]= flush_command_handler;
 573   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_GETQ]= get_command_handler;
 574   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_NOOP]= noop_command_handler;
 575   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_VERSION]= version_command_handler;
 576   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_GETK]= get_command_handler;
 577   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_GETKQ]= get_command_handler;
 578   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_APPEND]= concat_command_handler;
 579   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_PREPEND]= concat_command_handler;
 580   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_STAT]= stat_command_handler;
 581   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_SETQ]= set_command_handler;
 582   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_ADDQ]= add_command_handler;
 583   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_REPLACEQ]= replace_command_handler;
 584   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_DELETEQ]= delete_command_handler;
 585   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_INCREMENTQ]= arithmetic_command_handler;
 586   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_DECREMENTQ]= arithmetic_command_handler;
 587   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_QUITQ]= quit_command_handler;
 588   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_FLUSHQ]= flush_command_handler;
 589   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_APPENDQ]= concat_command_handler;
 590   interface_v0_impl.interface.v0.comcode[PROTOCOL_BINARY_CMD_PREPENDQ]= concat_command_handler;
 591 }