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some code for replication awareness support - this is a temporary

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commit - it compiles, and test suite still passes, but it is not finished . The
purpose of the commit is backup/code sharing/code review
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sasha@mysql.sashanet.com
2001-06-02 20:02:43 -06:00
parent ad0b92f941
commit 1d05b89980
2 changed files with 223 additions and 1 deletions
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41
include/mysql.h
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@ -127,6 +127,15 @@ typedef struct st_mysql_data {
struct st_mysql_options {
unsigned int connect_timeout,client_flag;
my_bool compress,named_pipe;
my_bool rpl_probe; /* on connect, find out the replication
role of the server, and establish connections
to all the peers */
my_bool rpl_parse; /* each call to mysql_real_query() will parse
it to tell if it is a read or a write, and
direct it to the slave or the master */
my_bool no_master_reads; /* if set, never read from
a master,only from slave, when doing
a read that is replication-aware */
unsigned int port;
char *host,*init_command,*user,*password,*unix_socket,*db;
char *my_cnf_file,*my_cnf_group, *charset_dir, *charset_name;
@ -168,6 +177,13 @@ typedef struct st_mysql {
char scramble_buff[9];
struct charset_info_st *charset;
unsigned int server_language;
/* pointers to the master, and the next slave
connections, points to itself if lone connection */
struct st_mysql* master, *next_slave;
struct st_mysql* last_used_slave; /* needed for round-robin slave pick */
my_bool is_slave; /* will be false for a lone connection */
} MYSQL;
@ -242,6 +258,31 @@ int STDCALL mysql_send_query(MYSQL *mysql, const char *q,
int STDCALL mysql_read_query_result(MYSQL *mysql);
int STDCALL mysql_real_query(MYSQL *mysql, const char *q,
unsigned int length);
/* perform query on master */
int STDCALL mysql_master_query(MYSQL *mysql, const char *q,
unsigned int length);
/* perform query on slave */
int STDCALL mysql_slave_query(MYSQL *mysql, const char *q,
unsigned int length);
/* enable/disable parsing of all queries to decide
if they go on master or slave */
void STDCALL mysql_enable_rpl_parse(MYSQL* mysql);
void STDCALL mysql_disable_rpl_parse(MYSQL* mysql);
/* get the value of the parse flag */
int STDCALL mysql_rpl_parse_enabled(MYSQL* mysql);
/* enable/disable reads from master */
void STDCALL mysql_enable_reads_from_master(MYSQL* mysql);
void STDCALL mysql_disable_reads_from_master(MYSQL* mysql);
/* get the value of the master read flag */
int STDCALL mysql_reads_from_master_enabled(MYSQL* mysql);
int STDCALL mysql_query_goes_to_master(const char* q, int len);
/* discover the master and its slaves */
int STDCALL mysql_rpl_probe(MYSQL* mysql);
int STDCALL mysql_create_db(MYSQL *mysql, const char *DB);
int STDCALL mysql_drop_db(MYSQL *mysql, const char *DB);
int STDCALL mysql_shutdown(MYSQL *mysql);