### 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 connections.
    """

    def __init__(self):
        self.name = 'mysql5 conn'
        self.nick = ('ThCon', '%Con')
        self.vars = ('Threads_connected', 'Threads')
        self.type = 'f'
        self.width = 4
        self.scale = 1

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

    def extract(self):
        try:
            c = self.db.cursor()
            c.execute("""show global variables like 'max_connections';""")
            max = c.fetchone()
            c.execute("""show global status like 'Threads_connected';""")
            thread = c.fetchone()
            if thread[0] in self.vars:
                self.set2[thread[0]] = float(thread[1])
                self.set2['Threads'] = float(thread[1]) / float(max[1]) * 100.0

            for name in self.vars:
                self.val[name] = self.set2[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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