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MXS-1703 Move do_show_slave_status() to MariaDBServer

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Also took into use the QueryResult helper class.
This commit is contained in:
Esa Korhonen
2018-03-22 17:43:41 +02:00
parent 6535448374
commit 1d5128fc5b
5 changed files with 174 additions and 180 deletions
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162
server/modules/monitor/mariadbmon/mariadbserver.cc
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@ -130,4 +130,164 @@ std::auto_ptr<QueryResult> MariaDBServer::execute_query(const string& query)
mon_report_query_error(server_base);
}
return rval;
}
}
bool MariaDBServer::do_show_slave_status(int64_t gtid_domain)
{
/** Column positions for SHOW SLAVE STATUS */
const size_t MYSQL55_STATUS_MASTER_LOG_POS = 5;
const size_t MYSQL55_STATUS_MASTER_LOG_FILE = 6;
const size_t MYSQL55_STATUS_IO_RUNNING = 10;
const size_t MYSQL55_STATUS_SQL_RUNNING = 11;
const size_t MYSQL55_STATUS_MASTER_ID = 39;
bool rval = true;
unsigned int columns;
int i_slave_io_running, i_slave_sql_running, i_read_master_log_pos, i_master_server_id, i_master_log_file;
int i_last_io_errno, i_last_io_error, i_last_sql_error, i_slave_rec_hbs, i_slave_hb_period;
int i_master_host, i_master_port, i_using_gtid, i_gtid_io_pos;
const char *query;
mysql_server_version server_version = version;
if (server_version == MYSQL_SERVER_VERSION_100)
{
columns = 42;
query = "SHOW ALL SLAVES STATUS";
}
else
{
columns = server_version == MYSQL_SERVER_VERSION_55 ? 40 : 38;
query = "SHOW SLAVE STATUS";
i_slave_io_running = MYSQL55_STATUS_IO_RUNNING;
i_slave_sql_running = MYSQL55_STATUS_SQL_RUNNING;
i_master_log_file = MYSQL55_STATUS_MASTER_LOG_FILE;
i_read_master_log_pos = MYSQL55_STATUS_MASTER_LOG_POS;
i_master_server_id = MYSQL55_STATUS_MASTER_ID;
}
int64_t master_server_id = SERVER_ID_UNKNOWN;
int nconfigured = 0;
int nrunning = 0;
auto result = execute_query(query);
if (result.get() == NULL)
{
return false;
}
else if(result->get_column_count() < columns)
{
MXS_ERROR("\"%s\" returned less than the expected amount of columns. "
"Expected %u columns.", query, columns);
return false;
}
if (server_version == MYSQL_SERVER_VERSION_100)
{
i_slave_io_running = result->get_col_index("Slave_IO_Running");
i_slave_sql_running = result->get_col_index("Slave_SQL_Running");
i_master_log_file = result->get_col_index("Master_Log_File");
i_read_master_log_pos = result->get_col_index("Read_Master_Log_Pos");
i_master_server_id = result->get_col_index("Master_Server_Id");
i_slave_rec_hbs = result->get_col_index("Slave_received_heartbeats");
i_slave_hb_period = result->get_col_index("Slave_heartbeat_period");
i_master_host = result->get_col_index("Master_Host");
i_master_port = result->get_col_index("Master_Port");
i_using_gtid = result->get_col_index("Using_Gtid");
i_gtid_io_pos = result->get_col_index("Gtid_IO_Pos");
i_last_io_errno = result->get_col_index("Last_IO_Errno");
i_last_io_error = result->get_col_index("Last_IO_Error");
i_last_sql_error = result->get_col_index("Last_SQL_Error");
}
// TODO: Add other versions here once it's certain the column names are the same. Better yet, save the
// indexes to object data so they don't need to be updated every query.
while (result->next_row())
{
nconfigured++;
/* get Slave_IO_Running and Slave_SQL_Running values*/
slave_status.slave_io_running = (result->get_string(i_slave_io_running) == "Yes");
slave_status.slave_sql_running = (result->get_string(i_slave_sql_running) == "Yes");
if (slave_status.slave_io_running && slave_status.slave_sql_running)
{
if (nrunning == 0)
{
/** Only check binlog name for the first running slave */
string master_log_file = result->get_string(i_master_log_file);
uint64_t read_master_log_pos = result->get_int(i_read_master_log_pos);
if (slave_status.master_log_file != master_log_file ||
slave_status.read_master_log_pos != read_master_log_pos)
{
// IO thread is reading events from the master
latest_event = time(NULL);
}
slave_status.master_log_file = master_log_file;
slave_status.read_master_log_pos = read_master_log_pos;
}
nrunning++;
}
/* If Slave_IO_Running = Yes, assign the master_id to current server: this allows building
* the replication tree, slaves ids will be added to master(s) and we will have at least the
* root master server.
* Please note, there could be no slaves at all if Slave_SQL_Running == 'No'
*/
int64_t last_io_errno = result->get_int(i_last_io_errno);
int io_errno = last_io_errno;
const int connection_errno = 2003;
if ((io_errno == 0 || io_errno == connection_errno) &&
server_version != MYSQL_SERVER_VERSION_51)
{
/* Get Master_Server_Id */
master_server_id = scan_server_id(result->get_string(i_master_server_id).c_str());
}
if (server_version == MYSQL_SERVER_VERSION_100)
{
slave_status.master_host = result->get_string(i_master_host);
slave_status.master_port = result->get_int(i_master_port);
string last_io_error = result->get_string(i_last_io_error);
string last_sql_error = result->get_string(i_last_sql_error);
slave_status.last_error = !last_io_error.empty() ? last_io_error : last_sql_error;
int heartbeats = result->get_int(i_slave_rec_hbs);
if (slave_heartbeats < heartbeats)
{
latest_event = time(NULL);
slave_heartbeats = heartbeats;
heartbeat_period = result->get_int(i_slave_hb_period);
}
string using_gtid = result->get_string(i_using_gtid);
if (gtid_domain >= 0 && (using_gtid == "Current_Pos" || using_gtid == "Slave_Pos"))
{
string gtid_io_pos = result->get_string(i_gtid_io_pos);
slave_status.gtid_io_pos = !gtid_io_pos.empty() ?
Gtid(gtid_io_pos.c_str(), gtid_domain) : Gtid();
}
else
{
slave_status.gtid_io_pos = Gtid();
}
}
}
if (nconfigured > 0)
{
slave_configured = true;
}
else
{
/** Query returned no rows, replication is not configured */
slave_configured = false;
slave_heartbeats = 0;
slave_status = SlaveStatusInfo();
}
slave_status.master_server_id = master_server_id;
n_slaves_configured = nconfigured;
n_slaves_running = nrunning;
return rval;
}