Python SDK Bad file descriptor with asyncio

SDK Questions
1

Hi,

we've changed one of our software deployments to be Zitified instead of using Ziti Edge Tunnelers as before. Pretty cool as we can deploy via Ziti in Github Actions now! :smiling_face_with_sunglasses:
Unfortunately we are getting the below errors which we didn't get while using ZET. Any ideas?

We're using openziti==1.5.0, Controller v1.6.12

2026-01-05 19:10:40,967 - ERROR - Exception in callback _SelectorTransport._add_reader(21, <bound method..., bufsize=0>>>)
handle: <Handle _SelectorTransport._add_reader(21, <bound method..., bufsize=0>>>)>
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/asyncio/selector_events.py", line 282, in _add_reader
    key = self._selector.get_key(fd)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/selectors.py", line 192, in get_key
    raise KeyError("{!r} is not registered".format(fileobj)) from None
KeyError: '21 is not registered'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.12/asyncio/events.py", line 88, in _run
    self._context.run(self._callback, *self._args)
  File "/usr/local/lib/python3.12/asyncio/selector_events.py", line 928, in _add_reader
    self._loop._add_reader(fd, callback, *args)
  File "/usr/local/lib/python3.12/asyncio/selector_events.py", line 284, in _add_reader
    self._selector.register(fd, selectors.EVENT_READ,
  File "/usr/local/lib/python3.12/selectors.py", line 359, in register
    self._selector.register(key.fd, poller_events)
OSError: [Errno 9] Bad file descriptor
2026-01-05 19:10:40,968 - ERROR - Exception in callback _SelectorTransport._add_reader(23, <bound method..., bufsize=0>>>)
handle: <Handle _SelectorTransport._add_reader(23, <bound method..., bufsize=0>>>)>
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/asyncio/selector_events.py", line 282, in _add_reader
    key = self._selector.get_key(fd)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/asyncio/events.py", line 88, in _run
    self._context.run(self._callback, *self._args)
  File "/usr/local/lib/python3.12/asyncio/selector_events.py", line 928, in _add_reader
    self._loop._add_reader(fd, callback, *args)
  File "/usr/local/lib/python3.12/asyncio/selector_events.py", line 284, in _add_reader
    self._selector.register(fd, selectors.EVENT_READ,
  File "/usr/local/lib/python3.12/selectors.py", line 359, in register
    self._selector.register(key.fd, poller_events)
OSError: [Errno 9] Bad file descriptor
2026-01-05 19:10:40,972 - ERROR - Exception in callback _SelectorTransport._add_reader(29, <bound method..., bufsize=0>>>)
handle: <Handle _SelectorTransport._add_reader(29, <bound method..., bufsize=0>>>)>
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/asyncio/selector_events.py", line 282, in _add_reader
    key = self._selector.get_key(fd)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/selectors.py", line 192, in get_key
    raise KeyError("{!r} is not registered".format(fileobj)) from None
KeyError: '29 is not registered'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.12/asyncio/events.py", line 88, in _run
    self._context.run(self._callback, *self._args)
  File "/usr/local/lib/python3.12/asyncio/selector_events.py", line 928, in _add_reader
    self._loop._add_reader(fd, callback, *args)
  File "/usr/local/lib/python3.12/asyncio/selector_events.py", line 284, in _add_reader
    self._selector.register(fd, selectors.EVENT_READ,
  File "/usr/local/lib/python3.12/selectors.py", line 359, in register
    self._selector.register(key.fd, poller_events)
OSError: [Errno 9] Bad file descriptor

The code we're using to monkeypatch:

import os
import tempfile

import openziti


class OpenZitiConnection:
    def __init__(self):
        self._identity_tmpfile = None

    def load_ziti_identity_from_string(self, identity_json_str: str):
        self._identity_tmpfile = tempfile.NamedTemporaryFile(mode="w+", delete=False)
        self._identity_tmpfile.write(identity_json_str)
        self._identity_tmpfile.flush()

        ztx = openziti.load(self._identity_tmpfile.name)
        return ztx

    def init_ziti_from_config(self, host: str, port: str) -> None:
        ztx = self.load_ziti_identity_from_string(
            os.environ.get("USECASE_DEPLOYMENT_ZITI_IDENTITY_JSON")
        )

        bindings = {
            (host, port): {
                "ztx": ztx,
            }
        }

        openziti.monkeypatch(bindings=bindings)

    def init_ziti_from_config_multi(self, bindings: dict) -> None:
        ztx = self.load_ziti_identity_from_string(
            os.environ.get("USECASE_DEPLOYMENT_ZITI_IDENTITY_JSON")
        )

        for addr in bindings:
            bindings[addr]["ztx"] = ztx

        openziti.monkeypatch(bindings=bindings)

Thanks
Dominik