47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
# This file is part of the TREZOR project.
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#
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# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
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# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
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# Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.com>
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import absolute_import
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class TransportException(Exception):
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pass
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class Transport(object):
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def __init__(self):
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self.session_counter = 0
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def session_begin(self):
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if self.session_counter == 0:
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self.open()
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self.session_counter += 1
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def session_end(self):
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self.session_counter = max(self.session_counter - 1, 0)
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if self.session_counter == 0:
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self.close()
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def open(self):
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raise NotImplementedError
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def close(self):
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raise NotImplementedError
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