From d3e0301aeeb7e4df992bc75a22b699629297d9cf Mon Sep 17 00:00:00 2001
From: He Yin Ling <heyinling@espressif.com>
Date: Fri, 22 Nov 2019 15:49:40 +0800
Subject: [PATCH] tiny-test-fw: only load module from the same file one time:

we should only load one module once.
if we load one module twice, python will regard the same object loaded in the first time and second time as different objects.
it will lead to strange errors like `isinstance(object, type_of_this_object)` return False
---
 tools/tiny-test-fw/Utility/__init__.py | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/tools/tiny-test-fw/Utility/__init__.py b/tools/tiny-test-fw/Utility/__init__.py
index 2a0759a7bc..fbd2989bb0 100644
--- a/tools/tiny-test-fw/Utility/__init__.py
+++ b/tools/tiny-test-fw/Utility/__init__.py
@@ -38,11 +38,23 @@ def console_log(data, color="white", end="\n"):
     sys.stdout.flush()
 
 
+__LOADED_MODULES = dict()
+# we should only load one module once.
+# if we load one module twice,
+# python will regard the same object loaded in the first time and second time as different objects.
+# it will lead to strange errors like `isinstance(object, type_of_this_object)` return False
+
+
 def load_source(name, path):
     try:
-        from importlib.machinery import SourceFileLoader
-        return SourceFileLoader(name, path).load_module()
-    except ImportError:
-        # importlib.machinery doesn't exists in Python 2 so we will use imp (deprecated in Python 3)
-        import imp
-        return imp.load_source(name, path)
+        return __LOADED_MODULES[name]
+    except KeyError:
+        try:
+            from importlib.machinery import SourceFileLoader
+            ret = SourceFileLoader(name, path).load_module()
+        except ImportError:
+            # importlib.machinery doesn't exists in Python 2 so we will use imp (deprecated in Python 3)
+            import imp
+            ret = imp.load_source(name, path)
+        __LOADED_MODULES[name] = ret
+        return ret