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Add support for SELECT @@server_id

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This commit is contained in:
Mark Riddoch
2015-02-09 16:07:01 +00:00
parent d190997780
commit 958cc73176
1 changed files with 42 additions and 0 deletions
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42
server/modules/routing/binlog/blr_slave.c
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@ -68,6 +68,7 @@ int blr_slave_callback(DCB *dcb, DCB_REASON reason, void *data);
static int blr_slave_fake_rotate(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave);
static void blr_slave_send_fde(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave);
static int blr_slave_send_maxscale_version(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave);
static int blr_slave_send_server_id(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave);
static int blr_slave_send_maxscale_variables(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave);
static int blr_slave_send_master_status(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave);
static int blr_slave_send_slave_status(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave);
@ -164,6 +165,7 @@ blr_slave_request(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *queue)
* SELECT @@hostname
* SELECT @@max_allowed_packet
* SELECT @@maxscale_version
* SELECT @@server_id
*
* Five show commands are supported:
* SHOW VARIABLES LIKE 'SERVER_ID'
@ -265,6 +267,11 @@ int query_len;
free(query_text);
return blr_slave_send_maxscale_version(router, slave);
}
else if (strcasecmp(word, "@@server_id") == 0)
{
free(query_text);
return blr_slave_send_server_id(router, slave);
}
}
else if (strcasecmp(word, "SHOW") == 0)
{
@ -544,6 +551,41 @@ int len, vers_len;
return blr_slave_send_eof(router, slave, 5);
}
/**
* Send a response the the SQL command SELECT @@server_id
*
* @param router The binlog router instance
* @param slave The slave server to which we are sending the response
* @return Non-zero if data was sent
*/
static int
blr_slave_send_server_id(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave)
{
GWBUF *pkt;
char server_id[40];
uint8_t *ptr;
int len, id_len;
sprintf(server_id, "%d", router->masterid);
id_len = strlen(server_id);
blr_slave_send_fieldcount(router, slave, 1);
blr_slave_send_columndef(router, slave, "SERVER_ID", 0xf, id_len, 2);
blr_slave_send_eof(router, slave, 3);
len = 5 + id_len;
if ((pkt = gwbuf_alloc(len)) == NULL)
return 0;
ptr = GWBUF_DATA(pkt);
encode_value(ptr, id_len + 1, 24); // Add length of data packet
ptr += 3;
*ptr++ = 0x04; // Sequence number in response
*ptr++ = id_len; // Length of result string
strncpy((char *)ptr, server_id, id_len); // Result string
ptr += id_len;
slave->dcb->func.write(slave->dcb, pkt);
return blr_slave_send_eof(router, slave, 5);
}
/**
* Send the response to the SQL command "SHOW VARIABLES LIKE 'MAXSCALE%'