import unittest
import sh
import re
import json


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

    # varlist content: serverip, bwexpected, port
    def __init__(self, testname, testfunc, varlist):
        # save the parameters list
        self.params = varlist
        # configure the function to be executed when the test runs. "testfunc" is a name of a method inside this
        # class, that in this situation, it can only be "execute".
        super(Qethernet, self).__init__(testfunc)
        # validate and get the parameters
        if "serverip" in varlist:
            self.__serverip = varlist["serverip"]
        else:
            raise Exception('sip param inside Qethernet have been be defined')
        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
        try:
            p = sh.iperf3("-c", self.__serverip, "-n", self.__numbytestx, "-f", "m", "-p", self.__port, "-J",
                          _timeout=20)
        except sh.TimeoutException:
            self.fail("failed: iperf timeout reached")

        # check if it was executed succesfully
        if p.exit_code == 0:
            if p.stdout == "":
                self.fail("failed: error executing iperf command")
            # analyze output string
            data = json.loads(p.stdout.decode('ascii'))
            self.__bwreal = float(data['end']['sum_received']['bits_per_second'])/1024/1024
            # save result file
            with open('/tmp/ethernet-iperf.json', 'w') as outfile:
                json.dump(data, outfile, indent=4)

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

    def getresults(self):
        # resultlist is a python list of python dictionaries
        resultlist = [
            {
                "desc": "iperf3 output",
                "data": "/tmp/ethernet-iperf.json",
                "type": "file"
            }
        ]
        return resultlist