0163e85e76
* Added methods for deleting outdated files * Hooked up outdated file deletion to media download worker
54 lines
2.3 KiB
Elixir
54 lines
2.3 KiB
Elixir
defmodule Pinchflat.Media.FileDeletion do
|
|
@moduledoc """
|
|
Functions for deleting files that are no longer needed by media items.
|
|
"""
|
|
|
|
alias Pinchflat.Utils.MapUtils
|
|
alias Pinchflat.Media.MediaItem
|
|
alias Pinchflat.Utils.FilesystemUtils, as: FSUtils
|
|
|
|
@doc """
|
|
Deletes files that are no longer needed by a media item.
|
|
|
|
This means that if a media item has been updated, the old and new versions
|
|
can be passed and any files that are no longer needed will be deleted.
|
|
|
|
An example is a video that gets its quality upgraded and its name changes
|
|
between original download and re-download. The old file will exist on-disk
|
|
with the old name but the database entry will point to the new file. This
|
|
function can be used to delete the old file in this case.
|
|
|
|
Returns :ok
|
|
"""
|
|
def delete_outdated_files(old_media_item, new_media_item) do
|
|
non_subtitle_keys = MediaItem.filepath_attributes() -- [:subtitle_filepaths]
|
|
|
|
old_non_subtitles = Map.take(old_media_item, non_subtitle_keys)
|
|
old_subtitles = MapUtils.from_nested_list(old_media_item.subtitle_filepaths)
|
|
new_non_subtitles = Map.take(new_media_item, non_subtitle_keys)
|
|
new_subtitles = MapUtils.from_nested_list(new_media_item.subtitle_filepaths)
|
|
|
|
handle_file_deletion(old_non_subtitles, new_non_subtitles)
|
|
handle_file_deletion(old_subtitles, new_subtitles)
|
|
|
|
:ok
|
|
end
|
|
|
|
defp handle_file_deletion(old_attributes, new_attributes) do
|
|
# The logic:
|
|
# - A file should only be deleted if it exists and the new file is different
|
|
# - The new attributes are the ones we're interested in keeping
|
|
# - If the old attributes have a key that doesn't exist in the new attributes, don't touch it.
|
|
# This is good for archiving but may be unpopular for other users so this may change.
|
|
|
|
Enum.each(new_attributes, fn {key, new_filepath} ->
|
|
old_filepath = Map.get(old_attributes, key)
|
|
files_have_changed = old_filepath && new_filepath && old_filepath != new_filepath
|
|
files_exist_on_disk = files_have_changed && File.exists?(old_filepath) && File.exists?(new_filepath)
|
|
|
|
if files_exist_on_disk && !FSUtils.filepaths_reference_same_file?(old_filepath, new_filepath) do
|
|
FSUtils.delete_file_and_remove_empty_directories(old_filepath)
|
|
end
|
|
end)
|
|
end
|
|
end
|