gistfile1.txt

(DEV) user@host [database]> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: host
                  Master_User: user
                  Master_Port: 3315
                Connect_Retry: 60
              Master_Log_File: filename-bin.000001
          Read_Master_Log_Pos: 1
               Relay_Log_File: filename-relay-bin.000004
                Relay_Log_Pos: 1
        Relay_Master_Log_File: source-bin.000002
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 1
              Relay_Log_Space: 1
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 1
1 row in set (0.00 sec)

ideal.go

type SlaveStatus struct {
    IOState         string `sql:Slave_IO_State`
    MasterHost      string `sql:Master_Host`
    SlaveIORunning  string `sql:Slave_IO_Running`
    SlaveSQLRunning string `sql:Slave_SQL_Running`
}

func read_slave_status(db *sql.DB) (*SlaveStatus, error) {
    rows, err := db.Query("SHOW SLAVE STATUS")
    if err != nil {
        return nil, fmt.Errorf("unable to show slave status: %v", err)
    }
    defer rows.Close()

    var s SlaveStatus
    for rows.Next() {
        if err := rows.Scan(&s); err != nil {
            return nil, fmt.Errorf("unable to scan row: %v", err)
        }
    }
    if err := rows.Err(); err != nil {
        return nil, fmt.Errorf("error reading rows: %v", err)
    }
    return &s, nil
}