From 953a5ec89801edb7047a779bc443b40acf066a27 Mon Sep 17 00:00:00 2001
From: Takeshi KOMIYA <i.tkomiya@gmail.com>
Date: Thu, 12 Nov 2020 01:46:20 +0900
Subject: [PATCH] Fix #8350: autosummary_mock_imports causes slow down builds

The mock objects set up via `autosummary_mock_imports` causes slow down
of autosummary stub generation because AttributeDocumenter falls into
infinite recursion call to unwrap decorators of mocked objects.

To avoid the trouble, this blocks unwrapping decorators of mocked
objects.
---
 CHANGES                | 1 +
 sphinx/util/inspect.py | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index 5e30dc7ed3d..eb041082ff8 100644
--- a/CHANGES
+++ b/CHANGES
@@ -19,6 +19,7 @@ Bugs fixed
 * #8372: autodoc: autoclass directive became slower than Sphinx-3.2
 * #7727: autosummary: raise PycodeError when documenting python package
   without __init__.py
+* #8350: autosummary: autosummary_mock_imports causes slow down builds
 * #8364: C, properly initialize attributes in empty symbols.
 * #8399: i18n: Put system locale path after the paths specified by configuration
 
diff --git a/sphinx/util/inspect.py b/sphinx/util/inspect.py
index f2cd8070bb4..9f5bf785e09 100644
--- a/sphinx/util/inspect.py
+++ b/sphinx/util/inspect.py
@@ -122,7 +122,11 @@ def getargspec(func: Callable) -> Any:
 def unwrap(obj: Any) -> Any:
     """Get an original object from wrapped object (wrapped functions)."""
     try:
-        return inspect.unwrap(obj)
+        if hasattr(obj, '__sphinx_mock__'):
+            # Skip unwrapping mock object to avoid RecursionError
+            return obj
+        else:
+            return inspect.unwrap(obj)
     except ValueError:
         # might be a mock object
         return obj