usdpl-decky-plugin-template/main.py

import os

# The decky plugin module is located at decky-loader/plugin
# For easy intellisense checkout the decky-loader code repo
# and add the `decky-loader/plugin/imports` path to `python.analysis.extraPaths` in `.vscode/settings.json`
import pathlib
import subprocess
import asyncio
import os

HOME_DIR = str(pathlib.Path(os.getcwd()).parent.parent.resolve())
PARENT_DIR = str(pathlib.Path(__file__).parent.resolve())

LOG_LOCATION = "/tmp/usdpl-template.py.log"

# set up logging for Python back-end spawning
import logging

logging.basicConfig(
    filename = LOG_LOCATION,
    format = '%(asctime)s %(levelname)s %(message)s',
    filemode = 'w',
    force = True)

logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
logging.info(f"usdpl-decky-template main.py https://git.ngni.us/NG-SD-Plugins/usdpl-decky-plugin-template")

class Plugin:
    backend_proc = None
    # Asyncio-compatible long-running code, executed in a task when the plugin is loaded
    async def _main(self):
        # startup back-end
        self.backend_proc = subprocess.Popen(
            [PARENT_DIR + "/bin/backend"],
            env = dict(os.environ))
        while True: # keep running in case Decky checks; very likely unnecessary
            await asyncio.sleep(1)

    async def _unload(self):
        # gracefully stop the back-end, but kill if it doesn't exit quickly enough
        if self.backend_proc is not None:
            self.backend_proc.terminate()
            try:
                self.backend_proc.wait(timeout=5) # 5 seconds timeout
            except subprocess.TimeoutExpired:
                self.backend_proc.kill()
            self.backend_proc = None