akkoma/lib/pleroma/web/rich_media/parser.ex
href 4aff4efa8d
Use multiple hackney pools
* federation (ap, salmon)
* media (rich media, media proxy)
* upload (uploader proxy)

Each "part" will stop fighting others ones -- a huge federation outbound
could before make the media proxy fail to checkout a connection in time.

splitted media and uploaded media for the good reason than an upload
pool will have all connections to the same host (the uploader upstream).
it also has a longer default retention period for connections.
2019-01-30 15:06:46 +01:00

56 lines
1.4 KiB
Elixir

# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.RichMedia.Parser do
@parsers [
Pleroma.Web.RichMedia.Parsers.OGP,
Pleroma.Web.RichMedia.Parsers.TwitterCard,
Pleroma.Web.RichMedia.Parsers.OEmbed
]
def parse(nil), do: {:error, "No URL provided"}
if Mix.env() == :test do
def parse(url), do: parse_url(url)
else
def parse(url) do
try do
Cachex.fetch!(:rich_media_cache, url, fn _ ->
{:commit, parse_url(url)}
end)
rescue
e ->
{:error, "Cachex error: #{inspect(e)}"}
end
end
end
defp parse_url(url) do
try do
{:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url, [], pool: :media)
html |> maybe_parse() |> get_parsed_data()
rescue
e ->
{:error, "Parsing error: #{inspect(e)}"}
end
end
defp maybe_parse(html) do
Enum.reduce_while(@parsers, %{}, fn parser, acc ->
case parser.parse(html, acc) do
{:ok, data} -> {:halt, data}
{:error, _msg} -> {:cont, acc}
end
end)
end
defp get_parsed_data(%{title: title} = data) when is_binary(title) and byte_size(title) > 0 do
{:ok, data}
end
defp get_parsed_data(data) do
{:error, "Found metadata was invalid or incomplete: #{inspect(data)}"}
end
end