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.

config/config.exs

@@ -15,6 +15,20 @@
   seconds_valid: 60,
   method: Pleroma.Captcha.Kocaptcha
 
+config :pleroma, :hackney_pools,
+  federation: [
+    max_connections: 50,
+    timeout: 150_000
+  ],
+  media: [
+    max_connections: 50,
+    timeout: 150_000
+  ],
+  upload: [
+    max_connections: 25,
+    timeout: 300_000
+  ]
+
 config :pleroma, Pleroma.Captcha.Kocaptcha, endpoint: "https://captcha.kotobank.ch"
 
 # Upload configuration
@@ -22,7 +36,14 @@
   uploader: Pleroma.Uploaders.Local,
   filters: [],
   proxy_remote: false,
-  proxy_opts: []
+  proxy_opts: [
+    redirect_on_failure: false,
+    max_body_length: 25 * 1_048_576,
+    http: [
+      follow_redirect: true,
+      pool: :upload
+    ]
+  ]
 
 config :pleroma, Pleroma.Uploaders.Local, uploads: "uploads"
 
@@ -214,7 +235,16 @@
   reject: [],
   accept: []
 
-config :pleroma, :media_proxy, enabled: false
+config :pleroma, :media_proxy,
+  enabled: false,
+  proxy_opts: [
+    redirect_on_failure: false,
+    max_body_length: 25 * 1_048_576,
+    http: [
+      follow_redirect: true,
+      pool: :media
+    ]
+  ]
 
 config :pleroma, :chat, enabled: true
 

docs/config.md

@@ -234,3 +234,20 @@ curl "http://localhost:4000/api/pleroma/admin/invite_token?admin_token=somerando
   * Pleroma.Web.Metadata.Providers.OpenGraph
   * Pleroma.Web.Metadata.Providers.TwitterCard
 * `unfurl_nsfw`: If set to `true` nsfw attachments will be shown in previews
+
+## :hackney_pools
+
+Advanced. Tweaks Hackney (http client) connections pools.
+
+There's three pools used:
+
+* `:federation` for the federation jobs.
+  You may want this pool max_connections to be at least equal to the number of federator jobs + retry queue jobs.
+* `:media` for rich media, media proxy
+* `:upload` for uploaded media (if using a remote uploader and `proxy_remote: true`)
+
+For each pool, the options are:
+
+* `max_connections` - how much connections a pool can hold
+* `timeout` - retention duration for connections
+

lib/pleroma/application.ex

@@ -101,7 +101,10 @@ def start(_type, _args) do
           ],
           id: :cachex_idem
         ),
-        worker(Pleroma.FlakeId, []),
+        worker(Pleroma.FlakeId, [])
+      ] ++
+        hackney_pool_children() ++
+        [
           worker(Pleroma.Web.Federator.RetryQueue, []),
           worker(Pleroma.Web.Federator, []),
           worker(Pleroma.Stats, []),
@@ -121,6 +124,20 @@ def start(_type, _args) do
     Supervisor.start_link(children, opts)
   end
 
+  def enabled_hackney_pools() do
+    [:media] ++
+      if Application.get_env(:tesla, :adapter) == Tesla.Adapter.Hackney do
+        [:federation]
+      else
+        []
+      end ++
+      if Pleroma.Config.get([Pleroma.Uploader, :proxy_remote]) do
+        [:uploadproxy]
+      else
+        []
+      end
+  end
+
   if Mix.env() == :test do
     defp streamer_child(), do: []
     defp chat_child(), do: []
@@ -137,4 +154,11 @@ defp chat_child() do
       end
     end
   end
+
+  defp hackney_pool_children() do
+    for pool <- enabled_hackney_pools() do
+      options = Pleroma.Config.get([:hackney_pools, pool])
+      :hackney_pool.child_spec(pool, options)
+    end
+  end
 end

lib/pleroma/http/connection.ex

@@ -10,7 +10,8 @@ defmodule Pleroma.HTTP.Connection do
   @hackney_options [
     timeout: 10000,
     recv_timeout: 20000,
-    follow_redirect: true
+    follow_redirect: true,
+    pool: :federation
   ]
   @adapter Application.get_env(:tesla, :adapter)
 

lib/pleroma/uploaders/mdii.ex

@@ -24,7 +24,8 @@ def put_file(upload) do
     extension = String.split(upload.name, ".") |> List.last()
     query = "#{cgi}?#{extension}"
 
-    with {:ok, %{status: 200, body: body}} <- @httpoison.post(query, file_data) do
+    with {:ok, %{status: 200, body: body}} <-
+           @httpoison.post(query, file_data, adapter: [pool: :default]) do
       remote_file_name = String.split(body) |> List.first()
       public_url = "#{files}/#{remote_file_name}.#{extension}"
       {:ok, {:url, public_url}}

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -1311,7 +1311,8 @@ def suggestions(%{assigns: %{user: user}} = conn, _) do
                [],
                adapter: [
                  timeout: timeout,
-                 recv_timeout: timeout
+                 recv_timeout: timeout,
+                 pool: :default
                ]
              ),
            {:ok, data} <- Jason.decode(body) do

lib/pleroma/web/rich_media/parser.ex

@@ -28,7 +28,7 @@ def parse(url) do
 
   defp parse_url(url) do
     try do
-      {:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url)
+      {:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url, [], pool: :media)
 
       html |> maybe_parse() |> get_parsed_data()
     rescue

lib/pleroma/web/rich_media/parsers/oembed_parser.ex

@@ -20,7 +20,7 @@ defp get_oembed_url(nodes) do
   end
 
   defp get_oembed_data(url) do
-    {:ok, %Tesla.Env{body: json}} = Pleroma.HTTP.get(url)
+    {:ok, %Tesla.Env{body: json}} = Pleroma.HTTP.get(url, [], pool: :media)
 
     {:ok, data} = Jason.decode(json)