#! /usr/bin/env python3

"""
#   ThreadSafeConnect.py : stress thread safeness of
#   SCardConnect/SCardDisconnect
#   Copyright (C) 2010  Ludovic Rousseau
"""

#   This program 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 3 of the License, or
#   (at your option) any later version.
#
#   This program 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 this program; if not, see <http://www.gnu.org/licenses/>.


from smartcard.scard import (SCardEstablishContext, SCardReleaseContext,
    SCardListReaders, SCardConnect, SCardDisconnect,
    SCARD_SHARE_SHARED, SCARD_PROTOCOL_ANY, SCARD_LEAVE_CARD,
    SCARD_SCOPE_USER, SCARD_S_SUCCESS)
from smartcard.pcsc.PCSCExceptions import *
import threading

MAX_THREADS = 10
MAX_ITER = 10


def stress(*args):
    """
    stress method
    """
    thread = args[0]
    print("Starting thread:", thread)

    hresult, hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
    if hresult != SCARD_S_SUCCESS:
        raise EstablishContextException(hresult)

    hresult, readers = SCardListReaders(hcontext, [])
    if hresult != SCARD_S_SUCCESS:
        raise ListReadersException(hresult)

    for j in range(0, MAX_ITER):
        # Connect in SCARD_SHARE_SHARED mode
        hresult, hcard, dwActiveProtocol = SCardConnect(hcontext, readers[0],
               SCARD_SHARE_SHARED, SCARD_PROTOCOL_ANY)
        if hresult != SCARD_S_SUCCESS:
            raise BaseSCardException(hresult)

        log = "%d:%d" % (thread, j)
        print(log, end=' ')

        hresult = SCardDisconnect(hcard, SCARD_LEAVE_CARD)
        if hresult != SCARD_S_SUCCESS:
            raise BaseSCardException(hresult)

    print()

    hresult = SCardReleaseContext(hcontext)
    if hresult != SCARD_S_SUCCESS:
        raise ReleaseContextException(hresult)

    print("Exiting thread:", thread)


def main():
    """
    main
    """

    threads = list()

    for i in range(0, MAX_THREADS):
        thread = threading.Thread(target=stress, args=[i])
        threads.append(thread)
        thread.start()

    for thread in threads:
        print("joining:", thread.name, end=' ')
        thread.join()
        print("joined:", thread.name)

    print("Exiting main")

if __name__ == "__main__":
    main()
