From adb1b0282dfbced2b2986c90cff765be37dd5151 Mon Sep 17 00:00:00 2001
From: rinpatch <rinpatch@sdf.org>
Date: Wed, 16 Sep 2020 17:23:05 +0300
Subject: [PATCH] ConnectionPool Worker: use monitor flush instead of checking
 ref

`:flush` removes the DOWN message if one had arrived, so this check
should no longer be necessary.
---
 lib/pleroma/gun/connection_pool/worker.ex | 25 ++++++++---------------
 1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/lib/pleroma/gun/connection_pool/worker.ex b/lib/pleroma/gun/connection_pool/worker.ex
index 49d41e4c7..bf57e9e5f 100644
--- a/lib/pleroma/gun/connection_pool/worker.ex
+++ b/lib/pleroma/gun/connection_pool/worker.ex
@@ -93,25 +93,18 @@ def handle_call(:remove_client, {client_pid, _}, %{key: key} = state) do
       end)
 
     {ref, state} = pop_in(state.client_monitors[client_pid])
-    # DOWN message can receive right after `remove_client` call and cause worker to terminate
-    state =
-      if is_nil(ref) do
-        state
+
+    Process.demonitor(ref, [:flush])
+
+    timer =
+      if used_by == [] do
+        max_idle = Pleroma.Config.get([:connections_pool, :max_idle_time], 30_000)
+        Process.send_after(self(), :idle_close, max_idle)
       else
-        Process.demonitor(ref)
-
-        timer =
-          if used_by == [] do
-            max_idle = Pleroma.Config.get([:connections_pool, :max_idle_time], 30_000)
-            Process.send_after(self(), :idle_close, max_idle)
-          else
-            nil
-          end
-
-        %{state | timer: timer}
+        nil
       end
 
-    {:reply, :ok, state, :hibernate}
+    {:reply, :ok, %{state | timer: timer}, :hibernate}
   end
 
   @impl true