197 lines
6.8 KiB
Python
197 lines
6.8 KiB
Python
import hashlib
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import logging
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import os
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import stat
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import time
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from queue import Empty, Queue
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from threading import Thread
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from typing import Optional
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import requests
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from libretime_api_client.v2 import ApiClient
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from .events import FileEvent, FileEvents
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logger = logging.getLogger(__name__)
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class PypoFile(Thread):
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name = "file"
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daemon = True
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file_events_queue: Queue[FileEvents]
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file_events: FileEvents
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def __init__(
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self,
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file_queue: Queue[FileEvents],
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api_client: ApiClient,
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):
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Thread.__init__(self)
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self.file_events_queue = file_queue
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self.file_events = {}
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self.api_client = api_client
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def copy_file(self, file_event: FileEvent):
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"""
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Copy file_event from local library directory to local cache directory.
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"""
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file_id = file_event["id"]
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dst = file_event["dst"]
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dst_exists = True
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try:
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dst_size = os.path.getsize(dst)
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if dst_size == 0:
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dst_exists = False
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except Exception:
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dst_exists = False
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do_copy = False
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if dst_exists:
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# TODO: Check if the locally cached variant of the file is sane.
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# This used to be a filesize check that didn't end up working.
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# Once we have watched folders updated files from them might
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# become an issue here... This needs proper cache management.
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# https://github.com/libretime/libretime/issues/756#issuecomment-477853018
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# https://github.com/libretime/libretime/pull/845
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logger.debug("found file %s in cache %s, skipping copy...", file_id, dst)
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else:
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do_copy = True
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file_event["file_ready"] = not do_copy
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if do_copy:
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logger.info("copying file %s to cache %s", file_id, dst)
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try:
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with open(dst, "wb") as handle:
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logger.info(file_event)
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try:
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response = self.api_client.download_file(file_id, stream=True)
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for chunk in response.iter_content(chunk_size=2048):
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handle.write(chunk)
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except requests.exceptions.HTTPError as exception:
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raise RuntimeError(
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f"could not download file {file_event['id']}"
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) from exception
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# make file world readable and owner writable
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os.chmod(dst, stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH)
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if file_event["filesize"] == 0:
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file_size = self.report_file_size_and_md5_to_api(
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dst, file_event["id"]
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)
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file_event["filesize"] = file_size
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file_event["file_ready"] = True
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except Exception as exception:
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logger.exception(
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"could not copy file %s to %s: %s",
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file_id,
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dst,
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exception,
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)
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def report_file_size_and_md5_to_api(self, file_path: str, file_id: int) -> int:
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try:
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file_size = os.path.getsize(file_path)
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with open(file_path, "rb") as file_fd:
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hasher = hashlib.md5(usedforsecurity=False)
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while True:
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data = file_fd.read(8192)
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if not data:
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break
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hasher.update(data)
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md5_hash = hasher.hexdigest()
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except OSError as exception:
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file_size = 0
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logger.exception(
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"Error getting file size and md5 hash for file id %s: %s",
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file_id,
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exception,
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)
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# Make PUT request to LibreTime to update the file size and hash
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error_msg = f"Could not update media file {file_id} with file size and md5 hash"
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try:
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self.api_client.update_file(
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file_id,
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json={"filesize": file_size, "md5": md5_hash},
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)
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except (requests.exceptions.ConnectionError, requests.exceptions.Timeout):
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logger.exception(error_msg)
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except Exception as exception:
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logger.exception("%s: %s", error_msg, exception)
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return file_size
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def get_highest_priority_file_event(
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self,
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file_events: FileEvents,
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) -> Optional[FileEvent]:
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"""
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Get highest priority file event in the queue. Currently the highest
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priority is decided by how close the start time is to "now".
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"""
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if file_events is None or len(file_events) == 0:
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return None
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sorted_keys = sorted(file_events.keys())
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if len(sorted_keys) == 0:
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return None
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highest_priority = sorted_keys[0]
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file_event = file_events[highest_priority]
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logger.debug("Highest priority item: %s", highest_priority)
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# Remove this media_item from the dictionary. On the next iteration
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# (from the main function) we won't consider it for prioritization
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# anymore. If on the next iteration we have received a new schedule,
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# it is very possible we will have to deal with the same media_items
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# again. In this situation, the worst possible case is that we try to
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# copy the file again and realize we already have it (thus aborting the copy).
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del file_events[highest_priority]
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return file_event
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def main(self):
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while True:
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try:
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if self.file_events is None or len(self.file_events) == 0:
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# We have no schedule, so we have nothing else to do. Let's
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# do a blocked wait on the queue
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self.file_events = self.file_events_queue.get(block=True)
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else:
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# We have a schedule we need to process, but we also want
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# to check if a newer schedule is available. In this case
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# do a non-blocking queue.get and in either case (we get something
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# or we don't), get back to work on preparing getting files.
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try:
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self.file_events = self.file_events_queue.get_nowait()
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except Empty:
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pass
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file_event = self.get_highest_priority_file_event(self.file_events)
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if file_event is not None:
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self.copy_file(file_event)
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except Exception as exception:
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logger.exception(exception)
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raise exception
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def run(self):
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"""
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Entry point of the thread
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"""
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try:
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self.main()
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except Exception as exception:
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logger.exception(exception)
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time.sleep(5)
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logger.info("PypoFile thread exiting")
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