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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.RichMedia.Backfill do
alias Pleroma.Web.RichMedia.Card
alias Pleroma.Web.RichMedia.Parser
alias Pleroma.Web.RichMedia.Parser.TTL
alias Pleroma.Workers.RichMediaExpirationWorker
require Logger
@backfiller Pleroma.Config.get([__MODULE__, :provider], Pleroma.Web.RichMedia.Backfill.Task)
@cachex Pleroma.Config.get([:cachex, :provider], Cachex)
@max_attempts 3
@retry 5_000
def start(%{url: url} = args) when is_binary(url) do
url_hash = Card.url_to_hash(url)
args =
args
|> Map.put(:attempt, 1)
|> Map.put(:url_hash, url_hash)
@backfiller.run(args)
end
def run(%{url: url, url_hash: url_hash, attempt: attempt} = args)
when attempt <= @max_attempts do
case Parser.parse(url) do
{:ok, fields} ->
{:ok, card} = Card.create(url, fields)
maybe_schedule_expiration(url, fields)
if Map.has_key?(args, :activity_id) do
stream_update(args)
end
warm_cache(url_hash, card)
{:error, {:invalid_metadata, fields}} ->
Logger.debug("Rich media incomplete or invalid metadata for #{url}: #{inspect(fields)}")
negative_cache(url_hash)
{:error, :body_too_large} ->
Logger.error("Rich media error for #{url}: :body_too_large")
negative_cache(url_hash)
{:error, {:content_type, type}} ->
Logger.debug("Rich media error for #{url}: :content_type is #{type}")
negative_cache(url_hash)
e ->
Logger.debug("Rich media error for #{url}: #{inspect(e)}")
:timer.sleep(@retry * attempt)
run(%{args | attempt: attempt + 1})
end
end
def run(%{url: url, url_hash: url_hash}) do
Logger.debug("Rich media failure for #{url}")
negative_cache(url_hash, :timer.minutes(15))
end
defp maybe_schedule_expiration(url, fields) do
case TTL.process(fields, url) do
{:ok, ttl} when is_number(ttl) ->
timestamp = DateTime.from_unix!(ttl)
RichMediaExpirationWorker.new(%{"url" => url}, scheduled_at: timestamp)
|> Oban.insert()
_ ->
:ok
end
end
defp stream_update(%{activity_id: activity_id}) do
Pleroma.Activity.get_by_id(activity_id)
|> Pleroma.Activity.normalize()
|> Pleroma.Web.ActivityPub.ActivityPub.stream_out()
end
defp warm_cache(key, val), do: @cachex.put(:rich_media_cache, key, val)
defp negative_cache(key, ttl \\ nil), do: @cachex.put(:rich_media_cache, key, nil, ttl: ttl)
end
defmodule Pleroma.Web.RichMedia.Backfill.Task do
alias Pleroma.Web.RichMedia.Backfill
def run(args) do
Task.Supervisor.start_child(Pleroma.TaskSupervisor, Backfill, :run, [args],
name: {:global, {:rich_media, args.url_hash}}
)
end
end
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