From 0d9e639f4facbd69eb353aa01893bc7d8ac4b2e3 Mon Sep 17 00:00:00 2001
From: Lonami <totufals@hotmail.com>
Date: Thu, 4 Jul 2019 15:34:51 +0200
Subject: [PATCH] Support asynchronous progress_callback's

---
 telethon/client/downloads.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/telethon/client/downloads.py b/telethon/client/downloads.py
index 10e22781..bb129724 100644
--- a/telethon/client/downloads.py
+++ b/telethon/client/downloads.py
@@ -3,6 +3,7 @@ import io
 import os
 import pathlib
 import typing
+import inspect
 
 from .. import utils, helpers, errors, hints
 from ..requestiter import RequestIter
@@ -434,7 +435,9 @@ class DownloadMethods:
                     input_location, request_size=part_size, dc_id=dc_id):
                 f.write(chunk)
                 if progress_callback:
-                    progress_callback(f.tell(), file_size)
+                    r = progress_callback(f.tell(), file_size)
+                    if inspect.isawaitable(r):
+                        await r
 
             f.flush()
             if in_memory: