TestON/core/teston.py

#!/usr/bin/env python
'''
Created on 22-Oct-2012
Copyright 2012 Open Networking Foundation (ONF)

Please refer questions to either the onos test mailing list at <onos-test@onosproject.org>,
the System Testing Plans and Results wiki page at <https://wiki.onosproject.org/x/voMg>,
or the System Testing Guide page at <https://wiki.onosproject.org/x/WYQg>

    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/>.



teston is the main module.

'''

import sys
import getpass
import os
import re
import __builtin__
import new
import xmldict
import importlib
import threading
import pdb
module = new.module( "test" )
import openspeak
import subprocess
global path, drivers_path, core_path, tests_path, logs_path
location = os.path.abspath( os.path.dirname( __file__ ) )
path = re.sub( "(core|bin)$", "", location )
drivers_path = path + "drivers"
core_path = path + "core"
tests_path = path + "tests"
logs_path = path + "logs/"
config_path = path + "config/"
sys.path.append( path )
sys.path.append( drivers_path )
sys.path.append( core_path )
sys.path.append( tests_path )

from core.utilities import Utilities
from core.Thread import Thread

class SkipCase( Exception ):
    pass

class TestON:
    '''
    TestON will initiate the specified test.
    The main tasks are:
    * Initiate the required Component handles for the test.
    * Create Log file  Handles.
    '''
    def __init__( self, options ):
        '''
           Initialise the component handles specified in the topology file of
           the specified test.
        '''
        # Initialization of the variables.
        __builtin__.main = self
        __builtin__.path = path
        __builtin__.utilities = Utilities()
        self.TRUE = 1
        self.FALSE = 0
        self.ERROR = -1
        self.NORESULT = 2
        self.FAIL = False
        self.PASS = True
        self.CASERESULT = self.ERROR
        self.STEPRESULT = self.NORESULT
        self.init_result = self.TRUE
        self.testResult = "Summary"
        self.stepName = ""
        self.stepCache = ""
        self.EXPERIMENTAL_MODE = False
        self.test_target = None
        self.lastcommand = None
        self.testDir = tests_path
        self.testsRoot = tests_path
        self.configFile = config_path + "teston.cfg"
        self.parsingClass = "xmlparser"
        self.parserPath = core_path + "/xmlparser"
        self.loggerPath = core_path + "/logger"
        self.loggerClass = "Logger"
        self.logs_path = logs_path
        self.driver = ''
        self.Thread = Thread
        self.cleanupFlag = False
        self.cleanupLock = threading.Lock()
        self.initiated = False
        self.executedCase = []
        self.leftCase = []
        self.failedCase = []
        self.noResultCase = []

        self.config = self.configparser()
        verifyOptions( options )
        load_logger()
        self.componentDictionary = {}
        self.componentDictionary = self.topology[ 'COMPONENT' ]
        self.driversList = []
        if isinstance( self.componentDictionary, str ):
            self.componentDictionary = dict( self.componentDictionary )

        for component in self.componentDictionary:
            self.driversList.append( self.componentDictionary[ component ][ 'type' ] )

        self.driversList = list( set( self.driversList ) )  # Removing duplicates.
        # Checking the test_target option set for the component or not
        if isinstance( self.componentDictionary, dict ):
            for component in self.componentDictionary.keys():
                if 'test_target' in self.componentDictionary[ component ].keys():
                    self.test_target = component

        # Checking for the openspeak file and test script
        self.logger.initlog( self )

        # Creating Drivers Handles
        initString = "\n" + "*" * 30 + "\n CASE INIT \n" + "*" * 30 + "\n"
        self.log.exact( initString )
        self.driverObject = {}
        self.random_order = 111  # Random order id to connect the components
        components_connect_order = {}
        if isinstance( self.componentDictionary, dict ):
            for component in self.componentDictionary.keys():
                if 'connect_order' not in self.componentDictionary[ component ].keys():
                    self.componentDictionary[ component ][ 'connect_order' ] = str( self.get_random() )
                components_connect_order[ component ] = eval( self.componentDictionary[ component ][ 'connect_order' ] )
            # Ordering components based on the connect order.
            ordered_component_list = sorted( components_connect_order,
                                             key=lambda key: components_connect_order[ key ] )
            print ordered_component_list
            for component in ordered_component_list:
                self.componentInit( component )

    def configparser( self ):
        '''
        It will parse the config file (teston.cfg) and return as dictionary
        '''
        matchFileName = re.match( r'(.*)\.cfg', self.configFile, re.M | re.I )
        if matchFileName:
            xml = open( self.configFile ).read()
            try:
                self.configDict = xmldict.xml_to_dict( xml )
                return self.configDict
            except IOError:
                print "There is no such file to parse " + self.configFile
        else:
            print "There is no such file to parse " + self.configFile

    def componentInit( self, component ):
        '''
        This method will initialize specified component
        '''
        global driver_options
        self.initiated = False
        self.log.info( "Creating component handle: " + component )
        driver_options = {}
        if 'COMPONENTS' in self.componentDictionary[ component ].keys():
            driver_options = dict( self.componentDictionary[ component ][ 'COMPONENTS' ] )
        driver_options[ 'name' ] = component
        driverName = self.componentDictionary[ component ][ 'type' ]
        driver_options[ 'type' ] = driverName
        driver_home = self.componentDictionary[ component ].get( 'home' )
        if driver_home:
            driver_options[ 'home' ] = driver_home

        classPath = self.getDriverPath( driverName.lower() )
        driverModule = importlib.import_module( classPath )
        driverClass = getattr( driverModule, driverName )
        driverObject = driverClass()

        if "OCN" in self.componentDictionary[ component ][ 'host' ] and\
           main.onoscell:
            self.componentDictionary[ component ][ 'host' ] = main.mnIP

        user_name = self.componentDictionary[ component ].get( 'user', getpass.getuser() )
        ip_address = self.componentDictionary[ component ].get( 'host', 'localhost' )
        pwd = self.componentDictionary[ component ].get( 'password', 'changeme' )
        port = self.componentDictionary[ component ].get( 'port' )
        connect_result = driverObject.connect( user_name=user_name,
                                               ip_address=ip_address,
                                               pwd=pwd,
                                               port=port,
                                               options=driver_options )

        if not connect_result:
            self.log.error( "Exiting from the test execution because connecting to the " +
                            component + " component failed." )
            self.exit()

        vars( self )[ component ] = driverObject
        self.initiated = True
        return driverObject

    def run( self ):
        '''
           The Execution of the test script's cases listed in the Test params
           file will be done here then update each test case result.
           This method will return main.TRUE if it executed all the test cases
           successfully, else will retun main.FALSE
        '''
        self.testCaseResult = {}
        self.TOTAL_TC = 0
        self.TOTAL_TC_RUN = 0
        self.TOTAL_TC_PLANNED = 0
        self.TOTAL_TC_NORESULT = 0
        self.TOTAL_TC_FAIL = 0
        self.TOTAL_TC_PASS = 0
        self.TEST_ITERATION = 0

        # NOTE: number of main.step statements in the
        #       outer most level of the test case. used to
        #       execute code in smaller steps
        self.stepCount = 0
        self.CASERESULT = self.NORESULT

        import testparser
        test = testparser.TestParser( main.testFile )
        self.testscript = test.testscript
        self.code = test.getStepCode()
        repeat = int( self.params.get( 'repeat', 1 ) )
        self.TOTAL_TC_PLANNED = len( self.testcases_list ) * repeat
        self.log.TAP( "1..%s" % self.TOTAL_TC_PLANNED )

        result = self.TRUE
        while repeat:
            self.leftCase.extend( self.testcases_list )
            for self.CurrentTestCaseNumber in self.testcases_list:
                self.executedCase.append( self.leftCase.pop( 0 ) )
                result = self.runCase( self.CurrentTestCaseNumber )
            repeat -= 1
        return result

    def runCase( self, testCaseNumber ):
        self.CurrentTestCaseNumber = testCaseNumber
        self.CurrentTestCase = ""

        # List of step results in a case. ANDed together to get the result
        self.stepResultsList = []
        self.stepName = ""
        self.caseExplanation = ""
        self.CASERESULT = self.ERROR
        self.STEPRESULT = self.NORESULT
        result = self.TRUE

        # NOTE: number of main.step statements in the
        #       outer most level of the test case. used to
        #       execute code in smaller steps
        self.stepCount = 0

        # NOTE: This is the current number of main.step()'s executed
        #       in a case. Used for logging.
        self.stepNumber = 0
        self.EXPERIMENTAL_MODE = self.FALSE
        self.addCaseHeader()
        self.log.debug( "Case Executed       : " + str( self.executedCase ) )
        self.log.debug( "Case to be executed : " + str( self.leftCase ) )
        self.testCaseNumber = str( testCaseNumber )
        self.CASERESULT = self.NORESULT
        stopped = False
        try:
            self.code[ self.testCaseNumber ]
        except KeyError:
            self.log.error( "There is no Test-Case " + self.testCaseNumber )
            return self.FALSE
        self.stepCount = 0
        while self.stepCount < len( self.code[ self.testCaseNumber ].keys() ):
            result = self.runStep( self.code, self.testCaseNumber )
            if result == self.FALSE:
                break
            elif result == self.TRUE:
                continue
        # stepResults format: ( stepNo[], stepName[], stepResult[], onFail[] )
        stepResults = self.stepResultsList
        if not stopped:
            if self.CASERESULT == self.TRUE or self.CASERESULT == self.FALSE:
                # Result was already explitily set somewhere else like
                # in skipCase()
                pass
            elif all( self.TRUE == i for i in stepResults ):
                # ALL PASSED
                self.CASERESULT = self.TRUE
            elif self.FALSE in stepResults:
                # AT LEAST ONE FAILED
                self.CASERESULT = self.FALSE
            elif self.TRUE in stepResults:
                # AT LEAST ONE PASSED
                self.CASERESULT = self.TRUE
            else:
                self.CASERESULT = self.NORESULT
            self.testCaseResult[ str( self.CurrentTestCaseNumber ) ] = self.CASERESULT
            self.organizeResult( self.CurrentTestCaseNumber, self.CASERESULT )
            self.logger.updateCaseResults( self )
            self.log.summary( self.caseExplanation )
            self.log.summary( self.stepCache )
            self.caseResultsWiki()
            self.caseResultsTAP()
            self.stepCache = ""
        return result

    def caseResultsWiki( self ):
        """
        Add case results to the wiki results file
        """
        self.log.wiki( "<p>" + self.caseExplanation + "</p>" )
        self.log.wiki( "<ul>" )
        subcaseMessage = False
        for line in self.stepCache.splitlines():
            if re.search( "[0-9]\.[0-9]", line ):  # Step
                if subcaseMessage:  # End of Failure Message Printout
                    self.log.wiki( "</ul>\n" )
                    subcaseMessage = False
                if re.search( " - PASS$", line ):
                    self.log.wiki( "<li>" + line + "  <ac:emoticon ac:name=\"tick\" /></li>\n" )
                elif re.search( " - FAIL$", line ):
                    self.log.wiki( "<li>" + line + "  <ac:emoticon ac:name=\"cross\" /></li>\n" )
                elif re.search( " - No Result$", line ):
                    self.log.wiki( "<li>" + line + "  <ac:emoticon ac:name=\"warning\" /></li>\n" )
            else:  # Substep
                if not subcaseMessage:  # Open Failure Message Printout
                    self.log.wiki( "<ul><li>" + line + "</li>\n" )
                    subcaseMessage = True
                else:  # Add to Failure Message Printout
                    self.log.wiki( "<li>" + line + "</li>\n" )
        if subcaseMessage:  # End of Failure Message Printout for last item
            self.log.wiki( "</ul>\n" )
        self.log.wiki( "</ul>" )

    def caseResultsTAP( self ):
        """
        Add case results to the TAP results file
        """
        main.log.debug( self.stepCache )
        steps = 0
        stepLines = []
        for line in self.stepCache.splitlines():
            if re.search( "[0-9]\.[0-9]", line ):  # Step
                if re.search( " - PASS$", line ):
                    steps += 1
                    stepLines.append( "    ok - STEP %s" % line )
                elif re.search( " - FAIL$", line ):
                    steps += 1
                    stepLines.append( "    not ok - STEP %s" % line )
                elif re.search( " - No Result$", line ):
                    steps += 1
                    stepLines.append( "    ok - STEP %s # TODO: No assertion in test step" % line )
            else:  # Substep
                stepLines.append( "    # %s" % line )
        if steps > 0:
            self.log.TAP( "    1..%s" % steps )
        for line in stepLines:
            self.log.TAP( line )


    def organizeResult( self, caseNum, result ):
        """
            Organize the result and put the current number into either
            failed/noResult lists.
            * caseNum - number of the case
            * result - result of the case
        """
        if result == main.FALSE:
            self.failedCase.append( caseNum )
        elif result == self.NORESULT:
            self.noResultCase.append( caseNum )

    def runStep( self, code, testCaseNumber ):
        if not cli.pause:
            try:
                step = self.stepCount
                # stepResults format: ( stepNo, stepName, stepResult, onFail )
                # NOTE: This is needed to catch results of main.step()'s
                #       called inside functions or loops
                self.stepResults = ( [], [], [], [] )
                exec code[ testCaseNumber ][ step ] in module.__dict__
                self.stepCount = self.stepCount + 1
                self.parseStepResults( testCaseNumber )
            except SkipCase:  # Raised in self.skipCase()
                self.log.warn( "Skipping the rest of CASE" +
                               str( testCaseNumber ) )
                self.parseStepResults( testCaseNumber )
                self.stepResultsList.append( self.STEPRESULT )
                self.stepCache += "\t\t" + self.onFailMsg + "\n"
                self.stepCount = self.stepCount + 1
                return self.FALSE
            except StandardError as e:
                try:
                    stepNo = self.stepResults[ 0 ][ self.stepNumber - 1 ]
                except IndexError:
                    stepNo = "<IndexError>"
                    main.log.warn( "Error trying to get step number. " +
                                   "It is likely between step " +
                                   str( self.stepNumber ) + " and step " +
                                   str( self.stepNumber + 1 ) )
                try:
                    stepName = self.stepResults[ 1 ][ self.stepNumber - 1 ]
                except IndexError:
                    stepName = "<IndexError>"
                self.log.error( "\nException in the following section of" +
                                " code: " + str( testCaseNumber ) + "." +
                                str( stepNo ) + ": " + stepName )
                self.log.error( str( e.__class__ ) + str( e.message ) )
                self.log.exception( "" )
                self.stepCount = self.stepCount + 1
                self.logger.updateCaseResults( self )
                self.stepResultsWiki()
                self.stepResultsTAP()
                # summary results
                self.log.summary( self.stepCache )
                self.stepCache = ""
                self.cleanup()
                self.exit()
            return self.TRUE
        if cli.stop:
            cli.stop = False
            self.TOTAL_TC_NORESULT = self.TOTAL_TC_NORESULT + 1
            self.testCaseResult[ str( self.CurrentTestCaseNumber ) ] = "Stopped"
            self.logger.updateCaseResults( self )
            result = self.cleanup()
            return self.FALSE

    def stepResultsWiki( self ):
        """
        Add step results to the wiki file
        """
        # WIKI results
        self.log.wiki( "<ul>" )
        for line in self.stepCache.splitlines():
            if re.search( " - PASS$", line ):
                self.log.wiki( "<li>" + line + "  <ac:emoticon ac:name=\"tick\" /></li>\n" )
            elif re.search( " - FAIL$", line ):
                self.log.wiki( "<li>" + line + "  <ac:emoticon ac:name=\"cross\" /></li>\n" )
            elif re.search( " - No Result$", line ):
                self.log.wiki( "<li>" + line + "  <ac:emoticon ac:name=\"warning\" /></li>\n" )
            else:  # Should only be on fail message
                self.log.wiki( "<ul><li>" + line + "</li></ul>\n" )
        self.log.wiki( "</ul>" )

    def stepResultsTAP( self ):
        """
        Add step results to the TAP file
        """
        # TAP results
        # TODO Do we need indetation for the steps?
        main.log.debug( "StepResultsTAP" )
        for line in self.stepCache.splitlines():
            if re.search( " - PASS$", line ):
                self.log.TAP( "    ok - STEP %s" % line )
            elif re.search( " - FAIL$", line ):
                self.log.TAP( "    not ok - STEP %s" % line )
            elif re.search( " - No Result$", line ):
                self.log.TAP( "    ok - STEP %s # TODO: No assertion in test step" % line )
            else:  # Should only be on fail message
                self.log.TAP( "    # %s" % line )

    def parseStepResults( self, testCaseNumber ):
        """
        Parse throught the step results for the wiki
        """
        try:
            # Iterate through each of the steps and print them
            for index in range( len( self.stepResults[ 0 ] ) ):
                # stepResults = ( stepNo, stepName, stepResult, onFail )
                stepNo = self.stepResults[ 0 ][ index ]
                stepName = self.stepResults[ 1 ][ index ]
                stepResult = self.stepResults[ 2 ][ index ]
                onFail = self.stepResults[ 3 ][ index ]
                self.stepCache += "\t" + str( testCaseNumber ) + "."
                self.stepCache += str( stepNo ) + " "
                self.stepCache += stepName + " - "
                if stepResult == self.TRUE:
                    self.stepCache += "PASS\n"
                elif stepResult == self.FALSE:
                    self.stepCache += "FAIL\n"
                    self.stepCache += "\t\t" + onFail + "\n"
                else:
                    self.stepCache += "No Result\n"
                self.stepResultsList.append( stepResult )
        except Exception:
            self.log.exception( "Error parsing step results" )

    def skipCase( self, result="NORESULT", msg=None ):
        """
        Will skip the rest of the code in a test case. The case results will be
        determined as normal based on completed assertions unless the result
        argument is given.

        Optional Arguments:
            result: Case insensitive string. Can be 'PASS' or 'FAIL' and will set
                    the case result accordingly.
            msg: Message to be printed when the case is skipped in the reports.
        """
        result = result.upper().strip()
        if result == "PASS":
            self.CASERESULT = self.TRUE
        elif result == "NORESULT":
            self.CASERESULT = self.NORESULT
        else:
            self.CASERESULT = self.FALSE
        self.onFailMsg = "Skipping the rest of this case. "
        if msg:
            self.onFailMsg += str( msg )
        raise SkipCase

    def addCaseHeader( self ):
        caseHeader = "\n" + "*" * 30 + "\n Result summary for Testcase" + \
                     str( self.CurrentTestCaseNumber ) + "\n" + "*" * 30 + "\n"
        self.log.exact( caseHeader )
        caseHeader = "\n" + "*" * 40 + "\nStart of Test Case" + \
                     str( self.CurrentTestCaseNumber ) + " : "
        for driver in self.componentDictionary.keys():
            vars( self )[ driver + 'log' ].info( caseHeader )

    def addCaseFooter( self ):
        stepNo = self.stepResults[ 0 ][ -2 ]
        if stepNo > 0:
            previousStep = " " + str( self.CurrentTestCaseNumber ) + "." + \
                           str( stepNo ) + ": " + str( self.stepName )
            stepHeader = "\n" + "*" * 40 + "\nEnd of Step " + previousStep + \
                         "\n" + "*" * 40 + "\n"

        caseFooter = "\n" + "*" * 40 + "\nEnd of Test case " + \
                     str( self.CurrentTestCaseNumber ) + "\n" + "*" * 40 + "\n"

        for driver in self.driversList:
            vars( self )[ driver ].write( stepHeader + "\n" + caseFooter )

    def setCheckingPoint( self ):
        '''
        Using when running findPatchScript.sh. This function needs to be placed
        on the point that has the problem.

        For example, if you see unusual behavior or from the portion of the code,
        this is where you need to put with the conditional statement.
        If some of the latency result is much greater than usual, have if statement
        that checks if the result is greater than some point and include this function.

        This will mark the 0 to findPatchResult.txt in /tmp/ and exit the test.
        Then from findPatchScript, it will move onto the next commit and re-run the
        test.
        '''
        self.log.error( "Reached to the checking point. Will mark the result and exit the test" )
        resultFile = open( "/tmp/findPatchResult.txt", "w" )
        resultFile.write( "0" )
        resultFile.close()
        self.cleanAndExit()

    def cleanup( self ):
        '''
        Print a summary of the current test's results then attempt to release
        all the component handles and the close opened file handles.

        This function shouldbe threadsafe such that cleanup will only be
        executed once per test.

        This will return TRUE if all the component handles and log handles
        closed properly, else return FALSE.
        '''
        result = self.TRUE
        lock = self.cleanupLock
        if lock.acquire( False ):
            try:
                if self.cleanupFlag is False:  # First thread to run this
                    self.cleanupFlag = True
                    if self.initiated:
                        self.logger.testSummary( self )
                    components = self.componentDictionary
                    for component in sorted( components,
                                             key=lambda item: components[ item ][ 'connect_order' ],
                                             reverse=True ):
                        try:
                            tempObject = vars( self )[ component ]
                            print "Disconnecting from " + str( tempObject.name ) + \
                                  ": " + str( tempObject.__class__ )
                            tempObject.disconnect()
                        except KeyboardInterrupt:
                            pass
                        except KeyError:
                            # Component not created yet
                            self.log.warn( "Could not find the component " +
                                           str( component ) )
                        except StandardError:
                            self.log.exception( "Exception while disconnecting from " +
                                                 str( component ) )
                            result = self.FALSE
                    # Closing all the driver's session files
                    for driver in self.componentDictionary.keys():
                        try:
                            vars( self )[ driver ].close_log_handles()
                        except KeyboardInterrupt:
                            pass
                        except KeyError:
                            # Component not created yet
                            self.log.warn( "Could not find the component " +
                                           str( driver ) + " while trying to" +
                                           " close log file" )
                        except StandardError:
                            self.log.exception( "Exception while closing log files for " +
                                                 str( driver ) )
                            result = self.FALSE
                else:
                    pass  # Someone else already ran through this function
            finally:
                lock.release()
        else:  # Someone already has a lock
            # NOTE: This could cause problems if we don't release the lock
            #       correctly
            lock.acquire()  # Wait for the other thread to finish
            # NOTE: If we don't wait, exit could be called while the thread
            #       with the lock is still cleaning up
            lock.release()
        return result

    def pause( self ):
        '''
        This function will pause the test's execution, and will continue after
        user provide 'resume' command.
        '''
        __builtin__.testthread.pause()

    def onfail( self, *components ):
        '''
        When test step failed, calling all the components onfail.
        '''
        if not components:
            try:
                for component in self.componentDictionary.keys():
                    tempObject = vars( self )[ component ]
                    result = tempObject.onfail()
            except StandardError as e:
                print str( e )
                result = self.FALSE
        else:
            try:
                for component in components:
                    tempObject = vars( self )[ component ]
                    result = tempObject.onfail()
            except StandardError as e:
                print str( e )
                result = self.FALSE

    def getDriverPath( self, driverName ):
        '''
           Based on the component 'type' specified in the params , this method
           will find the absolute path, by recursively searching the name of
           the component.

           NOTE: This function requires the linux 'find' command.
        '''
        import commands

        cmd = "find " + drivers_path + " -name " + driverName + ".py"
        result = commands.getoutput( cmd )

        result_array = str( result ).split( '\n' )
        result_count = 0

        for drivers_list in result_array:
            result_count = result_count + 1
        if result_count > 1:
            print "Found " + driverName + " " + str( result_count ) + " times:"
            print str( result_array )
            self.exit()

        result = re.sub( "(.*)drivers", "", result )
        result = re.sub( "\/\/", "/", result )
        result = re.sub( "\.py", "", result )
        result = re.sub( "\.pyc", "", result )
        result = re.sub( "\/", ".", result )
        result = "drivers" + result
        return result

    def step( self, stepDesc ):
        '''
           The step information of the test-case will append to the logs.
        '''
        previousStep = " " + str( self.CurrentTestCaseNumber ) + "." + \
                       str( self.stepNumber ) + ": " + str( self.stepName )
        self.stepName = stepDesc
        self.stepNumber += 1
        self.stepResults[ 0 ].append( self.stepNumber )
        self.stepResults[ 1 ].append( stepDesc )
        self.stepResults[ 2 ].append( self.NORESULT )
        self.stepResults[ 3 ].append( "No on fail message given" )

        stepName = " " + str( self.CurrentTestCaseNumber ) + "." + \
                   str( self.stepNumber ) + ": " + str( stepDesc )
        self.log.step( stepName )
        stepHeader = ""
        line = "\n" + "-" * 45 + "\n"
        if self.stepNumber > 1:
            stepHeader = line + "End of Step " + previousStep + line
        stepHeader += line + "Start of Step" + stepName + line
        for driver in self.componentDictionary.keys():
            vars( self )[ driver + 'log' ].info( stepHeader )

    def case( self, testCaseName ):
        '''
           Test's each test-case information will append to the logs.
        '''
        self.CurrentTestCase = testCaseName
        testCaseName = " " + str( testCaseName )
        self.log.case( testCaseName )
        caseHeader = testCaseName + "\n" + "*" * 40 + "\n"
        for driver in self.componentDictionary.keys():
            vars( self )[ driver + 'log' ].info( caseHeader )

    def testDesc( self, description ):
        '''
           Test description will append to the logs.
        '''
        description = "Test Description : " + str( description )
        self.log.info( description )

    def _getTest( self ):
        '''
        This method will parse the test script to find required test
        information.
        '''
        testFileHandler = open( main.testFile, 'r' )
        testFileList = testFileHandler.readlines()
        testFileHandler.close()
        counter = 0
        for index in range( len( testFileList ) ):
            lineMatch = re.match( '\s+def CASE(\d+)(.*):',
                                  testFileList[ index ],
                                  0 )
            if lineMatch:
                counter = counter + 1
                self.TC_PLANNED = len( self.testcases_list )

    def response_parser( self, response, return_format ):
        ''' It will load the default response parser '''
        response_dict = {}
        response_dict = self.response_to_dict( response, return_format )
        return_format_string = self.dict_to_return_format( response,
                                                           return_format,
                                                           response_dict )
        return return_format_string

    def response_to_dict( self, response, return_format ):
        response_dict = {}
        json_match = re.search( '^\s*{', response )
        xml_match = re.search( '^\s*\<', response )
        ini_match = re.search( '^\s*\[', response )
        if json_match:
            self.log.info( "Response is in 'JSON' format, converting to '" +
                           return_format + "' format" )
            # Formatting the json string
            response = re.sub( r"{\s*'?(\w)", r'{"\1', response )
            response = re.sub( r",\s*'?(\w)", r',"\1', response )
            response = re.sub( r"(\w)'?\s*:", r'\1":', response )
            response = re.sub( r":\s*'(\w)'\s*([,}])", r':"\1"\2', response )
            try:
                import json
                response_dict = json.loads( response )
            except StandardError:
                self.log.exception( "Json Parser is unable to parse the string" )
            return response_dict
        elif ini_match:
            self.log.info( "Response is in 'INI' format, converting to '" +
                           return_format + "' format" )
            from configobj import ConfigObj
            response_file = open( "respnse_file.temp", 'w' )
            response_file.write( response )
            response_file.close()
            response_dict = ConfigObj( "respnse_file.temp" )
            return response_dict
        elif xml_match:
            self.log.info( "Response is in 'XML' format, converting to '" +
                           return_format + "' format" )
            try:
                response_dict = xmldict.xml_to_dict( "<response> " +
                                                     str( response ) +
                                                     " </response>" )
            except StandardError:
                self.log.exception()
            return response_dict

    def dict_to_return_format( self, response, return_format, response_dict ):
        if return_format == 'table':
            ''' Will return in table format'''
            to_do = "Call the table output formatter"
            global response_table
            response_table = '\n'
            response_table = response_table + '\t'.join( response_dict ) + "\n"

            def get_table( value_to_convert ):
                ''' This will parse the dictionary recusrsively and print as
                    table format'''
                table_data = ""
                if isinstance( value_to_convert, dict ):
                    table_data = table_data + '\t'.join( value_to_convert ) + \
                                 "\n"
                    for temp_val in value_to_convert.values():
                        table_data = table_data + get_table( temp_val )
                else:
                    table_data = table_data + str( value_to_convert ) + "\t"
                return table_data

            for value in response_dict.values():
                response_table = response_table + get_table( value )
            return response_table

        elif return_format == 'config':
            ''' Will return in config format'''
            to_do = 'Call dict to config coverter'
            response_string = str( response_dict )
            print response_string
            response_config = re.sub( ",", "\n\t", response_string )
            response_config = re.sub( "u\'", "\'", response_config )
            response_config = re.sub( "{", "", response_config )
            response_config = re.sub( "}", "\n", response_config )
            response_config = re.sub( ":", " =", response_config )
            return "[response]\n\t " + response_config
        elif return_format == 'xml':
            ''' Will return in xml format'''
            response_xml = xmldict.dict_to_xml( response_dict )
            response_xml = re.sub( ">\s*<", ">\n<", response_xml )
            return "\n" + response_xml
        elif return_format == 'json':
            ''' Will return in json format'''
            to_do = 'Call dict to xml coverter'
            import json
            response_json = json.dumps( response_dict )
            return response_json

    def get_random( self ):
        self.random_order = self.random_order + 1
        return self.random_order

    def exit( self ):
        __builtin__.testthread = None
        for thread in threading.enumerate():
            if thread.isAlive():
                try:
                    thread._Thread__stop()
                except:
                    # NOTE: We should catch any exceptions while trying to
                    # close the thread so that we can try to close the other
                    # threads as well
                    print str( thread.getName() ) + \
                          ' could not be terminated'
        os.system( "stty sane" )  # fix format if necessary
        sys.exit()

    def cleanAndExit( self, alarm=True, msg="" ):
        """
            It will set the testcase result to be FAILED and update it
            before cleaning up and exitting the test.
            alarm: when set to True, it will write to the alarm log before
            cleaning up and exitting; otherwise it will write to error log.
            msg: message that will be written to the log if specified;
            otherwise a default message will be written.
        :return:
        """
        if self.CurrentTestCaseNumber:
            self.testCaseResult[ str( self.CurrentTestCaseNumber ) ] = self.FALSE
            self.organizeResult( self.CurrentTestCaseNumber, self.FALSE )
            self.logger.updateCaseResults( self )
        if alarm:
            if msg:
                self.log.alarm( "Test exited unexpectedly: {}".format( msg ) )
            else:
                self.log.alarm( "Test exited unexpectedly" )
        else:
            if msg:
                self.log.error( "Test exited unexpectedly: {}".format( msg ) )
            else:
                self.log.error( "Test exited unexpectedly" )
        self.cleanup()
        self.exit()

    def stop( self, email=False ):
        """
        Stop the test until Ctrl-D is entered.
        Ctrl-C will kill the test

        Optional arguments:
        email can either be a bool, or you can specify the email address
        to send the email to
        """
        try:
            if email:
                if '@' in email:
                    main.mail = email
                utilities.send_warning_email()
            self.log.debug( "Test execution suspended. \n"
                            "- Type 'c' to resume the test.\n"
                            "- Type Ctrl-C to exit the test.\n"
                            "- Enter interactive python interpreter commands.\n"
                            "\t- ie: main.Mininet1.pingall()\n"
                            "- Type 'help' for help with pdb." )
            pdb.set_trace()
        except EOFError:
            return
        # Pass all other exceptions up to caller


def verifyOptions( options ):
    '''
    This will verify the command line options and set to default values,
    if any option not given in command line.
    '''
    verifyTest( options )
    verifyExample( options )
    verifyTestScript( options )
    verifyParams( options )
    verifyLogdir( options )
    verifyMail( options )
    verifyTestCases( options )
    verifyOnosCell( options )

def verifyTest( options ):
    try:
        if options.testname:
            main.TEST = options.testname
            main.classPath = "tests." + main.TEST + "." + main.TEST
            main.tests_path = tests_path
        elif options.example:
            main.TEST = options.example
            main.tests_path = path + "/examples/"
            main.classPath = "examples." + main.TEST + "." + main.TEST
    except AttributeError:
        print "Test or Example not specified please specify the --test <test name > or --example <example name>"
        main.exit()

def verifyExample( options ):
    if options.example:
        main.testDir = path + '/examples/'
        main.tests_path = path + "/examples/"
        main.classPath = "examples." + main.TEST + "." + main.TEST

def verifyLogdir( options ):
    # Verifying Log directory option
    if options.logdir:
        main.logdir = options.logdir
    else:
        main.logdir = main.FALSE

def verifyMail( options ):
    # Mail-To: field
    if options.mail:  # Test run specific
        main.mail = options.mail
    elif main.params.get( 'mail' ):  # Test suite specific
        main.mail = main.params.get( 'mail' )
    else:  # TestON specific
        main.mail = main.config[ 'config' ].get( 'mail_to' )
    # Mail-From: field
    main.sender = main.config[ 'config' ].get( 'mail_from' )
    # Mail smtp server
    main.smtp = main.config[ 'config' ].get( 'mail_server' )
    # Mail-From account password
    main.senderPwd = main.config[ 'config' ].get( 'mail_pass' )

def evalTestCase( tempList ):
    tList = []
    for tcase in tempList:
        if isinstance( tcase, list ):
            tList.extend( evalTestCase( tcase ) )
        else:
            tList.extend( [ tcase ] )
    return tList

def verifyTestCases( options ):
    # Getting Test cases list
    if options.testcases:
        testcases_list = options.testcases
        # sys.exit()
        testcases_list = re.sub( "(\[|\])", "", options.testcases )
        main.testcases_list = eval( testcases_list + "," )
    else:
        if 'testcases' in main.params.keys():
            temp = eval( main.params[ 'testcases' ] + "," )
            main.testcases_list = evalTestCase( list( temp ) )
        else:
            print "Testcases not specifed in params, please provide in " + \
                  "params file or 'testcases' commandline argument"
            sys.exit()

def verifyOnosCell( options ):
    # Verifying onoscell option
    if options.onoscell:
        main.onoscell = options.onoscell
        main.ONOSip = []
        main.mnIP = ""
        cellCMD = ". ~/onos/tools/dev/bash_profile; cell " + main.onoscell
        output = subprocess.check_output( [ "bash", '-c', cellCMD ] )
        splitOutput = output.splitlines()
        main.apps = ""
        for i in range( len( splitOutput ) ):
            if re.match( "OCN", splitOutput[ i ] ):
                mnNode = splitOutput[ i ].split( "=" )
                main.mnIP = mnNode[ 1 ]
            # cell already sorts OC variables in bash, so no need to
            # sort in TestON
            elif re.match( "OC[1-9]", splitOutput[ i ] ):
                onosNodes = splitOutput[ i ].split( "=" )
                main.ONOSip.append( onosNodes[ 1 ] )
            elif re.match( "ONOS_APPS", splitOutput[ i ] ):
                main.apps = ( splitOutput[ i ].split( "=" ) )[ 1 ]
    else:
        main.onoscell = main.FALSE

def verifyTestScript( options ):
    '''
    Verifyies test script.
    '''
    main.openspeak = openspeak.OpenSpeak()
    directory = main.testDir + "/" + main.TEST
    if os.path.exists( directory ):
        pass
    else:
        directory = ""
        for root, dirs, files in os.walk( main.testDir, topdown=True ):
            if not directory:
                for name in dirs:
                    if name == main.TEST:
                        directory = ( os.path.join( root, name ) )
                        index = directory.find( "/tests/" ) + 1
                        main.classPath = directory[ index: ].replace( '/', '.' ) + "." + main.TEST
                        break
    openspeakfile = directory + "/" + main.TEST + ".ospk"
    main.testDir = directory
    main.testFile = directory + "/" + main.TEST + ".py"
    if os.path.exists( openspeakfile ):
        # Openspeak file found, compiling to python
        main.openspeak.compiler( openspeakfile=openspeakfile, writetofile=1 )
    elif os.path.exists( main.testFile ):
        # No openspeak found, using python file instead
        pass
    else:
        print "\nThere is no \"" + main.TEST + "\" test script.\nPlease provide a " + \
              "Python or OpenSpeak test script in the tests folder: " + \
              main.testDir + "/" + main.TEST + "/"
        __builtin__.testthread = None
        main.exit()
    try:
        testModule = __import__( main.classPath,
                                 globals(),
                                 locals(),
                                 [ main.TEST ],
                                 -1 )
    except ImportError:
        print "There was an import error, it might mean that there is " + \
              "no test named " + main.TEST
        main.exit()

    testClass = getattr( testModule, main.TEST )
    main.testObject = testClass()
    load_parser()
    main.paramsFile = main.TEST + ".params" if options.paramsFile is None else options.paramsFile
    main.topoFile = main.TEST + ".topo" if options.topoFile is None else options.topoFile
    main.params = main.parser.parseFile( main.testDir + "/" + main.paramsFile )
    main.topology = main.parser.parseFile( main.testDir + "/" + main.topoFile )

def verifyParams( options ):
    try:
        main.params = main.params[ 'PARAMS' ]
    except KeyError:
        print "Error with the params file: Either the file not specified " + \
              "or the format is not correct"
        main.exit()
    try:
        main.topology = main.topology[ 'TOPOLOGY' ]
    except KeyError:
        print "Error with the Topology file: Either the file not specified " + \
              "or the format is not correct"
        main.exit()
    # Overwrite existing params variables if they are specified from command line
    if len( options.params ) > 0:
        # Some params variables are specified from command line
        for param in options.params:
            if not re.search( ".=.", param ):
                print( "Error when parsing params: params should follow key=value format" )
                continue
            # Split the param string to catch nested keys and the value
            [ keys, value ] = param.split( "=" )
            # Split the nested keys according to its hierarchy
            keyList = keys.split( "/" )
            # Get the outermost dictionary
            paramDict = main.params
            # Get the innermost dictionary
            try:
                while len( keyList ) > 1:
                    key = keyList.pop( 0 )
                    assert isinstance( paramDict[ key ], dict )
                    paramDict = paramDict[ key ]
            except KeyError:
                print( "Error when parsing params: key \"" + key + "\" not found in main.params" )
                main.exit()
            except AssertionError:
                print( "Error when parsing params: \"" + key + "\" is already the innermost level in main.params" )
                main.exit()
            # Change the value
            if keyList[ 0 ] not in paramDict:
                print( "Error when parsing params: key \"" + keyList[ 0 ] + "\" not found in main.params" )
                main.exit()
            elif isinstance( paramDict[ keyList[ 0 ] ], dict ):
                print( "Error when parsing params: more levels under key \"" + keyList[ 0 ] + "\" in main.params" )
                main.exit()
            else:
                paramDict[ keyList[ 0 ] ] = value

def load_parser():
    '''
    It facilitates the loading customised parser for topology and params file.
    It loads parser mentioned in tab named parser of teston.cfg file.
    It also loads default xmlparser if no parser have specified in teston.cfg
    file.

    '''
    confighash = main.configDict
    if 'file' in confighash[ 'config' ][ 'parser' ] and\
       'class' in confighash[ 'config' ][ 'parser' ]:
        path = confighash[ 'config' ][ 'parser' ][ 'file' ]
        if path is not None or\
           confighash[ 'config' ][ 'parser' ][ 'class' ] is not None:
            try:
                module = re.sub( r".py\s*$", "", path )
                moduleList = module.split( "/" )
                newModule = ".".join( moduleList[ -2: ] )
                parsingClass = confighash[ 'config' ][ 'parser' ][ 'class' ]
                parsingModule = __import__( newModule,
                                            globals(),
                                            locals(),
                                            [ parsingClass ],
                                            -1 )
                parsingClass = getattr( parsingModule, parsingClass )
                main.parser = parsingClass()
                if hasattr( main.parser, "parseFile" ) and\
                   hasattr( main.parser, "parse" ):
                    pass
                else:
                    print "Invalid parser format"
                    main.exit()
            except ImportError:
                print "Could not find the file " + path + \
                      " using default parser."
                load_defaultParser()
        elif confighash[ 'config' ][ 'parser' ][ 'file' ] is None or\
             confighash[ 'config' ][ 'parser' ][ 'class' ] is None:
            load_defaultParser()
    else:
        load_defaultParser()

def load_defaultParser():
    '''
    It will load the default parser which is xml parser to parse the params and
    topology file.
    '''
    moduleList = main.parserPath.split( "/" )
    newModule = ".".join( moduleList[ -2: ] )
    try:
        parsingClass = main.parsingClass
        parsingModule = __import__( newModule,
                                    globals(),
                                    locals(),
                                    [ parsingClass ],
                                    -1 )
        parsingClass = getattr( parsingModule, parsingClass )
        main.parser = parsingClass()
        if hasattr( main.parser, "parseFile" ) and\
           hasattr( main.parser, "parse" ):
            pass
        else:
            main.exit()
    except ImportError:
        print sys.exc_info()[ 1 ]

def load_logger():
    '''
    It facilitates the loading customised parser for topology and params file.
    It loads parser mentioned in tab named parser of teston.cfg file.
    It also loads default xmlparser if no parser have specified in teston.cfg
    file.
    '''
    confighash = main.configDict
    if 'file' in confighash[ 'config' ][ 'logger' ] and\
       'class' in confighash[ 'config' ][ 'logger' ]:
        path = confighash[ 'config' ][ 'logger' ][ 'file' ]
        if path is not None or\
           confighash[ 'config' ][ 'logger' ][ 'class' ] is not None:
            try:
                module = re.sub( r".py\s*$", "", path )
                moduleList = module.split( "/" )
                newModule = ".".join( moduleList[ -2: ] )
                loggerClass = confighash[ 'config' ][ 'logger' ][ 'class' ]
                loggerModule = __import__( newModule,
                                           globals(),
                                           locals(),
                                           [ loggerClass ],
                                           -1 )
                loggerClass = getattr( loggerModule, loggerClass )
                main.logger = loggerClass()
            except ImportError:
                print "Could not find the file " + path + \
                      " using default logger."
                load_defaultlogger()
        elif confighash[ 'config' ][ 'parser' ][ 'file' ] is None or\
             confighash[ 'config' ][ 'parser' ][ 'class' ] is None:
            load_defaultlogger()
    else:
        load_defaultlogger()

def load_defaultlogger():
    '''
    It will load the default parser which is xml parser to parse the params and
    topology file.
    '''
    moduleList = main.loggerPath.split( "/" )
    newModule = ".".join( moduleList[ -2: ] )
    try:
        loggerClass = main.loggerClass
        loggerModule = __import__( newModule,
                                   globals(),
                                   locals(),
                                   [ loggerClass ],
                                   -1 )
        loggerClass = getattr( loggerModule, loggerClass )
        main.logger = loggerClass()

    except ImportError:
        print sys.exc_info()[ 1 ]
        main.exit()

def _echo( self ):
    print "THIS IS ECHO"