Fix asyncio event loop creation for Python 3.10+ compatibility

[NetPenguins]

Issue: Fix asyncio event loop creation for Python 3.10+ compatibility

Problem

Code Location
The current implementation of start_and_run_forever() fails on Python 3.10+ due to changes in asyncio.get_event_loop() behavior.
Breaking Change in 3.14

Error:

RuntimeError: There is no current event loop in thread 'MainThread'.

Root Cause

asyncio.get_event_loop() behavior changed in Python 3.10+:

• Python <3.10: Automatically creates event loop if none exists
• Python 3.10-3.13: Emits DeprecationWarning when no loop exists (Deprecation in 3.10+, PEP reference)
• Python 3.14+: Raises RuntimeError instead of creating loop (docs)

Solution

Explicitly create and set the event loop before use, following Python 3.10+ best practices.

Code Changes

File: mythic_container/mythic_service.py

Current code:

def start_and_run_forever():
    try:
        loop = asyncio.get_event_loop()
        loop.run_until_complete(start_services())
        loop.run_forever()
        logger.error("start_and_run_forever finished")
    except KeyboardInterrupt:
        sys.exit(0)

Proposed fix:

def start_and_run_forever():
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    try:
        loop.run_until_complete(start_services())
        loop.run_forever()
        logger.error("start_and_run_forever finished")
    except KeyboardInterrupt:
        sys.exit(0)
    finally:
        loop.close()

References

• Python 3.11 asyncio docs
• Python 3.14 changelog
• GitHub issue #93453