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import os
import pty
import termios
import threading
class VirtualSerialPort:
def __init__(self, requestHandler):
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._requestHandler = requestHandler
self._mainThread = threading.Thread(target=self._mainLoop)
self._mainThread.start()
def stop(self) -> None:
self._masterFile.close()
os.close(self._master)
os.close(self._slave)
self._mainThread.join()
def _mainLoop(self) -> None:
while True:
try:
request = self._masterFile.readline().decode().strip()
response = self._requestHandler(request)
if response is not None:
self._masterFile.write(response.encode())
except OSError as e:
break
def getPortName(self) -> str:
return self._portName
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