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62 lines
2.0 KiB
62 lines
2.0 KiB
#
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# (c) 2017 Aleph Objects, Inc.
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#
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# The code in this page is free software: you can
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# redistribute it and/or modify it under the terms of the GNU
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# General Public License (GNU GPL) as published by the Free Software
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# Foundation, either version 3 of the License, or (at your option)
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# any later version. The code is distributed WITHOUT ANY WARRANTY;
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# without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
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#
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import random
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import string
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class NoisySerialConnection:
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"""Wrapper class which injects character noise into data of
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a serial connection for testing Marlin's error correction"""
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def __init__(self, serial):
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self.serial = serial
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self.readErrorRate = 0
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self.writeErrorRate = 0
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def _corruptData(self, data):
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"""Introduces a single character error on a string"""
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badChar = random.choice(string.ascii_letters)
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badChar = badChar if isinstance(data, str) else badChar.encode()
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if len(data) == 0:
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return data
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if len(data) == 1:
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return badChar
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charToCorrupt = random.randint(0, len(data) - 1)
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return data[:charToCorrupt] + badChar + data[charToCorrupt+1:]
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def write(self, data):
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if(random.random() < self.writeErrorRate):
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data = self._corruptData(data)
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self.serial.write(data)
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def readline(self):
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data = self.serial.readline()
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if(random.random() < self.readErrorRate):
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data = self._corruptData(data)
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return data
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@property
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def in_waiting(self):
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return self.serial.in_waiting
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def flush(self):
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self.serial.flush()
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def close(self):
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self.serial.close()
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def setWriteErrorRate(self, badWrites, totalWrites):
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"""Inserts a single character error into every badWrites out of totalWrites"""
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self.writeErrorRate = float(badWrites)/float(totalWrites)
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def setReadErrorRate(self, badReads, totalReads):
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"""Inserts a single character error into every badReads out of totalReads"""
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self.readErrorRate = float(badReads)/float(totalReads) |