dstat_mysql5_io.py

### Author: <lefred$inuits,be>

global mysql_user
mysql_user = os.getenv('DSTAT_MYSQL_USER') or os.getenv('USER')

global mysql_pwd
mysql_pwd = os.getenv('DSTAT_MYSQL_PWD')

class dstat_plugin(dstat):
    """
    Plugin for MySQL 5 I/O.
    """

    def __init__(self):
        self.name = 'mysql5 io'
        self.nick = ('recv', 'sent')
        self.vars = ('Bytes_received', 'Bytes_sent')

    def check(self): 
        global MySQLdb
        import MySQLdb
        try:
            self.db = MySQLdb.connect(user=mysql_user, passwd=mysql_pwd)
        except:
            raise Exception, 'Cannot interface with MySQL server'

    def extract(self):
        try:
            c = self.db.cursor()
            c.execute("""show global status like 'Bytes_%';""")
            lines = c.fetchall()
            for line in lines:
                if len(line[1]) < 2: continue
                if line[0] in self.vars:
                    self.set2[line[0]] = float(line[1])

            for name in self.vars:
                self.val[name] = (self.set2[name] - self.set1[name]) * 1.0 / elapsed

            if step == op.delay:
                self.set1.update(self.set2)

        except Exception, e:
            for name in self.vars:
                self.val[name] = -1

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