akkoma/lib/pleroma/gun/conn.ex
rinpatch 58a4f350a8 Refactor gun pooling and simplify adapter option insertion
This patch refactors gun pooling to use Elixir process registry and
simplifies adapter option insertion.

Having the pool use process registry instead of a GenServer has a number of advantages:
- Simpler code: the initial implementation adds about half the lines of code it deletes
- Concurrency: unlike a GenServer, ETS-based registry can handle multiple checkout/checkin
requests at the same time
- Precise and easy idle connection clousure: current proposal for closing idle connections in
the GenServer-based pool needs to filter through all connections once a minute and compare their
last active time with closing time. With Elixir process registry this can be done
by just using `Process.send_after`/`Process.cancel_timer` in the worker process.
- Lower memory footprint: In my tests `gun-memory-leak` branch uses about 290mb on peak load (250 connections)
and 235mb on idle (5-10 connections). Registry-based pool uses 210mb on idle and 240mb on peak load
2020-07-15 15:17:27 +03:00

139 lines
3.6 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.Gun.Conn do
alias Pleroma.Gun
require Logger
def open(%URI{} = uri, opts) do
pool_opts = Pleroma.Config.get([:connections_pool], [])
opts =
opts
|> Enum.into(%{})
|> Map.put_new(:retry, pool_opts[:retry] || 1)
|> Map.put_new(:retry_timeout, pool_opts[:retry_timeout] || 1000)
|> Map.put_new(:await_up_timeout, pool_opts[:await_up_timeout] || 5_000)
|> Map.put_new(:supervise, false)
|> maybe_add_tls_opts(uri)
do_open(uri, opts)
end
defp maybe_add_tls_opts(opts, %URI{scheme: "http"}), do: opts
defp maybe_add_tls_opts(opts, %URI{scheme: "https", host: host}) do
tls_opts = [
verify: :verify_peer,
cacertfile: CAStore.file_path(),
depth: 20,
reuse_sessions: false,
verify_fun:
{&:ssl_verify_hostname.verify_fun/3,
[check_hostname: Pleroma.HTTP.AdapterHelper.format_host(host)]}
]
tls_opts =
if Keyword.keyword?(opts[:tls_opts]) do
Keyword.merge(tls_opts, opts[:tls_opts])
else
tls_opts
end
Map.put(opts, :tls_opts, tls_opts)
end
defp do_open(uri, %{proxy: {proxy_host, proxy_port}} = opts) do
connect_opts =
uri
|> destination_opts()
|> add_http2_opts(uri.scheme, Map.get(opts, :tls_opts, []))
with open_opts <- Map.delete(opts, :tls_opts),
{:ok, conn} <- Gun.open(proxy_host, proxy_port, open_opts),
{:ok, _} <- Gun.await_up(conn, opts[:await_up_timeout]),
stream <- Gun.connect(conn, connect_opts),
{:response, :fin, 200, _} <- Gun.await(conn, stream) do
{:ok, conn}
else
error ->
Logger.warn(
"Opening proxied connection to #{compose_uri_log(uri)} failed with error #{
inspect(error)
}"
)
error
end
end
defp do_open(uri, %{proxy: {proxy_type, proxy_host, proxy_port}} = opts) do
version =
proxy_type
|> to_string()
|> String.last()
|> case do
"4" -> 4
_ -> 5
end
socks_opts =
uri
|> destination_opts()
|> add_http2_opts(uri.scheme, Map.get(opts, :tls_opts, []))
|> Map.put(:version, version)
opts =
opts
|> Map.put(:protocols, [:socks])
|> Map.put(:socks_opts, socks_opts)
with {:ok, conn} <- Gun.open(proxy_host, proxy_port, opts),
{:ok, _} <- Gun.await_up(conn, opts[:await_up_timeout]) do
{:ok, conn}
else
error ->
Logger.warn(
"Opening socks proxied connection to #{compose_uri_log(uri)} failed with error #{
inspect(error)
}"
)
error
end
end
defp do_open(%URI{host: host, port: port} = uri, opts) do
host = Pleroma.HTTP.AdapterHelper.parse_host(host)
with {:ok, conn} <- Gun.open(host, port, opts),
{:ok, _} <- Gun.await_up(conn, opts[:await_up_timeout]) do
{:ok, conn}
else
error ->
Logger.warn(
"Opening connection to #{compose_uri_log(uri)} failed with error #{inspect(error)}"
)
error
end
end
defp destination_opts(%URI{host: host, port: port}) do
host = Pleroma.HTTP.AdapterHelper.parse_host(host)
%{host: host, port: port}
end
defp add_http2_opts(opts, "https", tls_opts) do
Map.merge(opts, %{protocols: [:http2], transport: :tls, tls_opts: tls_opts})
end
defp add_http2_opts(opts, _, _), do: opts
def compose_uri_log(%URI{scheme: scheme, host: host, path: path}) do
"#{scheme}://#{host}#{path}"
end
end