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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 <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <sys/types.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <netdb.h>
  21 #include <unistd.h>
  22 #include <limits.h>
  23 #include <assert.h>
  24 #include <time.h>
  25 #include <errno.h>
  26
  27 #ifdef __cplusplus
  28 extern "C" {
  29 #endif
  30
  31 typedef struct memcached_st memcached_st;
  32 typedef struct memcached_stat_st memcached_stat_st;
  33 typedef struct memcached_string_st memcached_string_st;
  34 typedef struct memcached_server_st memcached_server_st;
  35
  36 #define MEMCACHED_DEFAULT_PORT 11211
  37 #define MEMCACHED_DEFAULT_COMMAND_SIZE 350
  38 #define SMALL_STRING_LEN 1024
  39 #define HUGE_STRING_LEN 8196
  40 #define MEMCACHED_MAX_KEY 251 /* We add one to have it null terminated */
  41 //#define MEMCACHED_MAX_BUFFER 8196
  42 #define MEMCACHED_MAX_BUFFER 8196
  43
  44 typedef enum {
  45   MEMCACHED_SUCCESS,
  46   MEMCACHED_FAILURE,
  47   MEMCACHED_HOST_LOCKUP_FAILURE,
  48   MEMCACHED_CONNECTION_FAILURE,
  49   MEMCACHED_CONNECTION_BIND_FAILURE,
  50   MEMCACHED_WRITE_FAILURE,
  51   MEMCACHED_READ_FAILURE,
  52   MEMCACHED_UNKNOWN_READ_FAILURE,
  53   MEMCACHED_PROTOCOL_ERROR,
  54   MEMCACHED_CLIENT_ERROR,
  55   MEMCACHED_SERVER_ERROR,
  56   MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE,
  57   MEMCACHED_DATA_EXISTS,
  58   MEMCACHED_DATA_DOES_NOT_EXIST,
  59   MEMCACHED_NOTSTORED,
  60   MEMCACHED_STORED,
  61   MEMCACHED_NOTFOUND,
  62   MEMCACHED_MEMORY_ALLOCATION_FAILURE,
  63   MEMCACHED_PARTIAL_READ,
  64   MEMCACHED_SOME_ERRORS,
  65   MEMCACHED_NO_SERVERS,
  66   MEMCACHED_END,
  67   MEMCACHED_DELETED,
  68   MEMCACHED_VALUE,
  69   MEMCACHED_STAT,
  70   MEMCACHED_ERRNO,
  71   MEMCACHED_MAXIMUM_RETURN, /* Always add new error code before */
  72 } memcached_return;
  73
  74 typedef enum {
  75   MEMCACHED_BEHAVIOR_NO_BLOCK,
  76   MEMCACHED_BEHAVIOR_TCP_NODELAY,
  77   MEMCACHED_BEHAVIOR_MD5_HASHING,
  78   MEMCACHED_BEHAVIOR_KETAMA,
  79 } memcached_behavior;
  80
  81 typedef enum {
  82   MEMCACHED_NOT_ALLOCATED= 0,
  83   MEMCACHED_ALLOCATED= 1,
  84 } memcached_allocated;
  85
  86 struct memcached_server_st {
  87   char *hostname;
  88   unsigned int port;
  89   int fd;
  90   unsigned int stack_responses;
  91 };
  92
  93 struct memcached_stat_st {
  94   unsigned int pid;
  95   unsigned int uptime;
  96   unsigned int threads;
  97   time_t time;
  98   char version[8];
  99   unsigned int pointer_size;
 100   unsigned int rusage_user;
 101   unsigned int rusage_system;
 102   unsigned int rusage_user_seconds;
 103   unsigned int rusage_user_microseconds;
 104   unsigned int rusage_system_seconds;
 105   unsigned int rusage_system_microseconds;
 106   unsigned int curr_items;
 107   unsigned int total_items;
 108   unsigned long long bytes;
 109   unsigned int curr_connections;
 110   unsigned int total_connections;
 111   unsigned int connection_structures;
 112   unsigned long long cmd_get;
 113   unsigned long long cmd_set;
 114   unsigned long long get_hits;
 115   unsigned long long get_misses;
 116   unsigned long long evictions;
 117   unsigned long long bytes_read;
 118   unsigned long long bytes_written;
 119   unsigned int limit_maxbytes;
 120 };
 121
 122 struct memcached_string_st {
 123   char *string;
 124   char *end;
 125   size_t current_size;
 126   size_t block_size;
 127 };
 128
 129 struct memcached_st {
 130   memcached_allocated is_allocated;
 131   memcached_server_st *hosts;
 132   unsigned int number_of_hosts;
 133   unsigned int cursor_server;
 134   char read_buffer[MEMCACHED_MAX_BUFFER];
 135   size_t read_buffer_length;
 136   char *read_ptr;
 137   char write_buffer[MEMCACHED_MAX_BUFFER];
 138   size_t write_buffer_offset;
 139   char connected;
 140   int my_errno;
 141   unsigned long long flags;
 142   memcached_return warning; /* Future Use */
 143 };
 144
 145 /* Public API */
 146 memcached_st *memcached_create(memcached_st *ptr);
 147 void memcached_free(memcached_st *ptr);
 148
 149 memcached_return memcached_delete(memcached_st *ptr, char *key, size_t key_length,
 150                                   time_t expiration);
 151 memcached_return memcached_increment(memcached_st *ptr,
 152                                      char *key, size_t key_length,
 153                                      unsigned int offset,
 154                                      unsigned int *value);
 155 memcached_return memcached_decrement(memcached_st *ptr,
 156                                      char *key, size_t key_length,
 157                                      unsigned int offset,
 158                                      unsigned int *value);
 159 memcached_stat_st *memcached_stat(memcached_st *ptr, char *args, memcached_return *error);
 160 memcached_return memcached_stat_servername(memcached_stat_st *stat, char *args,
 161                                            char *hostname, unsigned int port);
 162 memcached_return memcached_flush(memcached_st *ptr, time_t expiration);
 163 memcached_return memcached_verbosity(memcached_st *ptr, unsigned int verbosity);
 164 void memcached_quit(memcached_st *ptr);
 165 char *memcached_strerror(memcached_st *ptr, memcached_return rc);
 166 memcached_return memcached_behavior_set(memcached_st *ptr, memcached_behavior flag, void *data);
 167 unsigned long long memcached_behavior_get(memcached_st *ptr, memcached_behavior flag);
 168
 169 /* All of the functions for adding data to the server */
 170 memcached_return memcached_set(memcached_st *ptr, char *key, size_t key_length,
 171                                char *value, size_t value_length,
 172                                time_t expiration,
 173                                uint16_t  flags);
 174 memcached_return memcached_add(memcached_st *ptr, char *key, size_t key_length,
 175                                char *value, size_t value_length,
 176                                time_t expiration,
 177                                uint16_t  flags);
 178 memcached_return memcached_replace(memcached_st *ptr, char *key, size_t key_length,
 179                                    char *value, size_t value_length,
 180                                    time_t expiration,
 181                                    uint16_t  flags);
 182
 183 /* Get functions */
 184 char *memcached_get(memcached_st *ptr, char *key, size_t key_length,
 185                     size_t *value_length,
 186                     uint16_t *flags,
 187                     memcached_return *error);
 188 memcached_return memcached_mget(memcached_st *ptr,
 189                                 char **keys, size_t *key_length,
 190                                 unsigned int number_of_keys);
 191 char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length,
 192                       size_t *value_length, uint16_t *flags,
 193                       memcached_return *error);
 194
 195 /* Server Public functions */
 196 #define memcached_server_count(A) A->number_of_hosts
 197 #define memcached_server_name(A,B) B.hostname
 198 #define memcached_server_port(A,B) B.port
 199 #define memcached_server_list(A) A->hosts
 200 #define memcached_server_response_increment(A,B) A->hosts[B].stack_responses++
 201 #define memcached_server_response_decrement(A,B) A->hosts[B].stack_responses--
 202 #define memcached_server_response_count(A,B) A->hosts[B].stack_responses
 203
 204 memcached_return memcached_server_add(memcached_st *ptr, char *hostname,
 205                                       unsigned int port);
 206
 207 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 208                                              char *hostname, unsigned int port,
 209                                              memcached_return *error);
 210 void memcached_server_list_free(memcached_server_st *ptr);
 211 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list);
 212 unsigned int memcached_server_list_count(memcached_server_st *ptr);
 213 memcached_server_st *memcached_servers_parse(char *server_strings);
 214
 215 /* String Struct */
 216 #define memcached_string_length(A, B) (size_t)(B->end - B->string)
 217 #define memcached_string_size(A, B) B->current_size
 218 #define memcached_string_value(A, B) B->string
 219
 220 memcached_string_st *memcached_string_create(memcached_st *ptr, size_t initial_size);
 221 memcached_return memcached_string_append_character(memcached_st *ptr,
 222                                                    memcached_string_st *string,
 223                                                    char character);
 224 memcached_return memcached_string_append(memcached_st *ptr, memcached_string_st *string,
 225                                          char *value, size_t length);
 226 size_t memcached_string_backspace(memcached_st *ptr, memcached_string_st *string, size_t remove);
 227 memcached_return memcached_string_reset(memcached_st *ptr, memcached_string_st *string);
 228 void memcached_string_free(memcached_st *ptr, memcached_string_st *string);
 229
 230 char *memcached_stat_get_value(memcached_st *ptr, memcached_stat_st *stat,
 231                                char *key, memcached_return *error);
 232 char ** memcached_stat_get_keys(memcached_st *ptr, memcached_stat_st *stat,
 233                                 memcached_return *error);
 234
 235 /* Some personal debugging functions */
 236 #define WATCHPOINT printf("\nWATCHPOINT %s:%d (%s)\n", __FILE__, __LINE__,__func__);fflush(stdout);
 237 #define WATCHPOINT_ERROR(A) printf("\nWATCHPOINT %s:%d %s\n", __FILE__, __LINE__, memcached_strerror(NULL, A));fflush(stdout);
 238 #define WATCHPOINT_STRING(A) printf("\nWATCHPOINT %s:%d %s\n", __FILE__, __LINE__, A);fflush(stdout);
 239 #define WATCHPOINT_NUMBER(A) printf("\nWATCHPOINT %s:%d %d\n", __FILE__, __LINE__, A);fflush(stdout);
 240 #define WATCHPOINT_ERRNO(A) printf("\nWATCHPOINT %s:%d %s\n", __FILE__, __LINE__, strerror(A));A= 0;fflush(stdout);
 241
 242
 243 #ifdef __cplusplus
 244 }
 245 #endif
 246
 247 #endif /* __MEMCACHED_H__ */