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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 <stdint.h>
  15 #include <sys/types.h>
  16
  17 #ifdef __cplusplus
  18 extern "C" {
  19 #endif
  20
  21 typedef struct memcached_st memcached_st;
  22 typedef struct memcached_stat_st memcached_stat_st;
  23 typedef struct memcached_result_st memcached_result_st;
  24 typedef struct memcached_string_st memcached_string_st;
  25 typedef struct memcached_server_st memcached_server_st;
  26
  27 #define MEMCACHED_DEFAULT_PORT 11211
  28 #define MEMCACHED_DEFAULT_COMMAND_SIZE 350
  29 #define SMALL_STRING_LEN 1024
  30 #define HUGE_STRING_LEN 8196
  31 #define MEMCACHED_MAX_KEY 251 /* We add one to have it null terminated */
  32 #define MEMCACHED_MAX_BUFFER HUGE_STRING_LEN
  33
  34 typedef enum {
  35   MEMCACHED_SUCCESS,
  36   MEMCACHED_FAILURE,
  37   MEMCACHED_HOST_LOCKUP_FAILURE,
  38   MEMCACHED_CONNECTION_FAILURE,
  39   MEMCACHED_CONNECTION_BIND_FAILURE,
  40   MEMCACHED_WRITE_FAILURE,
  41   MEMCACHED_READ_FAILURE,
  42   MEMCACHED_UNKNOWN_READ_FAILURE,
  43   MEMCACHED_PROTOCOL_ERROR,
  44   MEMCACHED_CLIENT_ERROR,
  45   MEMCACHED_SERVER_ERROR,
  46   MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE,
  47   MEMCACHED_DATA_EXISTS,
  48   MEMCACHED_DATA_DOES_NOT_EXIST,
  49   MEMCACHED_NOTSTORED,
  50   MEMCACHED_STORED,
  51   MEMCACHED_NOTFOUND,
  52   MEMCACHED_MEMORY_ALLOCATION_FAILURE,
  53   MEMCACHED_PARTIAL_READ,
  54   MEMCACHED_SOME_ERRORS,
  55   MEMCACHED_NO_SERVERS,
  56   MEMCACHED_END,
  57   MEMCACHED_DELETED,
  58   MEMCACHED_VALUE,
  59   MEMCACHED_STAT,
  60   MEMCACHED_ERRNO,
  61   MEMCACHED_FAIL_UNIX_SOCKET,
  62   MEMCACHED_NOT_SUPPORTED,
  63   MEMCACHED_NO_KEY_PROVIDED,
  64   MEMCACHED_MAXIMUM_RETURN, /* Always add new error code before */
  65 } memcached_return;
  66
  67 typedef enum {
  68   MEMCACHED_BEHAVIOR_NO_BLOCK,
  69   MEMCACHED_BEHAVIOR_TCP_NODELAY,
  70   MEMCACHED_BEHAVIOR_HASH,
  71   MEMCACHED_BEHAVIOR_KETAMA,
  72   MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE,
  73   MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE,
  74 } memcached_behavior;
  75
  76 typedef enum {
  77   MEMCACHED_HASH_DEFAULT= 0,
  78   MEMCACHED_HASH_MD5,
  79   MEMCACHED_HASH_CRC,
  80   MEMCACHED_HASH_FNV1_64,
  81   MEMCACHED_HASH_FNV1A_64,
  82   MEMCACHED_HASH_FNV1_32,
  83   MEMCACHED_HASH_FNV1A_32,
  84   MEMCACHED_HASH_KETAMA,
  85 } memcached_hash;
  86
  87 typedef enum {
  88   MEMCACHED_CONNECTION_UNKNOWN,
  89   MEMCACHED_CONNECTION_TCP,
  90   MEMCACHED_CONNECTION_UDP,
  91   MEMCACHED_CONNECTION_UNIX_SOCKET,
  92 } memcached_connection;
  93
  94 typedef enum {
  95   MEMCACHED_NOT_ALLOCATED,
  96   MEMCACHED_ALLOCATED,
  97 } memcached_allocated;
  98
  99 struct memcached_server_st {
 100   char *hostname;
 101   unsigned int port;
 102   int fd;
 103   unsigned int stack_responses;
 104   unsigned int cursor_active;
 105   char write_buffer[MEMCACHED_MAX_BUFFER];
 106   size_t write_buffer_offset;
 107   char read_buffer[MEMCACHED_MAX_BUFFER];
 108   size_t read_buffer_length;
 109   char *read_ptr;
 110   memcached_connection type;
 111 };
 112
 113 struct memcached_stat_st {
 114   unsigned int pid;
 115   unsigned int uptime;
 116   unsigned int threads;
 117   time_t time;
 118   char version[8];
 119   unsigned int pointer_size;
 120   unsigned int rusage_user;
 121   unsigned int rusage_system;
 122   unsigned int rusage_user_seconds;
 123   unsigned int rusage_user_microseconds;
 124   unsigned int rusage_system_seconds;
 125   unsigned int rusage_system_microseconds;
 126   unsigned int curr_items;
 127   unsigned int total_items;
 128   unsigned long long bytes;
 129   unsigned int curr_connections;
 130   unsigned int total_connections;
 131   unsigned int connection_structures;
 132   unsigned long long cmd_get;
 133   unsigned long long cmd_set;
 134   unsigned long long get_hits;
 135   unsigned long long get_misses;
 136   unsigned long long evictions;
 137   unsigned long long bytes_read;
 138   unsigned long long bytes_written;
 139   unsigned int limit_maxbytes;
 140 };
 141
 142 struct memcached_string_st {
 143   memcached_st *root;
 144   memcached_allocated is_allocated;
 145   char *string;
 146   char *end;
 147   size_t current_size;
 148   size_t block_size;
 149 };
 150
 151 struct memcached_result_st {
 152   memcached_allocated is_allocated;
 153   memcached_st *root;
 154   char key[MEMCACHED_MAX_KEY];
 155   size_t key_length;
 156   memcached_string_st value;
 157   uint16_t flags;
 158   uint64_t cas;
 159 };
 160
 161 struct memcached_st {
 162   memcached_allocated is_allocated;
 163   memcached_server_st *hosts;
 164   unsigned int number_of_hosts;
 165   unsigned int cursor_server;
 166   char connected;
 167   int cached_errno;
 168   unsigned long long flags;
 169   int send_size;
 170   int recv_size;
 171   memcached_string_st result_buffer;
 172   memcached_hash hash;
 173   memcached_return warning; /* Future Use */
 174 };
 175
 176 /* Public API */
 177 memcached_st *memcached_create(memcached_st *ptr);
 178 void memcached_free(memcached_st *ptr);
 179 memcached_st *memcached_clone(memcached_st *clone, memcached_st *ptr);
 180
 181 memcached_return memcached_delete(memcached_st *ptr, char *key, size_t key_length,
 182                                   time_t expiration);
 183 memcached_return memcached_increment(memcached_st *ptr,
 184                                      char *key, size_t key_length,
 185                                      unsigned int offset,
 186                                      uint64_t *value);
 187 memcached_return memcached_decrement(memcached_st *ptr,
 188                                      char *key, size_t key_length,
 189                                      unsigned int offset,
 190                                      uint64_t *value);
 191 void memcached_stat_free(memcached_st *, memcached_stat_st *);
 192 memcached_stat_st *memcached_stat(memcached_st *ptr, char *args, memcached_return *error);
 193 memcached_return memcached_stat_servername(memcached_stat_st *stat, char *args,
 194                                            char *hostname, unsigned int port);
 195 memcached_return memcached_flush(memcached_st *ptr, time_t expiration);
 196 memcached_return memcached_verbosity(memcached_st *ptr, unsigned int verbosity);
 197 void memcached_quit(memcached_st *ptr);
 198 char *memcached_strerror(memcached_st *ptr, memcached_return rc);
 199 memcached_return memcached_behavior_set(memcached_st *ptr, memcached_behavior flag, void *data);
 200 unsigned long long memcached_behavior_get(memcached_st *ptr, memcached_behavior flag);
 201
 202 /* All of the functions for adding data to the server */
 203 memcached_return memcached_set(memcached_st *ptr, char *key, size_t key_length,
 204                                char *value, size_t value_length,
 205                                time_t expiration,
 206                                uint16_t  flags);
 207 memcached_return memcached_add(memcached_st *ptr, char *key, size_t key_length,
 208                                char *value, size_t value_length,
 209                                time_t expiration,
 210                                uint16_t  flags);
 211 memcached_return memcached_replace(memcached_st *ptr, char *key, size_t key_length,
 212                                    char *value, size_t value_length,
 213                                    time_t expiration,
 214                                    uint16_t  flags);
 215
 216 /* Get functions */
 217 char *memcached_get(memcached_st *ptr, char *key, size_t key_length,
 218                     size_t *value_length,
 219                     uint16_t *flags,
 220                     memcached_return *error);
 221 memcached_return memcached_mget(memcached_st *ptr,
 222                                 char **keys, size_t *key_length,
 223                                 unsigned int number_of_keys);
 224 char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length,
 225                       size_t *value_length, uint16_t *flags,
 226                       memcached_return *error);
 227 memcached_result_st *memcached_fetch_result(memcached_st *ptr,
 228                                             memcached_result_st *result,
 229                                             memcached_return *error);
 230
 231 /* Server Public functions */
 232 #define memcached_server_count(A) A->number_of_hosts
 233 #define memcached_server_name(A,B) B.hostname
 234 #define memcached_server_port(A,B) B.port
 235 #define memcached_server_list(A) A->hosts
 236 #define memcached_server_response_count(A,B) A->hosts[B].stack_responses
 237
 238 memcached_return memcached_server_add_unix_socket(memcached_st *ptr,
 239                                                   char *filename);
 240 memcached_return memcached_server_add(memcached_st *ptr, char *hostname,
 241                                       unsigned int port);
 242 void memcached_server_list_free(memcached_server_st *ptr);
 243 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list);
 244
 245 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 246                                              char *hostname, unsigned int port,
 247                                              memcached_return *error);
 248 unsigned int memcached_server_list_count(memcached_server_st *ptr);
 249 memcached_server_st *memcached_servers_parse(char *server_strings);
 250
 251 char *memcached_stat_get_value(memcached_st *ptr, memcached_stat_st *stat,
 252                                char *key, memcached_return *error);
 253 char ** memcached_stat_get_keys(memcached_st *ptr, memcached_stat_st *stat,
 254                                 memcached_return *error);
 255
 256 /* Result Struct */
 257 void memcached_result_free(memcached_result_st *result);
 258 memcached_result_st *memcached_result_create(memcached_st *ptr,
 259                                              memcached_result_st *result);
 260 #define memcached_result_key_value(A) A->key
 261 #define memcached_result_key_length(A) A->key_length
 262 #ifdef FIX
 263 #define memcached_result_value(A) memcached_string_value(A->value)
 264 #define memcached_result_length(A) memcached_string_length(A->value)
 265 #else
 266 char *memcached_result_value(memcached_result_st *ptr);
 267 size_t memcached_result_length(memcached_result_st *ptr);
 268 #endif
 269 #define memcached_result_flags(A) A->flags
 270 #define memcached_result_cas(A) A->cas
 271
 272
 273 #ifndef __WATCHPOINT_H__
 274 #define __WATCHPOINT_H__
 275 /* Some personal debugging functions */
 276 #ifdef HAVE_DEBUG
 277 #define WATCHPOINT fprintf(stderr, "\nWATCHPOINT %s:%d (%s)\n", __FILE__, __LINE__,__func__);fflush(stdout);
 278 #ifdef __MEMCACHED_H__
 279 #define WATCHPOINT_ERROR(A) fprintf(stderr, "\nWATCHPOINT %s:%d %s\n", __FILE__, __LINE__, memcached_strerror(NULL, A));fflush(stdout);
 280 #endif
 281 #define WATCHPOINT_STRING(A) fprintf(stderr, "\nWATCHPOINT %s:%d (%s) %s\n", __FILE__, __LINE__,__func__,A);fflush(stdout);
 282 #define WATCHPOINT_NUMBER(A) fprintf(stderr, "\nWATCHPOINT %s:%d (%s) %zu\n", __FILE__, __LINE__,__func__,(size_t)(A));fflush(stdout);
 283 #define WATCHPOINT_ERRNO(A) fprintf(stderr, "\nWATCHPOINT %s:%d (%s) %s\n", __FILE__, __LINE__,__func__, strerror(A));A= 0;fflush(stdout);
 284 #define WATCHPOINT_ASSERT(A) assert((A));
 285 #else
 286 /*
 287 #define WATCHPOINT { 1; };
 288 #define WATCHPOINT_ERROR(A) { 1; };
 289 #define WATCHPOINT_STRING(A) { 1; };
 290 #define WATCHPOINT_NUMBER(A) { 1; };
 291 #define WATCHPOINT_ERRNO(A) { 1; };
 292 #define WATCHPOINT_ASSERT(A) { 1; };
 293 */
 294 #define WATCHPOINT
 295 #ifdef __MEMCACHED_H__
 296 #define WATCHPOINT_ERROR(A)
 297 #endif
 298 #define WATCHPOINT_STRING(A)
 299 #define WATCHPOINT_NUMBER(A)
 300 #define WATCHPOINT_ERRNO(A)
 301 #define WATCHPOINT_ASSERT(A)
 302 #endif
 303
 304 #endif /* __WATCHPOINT_H__ */
 305
 306
 307 #ifdef __cplusplus
 308 }
 309 #endif
 310
 311 #endif /* __MEMCACHED_H__ */