ReverseProxy: Fix a gun connection leak when there is an error with no

body

- Modify `close/1` function to do the same thing it does for hackney,
which is - close the client rather than the whole connection
- Release the connection when there is no body to chunk

lib/pleroma/reverse_proxy/client/tesla.ex

@@ -5,6 +5,8 @@
 defmodule Pleroma.ReverseProxy.Client.Tesla do
   @behaviour Pleroma.ReverseProxy.Client
 
+  alias Pleroma.Gun.ConnectionPool
+
   @type headers() :: [{String.t(), String.t()}]
   @type status() :: pos_integer()
 
@@ -31,6 +33,8 @@ def request(method, url, headers, body, opts \\ []) do
       if is_map(response.body) and method != :head do
         {:ok, response.status, response.headers, response.body}
       else
+        conn_pid = response.opts[:adapter][:conn]
+        ConnectionPool.release_conn(conn_pid)
         {:ok, response.status, response.headers}
       end
     else
@@ -48,7 +52,7 @@ def stream_body(%{pid: pid, opts: opts, fin: true}) do
     # if there were redirects we need to checkout old conn
     conn = opts[:old_conn] || opts[:conn]
 
-    if conn, do: :ok = Pleroma.Gun.ConnectionPool.release_conn(conn)
+    if conn, do: :ok = ConnectionPool.release_conn(conn)
 
     :done
   end
@@ -74,8 +78,7 @@ defp read_chunk!(%{pid: pid, stream: stream, opts: opts}) do
   @impl true
   @spec close(map) :: :ok | no_return()
   def close(%{pid: pid}) do
-    adapter = check_adapter()
-    adapter.close(pid)
+    ConnectionPool.release_conn(pid)
   end
 
   defp check_adapter do

lib/pleroma/reverse_proxy/reverse_proxy.ex

@@ -165,6 +165,9 @@ defp request(method, url, headers, opts) do
       {:ok, code, _, _} ->
         {:error, {:invalid_http_response, code}}
 
+      {:ok, code, _} ->
+        {:error, {:invalid_http_response, code}}
+
       {:error, error} ->
         {:error, error}
     end