git.m6w6.name Git - m6w6/libmemcached/blob - example/interface_v1.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 1
   4  * in the protocol library. If you compare the implementation with the one
   5  * in interface_v0.c you will see that this implementation is much easier and
   6  * hides all of the protocol logic and let you focus on the application
   7  * logic. One "problem" with this layer is that it is synchronous, so that
   8  * you will not receive the next command before a answer to the previous
   9  * command is being sent.
  10  */
  11 #include "config.h"
  12 #include <assert.h>
  13 #include <sys/types.h>
  14 #include <stdio.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17 #include <errno.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20
  21 #include <libmemcached/protocol_handler.h>
  22 #include <example/byteorder.h>
  23 #include "storage.h"
  24
  25 static protocol_binary_response_status add_handler(const void *cookie,
  26                                                    const void *key,
  27                                                    uint16_t keylen,
  28                                                    const void *data,
  29                                                    uint32_t datalen,
  30                                                    uint32_t flags,
  31                                                    uint32_t exptime,
  32                                                    uint64_t *cas)
  33 {
  34   (void)cookie;
  35   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
  36   struct item* item= get_item(key, keylen);
  37   if (item == NULL)
  38   {
  39     item= create_item(key, keylen, data, datalen, flags, (time_t)exptime);
  40     if (item == 0)
  41     {
  42       rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
  43     }
  44     else
  45     {
  46       put_item(item);
  47       *cas= item->cas;
  48       release_item(item);
  49     }
  50   }
  51   else
  52   {
  53     rval= PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
  54   }
  55
  56   return rval;
  57 }
  58
  59 static protocol_binary_response_status append_handler(const void *cookie,
  60                                                       const void *key,
  61                                                       uint16_t keylen,
  62                                                       const void* val,
  63                                                       uint32_t vallen,
  64                                                       uint64_t cas,
  65                                                       uint64_t *result_cas)
  66 {
  67   (void)cookie;
  68   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
  69
  70   struct item *item= get_item(key, keylen);
  71   struct item *nitem;
  72
  73   if (item == NULL)
  74   {
  75     rval= PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
  76   }
  77   else if (cas != 0 && cas != item->cas)
  78   {
  79     rval= PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
  80   }
  81   else if ((nitem= create_item(key, keylen, NULL, item->size + vallen,
  82                                item->flags, item->exp)) == NULL)
  83   {
  84     release_item(item);
  85     rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
  86   }
  87   else
  88   {
  89     memcpy(nitem->data, item->data, item->size);
  90     memcpy(((char*)(nitem->data)) + item->size, val, vallen);
  91     release_item(item);
  92     delete_item(key, keylen);
  93     put_item(nitem);
  94     *result_cas= nitem->cas;
  95     release_item(nitem);
  96   }
  97
  98   return rval;
  99 }
 100
 101 static protocol_binary_response_status decrement_handler(const void *cookie,
 102                                                          const void *key,
 103                                                          uint16_t keylen,
 104                                                          uint64_t delta,
 105                                                          uint64_t initial,
 106                                                          uint32_t expiration,
 107                                                          uint64_t *result,
 108                                                          uint64_t *result_cas) {
 109   (void)cookie;
 110   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
 111   uint64_t val= initial;
 112   struct item *item= get_item(key, keylen);
 113
 114   if (item != NULL)
 115   {
 116     if (delta > *(uint64_t*)item->data)
 117       val= 0;
 118     else
 119       val= *(uint64_t*)item->data - delta;
 120
 121     expiration= (uint32_t)item->exp;
 122     release_item(item);
 123     delete_item(key, keylen);
 124   }
 125
 126   item= create_item(key, keylen, NULL, sizeof(initial), 0, (time_t)expiration);
 127   if (item == 0)
 128   {
 129     rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
 130   }
 131   else
 132   {
 133     memcpy(item->data, &val, sizeof(val));
 134     put_item(item);
 135     *result= val;
 136     *result_cas= item->cas;
 137     release_item(item);
 138   }
 139
 140   return rval;
 141 }
 142
 143 static protocol_binary_response_status delete_handler(const void *cookie,
 144                                                       const void *key,
 145                                                       uint16_t keylen,
 146                                                       uint64_t cas) {
 147   (void)cookie;
 148   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
 149
 150   if (cas != 0)
 151   {
 152     struct item *item= get_item(key, keylen);
 153     if (item != NULL)
 154     {
 155       if (item->cas != cas)
 156       {
 157         release_item(item);
 158         return PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
 159       }
 160       release_item(item);
 161     }
 162   }
 163
 164   if (!delete_item(key, keylen))
 165   {
 166     rval= PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
 167   }
 168
 169   return rval;
 170 }
 171
 172
 173 static protocol_binary_response_status flush_handler(const void *cookie,
 174                                                      uint32_t when) {
 175
 176   (void)cookie;
 177   flush(when);
 178   return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 179 }
 180
 181 static protocol_binary_response_status get_handler(const void *cookie,
 182                                                    const void *key,
 183                                                    uint16_t keylen,
 184                                                    memcached_binary_protocol_get_response_handler response_handler) {
 185   struct item *item= get_item(key, keylen);
 186
 187   if (item == NULL)
 188   {
 189     return PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
 190   }
 191
 192   protocol_binary_response_status rc;
 193   rc= response_handler(cookie, key, (uint16_t)keylen,
 194                           item->data, (uint32_t)item->size, item->flags,
 195                           item->cas);
 196   release_item(item);
 197   return rc;
 198 }
 199
 200 static protocol_binary_response_status increment_handler(const void *cookie,
 201                                                          const void *key,
 202                                                          uint16_t keylen,
 203                                                          uint64_t delta,
 204                                                          uint64_t initial,
 205                                                          uint32_t expiration,
 206                                                          uint64_t *result,
 207                                                          uint64_t *result_cas) {
 208   (void)cookie;
 209   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
 210   uint64_t val= initial;
 211   struct item *item= get_item(key, keylen);
 212
 213   if (item != NULL)
 214   {
 215     val= (*(uint64_t*)item->data) + delta;
 216     expiration= (uint32_t)item->exp;
 217     release_item(item);
 218     delete_item(key, keylen);
 219   }
 220
 221   item= create_item(key, keylen, NULL, sizeof(initial), 0, (time_t)expiration);
 222   if (item == NULL)
 223   {
 224     rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
 225   }
 226   else
 227   {
 228     char buffer[1024] = {0};
 229     memcpy(buffer, key, keylen);
 230     memcpy(item->data, &val, sizeof(val));
 231     put_item(item);
 232     *result= val;
 233     *result_cas= item->cas;
 234     release_item(item);
 235   }
 236
 237   return rval;
 238 }
 239
 240 static protocol_binary_response_status noop_handler(const void *cookie) {
 241   (void)cookie;
 242   return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 243 }
 244
 245 static protocol_binary_response_status prepend_handler(const void *cookie,
 246                                                        const void *key,
 247                                                        uint16_t keylen,
 248                                                        const void* val,
 249                                                        uint32_t vallen,
 250                                                        uint64_t cas,
 251                                                        uint64_t *result_cas) {
 252   (void)cookie;
 253   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
 254
 255   struct item *item= get_item(key, keylen);
 256   struct item *nitem= NULL;
 257
 258   if (item == NULL)
 259   {
 260     rval= PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
 261   }
 262   else if (cas != 0 && cas != item->cas)
 263   {
 264     rval= PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
 265   }
 266   else if ((nitem= create_item(key, keylen, NULL, item->size + vallen,
 267                                  item->flags, item->exp)) == NULL)
 268   {
 269     rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
 270   }
 271   else
 272   {
 273     memcpy(nitem->data, val, vallen);
 274     memcpy(((char*)(nitem->data)) + vallen, item->data, item->size);
 275     release_item(item);
 276     item= NULL;
 277     delete_item(key, keylen);
 278     put_item(nitem);
 279     *result_cas= nitem->cas;
 280   }
 281
 282   if (item)
 283     release_item(item);
 284
 285   if (nitem)
 286     release_item(nitem);
 287
 288   return rval;
 289 }
 290
 291 static protocol_binary_response_status quit_handler(const void *cookie) {
 292   (void)cookie;
 293   return PROTOCOL_BINARY_RESPONSE_SUCCESS;
 294 }
 295
 296 static protocol_binary_response_status replace_handler(const void *cookie,
 297                                                        const void *key,
 298                                                        uint16_t keylen,
 299                                                        const void* data,
 300                                                        uint32_t datalen,
 301                                                        uint32_t flags,
 302                                                        uint32_t exptime,
 303                                                        uint64_t cas,
 304                                                        uint64_t *result_cas) {
 305   (void)cookie;
 306   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
 307   struct item* item= get_item(key, keylen);
 308
 309   if (item == NULL)
 310   {
 311     rval= PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
 312   }
 313   else if (cas == 0 || cas == item->cas)
 314   {
 315     release_item(item);
 316     delete_item(key, keylen);
 317     item= create_item(key, keylen, data, datalen, flags, (time_t)exptime);
 318     if (item == 0)
 319     {
 320       rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
 321     }
 322     else
 323     {
 324       put_item(item);
 325       *result_cas= item->cas;
 326       release_item(item);
 327     }
 328   }
 329   else
 330   {
 331     rval= PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
 332     release_item(item);
 333   }
 334
 335   return rval;
 336 }
 337
 338 static protocol_binary_response_status set_handler(const void *cookie,
 339                                                    const void *key,
 340                                                    uint16_t keylen,
 341                                                    const void* data,
 342                                                    uint32_t datalen,
 343                                                    uint32_t flags,
 344                                                    uint32_t exptime,
 345                                                    uint64_t cas,
 346                                                    uint64_t *result_cas) {
 347   (void)cookie;
 348   protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
 349
 350   if (cas != 0)
 351   {
 352     struct item* item= get_item(key, keylen);
 353     if (item != NULL && cas != item->cas)
 354     {
 355       /* Invalid CAS value */
 356       release_item(item);
 357       return PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
 358     }
 359   }
 360
 361   delete_item(key, keylen);
 362   struct item* item= create_item(key, keylen, data, datalen, flags, (time_t)exptime);
 363   if (item == 0)
 364   {
 365     rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
 366   }
 367   else
 368   {
 369     put_item(item);
 370     *result_cas= item->cas;
 371     release_item(item);
 372   }
 373
 374   return rval;
 375 }
 376
 377 static protocol_binary_response_status stat_handler(const void *cookie,
 378                                                     const void *key,
 379                                                     uint16_t keylen,
 380                                                     memcached_binary_protocol_stat_response_handler response_handler) {
 381   (void)key;
 382   (void)keylen;
 383   /* Just return an empty packet */
 384   return response_handler(cookie, NULL, 0, NULL, 0);
 385 }
 386
 387 static protocol_binary_response_status version_handler(const void *cookie,
 388                                                        memcached_binary_protocol_version_response_handler response_handler) {
 389   const char *version= "0.1.1";
 390   return response_handler(cookie, version, (uint32_t)strlen(version));
 391 }
 392
 393 memcached_binary_protocol_callback_st interface_v1_impl= {
 394   .interface_version= MEMCACHED_PROTOCOL_HANDLER_V1,
 395   .interface.v1= {
 396     .add= add_handler,
 397     .append= append_handler,
 398     .decrement= decrement_handler,
 399     .delete= delete_handler,
 400     .flush= flush_handler,
 401     .get= get_handler,
 402     .increment= increment_handler,
 403     .noop= noop_handler,
 404     .prepend= prepend_handler,
 405     .quit= quit_handler,
 406     .replace= replace_handler,
 407     .set= set_handler,
 408     .stat= stat_handler,
 409     .version= version_handler
 410   }
 411 };