From: Mohamed Akram <mohd.akram@outlook.com>
Date: Mon, 18 Oct 2021 19:58:54 +0000 (+0400)
Subject: Reduce async overhead due to auto_await
X-Git-Tag: 3.0.3~8^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F1516%2Fhead;p=thirdparty%2Fjinja.git

Reduce async overhead due to auto_await
---

diff --git a/CHANGES.rst b/CHANGES.rst
index e859ab3f..ebd23b6a 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -9,6 +9,8 @@ Unreleased
     :issue:`1535`
 -   Fix how the native environment treats leading and trailing spaces
     when parsing values on Python 3.10. :pr:`1537`
+-   Improve async performance by avoiding checks for common types.
+    :issue:`1514`
 
 
 Version 3.0.2
diff --git a/src/jinja2/async_utils.py b/src/jinja2/async_utils.py
index cedd7ba8..35e6cb10 100644
--- a/src/jinja2/async_utils.py
+++ b/src/jinja2/async_utils.py
@@ -44,7 +44,14 @@ def async_variant(normal_func):  # type: ignore
     return decorator
 
 
+_common_primitives = {int, float, bool, str, list, dict, tuple, type(None)}
+
+
 async def auto_await(value: t.Union[t.Awaitable["V"], "V"]) -> "V":
+    # Avoid a costly call to isawaitable
+    if type(value) in _common_primitives:
+        return t.cast("V", value)
+
     if inspect.isawaitable(value):
         return await t.cast("t.Awaitable[V]", value)