From d34fe2840d969c30b393cfb73e34b6301027c776 Mon Sep 17 00:00:00 2001 From: rinpatch Date: Thu, 3 Sep 2020 23:15:22 +0300 Subject: [PATCH] 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. --- lib/pleroma/http/adapter_helper.ex | 4 - lib/pleroma/http/adapter_helper/gun.ex | 9 -- lib/pleroma/http/adapter_helper/hackney.ex | 3 - lib/pleroma/http/http.ex | 33 +++--- .../tesla/middleware/connection_pool.ex | 35 ++++++ .../tesla/middleware/follow_redirects.ex | 110 ------------------ 6 files changed, 48 insertions(+), 146 deletions(-) create mode 100644 lib/pleroma/tesla/middleware/connection_pool.ex delete mode 100644 lib/pleroma/tesla/middleware/follow_redirects.ex diff --git a/lib/pleroma/http/adapter_helper.ex b/lib/pleroma/http/adapter_helper.ex index 0728cbaa2..d72297323 100644 --- a/lib/pleroma/http/adapter_helper.ex +++ b/lib/pleroma/http/adapter_helper.ex @@ -19,7 +19,6 @@ defmodule Pleroma.HTTP.AdapterHelper do | {Connection.proxy_type(), Connection.host(), pos_integer()} @callback options(keyword(), URI.t()) :: keyword() - @callback get_conn(URI.t(), keyword()) :: {:ok, term()} | {:error, term()} @spec format_proxy(String.t() | tuple() | nil) :: proxy() | nil def format_proxy(nil), do: nil @@ -47,9 +46,6 @@ defmodule Pleroma.HTTP.AdapterHelper do |> adapter_helper().options(uri) end - @spec get_conn(URI.t(), keyword()) :: {:ok, keyword()} | {:error, atom()} - def get_conn(uri, opts), do: adapter_helper().get_conn(uri, opts) - defp adapter, do: Application.get_env(:tesla, :adapter) defp adapter_helper do diff --git a/lib/pleroma/http/adapter_helper/gun.ex b/lib/pleroma/http/adapter_helper/gun.ex index 02e20f2d1..4a967d8f2 100644 --- a/lib/pleroma/http/adapter_helper/gun.ex +++ b/lib/pleroma/http/adapter_helper/gun.ex @@ -6,7 +6,6 @@ defmodule Pleroma.HTTP.AdapterHelper.Gun do @behaviour Pleroma.HTTP.AdapterHelper alias Pleroma.Config - alias Pleroma.Gun.ConnectionPool alias Pleroma.HTTP.AdapterHelper require Logger @@ -57,14 +56,6 @@ defmodule Pleroma.HTTP.AdapterHelper.Gun do Config.get([:pools, pool, :timeout], default) 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 - @prefix Pleroma.Gun.ConnectionPool def limiter_setup do wait = Config.get([:connections_pool, :connection_acquisition_wait]) diff --git a/lib/pleroma/http/adapter_helper/hackney.ex b/lib/pleroma/http/adapter_helper/hackney.ex index cd569422b..f47a671ad 100644 --- a/lib/pleroma/http/adapter_helper/hackney.ex +++ b/lib/pleroma/http/adapter_helper/hackney.ex @@ -23,7 +23,4 @@ defmodule Pleroma.HTTP.AdapterHelper.Hackney do end defp add_scheme_opts(opts, _), do: opts - - @spec get_conn(URI.t(), keyword()) :: {:ok, keyword()} - def get_conn(_uri, opts), do: {:ok, opts} end diff --git a/lib/pleroma/http/http.ex b/lib/pleroma/http/http.ex index b37b3fa89..7bc73f4a0 100644 --- a/lib/pleroma/http/http.ex +++ b/lib/pleroma/http/http.ex @@ -62,28 +62,21 @@ defmodule Pleroma.HTTP do uri = URI.parse(url) adapter_opts = AdapterHelper.options(uri, options[:adapter] || []) - case AdapterHelper.get_conn(uri, adapter_opts) do - {:ok, adapter_opts} -> - options = put_in(options[:adapter], adapter_opts) - params = options[:params] || [] - request = build_request(method, headers, options, url, body, params) + options = put_in(options[:adapter], adapter_opts) + params = options[:params] || [] + request = build_request(method, headers, options, url, body, params) - adapter = Application.get_env(:tesla, :adapter) + adapter = Application.get_env(:tesla, :adapter) - client = Tesla.client(adapter_middlewares(adapter), adapter) + client = Tesla.client(adapter_middlewares(adapter), adapter) - maybe_limit( - fn -> - request(client, request) - end, - adapter, - adapter_opts - ) - - # Connection release is handled in a custom FollowRedirects middleware - err -> - err - end + maybe_limit( + fn -> + request(client, request) + end, + adapter, + adapter_opts + ) end @spec request(Client.t(), keyword()) :: {:ok, Env.t()} | {:error, any()} @@ -110,7 +103,7 @@ defmodule Pleroma.HTTP do end defp adapter_middlewares(Tesla.Adapter.Gun) do - [Pleroma.HTTP.Middleware.FollowRedirects] + [Tesla.Middleware.FollowRedirects, Pleroma.Tesla.Middleware.ConnectionPool] end defp adapter_middlewares(_), do: [] diff --git a/lib/pleroma/tesla/middleware/connection_pool.ex b/lib/pleroma/tesla/middleware/connection_pool.ex new file mode 100644 index 000000000..a435ab4cc --- /dev/null +++ b/lib/pleroma/tesla/middleware/connection_pool.ex @@ -0,0 +1,35 @@ +# Pleroma: A lightweight social networking server +# Copyright © 2020 Pleroma Authors +# SPDX-License-Identifier: AGPL-3.0-only + +defmodule Pleroma.Tesla.Middleware.ConnectionPool do + @moduledoc """ + Middleware to get/release connections from `Pleroma.Gun.ConnectionPool` + """ + + @behaviour Tesla.Middleware + + alias Pleroma.Gun.ConnectionPool + + @impl Tesla.Middleware + def call(%Tesla.Env{url: url, opts: opts} = env, next, _) do + uri = URI.parse(url) + + case ConnectionPool.get_conn(uri, opts[:adapter]) do + {:ok, conn_pid} -> + adapter_opts = Keyword.merge(opts[:adapter], conn: conn_pid, close_conn: false) + opts = Keyword.put(opts, :adapter, adapter_opts) + env = %{env | opts: opts} + res = Tesla.run(env, next) + + unless opts[:adapter][:body_as] == :chunks do + ConnectionPool.release_conn(conn_pid) + end + + res + + err -> + err + end + end +end diff --git a/lib/pleroma/tesla/middleware/follow_redirects.ex b/lib/pleroma/tesla/middleware/follow_redirects.ex deleted file mode 100644 index 5a7032215..000000000 --- a/lib/pleroma/tesla/middleware/follow_redirects.ex +++ /dev/null @@ -1,110 +0,0 @@ -# Pleroma: A lightweight social networking server -# Copyright © 2015-2020 Tymon Tobolski -# Copyright © 2020 Pleroma Authors -# SPDX-License-Identifier: AGPL-3.0-only - -defmodule Pleroma.HTTP.Middleware.FollowRedirects do - @moduledoc """ - Pool-aware version of https://github.com/teamon/tesla/blob/master/lib/tesla/middleware/follow_redirects.ex - - Follow 3xx redirects - ## Options - - `:max_redirects` - limit number of redirects (default: `5`) - """ - - alias Pleroma.Gun.ConnectionPool - - @behaviour Tesla.Middleware - - @max_redirects 5 - @redirect_statuses [301, 302, 303, 307, 308] - - @impl Tesla.Middleware - def call(env, next, opts \\ []) do - max = Keyword.get(opts, :max_redirects, @max_redirects) - - redirect(env, next, max) - end - - defp redirect(env, next, left) do - opts = env.opts[:adapter] - - case Tesla.run(env, next) do - {:ok, %{status: status} = res} when status in @redirect_statuses and left > 0 -> - release_conn(opts) - - case Tesla.get_header(res, "location") do - nil -> - {:ok, res} - - location -> - location = parse_location(location, res) - - case get_conn(location, opts) do - {:ok, opts} -> - %{env | opts: Keyword.put(env.opts, :adapter, opts)} - |> new_request(res.status, location) - |> redirect(next, left - 1) - - e -> - e - end - end - - {:ok, %{status: status}} when status in @redirect_statuses -> - release_conn(opts) - {:error, {__MODULE__, :too_many_redirects}} - - {:error, _} = e -> - release_conn(opts) - e - - other -> - unless opts[:body_as] == :chunks do - release_conn(opts) - end - - other - end - end - - defp get_conn(location, opts) do - uri = URI.parse(location) - - case ConnectionPool.get_conn(uri, opts) do - {:ok, conn} -> - {:ok, Keyword.merge(opts, conn: conn)} - - e -> - e - end - end - - defp release_conn(opts) do - ConnectionPool.release_conn(opts[:conn]) - end - - # The 303 (See Other) redirect was added in HTTP/1.1 to indicate that the originally - # requested resource is not available, however a related resource (or another redirect) - # available via GET is available at the specified location. - # https://tools.ietf.org/html/rfc7231#section-6.4.4 - defp new_request(env, 303, location), do: %{env | url: location, method: :get, query: []} - - # The 307 (Temporary Redirect) status code indicates that the target - # resource resides temporarily under a different URI and the user agent - # MUST NOT change the request method (...) - # https://tools.ietf.org/html/rfc7231#section-6.4.7 - defp new_request(env, 307, location), do: %{env | url: location} - - defp new_request(env, _, location), do: %{env | url: location, query: []} - - defp parse_location("https://" <> _rest = location, _env), do: location - defp parse_location("http://" <> _rest = location, _env), do: location - - defp parse_location(location, env) do - env.url - |> URI.parse() - |> URI.merge(location) - |> URI.to_string() - end -end