extended Traceback to fetch current stack frame if no exception is in progress...

extended Traceback to fetch current stack frame if no exception is in progress and no stack frame is given

CHANGELOG.md

 # v2.11.26
 
 * fix exception hierarchy in futures
+* extended Traceback to fetch current stack frame if no exception is in progress and no stack frame is given

docs/instrumentation/traceback.rst

@@ -33,6 +33,8 @@ Usage:
 
 Traceback should be created in the exception it is supposed to capture,
 as it captures exception info from _sys.exc_info()_.
+If no exception is in progress, current stack frame will be fetched
+from `inspect.currentframe()`.
 
 Alternatively, you can pass a `<frame>` object to Traceback, in order to serialize it, for example:
 

satella/__init__.py

-__version__ = '2.11.26_a3'
+__version__ = '2.11.26_a4'

satella/instrumentation/trace_back/trace_back.py

@@ -42,16 +42,16 @@ class Traceback(JSONAble):
         else:
             value_pickling_policy = policy
 
-        tb = sys.exc_info()[2]
-
         self.frames = []  # type: tp.List[StackFrame]
 
         if starting_frame is None:
-            if tb is None:
-                raise ValueError('No traceback')
-            while tb.tb_next:
-                tb = tb.tb_next
-            f = tb.tb_frame
+            tb = sys.exc_info()[2]
+            if tb is not None:
+                while tb.tb_next:
+                    tb = tb.tb_next
+                f = tb.tb_frame
+            else:
+                f = inspect.currentframe()
         else:
             f = starting_frame
 

tests/test_instrumentation/test_trace_back.py

@@ -7,7 +7,7 @@ from satella.instrumentation import Traceback
 
 class TestTraceback(unittest.TestCase):
     def test_no_exc(self):
-        self.assertRaises(ValueError, Traceback)
+        Traceback()
 
     def test_json(self):
         try: