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Add support for:

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select @@maxscale_version;
	show variables like "maxscale%"
	show master status
	show slave hosts
This commit is contained in:
Mark Riddoch
2015-02-03 17:14:37 +00:00
parent 048467b447
commit e9af90e4b6
1 changed files with 288 additions and 4 deletions
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290
server/modules/routing/binlog/blr_slave.c
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@ -52,6 +52,7 @@
#include <skygw_types.h>
#include <skygw_utils.h>
#include <log_manager.h>
#include <version.h>
static uint32_t extract_field(uint8_t *src, int bits);
static void encode_value(unsigned char *data, unsigned int value, int len);
@ -66,6 +67,13 @@ uint8_t *blr_build_header(GWBUF *pkt, REP_HEADER *hdr);
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_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_hosts(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave);
static int blr_slave_send_fieldcount(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int count);
static int blr_slave_send_columndef(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *name, int type, int len, uint8_t seqno);
static int blr_slave_send_eof(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int seqno);
extern int lm_enabled_logfiles_bitmask;
extern size_t log_ses_count[];
@ -141,6 +149,10 @@ blr_slave_request(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *queue)
* when MaxScale registered as a slave. The exception to the rule is the
* request to obtain the current timestamp value of the server.
*
* The original set added for the registration process has been enhanced in
* order to support some commands that are useful for monitoring the binlog
* router.
*
* Eight select statements are currently supported:
* SELECT UNIX_TIMESTAMP();
* SELECT @master_binlog_checksum
@ -150,10 +162,14 @@ blr_slave_request(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *queue)
* SELECT @@version_comment limit 1
* SELECT @@hostname
* SELECT @@max_allowed_packet
* SELECT @@maxscale_version
*
* Two show commands are supported:
* Five show commands are supported:
* SHOW VARIABLES LIKE 'SERVER_ID'
* SHOW VARIABLES LIKE 'SERVER_UUID'
* SHOW VARIABLES LIKE 'MAXSCALE%
* SHOW MASTER STATUS
* SHOW SLAVE HOSTS
*
* Five set commands are supported:
* SET @master_binlog_checksum = @@global.binlog_checksum
@ -243,6 +259,11 @@ int query_len;
free(query_text);
return blr_slave_replay(router, slave, router->saved_master.map);
}
else if (strcasecmp(word, "@@maxscale_version") == 0)
{
free(query_text);
return blr_slave_send_maxscale_version(router, slave);
}
}
else if (strcasecmp(word, "SHOW") == 0)
{
@ -277,6 +298,44 @@ int query_len;
free(query_text);
return blr_slave_replay(router, slave, router->saved_master.uuid);
}
else if (strcasecmp(word, "'MAXSCALE%'") == 0)
{
free(query_text);
return blr_slave_send_maxscale_variables(router, slave);
}
}
}
else if (strcasecmp(word, "MASTER") == 0)
{
if ((word = strtok_r(NULL, sep, &brkb)) == NULL)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"%s: Expected SHOW MASTER STATUS command",
router->service->name)));
}
else if (strcasecmp(word, "STATUS") == 0)
{
free(query_text);
return blr_slave_send_master_status(router, slave);
}
}
else if (strcasecmp(word, "SLAVE") == 0)
{
if ((word = strtok_r(NULL, sep, &brkb)) == NULL)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR,
"%s: Expected SHOW MASTER STATUS command",
router->service->name)));
}
else if (strcasecmp(word, "STATUS") == 0)
{
free(query_text);
return blr_slave_send_master_status(router, slave);
}
else if (strcasecmp(word, "HOSTS") == 0)
{
free(query_text);
return blr_slave_send_slave_hosts(router, slave);
}
}
}
@ -449,6 +508,203 @@ int len, ts_len;
return slave->dcb->func.write(slave->dcb, pkt);
}
/**
* Send a response the the SQL command SELECT @@MAXSCALE_VERSION
*
* @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_maxscale_version(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave)
{
GWBUF *pkt;
char version[40];
uint8_t *ptr;
int len, vers_len;
sprintf(version, "%s", MAXSCALE_VERSION);
vers_len = strlen(version);
blr_slave_send_fieldcount(router, slave, 1);
blr_slave_send_columndef(router, slave, "MAXSCALE_VERSION", 0xf, vers_len, 2);
blr_slave_send_eof(router, slave, 3);
len = 5 + vers_len;
if ((pkt = gwbuf_alloc(len)) == NULL)
return 0;
ptr = GWBUF_DATA(pkt);
encode_value(ptr, vers_len + 1, 24); // Add length of data packet
ptr += 3;
*ptr++ = 0x04; // Sequence number in response
*ptr++ = vers_len; // Length of result string
strncpy((char *)ptr, version, vers_len); // Result string
ptr += vers_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%'
*
* @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_maxscale_variables(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave)
{
GWBUF *pkt;
char name[40];
char version[40];
uint8_t *ptr;
int len, vers_len, seqno = 2;
blr_slave_send_fieldcount(router, slave, 2);
blr_slave_send_columndef(router, slave, "Variable_name", 0xf, 40, seqno++);
blr_slave_send_columndef(router, slave, "value", 0xf, 40, seqno++);
blr_slave_send_eof(router, slave, seqno++);
sprintf(version, "%s", MAXSCALE_VERSION);
vers_len = strlen(version);
strcpy(name, "MAXSCALE_VERSION");
len = 5 + vers_len + strlen(name) + 1;
if ((pkt = gwbuf_alloc(len)) == NULL)
return 0;
ptr = GWBUF_DATA(pkt);
encode_value(ptr, vers_len + 2 + strlen(name), 24); // Add length of data packet
ptr += 3;
*ptr++ = seqno++; // Sequence number in response
*ptr++ = strlen(name); // Length of result string
strncpy((char *)ptr, name, strlen(name)); // Result string
ptr += strlen(name);
*ptr++ = vers_len; // Length of result string
strncpy((char *)ptr, version, vers_len); // Result string
ptr += vers_len;
slave->dcb->func.write(slave->dcb, pkt);
return blr_slave_send_eof(router, slave, seqno++);
}
/**
* Send the response to the SQL command "SHOW MASTER STATUS"
*
* @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_master_status(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave)
{
GWBUF *pkt;
char file[40];
char position[40];
uint8_t *ptr;
int len, file_len;
blr_slave_send_fieldcount(router, slave, 5);
blr_slave_send_columndef(router, slave, "File", 0xf, 40, 2);
blr_slave_send_columndef(router, slave, "Position", 0xf, 40, 3);
blr_slave_send_columndef(router, slave, "Binlog_Do_DB", 0xf, 40, 4);
blr_slave_send_columndef(router, slave, "Binlog_Ignore_DB", 0xf, 40, 5);
blr_slave_send_columndef(router, slave, "Execute_Gtid_Set", 0xf, 40, 6);
blr_slave_send_eof(router, slave, 7);
sprintf(file, "%s", router->binlog_name);
file_len = strlen(file);
sprintf(position, "%d", router->binlog_position);
len = 5 + file_len + strlen(position) + 1 + 3;
if ((pkt = gwbuf_alloc(len)) == NULL)
return 0;
ptr = GWBUF_DATA(pkt);
encode_value(ptr, len - 4, 24); // Add length of data packet
ptr += 3;
*ptr++ = 0x08; // Sequence number in response
*ptr++ = strlen(file); // Length of result string
strncpy((char *)ptr, file, strlen(file)); // Result string
ptr += strlen(file);
*ptr++ = strlen(position); // Length of result string
strncpy((char *)ptr, position, strlen(position)); // Result string
ptr += strlen(position);
*ptr++ = 0; // Send 3 empty values
*ptr++ = 0;
*ptr++ = 0;
slave->dcb->func.write(slave->dcb, pkt);
return blr_slave_send_eof(router, slave, 9);
}
/**
* Send the response to the SQL command "SHOW SLAVE HOSTS"
*
* @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_slave_hosts(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave)
{
GWBUF *pkt;
char server_id[40];
char host[40];
char port[40];
char master_id[40];
char slave_uuid[40];
uint8_t *ptr;
int len, seqno;
ROUTER_SLAVE *sptr;
blr_slave_send_fieldcount(router, slave, 5);
blr_slave_send_columndef(router, slave, "Server_id", 0xf, 40, 2);
blr_slave_send_columndef(router, slave, "Host", 0xf, 40, 3);
blr_slave_send_columndef(router, slave, "Port", 0xf, 40, 4);
blr_slave_send_columndef(router, slave, "Master_id", 0xf, 40, 5);
blr_slave_send_columndef(router, slave, "Slave_UUID", 0xf, 40, 6);
blr_slave_send_eof(router, slave, 7);
seqno = 8;
spinlock_acquire(&router->lock);
sptr = router->slaves;
while (sptr)
{
if (sptr->state != 0)
{
sprintf(server_id, "%d", sptr->serverid);
sprintf(host, "%s", sptr->hostname ? sptr->hostname : "");
sprintf(port, "%d", sptr->port);
sprintf(master_id, "%d", router->serverid);
sprintf(slave_uuid, "%s", sptr->uuid);
len = 5 + strlen(server_id) + strlen(host) + strlen(port)
+ strlen(master_id) + strlen(slave_uuid) + 5;
if ((pkt = gwbuf_alloc(len)) == NULL)
return 0;
ptr = GWBUF_DATA(pkt);
encode_value(ptr, len - 4, 24); // Add length of data packet
ptr += 3;
*ptr++ = seqno++; // Sequence number in response
*ptr++ = strlen(server_id); // Length of result string
strncpy((char *)ptr, server_id, strlen(server_id)); // Result string
ptr += strlen(server_id);
*ptr++ = strlen(host); // Length of result string
strncpy((char *)ptr, host, strlen(host)); // Result string
ptr += strlen(host);
*ptr++ = strlen(port); // Length of result string
strncpy((char *)ptr, port, strlen(port)); // Result string
ptr += strlen(port);
*ptr++ = strlen(master_id); // Length of result string
strncpy((char *)ptr, master_id, strlen(master_id)); // Result string
ptr += strlen(master_id);
*ptr++ = strlen(slave_uuid); // Length of result string
strncpy((char *)ptr, slave_uuid, strlen(slave_uuid)); // Result string
ptr += strlen(slave_uuid);
slave->dcb->func.write(slave->dcb, pkt);
}
sptr = sptr->next;
}
spinlock_release(&router->lock);
return blr_slave_send_eof(router, slave, seqno);
}
/**
* Process a slave replication registration message.
*
@ -722,7 +978,7 @@ uint8_t *ptr;
* call. The paramter "long" control the number of events in the burst. The
* short burst is intended to be used when the master receive an event and
* needs to put the slave into catchup mode. This prevents the slave taking
* too much tiem away from the thread that is processing the master events.
* too much time away from the thread that is processing the master events.
*
* At the end of the burst a fake EPOLLOUT event is added to the poll event
* queue. This ensures that the slave callback for processing DCB write drain
@ -1184,7 +1440,7 @@ uint8_t *ptr;
*ptr++ = 'e';
*ptr++ = 'f';
*ptr++ = 0; // Schema name length
*ptr++ = 0; // virtal table name length
*ptr++ = 0; // virtual table name length
*ptr++ = 0; // Table name length
*ptr++ = strlen(name); // Column name length;
while (*name)
@ -1206,3 +1462,31 @@ uint8_t *ptr;
*ptr++= 0;
return slave->dcb->func.write(slave->dcb, pkt);
}
/**
* Send an EOF packet in a response packet sequence.
*
* @param router The router
* @param slave The slave connection
* @param seqno The sequence number of the EOF packet
* @return Non-zero on success
*/
static int
blr_slave_send_eof(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int seqno)
{
GWBUF *pkt;
uint8_t *ptr;
if ((pkt = gwbuf_alloc(9)) == NULL)
return 0;
ptr = GWBUF_DATA(pkt);
encode_value(ptr, 5, 24); // Add length of data packet
ptr += 3;
*ptr++ = seqno; // Sequence number in response
*ptr++ = 0xfe; // Length of result string
encode_value(ptr, 0, 16); // No errors
ptr += 2;
encode_value(ptr, 2, 16); // Autocommit enabled
return slave->dcb->func.write(slave->dcb, pkt);
}