distraction.party/lib/pleroma/http/adapter_helper.ex
rinpatch d34fe2840d HTTP: radically simplify pool checkin/checkout
Use a custom tesla middleware instead of adapter helper function +
custom redirect middleware.

This will also fix "Client died before releasing the connection"
messages when the request pool is overloaded. Since the checkout is
now done after passing ConcurrentLimiter.

This is technically less efficient, since the connection needs to be
checked in/out every time the middleware is left or entered respectively.
But I don't think the nanoseconds we might lose on redirects
to the same host are worth the complexity.
2020-09-03 23:44:13 +03:00

121 lines
3.3 KiB
Elixir

# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.HTTP.AdapterHelper do
@moduledoc """
Configure Tesla.Client with default and customized adapter options.
"""
@defaults [pool: :federation]
@type proxy_type() :: :socks4 | :socks5
@type host() :: charlist() | :inet.ip_address()
alias Pleroma.HTTP.AdapterHelper
require Logger
@type proxy ::
{Connection.host(), pos_integer()}
| {Connection.proxy_type(), Connection.host(), pos_integer()}
@callback options(keyword(), URI.t()) :: keyword()
@spec format_proxy(String.t() | tuple() | nil) :: proxy() | nil
def format_proxy(nil), do: nil
def format_proxy(proxy_url) do
case parse_proxy(proxy_url) do
{:ok, host, port} -> {host, port}
{:ok, type, host, port} -> {type, host, port}
_ -> nil
end
end
@spec maybe_add_proxy(keyword(), proxy() | nil) :: keyword()
def maybe_add_proxy(opts, nil), do: opts
def maybe_add_proxy(opts, proxy), do: Keyword.put_new(opts, :proxy, proxy)
@doc """
Merge default connection & adapter options with received ones.
"""
@spec options(URI.t(), keyword()) :: keyword()
def options(%URI{} = uri, opts \\ []) do
@defaults
|> Keyword.merge(opts)
|> adapter_helper().options(uri)
end
defp adapter, do: Application.get_env(:tesla, :adapter)
defp adapter_helper do
case adapter() do
Tesla.Adapter.Gun -> AdapterHelper.Gun
Tesla.Adapter.Hackney -> AdapterHelper.Hackney
_ -> AdapterHelper.Default
end
end
@spec parse_proxy(String.t() | tuple() | nil) ::
{:ok, host(), pos_integer()}
| {:ok, proxy_type(), host(), pos_integer()}
| {:error, atom()}
| nil
def parse_proxy(nil), do: nil
def parse_proxy(proxy) when is_binary(proxy) do
with [host, port] <- String.split(proxy, ":"),
{port, ""} <- Integer.parse(port) do
{:ok, parse_host(host), port}
else
{_, _} ->
Logger.warn("Parsing port failed #{inspect(proxy)}")
{:error, :invalid_proxy_port}
:error ->
Logger.warn("Parsing port failed #{inspect(proxy)}")
{:error, :invalid_proxy_port}
_ ->
Logger.warn("Parsing proxy failed #{inspect(proxy)}")
{:error, :invalid_proxy}
end
end
def parse_proxy(proxy) when is_tuple(proxy) do
with {type, host, port} <- proxy do
{:ok, type, parse_host(host), port}
else
_ ->
Logger.warn("Parsing proxy failed #{inspect(proxy)}")
{:error, :invalid_proxy}
end
end
@spec parse_host(String.t() | atom() | charlist()) :: charlist() | :inet.ip_address()
def parse_host(host) when is_list(host), do: host
def parse_host(host) when is_atom(host), do: to_charlist(host)
def parse_host(host) when is_binary(host) do
host = to_charlist(host)
case :inet.parse_address(host) do
{:error, :einval} -> host
{:ok, ip} -> ip
end
end
@spec format_host(String.t()) :: charlist()
def format_host(host) do
host_charlist = to_charlist(host)
case :inet.parse_address(host_charlist) do
{:error, :einval} ->
:idna.encode(host_charlist)
{:ok, _ip} ->
host_charlist
end
end
end