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# 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
@moduledoc """
Struct for gun connection data
"""
alias Pleroma.Gun
alias Pleroma.Pool.Connections
require Logger
@type gun_state :: :init | :up | :down
@type conn_state :: :init | :active | :idle
@type t :: %__MODULE__{
conn: pid(),
gun_state: gun_state(),
conn_state: conn_state(),
used_by: [GenServer.from()],
awaited_by: [GenServer.from()],
last_reference: pos_integer(),
crf: float(),
retries: pos_integer()
}
defstruct conn: nil,
gun_state: :init,
conn_state: :init,
used_by: [],
awaited_by: [],
last_reference: 0,
crf: 1,
retries: 0
@spec open(URI.t(), atom(), keyword()) :: :ok
def open(%URI{} = uri, name, 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)
|> maybe_add_tls_opts(uri)
key = "#{uri.scheme}:#{uri.host}:#{uri.port}"
max_connections = pool_opts[:max_connections] || 125
with {:ok, conn_pid} <- try_open(name, uri, opts, max_connections) do
:ok = Gun.set_owner(conn_pid, Process.whereis(name))
Connections.update_conn(name, key, conn_pid)
else
_error -> Connections.remove_conn(name, key)
end
end
defp try_open(name, uri, opts, max_connections) do
if Connections.count(name) <= max_connections do
do_open(uri, opts)
else
close_least_used_and_do_open(name, uri, opts)
end
end
defp maybe_add_tls_opts(opts, %URI{scheme: "http"}), do: opts
defp maybe_add_tls_opts(opts, %URI{scheme: "https", host: host}) do
charlist_host =
host
|> to_charlist()
|> :idna.encode()
tls_opts = [
verify: :verify_peer,
cacertfile: CAStore.file_path(),
depth: 20,
reuse_sessions: false,
verify_fun: {&:ssl_verify_hostname.verify_fun/3, [check_hostname: charlist_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.Connection.format_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.Connection.format_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
defp close_least_used_and_do_open(name, uri, opts) do
with [{key, conn} | _conns] <- Connections.get_unused_conns(name),
:ok <- Gun.close(conn.conn) do
Connections.remove_conn(name, key)
do_open(uri, opts)
else
[] -> {:error, :pool_overflowed}
end
end
def compose_uri_log(%URI{scheme: scheme, host: host, path: path}) do
"#{scheme}://#{host}#{path}"
end
end
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