In windows 10 I want to write an async-free version of telnetlib3 with python 3.10.11. I created the code I will attach to the end of my question, which seem to work fine in creating a new telnet connection and read data. However, when I use the write method of the Telnet3 class I get the following error:
Traceback (most recent call last):
session.write("test")
File "C:\Users\Test\example_telnet3_sync.py", line 66, in write
response = loop.run_until_complete(_write(self.writer, command))
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.3056.0_x64__qbz5n2kfra8p0\lib\asyncio\base_events.py", line 649, in run_until_complete
return future.result()
File "C:\Users\Test\example_telnet3_sync.py", line 41, in _write
writer.write(command + "\r\n")
File "C:\Users\Test\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\telnetlib3\stream_writer.py", line 2614, in write
self._write(self.encode(string, errors))
File "C:\Users\Test\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\telnetlib3\stream_writer.py", line 1735, in _write
self._transport.write(buf)
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.3056.0_x64__qbz5n2kfra8p0\lib\asyncio\proactor_events.py", line 365, in write
self._loop_writing(data=bytes(data))
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.10_3.10.3056.0_x64__qbz5n2kfra8p0\lib\asyncio\proactor_events.py", line 401, in _loop_writing
self._write_fut = self._loop._proactor.send(self._sock, data)
AttributeError: 'NoneType' object has no attribute 'send'
I am not familiar with telnetlib3 or asyncio. Is there a way to fix this error?
Here is the complete code:
import asyncio
import telnetlib3
async def _open(host, port):
reader, writer = await telnetlib3.open_connection(host, port)
data = await asyncio.wait_for(reader.read(4096), timeout=2)
return reader, writer, data
async def _read(reader, expected="myprompt >>"):
reply = ""
while True:
data = await reader.read(4096)
if data:
reply += data
if expected in reply:
break
return reply
async def _read_timeout(reader, timeout=2):
try:
return await asyncio.wait_for(_read(reader), timeout=timeout)
except (asyncio.exceptions.TimeoutError, RuntimeError):
print("TimeoutError while reading from telnet!")
return None
async def _write(writer, command):
writer.write(command + "\r\n")
class Telnet3:
def __init__(self, host, port):
self.host = host
self.port = port
self.reader = None
self.writer = None
self.message = ""
def connect(self):
loop = asyncio.new_event_loop()
self.reader, self.writer, self.message = loop.run_until_complete(_open(self.host, self.port))
loop.close()
def read(self):
loop = asyncio.new_event_loop()
response = loop.run_until_complete(_read_timeout(self.reader))
loop.close()
return response
def write(self, command):
loop = asyncio.new_event_loop()
loop.run_until_complete(_write(self.writer, command))
loop.close()
def write_read(self, command):
self.write(command)
return self.read()
if __name__ == "__main__":
session = Telnet3("100.200.10.10", 9000)
session.connect()
session.write("test")
