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import pprint
import sys
import unittest
import test_support
class HookWatcher:
def __init__(self):
self.frames = []
self.events = []
def callback(self, frame, event, arg):
self.add_event(event, frame)
def add_event(self, event, frame=None):
"""Add an event to the log."""
if frame is None:
frame = sys._getframe(1)
try:
frameno = self.frames.index(frame)
except ValueError:
frameno = len(self.frames)
self.frames.append(frame)
self.events.append((frameno, event, ident(frame)))
def get_events(self):
"""Remove calls to add_event()."""
disallowed = [ident(self.add_event.im_func), ident(ident)]
self.frames = None
return [item for item in self.events if item[2] not in disallowed]
class ProfileSimulator(HookWatcher):
def __init__(self):
self.stack = []
HookWatcher.__init__(self)
def callback(self, frame, event, arg):
self.dispatch[event](self, frame)
def trace_call(self, frame):
self.add_event('call', frame)
self.stack.append(frame)
def trace_return(self, frame):
self.add_event('return', frame)
self.stack.pop()
def trace_exception(self, frame):
if len(self.stack) >= 2 and frame is self.stack[-2]:
self.add_event('propogate-from', self.stack[-1])
self.stack.pop()
else:
self.add_event('ignore', frame)
dispatch = {
'call': trace_call,
'exception': trace_exception,
'return': trace_return,
}
class TestCaseBase(unittest.TestCase):
def check_events(self, callable, expected):
events = capture_events(callable, self.new_watcher())
if events != expected:
self.fail("Expected events:\n%s\nReceived events:\n%s"
% (pprint.pformat(expected), pprint.pformat(events)))
class ProfileHookTestCase(TestCaseBase):
def new_watcher(self):
return HookWatcher()
def test_simple(self):
def f(p):
pass
f_ident = ident(f)
self.check_events(f, [(1, 'call', f_ident),
(1, 'return', f_ident),
])
def test_exception(self):
def f(p):
1/0
f_ident = ident(f)
self.check_events(f, [(1, 'call', f_ident),
(1, 'exception', f_ident),
(0, 'exception', protect_ident),
])
def test_caught_exception(self):
def f(p):
try: 1/0
except: pass
f_ident = ident(f)
self.check_events(f, [(1, 'call', f_ident),
(1, 'exception', f_ident),
(1, 'return', f_ident),
])
def test_caught_nested_exception(self):
def f(p):
try: 1/0
except: pass
f_ident = ident(f)
self.check_events(f, [(1, 'call', f_ident),
(1, 'exception', f_ident),
(1, 'return', f_ident),
])
def test_nested_exception(self):
def f(p):
1/0
f_ident = ident(f)
self.check_events(f, [(1, 'call', f_ident),
(1, 'exception', f_ident),
# This isn't what I expected:
(0, 'exception', protect_ident),
# I expected this again:
# (1, 'exception', f_ident),
])
def test_exception_in_except_clause(self):
def f(p):
1/0
def g(p):
try:
f(p)
except:
try: f(p)
except: pass
f_ident = ident(f)
g_ident = ident(g)
self.check_events(g, [(1, 'call', g_ident),
(2, 'call', f_ident),
(2, 'exception', f_ident),
(1, 'exception', g_ident),
(3, 'call', f_ident),
(3, 'exception', f_ident),
(1, 'exception', g_ident),
(1, 'return', g_ident),
])
def test_exception_propogation(self):
def f(p):
1/0
def g(p):
try: f(p)
finally: p.add_event("falling through")
f_ident = ident(f)
g_ident = ident(g)
self.check_events(g, [(1, 'call', g_ident),
(2, 'call', f_ident),
(2, 'exception', f_ident),
(1, 'exception', g_ident),
(1, 'falling through', g_ident),
(0, 'exception', protect_ident),
])
def test_raise_twice(self):
def f(p):
try: 1/0
except: 1/0
f_ident = ident(f)
self.check_events(f, [(1, 'call', f_ident),
(1, 'exception', f_ident),
(1, 'exception', f_ident),
(0, 'exception', protect_ident)
])
def test_raise_reraise(self):
def f(p):
try: 1/0
except: raise
f_ident = ident(f)
self.check_events(f, [(1, 'call', f_ident),
(1, 'exception', f_ident),
(0, 'exception', protect_ident)
])
def test_raise(self):
def f(p):
raise Exception()
f_ident = ident(f)
self.check_events(f, [(1, 'call', f_ident),
(1, 'exception', f_ident),
(0, 'exception', protect_ident)
])
class ProfileSimulatorTestCase(TestCaseBase):
def new_watcher(self):
return ProfileSimulator()
def test_simple(self):
def f(p):
pass
f_ident = ident(f)
self.check_events(f, [(1, 'call', f_ident),
(1, 'return', f_ident),
])
def test_basic_exception(self):
def f(p):
1/0
f_ident = ident(f)
self.check_events(f, [(1, 'call', f_ident),
(1, 'ignore', f_ident),
(1, 'propogate-from', f_ident),
])
def ident(function):
if hasattr(function, "f_code"):
code = function.f_code
else:
code = function.func_code
return code.co_firstlineno, code.co_name
def protect(f, p):
try: f(p)
except: pass
protect_ident = ident(protect)
def capture_events(callable, p=None):
if p is None:
p = HookWatcher()
sys.setprofile(p.callback)
protect(callable, p)
sys.setprofile(None)
return p.get_events()[1:-1]
def show_events(callable):
import pprint
pprint.pprint(capture_events(callable))
def test_main():
loader = unittest.TestLoader()
suite = unittest.TestSuite()
suite.addTest(loader.loadTestsFromTestCase(ProfileHookTestCase))
suite.addTest(loader.loadTestsFromTestCase(ProfileSimulatorTestCase))
test_support.run_suite(suite)
if __name__ == "__main__":
test_main()
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