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import os
import pty
import termios
import threading
import re
class MockJDS6600Device():
class ChannelState:
def __init__(self):
self.on = False
self.frequency = None
self.amplitude = None
self.function = None
def __init__(self):
self._master, self._slave = pty.openpty()
self._masterFile = os.fdopen(self._master, mode="r+b", closefd=False, buffering=0)
self._portName = os.ttyname(self._slave)
self._channels = [MockJDS6600Device.ChannelState() for i in [1, 2]]
self._injectedFailureCounter = 0
self._mainThread = threading.Thread(target=self._mainLoop)
self._mainThread.start()
def _mainLoop(self) -> None:
while True:
try:
request = self._masterFile.readline().decode().strip()
response = self._handleRequest(request)
if response is not None:
self._masterFile.write(response.encode())
except OSError as e:
break
def _handleRequest(self, request: str) -> str:
pattern = r":(?P<opcode>[wrab])(?P<function>\d+)=(?P<args>.*)\."
m = re.search(pattern, request)
if not m:
return None
opcode = m.group("opcode")
function = int(m.group("function"))
args = m.group("args").split(",")
# channel on/off
if function == 20:
if opcode == "w":
self._channels[0].on = args[0] == "1"
self._channels[1].on = args[1] == "1"
return ":ok\r\n"
elif opcode == "r":
return f":r20={int(self._channels[0].on)},{int(self._channels[1].on)}.\r\n"
# channel frequency
elif function == 23 or function == 24:
ch = function - 23
if opcode == "w":
# Actual device takes a second argument for scaling, here we ignore it and always use 0 (Hz)
frequency = float(args[0]) / 100.0
if self._injectedFailureCounter > 0:
self._channels[ch].frequency = 0.0
self._injectedFailureCounter -= 1
else:
self._channels[ch].frequency = frequency
return ":ok\r\n"
elif opcode == "r":
frequency = self._channels[ch].frequency
return f":r{function}={int(frequency)},0.\r\n"
# channel amplitude
elif function == 25 or function == 26:
if opcode == "w":
ch = function - 25
amplitude = float(args[0]) / 1000.0
self._channels[ch].amplitude = amplitude
return ":ok\r\n"
# channel function shape
elif function == 21 or function == 22:
if opcode == "w":
ch = function - 21
shape = int(args[0])
self._channels[ch].function = shape
return ":ok\r\n"
# Unknown request format, no response
return None
def stop(self) -> None:
self._masterFile.close()
os.close(self._master)
os.close(self._slave)
self._mainThread.join()
def checkPortConfiguration(self) -> None:
iflag, oflag, cflag, lflag, ispeed, ospeed, cc = termios.tcgetattr(self._slave)
# JDS6600 configuration taken from manual
assert ispeed == termios.B115200
assert ospeed == termios.B115200
assert (cflag & termios.CSIZE) == termios.CS8
assert (cflag & termios.CSTOPB) == 0
assert (cflag & (termios.PARENB | termios.PARODD)) == 0
def getPortName(self) -> str:
return self._portName
def isOn(self, ch: int) -> bool:
return self._channels[ch - 1].on
def getFrequency(self, ch: int) -> float:
return self._channels[ch - 1].frequency
def getAmplitude(self, ch: int) -> float:
return self._channels[ch - 1].amplitude
def getFunction(self, ch: int) -> int:
return self._channels[ch - 1].function
def injectFailures(self, count: int) -> None:
self._injectedFailureCounter += count
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