88 lines
2.3 KiB
Python
88 lines
2.3 KiB
Python
import asyncio
|
|
import functools
|
|
import logging
|
|
from io import BytesIO
|
|
from threading import Lock
|
|
from typing import Optional
|
|
|
|
from apscheduler.schedulers.asyncio import AsyncIOScheduler
|
|
from webdav3.client import Resource
|
|
|
|
_logger = logging.getLogger(__name__)
|
|
|
|
|
|
def run_in_executor(f):
|
|
"""
|
|
Decorator to make blocking function call asyncio compatible
|
|
https://stackoverflow.com/questions/41063331/how-to-use-asyncio-with-existing-blocking-library/
|
|
"""
|
|
|
|
@functools.wraps(f)
|
|
def inner(*args, **kwargs):
|
|
loop = asyncio.get_running_loop()
|
|
return loop.run_in_executor(None, functools.partial(f, *args, **kwargs))
|
|
|
|
return inner
|
|
|
|
|
|
class DavFile:
|
|
__instances: Optional[list["DavFile"]] = None
|
|
__scheduler = None
|
|
|
|
def __init__(self, resource: Resource, refresh: bool = True) -> None:
|
|
self.__resource: Resource = resource
|
|
self.__buffer = BytesIO()
|
|
self.__lock = Lock()
|
|
|
|
# register
|
|
if DavFile.__instances is None:
|
|
DavFile.__instances = []
|
|
|
|
if refresh:
|
|
DavFile.__instances.append(self)
|
|
|
|
async def download(self) -> None:
|
|
|
|
@run_in_executor
|
|
def download_inner() -> None:
|
|
self.__resource.write_to(self.__buffer)
|
|
|
|
_logger.info(f"updating {self.__resource}")
|
|
with self.__lock:
|
|
self.__buffer.seek(0)
|
|
self.__buffer.truncate(0)
|
|
await download_inner()
|
|
|
|
@classmethod
|
|
def refresh(cls, refresh_interval: int = 60) -> None:
|
|
if cls.__scheduler is not None:
|
|
cls.__scheduler.reschedule_job(
|
|
job_id=cls.__name__,
|
|
trigger="interval",
|
|
seconds=refresh_interval,
|
|
)
|
|
return
|
|
|
|
async def tick() -> None:
|
|
for davfile in DavFile.__instances:
|
|
await davfile.download()
|
|
|
|
cls.__scheduler = AsyncIOScheduler()
|
|
cls.__scheduler.start()
|
|
|
|
cls.__scheduler.add_job(tick)
|
|
cls.__scheduler.add_job(
|
|
tick,
|
|
id=cls.__name__,
|
|
trigger="interval",
|
|
seconds=refresh_interval,
|
|
)
|
|
|
|
@property
|
|
def bytes(self) -> bytes:
|
|
with self.__lock:
|
|
self.__buffer.seek(0)
|
|
return self.__buffer.read()
|
|
|
|
def __str__(self) -> str:
|
|
return self.bytes.decode(encoding="utf-8")
|