TestON/drivers/component.py

#!/usr/bin/env python
import logging
"""
Created on 24-Oct-2012

author:s: Anil Kumar ( anilkumar.s@paxterrasolutions.com ),
          Raghav Kashyap( raghavkashyap@paxterrasolutions.com )


    TestON is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    ( at your option ) any later version.

    TestON is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with TestON.  If not, see <http://www.gnu.org/licenses/>.



"""

class Component( object ):

    """
    This is the tempalte class for components
    """
    def __init__( self ):
        self.default = ''
        self.wrapped = sys.modules[ __name__ ]
        self.count = 0

    def __getattr__( self, name ):
        """
         This will invoke, if the attribute wasn't found the usual ways.
         Here it will look for assert_attribute and will execute when
         AttributeError occurs.
         It will return the result of the assert_attribute.
        """
        try:
            return getattr( self.wrapped, name )
        except AttributeError as error:
            # NOTE: The first time we load a driver module we get this error
            if "'module' object has no attribute '__path__'" in error\
                    and self.count == 0:
                self.count += 1
            else:
                main.log.error( str(error.__class__) + " " + str(error) )
            try:
                def experimentHandling( *args, **kwargs ):
                    if main.EXPERIMENTAL_MODE == main.TRUE:
                        result = self.experimentRun( *args, **kwargs )
                        main.log.info( "EXPERIMENTAL MODE. API " +
                                       str( name ) +
                                       " not yet implemented. " +
                                       "Returning dummy values" )
                        return result
                    else:
                        return main.FALSE
                return experimentHandling
            except TypeError as e:
                main.log.error( "Arguments for experimental mode does not" +
                                " have key 'retruns'" + e )

    def connect( self ):

        vars( main )[ self.name + 'log' ] = logging.getLogger( self.name )

        session_file = main.logdir + "/" + self.name + ".session"
        self.log_handler = logging.FileHandler( session_file )
        self.log_handler.setLevel( logging.DEBUG )

        vars( main )[ self.name + 'log' ].setLevel( logging.DEBUG )
        _formatter = logging.Formatter(
            "%(asctime)s  %(name)-10s: %(levelname)-8s: %(message)s" )
        self.log_handler.setFormatter( _formatter )
        vars( main )[ self.name + 'log' ].addHandler( self.log_handler )
        # Adding header for the component log
        vars( main )[ self.name + 'log' ].info( main.logHeader )
        # Opening the session log to append command's execution output
        self.logfile_handler = open( session_file, "a" )

        return "Dummy"

    def execute( self, cmd ):
        return main.TRUE
        # import commands
        # return commands.getoutput( cmd )

    def disconnect( self ):
        return main.TRUE

    def config( self ):
        self = self
        # Need to update the configuration code

    def cleanup( self ):
        return main.TRUE

    def log( self, message ):
        """
        Here finding the for the component to which the
        log message based on the called child object.
        """
        vars( main )[ self.name + 'log' ].info( "\n" + message + "\n" )

    def close_log_handles( self ):
        vars( main )[ self.name + 'log' ].removeHandler( self.log_handler )
        if self.logfile_handler:
            self.logfile_handler.close()

    def get_version( self ):
        return "Version unknown"

    def experimentRun( self, *args, **kwargs ):
        # FIXME handle *args
        args = utilities.parse_args( [ "RETURNS" ], **kwargs )
        return args[ "RETURNS" ]


if __name__ != "__main__":
    import sys
    sys.modules[ __name__ ] = Component()