Markus Zolliker
e623fe8287
in corner cases, encode_msg and decode_msg_frame fail Change-Id: I28b3ddcdce80c7c5b71afe19b11bb73cd761f595 Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/22211 Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de> Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de> Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
# -*- coding: utf-8 -*-
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# *****************************************************************************
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#
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Module authors:
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# Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
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# Markus Zolliker <markus.zolliker@psi.ch>
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#
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# *****************************************************************************
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import json
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EOL = b'\n'
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def encode_msg_frame(action, specifier=None, data=None):
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""" encode a msg_triple into an msg_frame, ready to be sent
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action (and optional specifier) are str strings,
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data may be an json-yfied python object"""
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msg = (action, specifier or '', '' if data is None else json.dumps(data))
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return ' '.join(msg).strip().encode('utf-8') + EOL
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def get_msg(_bytes):
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"""try to deframe the next msg in (binary) input
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always return a tuple (msg, remaining_input)
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msg may also be None
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"""
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if EOL not in _bytes:
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return None, _bytes
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return _bytes.split(EOL, 1)
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def decode_msg(msg):
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"""decode the (binary) msg into a (str) msg_triple"""
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res = msg.strip().decode('utf-8').split(' ', 2) + ['', '']
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action, specifier, data = res[0:3]
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return action, specifier or None, None if data == '' else json.loads(data)
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