import unittest
import sh
import ex

class Qethernet(unittest.TestCase):
    __sip = None
    __numbytestx = None
    __bind = None
    __OKBW = None

    def __init__(self, testname, testfunc, varlist):
        super(Qethernet, self).__init__(testfunc)
        if "sip" in varlist:
            self.__sip = varlist["sip"]
        else:
            raise Exception('sip param inside Qethernet have been be defined')
        if "bind" in varlist:
            self.__bind = varlist["bind"]
        else:
            self.__bind = None
        if "OKBW" in varlist:
            self.__OKBW = varlist["OKBW"]
        else:
            raise Exception('OKBW param inside Qethernet must be defined')
        self.__numbytestx = "10M"
        self._testMethodDoc = testname

    def execute(self):
        # execute iperf command against the server
        if self.__bind is None:
            p = sh.iperf("-c", self.__sip, "-x", "CMSV", "-n", self.__numbytestx, "-f", "m")
        else:
            p = sh.iperf("-c", self.__sip, "-x", "CMSV", "-n", self.__numbytestx, "-f", "m", "-B", self.__bind)
        #check if it was executed succesfully
        if p.exit_code == 0:
            if p.stdout == "":
                self.fail("failed: error executing iperf command")
            # analyze output string
            # split by lines    
            lines = p.stdout.splitlines()
            # get first line
            dat = lines[1].decode('ascii')
            # search for the BW value
            a = re.search("\d+(\.\d)? Mbits/sec",dat)
            b = a.group().split( )
            BWreal = b[0]

            # check if BW is in the expected range
            self.failUnless(float(BWreal)>float(self.__OKBW)*0.9,"failed: speed is lower than spected. Speed(MB/s)" + str(BWreal))
        else:
            self.fail("failed: could not complete iperf command")