mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-17 20:08:12 +00:00
47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
# This file is part of the TREZOR project.
|
|
#
|
|
# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
|
|
# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
|
|
# Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.com>
|
|
#
|
|
# This library is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Lesser General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This library 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 Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public License
|
|
# along with this library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
from __future__ import absolute_import
|
|
|
|
|
|
class TransportException(Exception):
|
|
pass
|
|
|
|
|
|
class Transport(object):
|
|
|
|
def __init__(self):
|
|
self.session_counter = 0
|
|
|
|
def session_begin(self):
|
|
if self.session_counter == 0:
|
|
self.open()
|
|
self.session_counter += 1
|
|
|
|
def session_end(self):
|
|
self.session_counter = max(self.session_counter - 1, 0)
|
|
if self.session_counter == 0:
|
|
self.close()
|
|
|
|
def open(self):
|
|
raise NotImplementedError
|
|
|
|
def close(self):
|
|
raise NotImplementedError
|