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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
  16 #ifdef __cplusplus
  17 extern "C" {
  18 #endif
  19
  20 typedef struct memcached_st memcached_st;
  21 typedef struct memcached_stat_st memcached_stat_st;
  22 typedef struct memcached_string_st memcached_string_st;
  23 typedef struct memcached_server_st memcached_server_st;
  24
  25 #define MEMCACHED_DEFAULT_PORT 11211
  26 #define MEMCACHED_DEFAULT_COMMAND_SIZE 350
  27 #define SMALL_STRING_LEN 1024
  28 #define HUGE_STRING_LEN 8196
  29 #define MEMCACHED_MAX_KEY 251 /* We add one to have it null terminated */
  30 //#define MEMCACHED_MAX_BUFFER 8196
  31 #define MEMCACHED_MAX_BUFFER HUGE_STRING_LEN*4
  32
  33 typedef enum {
  34   MEMCACHED_SUCCESS,
  35   MEMCACHED_FAILURE,
  36   MEMCACHED_HOST_LOCKUP_FAILURE,
  37   MEMCACHED_CONNECTION_FAILURE,
  38   MEMCACHED_CONNECTION_BIND_FAILURE,
  39   MEMCACHED_WRITE_FAILURE,
  40   MEMCACHED_READ_FAILURE,
  41   MEMCACHED_UNKNOWN_READ_FAILURE,
  42   MEMCACHED_PROTOCOL_ERROR,
  43   MEMCACHED_CLIENT_ERROR,
  44   MEMCACHED_SERVER_ERROR,
  45   MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE,
  46   MEMCACHED_DATA_EXISTS,
  47   MEMCACHED_DATA_DOES_NOT_EXIST,
  48   MEMCACHED_NOTSTORED,
  49   MEMCACHED_STORED,
  50   MEMCACHED_NOTFOUND,
  51   MEMCACHED_MEMORY_ALLOCATION_FAILURE,
  52   MEMCACHED_PARTIAL_READ,
  53   MEMCACHED_SOME_ERRORS,
  54   MEMCACHED_NO_SERVERS,
  55   MEMCACHED_END,
  56   MEMCACHED_DELETED,
  57   MEMCACHED_VALUE,
  58   MEMCACHED_STAT,
  59   MEMCACHED_ERRNO,
  60   MEMCACHED_MAXIMUM_RETURN, /* Always add new error code before */
  61 } memcached_return;
  62
  63 typedef enum {
  64   MEMCACHED_BEHAVIOR_NO_BLOCK,
  65   MEMCACHED_BEHAVIOR_TCP_NODELAY,
  66   MEMCACHED_BEHAVIOR_MD5_HASHING,
  67   MEMCACHED_BEHAVIOR_KETAMA,
  68 } memcached_behavior;
  69
  70 typedef enum {
  71   MEMCACHED_NOT_ALLOCATED= 0,
  72   MEMCACHED_ALLOCATED= 1,
  73 } memcached_allocated;
  74
  75 struct memcached_server_st {
  76   char *hostname;
  77   unsigned int port;
  78   int fd;
  79   unsigned int stack_responses;
  80   unsigned int cursor_active;
  81 };
  82
  83 struct memcached_stat_st {
  84   unsigned int pid;
  85   unsigned int uptime;
  86   unsigned int threads;
  87   time_t time;
  88   char version[8];
  89   unsigned int pointer_size;
  90   unsigned int rusage_user;
  91   unsigned int rusage_system;
  92   unsigned int rusage_user_seconds;
  93   unsigned int rusage_user_microseconds;
  94   unsigned int rusage_system_seconds;
  95   unsigned int rusage_system_microseconds;
  96   unsigned int curr_items;
  97   unsigned int total_items;
  98   unsigned long long bytes;
  99   unsigned int curr_connections;
 100   unsigned int total_connections;
 101   unsigned int connection_structures;
 102   unsigned long long cmd_get;
 103   unsigned long long cmd_set;
 104   unsigned long long get_hits;
 105   unsigned long long get_misses;
 106   unsigned long long evictions;
 107   unsigned long long bytes_read;
 108   unsigned long long bytes_written;
 109   unsigned int limit_maxbytes;
 110 };
 111
 112 struct memcached_string_st {
 113   char *string;
 114   char *end;
 115   size_t current_size;
 116   size_t block_size;
 117 };
 118
 119 struct memcached_st {
 120   memcached_allocated is_allocated;
 121   memcached_server_st *hosts;
 122   unsigned int number_of_hosts;
 123   unsigned int cursor_server;
 124   char read_buffer[MEMCACHED_MAX_BUFFER];
 125   size_t read_buffer_length;
 126   char *read_ptr;
 127   char write_buffer[MEMCACHED_MAX_BUFFER];
 128   size_t write_buffer_offset;
 129   char connected;
 130   int my_errno;
 131   unsigned long long flags;
 132   memcached_return warning; /* Future Use */
 133 };
 134
 135 /* Public API */
 136 memcached_st *memcached_create(memcached_st *ptr);
 137 void memcached_free(memcached_st *ptr);
 138
 139 memcached_return memcached_delete(memcached_st *ptr, char *key, size_t key_length,
 140                                   time_t expiration);
 141 memcached_return memcached_increment(memcached_st *ptr,
 142                                      char *key, size_t key_length,
 143                                      unsigned int offset,
 144                                      unsigned int *value);
 145 memcached_return memcached_decrement(memcached_st *ptr,
 146                                      char *key, size_t key_length,
 147                                      unsigned int offset,
 148                                      unsigned int *value);
 149 memcached_stat_st *memcached_stat(memcached_st *ptr, char *args, memcached_return *error);
 150 memcached_return memcached_stat_servername(memcached_stat_st *stat, char *args,
 151                                            char *hostname, unsigned int port);
 152 memcached_return memcached_flush(memcached_st *ptr, time_t expiration);
 153 memcached_return memcached_verbosity(memcached_st *ptr, unsigned int verbosity);
 154 void memcached_quit(memcached_st *ptr);
 155 char *memcached_strerror(memcached_st *ptr, memcached_return rc);
 156 memcached_return memcached_behavior_set(memcached_st *ptr, memcached_behavior flag, void *data);
 157 unsigned long long memcached_behavior_get(memcached_st *ptr, memcached_behavior flag);
 158
 159 /* All of the functions for adding data to the server */
 160 memcached_return memcached_set(memcached_st *ptr, char *key, size_t key_length,
 161                                char *value, size_t value_length,
 162                                time_t expiration,
 163                                uint16_t  flags);
 164 memcached_return memcached_add(memcached_st *ptr, char *key, size_t key_length,
 165                                char *value, size_t value_length,
 166                                time_t expiration,
 167                                uint16_t  flags);
 168 memcached_return memcached_replace(memcached_st *ptr, char *key, size_t key_length,
 169                                    char *value, size_t value_length,
 170                                    time_t expiration,
 171                                    uint16_t  flags);
 172
 173 /* Get functions */
 174 char *memcached_get(memcached_st *ptr, char *key, size_t key_length,
 175                     size_t *value_length,
 176                     uint16_t *flags,
 177                     memcached_return *error);
 178 memcached_return memcached_mget(memcached_st *ptr,
 179                                 char **keys, size_t *key_length,
 180                                 unsigned int number_of_keys);
 181 char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length,
 182                       size_t *value_length, uint16_t *flags,
 183                       memcached_return *error);
 184
 185 /* Server Public functions */
 186 #define memcached_server_count(A) A->number_of_hosts
 187 #define memcached_server_name(A,B) B.hostname
 188 #define memcached_server_port(A,B) B.port
 189 #define memcached_server_list(A) A->hosts
 190 #define memcached_server_response_count(A,B) A->hosts[B].stack_responses
 191
 192 memcached_return memcached_server_add(memcached_st *ptr, char *hostname,
 193                                       unsigned int port);
 194 void memcached_server_list_free(memcached_server_st *ptr);
 195 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list);
 196
 197 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 198                                              char *hostname, unsigned int port,
 199                                              memcached_return *error);
 200 unsigned int memcached_server_list_count(memcached_server_st *ptr);
 201 memcached_server_st *memcached_servers_parse(char *server_strings);
 202
 203 char *memcached_stat_get_value(memcached_st *ptr, memcached_stat_st *stat,
 204                                char *key, memcached_return *error);
 205 char ** memcached_stat_get_keys(memcached_st *ptr, memcached_stat_st *stat,
 206                                 memcached_return *error);
 207
 208 /* Some personal debugging functions */
 209 #define WATCHPOINT printf("\nWATCHPOINT %s:%d (%s)\n", __FILE__, __LINE__,__func__);fflush(stdout);
 210 #define WATCHPOINT_ERROR(A) printf("\nWATCHPOINT %s:%d %s\n", __FILE__, __LINE__, memcached_strerror(NULL, A));fflush(stdout);
 211 #define WATCHPOINT_STRING(A) printf("\nWATCHPOINT %s:%d (%s) %s\n", __FILE__, __LINE__,__func__,A);fflush(stdout);
 212 #define WATCHPOINT_NUMBER(A) printf("\nWATCHPOINT %s:%d (%s) %d\n", __FILE__, __LINE__,__func__,A);fflush(stdout);
 213 #define WATCHPOINT_ERRNO(A) printf("\nWATCHPOINT %s:%d (%s) %s\n", __FILE__, __LINE__,__func__, strerror(A));A= 0;fflush(stdout);
 214
 215
 216 #ifdef __cplusplus
 217 }
 218 #endif
 219
 220 #endif /* __MEMCACHED_H__ */