109 lines
3.2 KiB
Elixir
109 lines
3.2 KiB
Elixir
defmodule Mobilizon.Service.CleanOrphanMedia do
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@moduledoc """
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Service to clean orphan media
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"""
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Medias
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alias Mobilizon.Medias.File
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alias Mobilizon.Medias.Media
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alias Mobilizon.Storage.Repo
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import Ecto.Query
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@doc """
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Clean orphan media
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Remove media that is not attached to an entity, such as media uploads that were never used in entities.
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Options:
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* `grace_period` how old in hours can the media be before it's taken into account for deletion
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* `dry_run` just return the media that would have been deleted, don't actually delete it
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"""
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@spec clean(Keyword.t()) :: {:ok, list(Media.t())} | {:error, String.t()}
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def clean(opts \\ []) do
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medias = find_media(opts)
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if Keyword.get(opts, :dry_run, false) do
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{:ok, medias}
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else
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Enum.each(medias, fn media_list ->
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Enum.each(media_list, fn media ->
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Medias.delete_media(media, ignore_file_not_found: true)
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end)
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end)
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{:ok, medias}
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end
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end
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# Ecto doesn't currently allow us to use exists with a subquery,
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# so we can't create the union through Ecto
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# https://github.com/elixir-ecto/ecto/issues/3619
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@union_query [
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[from: "events", param: "picture_id"],
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[from: "events_medias", param: "media_id"],
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[from: "posts", param: "picture_id"],
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[from: "posts_medias", param: "media_id"],
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[from: "comments_medias", param: "media_id"]
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]
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|> Enum.map(fn [from: from, param: param] ->
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"SELECT 1 FROM #{from} WHERE #{from}.#{param} = m0.id"
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end)
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|> Enum.join(" UNION ")
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|> (&"NOT EXISTS(#{&1})").()
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@spec find_media(Keyword.t()) :: list(list(Media.t()))
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defp find_media(opts) do
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default_grace_period =
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Mobilizon.Config.get([:instance, :orphan_upload_grace_period_hours], 48)
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grace_period = Keyword.get(opts, :grace_period, default_grace_period)
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expiration_date = DateTime.add(DateTime.utc_now(), grace_period * -3600)
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query =
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from(m in Media,
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as: :media,
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distinct: true,
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join: a in Actor,
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on: a.id == m.actor_id,
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where: is_nil(a.domain),
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where: m.inserted_at < ^expiration_date,
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where: fragment(@union_query)
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)
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query
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|> Repo.all()
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|> Enum.filter(fn %Media{file: %File{url: url}} ->
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is_all_media_orphan?(url, expiration_date)
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end)
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|> Enum.chunk_by(fn %Media{file: %File{url: url}} ->
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url
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|> String.split("?", parts: 2)
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|> hd
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end)
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end
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def is_all_media_orphan?(url, expiration_date) do
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url
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|> Medias.get_all_media_by_url()
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|> Enum.all?(&is_media_orphan?(&1, expiration_date))
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end
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@spec is_media_orphan?(Media.t(), DateTime.t()) :: boolean()
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def is_media_orphan?(%Media{id: media_id}, expiration_date) do
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query =
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from(m in Media,
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as: :media,
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distinct: true,
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join: a in Actor,
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on: a.id == m.actor_id,
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where: m.id == ^media_id,
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where: is_nil(a.domain),
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where: m.inserted_at < ^expiration_date,
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where: fragment(@union_query)
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)
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Repo.exists?(query)
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end
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end
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