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   1 /*
   2  * Summary: interface for memcached server
   3  * Description: main include file for libmemcached
   4  *
   5  * Copy: See Copyright for the status of this software.
   6  *
   7  * Author: Brian Aker
   8  */
   9
  10 #ifndef __MEMCACHED_H__
  11 #define __MEMCACHED_H__
  12
  13 #include <stdlib.h>
  14 #include <inttypes.h>
  15 #include <sys/types.h>
  16 #include <netinet/in.h>
  17
  18 #ifdef __cplusplus
  19 extern "C" {
  20 #endif
  21
  22 /* These are Private and should not be used by applications */
  23 #define MEMCACHED_VERSION_STRING_LENGTH 12
  24
  25 /* Public defines */
  26 #define MEMCACHED_DEFAULT_PORT 11211
  27 #define MEMCACHED_MAX_KEY 251 /* We add one to have it null terminated */
  28 #define MEMCACHED_MAX_BUFFER 8196
  29 #define MEMCACHED_MAX_HOST_LENGTH 64
  30 #define MEMCACHED_WHEEL_SIZE 1024
  31 #define MEMCACHED_STRIDE 4
  32 #define MEMCACHED_DEFAULT_TIMEOUT INT32_MAX
  33
  34 /* string value */
  35 #define LIBMEMCACHED_VERSION_STRING "0.17"
  36
  37 typedef enum {
  38   MEMCACHED_SUCCESS,
  39   MEMCACHED_FAILURE,
  40   MEMCACHED_HOST_LOOKUP_FAILURE,
  41   MEMCACHED_CONNECTION_FAILURE,
  42   MEMCACHED_CONNECTION_BIND_FAILURE,
  43   MEMCACHED_WRITE_FAILURE,
  44   MEMCACHED_READ_FAILURE,
  45   MEMCACHED_UNKNOWN_READ_FAILURE,
  46   MEMCACHED_PROTOCOL_ERROR,
  47   MEMCACHED_CLIENT_ERROR,
  48   MEMCACHED_SERVER_ERROR,
  49   MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE,
  50   MEMCACHED_DATA_EXISTS,
  51   MEMCACHED_DATA_DOES_NOT_EXIST,
  52   MEMCACHED_NOTSTORED,
  53   MEMCACHED_STORED,
  54   MEMCACHED_NOTFOUND,
  55   MEMCACHED_MEMORY_ALLOCATION_FAILURE,
  56   MEMCACHED_PARTIAL_READ,
  57   MEMCACHED_SOME_ERRORS,
  58   MEMCACHED_NO_SERVERS,
  59   MEMCACHED_END,
  60   MEMCACHED_DELETED,
  61   MEMCACHED_VALUE,
  62   MEMCACHED_STAT,
  63   MEMCACHED_ERRNO,
  64   MEMCACHED_FAIL_UNIX_SOCKET,
  65   MEMCACHED_NOT_SUPPORTED,
  66   MEMCACHED_NO_KEY_PROVIDED,
  67   MEMCACHED_FETCH_NOTFINISHED,
  68   MEMCACHED_TIMEOUT,
  69   MEMCACHED_BUFFERED,
  70   MEMCACHED_BAD_KEY_PROVIDED,
  71   MEMCACHED_MAXIMUM_RETURN, /* Always add new error code before */
  72 } memcached_return;
  73
  74 typedef struct memcached_st memcached_st;
  75 typedef struct memcached_stat_st memcached_stat_st;
  76 typedef struct memcached_result_st memcached_result_st;
  77 typedef struct memcached_string_st memcached_string_st;
  78 typedef struct memcached_server_st memcached_server_st;
  79 typedef memcached_return (*memcached_clone_func)(memcached_st *parent, memcached_st *clone);
  80 typedef memcached_return (*memcached_cleanup_func)(memcached_st *ptr);
  81 typedef void (*memcached_free_function)(memcached_st *ptr, void *mem);
  82 typedef void *(*memcached_malloc_function)(memcached_st *ptr, const size_t size);
  83 typedef void *(*memcached_realloc_function)(memcached_st *ptr, void *mem, const size_t size);
  84
  85 typedef enum {
  86   MEMCACHED_DISTRIBUTION_MODULA,
  87   MEMCACHED_DISTRIBUTION_CONSISTENT,
  88 } memcached_server_distribution;
  89
  90 typedef enum {
  91   MEMCACHED_BEHAVIOR_NO_BLOCK,
  92   MEMCACHED_BEHAVIOR_TCP_NODELAY,
  93   MEMCACHED_BEHAVIOR_HASH,
  94   MEMCACHED_BEHAVIOR_KETAMA,
  95   MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE,
  96   MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE,
  97   MEMCACHED_BEHAVIOR_CACHE_LOOKUPS,
  98   MEMCACHED_BEHAVIOR_SUPPORT_CAS,
  99   MEMCACHED_BEHAVIOR_POLL_TIMEOUT,
 100   MEMCACHED_BEHAVIOR_DISTRIBUTION,
 101   MEMCACHED_BEHAVIOR_BUFFER_REQUESTS,
 102   MEMCACHED_BEHAVIOR_USER_DATA,
 103   MEMCACHED_BEHAVIOR_SORT_HOSTS,
 104 } memcached_behavior;
 105
 106 typedef enum {
 107   MEMCACHED_CALLBACK_USER_DATA,
 108   MEMCACHED_CALLBACK_CLEANUP_FUNCTION,
 109   MEMCACHED_CALLBACK_CLONE_FUNCTION,
 110   MEMCACHED_CALLBACK_MALLOC_FUNCTION,
 111   MEMCACHED_CALLBACK_REALLOC_FUNCTION,
 112   MEMCACHED_CALLBACK_FREE_FUNCTION,
 113 } memcached_callback;
 114
 115 typedef enum {
 116   MEMCACHED_HASH_DEFAULT= 0,
 117   MEMCACHED_HASH_MD5,
 118   MEMCACHED_HASH_CRC,
 119   MEMCACHED_HASH_FNV1_64,
 120   MEMCACHED_HASH_FNV1A_64,
 121   MEMCACHED_HASH_FNV1_32,
 122   MEMCACHED_HASH_FNV1A_32,
 123   MEMCACHED_HASH_KETAMA,
 124   MEMCACHED_HASH_HSIEH,
 125 } memcached_hash;
 126
 127 typedef enum {
 128   MEMCACHED_CONNECTION_UNKNOWN,
 129   MEMCACHED_CONNECTION_TCP,
 130   MEMCACHED_CONNECTION_UDP,
 131   MEMCACHED_CONNECTION_UNIX_SOCKET,
 132 } memcached_connection;
 133
 134 typedef enum {
 135   MEMCACHED_NOT_ALLOCATED,
 136   MEMCACHED_ALLOCATED,
 137   MEMCACHED_USED,
 138 } memcached_allocated;
 139
 140 struct memcached_server_st {
 141   char hostname[MEMCACHED_MAX_HOST_LENGTH];
 142   unsigned int port;
 143   int fd;
 144   int cached_errno;
 145   unsigned int cursor_active;
 146   char write_buffer[MEMCACHED_MAX_BUFFER];
 147   size_t write_buffer_offset;
 148   char read_buffer[MEMCACHED_MAX_BUFFER];
 149   size_t read_data_length;
 150   size_t read_buffer_length;
 151   char *read_ptr;
 152   memcached_allocated sockaddr_inited;
 153   struct addrinfo *address_info;
 154   memcached_connection type;
 155   uint8_t major_version;
 156   uint8_t minor_version;
 157   uint8_t micro_version;
 158   uint16_t count;
 159   memcached_st *root;
 160 };
 161
 162 struct memcached_stat_st {
 163   uint32_t pid;
 164   uint32_t uptime;
 165   uint32_t threads;
 166   uint32_t time;
 167   uint32_t pointer_size;
 168   uint32_t rusage_user_seconds;
 169   uint32_t rusage_user_microseconds;
 170   uint32_t rusage_system_seconds;
 171   uint32_t rusage_system_microseconds;
 172   uint32_t curr_items;
 173   uint32_t total_items;
 174   uint64_t limit_maxbytes;
 175   uint32_t curr_connections;
 176   uint32_t total_connections;
 177   uint32_t connection_structures;
 178   uint64_t bytes;
 179   uint64_t cmd_get;
 180   uint64_t cmd_set;
 181   uint64_t get_hits;
 182   uint64_t get_misses;
 183   uint64_t evictions;
 184   uint64_t bytes_read;
 185   uint64_t bytes_written;
 186   char version[MEMCACHED_VERSION_STRING_LENGTH];
 187 };
 188
 189 struct memcached_string_st {
 190   memcached_st *root;
 191   memcached_allocated is_allocated;
 192   char *string;
 193   char *end;
 194   size_t current_size;
 195   size_t block_size;
 196 };
 197
 198 struct memcached_result_st {
 199   memcached_allocated is_allocated;
 200   memcached_st *root;
 201   char key[MEMCACHED_MAX_KEY];
 202   size_t key_length;
 203   memcached_string_st value;
 204   uint32_t flags;
 205   uint64_t cas;
 206   /* Add result callback function */
 207 };
 208
 209 struct memcached_st {
 210   memcached_allocated is_allocated;
 211   memcached_server_st *hosts;
 212   unsigned int number_of_hosts;
 213   unsigned int cursor_server;
 214   int cached_errno;
 215   uint32_t flags;
 216   int send_size;
 217   int recv_size;
 218   int32_t poll_timeout;
 219   memcached_result_st result;
 220   memcached_hash hash;
 221   memcached_server_distribution distribution;
 222   void *user_data;
 223   unsigned int wheel[MEMCACHED_WHEEL_SIZE];
 224   memcached_clone_func on_clone;
 225   memcached_cleanup_func on_cleanup;
 226   memcached_free_function call_free;
 227   memcached_malloc_function call_malloc;
 228   memcached_realloc_function call_realloc;
 229 #ifdef NOT_USED /* Future Use */
 230   uint8_t replicas;
 231   memcached_return warning;
 232 #endif
 233 };
 234
 235 /* Public API */
 236 const char * memcached_lib_version(void);
 237
 238 memcached_st *memcached_create(memcached_st *ptr);
 239 void memcached_free(memcached_st *ptr);
 240 memcached_st *memcached_clone(memcached_st *clone, memcached_st *ptr);
 241
 242 memcached_return memcached_delete(memcached_st *ptr, char *key, size_t key_length,
 243                                   time_t expiration);
 244 memcached_return memcached_increment(memcached_st *ptr,
 245                                      char *key, size_t key_length,
 246                                      uint32_t offset,
 247                                      uint64_t *value);
 248 memcached_return memcached_decrement(memcached_st *ptr,
 249                                      char *key, size_t key_length,
 250                                      uint32_t offset,
 251                                      uint64_t *value);
 252 void memcached_stat_free(memcached_st *, memcached_stat_st *);
 253 memcached_stat_st *memcached_stat(memcached_st *ptr, char *args, memcached_return *error);
 254 memcached_return memcached_stat_servername(memcached_stat_st *stat, char *args,
 255                                            char *hostname, unsigned int port);
 256 memcached_return memcached_flush(memcached_st *ptr, time_t expiration);
 257 memcached_return memcached_verbosity(memcached_st *ptr, unsigned int verbosity);
 258 void memcached_quit(memcached_st *ptr);
 259 char *memcached_strerror(memcached_st *ptr, memcached_return rc);
 260 memcached_return memcached_behavior_set(memcached_st *ptr, memcached_behavior flag, void *data);
 261 unsigned long long memcached_behavior_get(memcached_st *ptr, memcached_behavior flag);
 262
 263 /* All of the functions for adding data to the server */
 264 memcached_return memcached_set(memcached_st *ptr, char *key, size_t key_length,
 265                                char *value, size_t value_length,
 266                                time_t expiration,
 267                                uint32_t  flags);
 268 memcached_return memcached_add(memcached_st *ptr, char *key, size_t key_length,
 269                                char *value, size_t value_length,
 270                                time_t expiration,
 271                                uint32_t  flags);
 272 memcached_return memcached_replace(memcached_st *ptr, char *key, size_t key_length,
 273                                    char *value, size_t value_length,
 274                                    time_t expiration,
 275                                    uint32_t  flags);
 276 memcached_return memcached_append(memcached_st *ptr,
 277                                   char *key, size_t key_length,
 278                                   char *value, size_t value_length,
 279                                   time_t expiration,
 280                                   uint32_t flags);
 281 memcached_return memcached_prepend(memcached_st *ptr,
 282                                    char *key, size_t key_length,
 283                                    char *value, size_t value_length,
 284                                    time_t expiration,
 285                                    uint32_t flags);
 286 memcached_return memcached_cas(memcached_st *ptr,
 287                                char *key, size_t key_length,
 288                                char *value, size_t value_length,
 289                                time_t expiration,
 290                                uint32_t flags,
 291                                uint64_t cas);
 292
 293 /* Get functions */
 294 char *memcached_get(memcached_st *ptr, char *key, size_t key_length,
 295                     size_t *value_length,
 296                     uint32_t *flags,
 297                     memcached_return *error);
 298 memcached_return memcached_mget(memcached_st *ptr,
 299                                 char **keys, size_t *key_length,
 300                                 unsigned int number_of_keys);
 301 char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length,
 302                       size_t *value_length, uint32_t *flags,
 303                       memcached_return *error);
 304 memcached_result_st *memcached_fetch_result(memcached_st *ptr,
 305                                             memcached_result_st *result,
 306                                             memcached_return *error);
 307
 308 /* Server Public functions */
 309 #define memcached_server_count(A) (A)->number_of_hosts
 310 #define memcached_server_name(A,B) (B).hostname
 311 #define memcached_server_port(A,B) (B).port
 312 #define memcached_server_list(A) (A)->hosts
 313 #define memcached_server_response_count(A) (A)->cursor_active
 314
 315
 316 memcached_return memcached_server_add_udp(memcached_st *ptr,
 317                                           char *hostname,
 318                                           unsigned int port);
 319 memcached_return memcached_server_add_unix_socket(memcached_st *ptr,
 320                                                   char *filename);
 321 memcached_return memcached_server_add(memcached_st *ptr, char *hostname,
 322                                       unsigned int port);
 323 void memcached_server_list_free(memcached_server_st *ptr);
 324 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list);
 325
 326 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 327                                              char *hostname, unsigned int port,
 328                                              memcached_return *error);
 329 unsigned int memcached_server_list_count(memcached_server_st *ptr);
 330 memcached_server_st *memcached_servers_parse(char *server_strings);
 331
 332 char *memcached_stat_get_value(memcached_st *ptr, memcached_stat_st *stat,
 333                                char *key, memcached_return *error);
 334 char ** memcached_stat_get_keys(memcached_st *ptr, memcached_stat_st *stat,
 335                                 memcached_return *error);
 336
 337 char *memcached_get_by_key(memcached_st *ptr,
 338                            char *master_key, size_t master_key_length,
 339                            char *key, size_t key_length,
 340                            size_t *value_length,
 341                            uint32_t *flags,
 342                            memcached_return *error);
 343
 344 memcached_return memcached_mget_by_key(memcached_st *ptr,
 345                                        char *master_key, size_t master_key_length,
 346                                        char **keys, size_t *key_length,
 347                                        unsigned int number_of_keys);
 348
 349 memcached_return memcached_set_by_key(memcached_st *ptr,
 350                                       char *master_key, size_t master_key_length,
 351                                       char *key, size_t key_length,
 352                                       char *value, size_t value_length,
 353                                       time_t expiration,
 354                                       uint32_t flags);
 355
 356 memcached_return memcached_add_by_key(memcached_st *ptr,
 357                                       char *master_key, size_t master_key_length,
 358                                       char *key, size_t key_length,
 359                                       char *value, size_t value_length,
 360                                       time_t expiration,
 361                                       uint32_t flags);
 362
 363 memcached_return memcached_replace_by_key(memcached_st *ptr,
 364                                           char *master_key, size_t master_key_length,
 365                                           char *key, size_t key_length,
 366                                           char *value, size_t value_length,
 367                                           time_t expiration,
 368                                           uint32_t flags);
 369
 370 memcached_return memcached_prepend_by_key(memcached_st *ptr,
 371                                           char *master_key, size_t master_key_length,
 372                                           char *key, size_t key_length,
 373                                           char *value, size_t value_length,
 374                                           time_t expiration,
 375                                           uint32_t flags);
 376
 377 memcached_return memcached_append_by_key(memcached_st *ptr,
 378                                          char *master_key, size_t master_key_length,
 379                                          char *key, size_t key_length,
 380                                          char *value, size_t value_length,
 381                                          time_t expiration,
 382                                          uint32_t flags);
 383
 384 memcached_return memcached_cas_by_key(memcached_st *ptr,
 385                                       char *master_key, size_t master_key_length,
 386                                       char *key, size_t key_length,
 387                                       char *value, size_t value_length,
 388                                       time_t expiration,
 389                                       uint32_t flags,
 390                                       uint64_t cas);
 391 memcached_return memcached_delete_by_key(memcached_st *ptr,
 392                                          char *master_key, size_t master_key_length,
 393                                          char *key, size_t key_length,
 394                                          time_t expiration);
 395
 396 memcached_return memcached_fetch_execute(memcached_st *ptr,
 397                                              unsigned int (*callback[])(memcached_st *ptr, memcached_result_st *result, void *context),
 398                                              void *context,
 399                                              unsigned int number_of_callbacks
 400                                              );
 401
 402 memcached_return memcached_callback_set(memcached_st *ptr,
 403                                         memcached_callback flag,
 404                                         void *data);
 405 void *memcached_callback_get(memcached_st *ptr,
 406                              memcached_callback flag,
 407                              memcached_return *error);
 408
 409 /* Result Struct */
 410 void memcached_result_free(memcached_result_st *result);
 411 memcached_result_st *memcached_result_create(memcached_st *ptr,
 412                                              memcached_result_st *result);
 413 #define memcached_result_key_value(A) (A)->key
 414 #define memcached_result_key_length(A) (A)->key_length
 415 #ifdef FIX
 416 #define memcached_result_value(A) memcached_string_value((A)->value)
 417 #define memcached_result_length(A) memcached_string_length((A)->value)
 418 #else
 419 char *memcached_result_value(memcached_result_st *ptr);
 420 size_t memcached_result_length(memcached_result_st *ptr);
 421 #endif
 422 #define memcached_result_flags(A) (A)->flags
 423 #define memcached_result_cas(A) (A)->cas
 424
 425
 426 #ifndef __WATCHPOINT_H__
 427 #define __WATCHPOINT_H__
 428 /* Some personal debugging functions */
 429 #ifdef HAVE_DEBUG
 430 #define WATCHPOINT fprintf(stderr, "\nWATCHPOINT %s:%d (%s)\n", __FILE__, __LINE__,__func__);fflush(stdout);
 431 #ifdef __MEMCACHED_H__
 432 #define WATCHPOINT_ERROR(A) fprintf(stderr, "\nWATCHPOINT %s:%d %s\n", __FILE__, __LINE__, memcached_strerror(NULL, A));fflush(stdout);
 433 #define WATCHPOINT_IFERROR(A) if(A != MEMCACHED_SUCCESS)fprintf(stderr, "\nWATCHPOINT %s:%d %s\n", __FILE__, __LINE__, memcached_strerror(NULL, A));fflush(stdout);
 434 #endif
 435 #define WATCHPOINT_STRING(A) fprintf(stderr, "\nWATCHPOINT %s:%d (%s) %s\n", __FILE__, __LINE__,__func__,A);fflush(stdout);
 436 #define WATCHPOINT_STRING_LENGTH(A,B) fprintf(stderr, "\nWATCHPOINT %s:%d (%s) %.*s\n", __FILE__, __LINE__,__func__,(int)B,A);fflush(stdout);
 437 #define WATCHPOINT_NUMBER(A) fprintf(stderr, "\nWATCHPOINT %s:%d (%s) %zu\n", __FILE__, __LINE__,__func__,(size_t)(A));fflush(stdout);
 438 #define WATCHPOINT_ERRNO(A) fprintf(stderr, "\nWATCHPOINT %s:%d (%s) %s\n", __FILE__, __LINE__,__func__, strerror(A));fflush(stdout);
 439 #define WATCHPOINT_ASSERT(A) assert((A));
 440 #else
 441 #define WATCHPOINT
 442 #ifdef __MEMCACHED_H__
 443 #define WATCHPOINT_ERROR(A)
 444 #define WATCHPOINT_IFERROR(A)
 445 #endif
 446 #define WATCHPOINT_STRING(A)
 447 #define WATCHPOINT_NUMBER(A)
 448 #define WATCHPOINT_ERRNO(A)
 449 #define WATCHPOINT_ASSERT(A)
 450 #endif
 451
 452 #endif /* __WATCHPOINT_H__ */
 453
 454
 455 #ifdef __cplusplus
 456 }
 457 #endif
 458
 459 #endif /* __MEMCACHED_H__ */