import unittest
import sh
import re


class Qethernet(unittest.TestCase):
    __serverip = None
    __numbytestx = None
    __bind = None
    __bwexpected = None
    __port = None
    params = None

    #varlist content: serverip, bwexpected, port, (optional)bind
    def __init__(self, testname, testfunc, varlist):
        self.params = varlist
        super(Qethernet, self).__init__(testfunc)
        if "serverip" in varlist:
            self.__serverip = varlist["serverip"]
        else:
            raise Exception('sip param inside Qethernet have been be defined')
        if "bind" in varlist:
            self.__bind = varlist["bind"]
        else:
            self.__bind = None
        if "bwexpected" in varlist:
            self.__bwexpected = varlist["bwexpected"]
        else:
            raise Exception('bwexpected param inside Qethernet must be defined')
        if "port" in varlist:
            self.__port = varlist["port"]
        else:
            raise Exception('port 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.__serverip, "-x", "CMSV", "-n", self.__numbytestx, "-f", "m", "-p", self.__port)
        else:
            p = sh.iperf("-c", self.__serverip, "-x", "CMSV", "-n", self.__numbytestx, "-f", "m", "-p", self.__port, "-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.__bwexpected) * 0.9,
                            "failed: speed is lower than spected. Speed(MB/s)" + str(bwreal))
        else:
            self.fail("failed: could not complete iperf command")