akkoma/lib/pleroma/http/adapter_helper/gun.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

61 lines
1.6 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.HTTP.AdapterHelper.Gun do
@behaviour Pleroma.HTTP.AdapterHelper
alias Pleroma.Gun.ConnectionPool
alias Pleroma.HTTP.AdapterHelper
require Logger
@defaults [
connect_timeout: 5_000,
domain_lookup_timeout: 5_000,
tls_handshake_timeout: 5_000,
retry: 1,
retry_timeout: 1000,
await_up_timeout: 5_000
]
@spec options(keyword(), URI.t()) :: keyword()
def options(incoming_opts \\ [], %URI{} = uri) do
proxy =
Pleroma.Config.get([:http, :proxy_url])
|> AdapterHelper.format_proxy()
config_opts = Pleroma.Config.get([:http, :adapter], [])
@defaults
|> Keyword.merge(config_opts)
|> add_scheme_opts(uri)
|> AdapterHelper.maybe_add_proxy(proxy)
|> Keyword.merge(incoming_opts)
end
@spec after_request(keyword()) :: :ok
def after_request(opts) do
if opts[:conn] && opts[:body_as] != :chunks do
ConnectionPool.release_conn(opts[:conn])
end
:ok
end
defp add_scheme_opts(opts, %{scheme: "http"}), do: opts
defp add_scheme_opts(opts, %{scheme: "https"}) do
opts
|> Keyword.put(:certificates_verification, true)
|> Keyword.put(:tls_opts, log_level: :warning)
end
@spec get_conn(URI.t(), keyword()) :: {:ok, keyword()} | {:error, atom()}
def get_conn(uri, opts) do
case ConnectionPool.get_conn(uri, opts) do
{:ok, conn_pid} -> {:ok, Keyword.merge(opts, conn: conn_pid, close_conn: false)}
err -> err
end
end
end