65 lines
2.1 KiB
Python
65 lines
2.1 KiB
Python
#!/usr/bin/env python
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# coding: utf-8
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import errno
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from youtube_dl.utils import locked_file
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class Archive(object):
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""" Class that manages the download Archive. Provides optimizations to avoid
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excessive file parsing.
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Initializing options:
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filepath: str The filepath of the archive.
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Properties:
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_data: set Container for holding a cache of the archive
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_disabled: bool When true, all functions are effectively void
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filepath: str The filepath of the archive
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Methods:
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__contains__ Checks a video id (archive id) exists in archive
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_read_archive Reads archive from disk
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record_download Adds a new download to archive
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"""
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def __init__(self, filepath):
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""" Instantiate Archive
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filepath: str or None. The filepath of the archive. If None or empty
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string is provided instance can still be used
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but it's effectively doing nothing."""
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self.filepath = None if filepath == "" else filepath
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self._disabled = self.filepath is None
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self._data = set()
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def record_download(self, archive_id):
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""" Records a new archive_id in the archive """
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if self._disabled:
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return
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with locked_file(self.filepath, "a", encoding="utf-8") as file_out:
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file_out.write(archive_id + "\n")
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self._data.add(archive_id)
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def _read_file(self):
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""" Reads the data from archive file """
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if self._disabled:
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return
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try:
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with locked_file(self.filepath, "r", encoding="utf-8") as file_in:
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self._data.update(line.strip() for line in file_in)
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except IOError as err:
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if err.errno != errno.ENOENT:
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raise
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def __contains__(self, item):
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if not isinstance(item, str):
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raise ValueError(
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"An archive contains only strings. Provided {}".format(type(item)))
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if item not in self._data:
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self._read_file()
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return item in self._data
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