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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_string_st memcached_string_st;
  24 typedef struct memcached_server_st memcached_server_st;
  25
  26 #define MEMCACHED_DEFAULT_PORT 11211
  27 #define MEMCACHED_DEFAULT_COMMAND_SIZE 350
  28 #define SMALL_STRING_LEN 1024
  29 #define HUGE_STRING_LEN 8196
  30 #define MEMCACHED_MAX_KEY 251 /* We add one to have it null terminated */
  31 //#define MEMCACHED_MAX_BUFFER 8196
  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_MAXIMUM_RETURN, /* Always add new error code before */
  62 } memcached_return;
  63
  64 typedef enum {
  65   MEMCACHED_BEHAVIOR_NO_BLOCK,
  66   MEMCACHED_BEHAVIOR_TCP_NODELAY,
  67   MEMCACHED_BEHAVIOR_MD5_HASHING,
  68   MEMCACHED_BEHAVIOR_KETAMA,
  69   MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE,
  70   MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE,
  71 } memcached_behavior;
  72
  73 typedef enum {
  74   MEMCACHED_NOT_ALLOCATED= 0,
  75   MEMCACHED_ALLOCATED= 1,
  76 } memcached_allocated;
  77
  78 struct memcached_server_st {
  79   char *hostname;
  80   unsigned int port;
  81   int fd;
  82   unsigned int stack_responses;
  83   unsigned int cursor_active;
  84 };
  85
  86 struct memcached_stat_st {
  87   unsigned int pid;
  88   unsigned int uptime;
  89   unsigned int threads;
  90   time_t time;
  91   char version[8];
  92   unsigned int pointer_size;
  93   unsigned int rusage_user;
  94   unsigned int rusage_system;
  95   unsigned int rusage_user_seconds;
  96   unsigned int rusage_user_microseconds;
  97   unsigned int rusage_system_seconds;
  98   unsigned int rusage_system_microseconds;
  99   unsigned int curr_items;
 100   unsigned int total_items;
 101   unsigned long long bytes;
 102   unsigned int curr_connections;
 103   unsigned int total_connections;
 104   unsigned int connection_structures;
 105   unsigned long long cmd_get;
 106   unsigned long long cmd_set;
 107   unsigned long long get_hits;
 108   unsigned long long get_misses;
 109   unsigned long long evictions;
 110   unsigned long long bytes_read;
 111   unsigned long long bytes_written;
 112   unsigned int limit_maxbytes;
 113 };
 114
 115 struct memcached_string_st {
 116   char *string;
 117   char *end;
 118   size_t current_size;
 119   size_t block_size;
 120 };
 121
 122 struct memcached_st {
 123   memcached_allocated is_allocated;
 124   memcached_server_st *hosts;
 125   unsigned int number_of_hosts;
 126   unsigned int cursor_server;
 127   char read_buffer[MEMCACHED_MAX_BUFFER];
 128   size_t read_buffer_length;
 129   char *read_ptr;
 130   char write_buffer[MEMCACHED_MAX_BUFFER];
 131   size_t write_buffer_offset;
 132   char connected;
 133   int my_errno;
 134   unsigned long long flags;
 135   int send_size;
 136   int recv_size;
 137   memcached_return warning; /* Future Use */
 138 };
 139
 140 /* Public API */
 141 memcached_st *memcached_create(memcached_st *ptr);
 142 void memcached_free(memcached_st *ptr);
 143
 144 memcached_return memcached_delete(memcached_st *ptr, char *key, size_t key_length,
 145                                   time_t expiration);
 146 memcached_return memcached_increment(memcached_st *ptr,
 147                                      char *key, size_t key_length,
 148                                      unsigned int offset,
 149                                      unsigned int *value);
 150 memcached_return memcached_decrement(memcached_st *ptr,
 151                                      char *key, size_t key_length,
 152                                      unsigned int offset,
 153                                      unsigned int *value);
 154 memcached_stat_st *memcached_stat(memcached_st *ptr, char *args, memcached_return *error);
 155 memcached_return memcached_stat_servername(memcached_stat_st *stat, char *args,
 156                                            char *hostname, unsigned int port);
 157 memcached_return memcached_flush(memcached_st *ptr, time_t expiration);
 158 memcached_return memcached_verbosity(memcached_st *ptr, unsigned int verbosity);
 159 void memcached_quit(memcached_st *ptr);
 160 char *memcached_strerror(memcached_st *ptr, memcached_return rc);
 161 memcached_return memcached_behavior_set(memcached_st *ptr, memcached_behavior flag, void *data);
 162 unsigned long long memcached_behavior_get(memcached_st *ptr, memcached_behavior flag);
 163
 164 /* All of the functions for adding data to the server */
 165 memcached_return memcached_set(memcached_st *ptr, char *key, size_t key_length,
 166                                char *value, size_t value_length,
 167                                time_t expiration,
 168                                uint16_t  flags);
 169 memcached_return memcached_add(memcached_st *ptr, char *key, size_t key_length,
 170                                char *value, size_t value_length,
 171                                time_t expiration,
 172                                uint16_t  flags);
 173 memcached_return memcached_replace(memcached_st *ptr, char *key, size_t key_length,
 174                                    char *value, size_t value_length,
 175                                    time_t expiration,
 176                                    uint16_t  flags);
 177
 178 /* Get functions */
 179 char *memcached_get(memcached_st *ptr, char *key, size_t key_length,
 180                     size_t *value_length,
 181                     uint16_t *flags,
 182                     memcached_return *error);
 183 memcached_return memcached_mget(memcached_st *ptr,
 184                                 char **keys, size_t *key_length,
 185                                 unsigned int number_of_keys);
 186 char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length,
 187                       size_t *value_length, uint16_t *flags,
 188                       memcached_return *error);
 189
 190 /* Server Public functions */
 191 #define memcached_server_count(A) A->number_of_hosts
 192 #define memcached_server_name(A,B) B.hostname
 193 #define memcached_server_port(A,B) B.port
 194 #define memcached_server_list(A) A->hosts
 195 #define memcached_server_response_count(A,B) A->hosts[B].stack_responses
 196
 197 memcached_return memcached_server_add(memcached_st *ptr, char *hostname,
 198                                       unsigned int port);
 199 void memcached_server_list_free(memcached_server_st *ptr);
 200 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list);
 201
 202 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 203                                              char *hostname, unsigned int port,
 204                                              memcached_return *error);
 205 unsigned int memcached_server_list_count(memcached_server_st *ptr);
 206 memcached_server_st *memcached_servers_parse(char *server_strings);
 207
 208 char *memcached_stat_get_value(memcached_st *ptr, memcached_stat_st *stat,
 209                                char *key, memcached_return *error);
 210 char ** memcached_stat_get_keys(memcached_st *ptr, memcached_stat_st *stat,
 211                                 memcached_return *error);
 212
 213 /* Some personal debugging functions */
 214 #ifdef HAVE_DEBUG
 215 #define WATCHPOINT fprintf(stderr, "\nWATCHPOINT %s:%d (%s)\n", __FILE__, __LINE__,__func__);fflush(stdout);
 216 #define WATCHPOINT_ERROR(A) fprintf(stderr, "\nWATCHPOINT %s:%d %s\n", __FILE__, __LINE__, memcached_strerror(NULL, A));fflush(stdout);
 217 #define WATCHPOINT_STRING(A) fprintf(stderr, "\nWATCHPOINT %s:%d (%s) %s\n", __FILE__, __LINE__,__func__,A);fflush(stdout);
 218 #define WATCHPOINT_NUMBER(A) fprintf(stderr, "\nWATCHPOINT %s:%d (%s) %zu\n", __FILE__, __LINE__,__func__,(size_t)(A));fflush(stdout);
 219 #define WATCHPOINT_ERRNO(A) fprintf(stderr, "\nWATCHPOINT %s:%d (%s) %s\n", __FILE__, __LINE__,__func__, strerror(A));A= 0;fflush(stdout);
 220 #define WATCHPOINT_ASSERT(A) assert((A));
 221 #else
 222 /*
 223 #define WATCHPOINT { 1; };
 224 #define WATCHPOINT_ERROR(A) { 1; };
 225 #define WATCHPOINT_STRING(A) { 1; };
 226 #define WATCHPOINT_NUMBER(A) { 1; };
 227 #define WATCHPOINT_ERRNO(A) { 1; };
 228 #define WATCHPOINT_ASSERT(A) { 1; };
 229 */
 230 #define WATCHPOINT
 231 #define WATCHPOINT_ERROR(A)
 232 #define WATCHPOINT_STRING(A)
 233 #define WATCHPOINT_NUMBER(A)
 234 #define WATCHPOINT_ERRNO(A)
 235 #define WATCHPOINT_ASSERT(A)
 236 #endif
 237
 238
 239 #ifdef __cplusplus
 240 }
 241 #endif
 242
 243 #endif /* __MEMCACHED_H__ */