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from __future__ import print_function
import sys
import greenlet
import unittest
from . import TestCase
from . import PY312
# https://discuss.python.org/t/cpython-3-12-greenlet-and-tracing-profiling-how-to-not-crash-and-get-correct-results/33144/2
DEBUG_BUILD_PY312 = (
PY312 and hasattr(sys, 'gettotalrefcount'),
"Broken on debug builds of Python 3.12"
)
class SomeError(Exception):
pass
class GreenletTracer(object):
oldtrace = None
def __init__(self, error_on_trace=False):
self.actions = []
self.error_on_trace = error_on_trace
def __call__(self, *args):
self.actions.append(args)
if self.error_on_trace:
raise SomeError
def __enter__(self):
self.oldtrace = greenlet.settrace(self)
return self.actions
def __exit__(self, *args):
greenlet.settrace(self.oldtrace)
class TestGreenletTracing(TestCase):
"""
Tests of ``greenlet.settrace()``
"""
def test_a_greenlet_tracing(self):
main = greenlet.getcurrent()
def dummy():
pass
def dummyexc():
raise SomeError()
with GreenletTracer() as actions:
g1 = greenlet.greenlet(dummy)
g1.switch()
g2 = greenlet.greenlet(dummyexc)
self.assertRaises(SomeError, g2.switch)
self.assertEqual(actions, [
('switch', (main, g1)),
('switch', (g1, main)),
('switch', (main, g2)),
('throw', (g2, main)),
])
def test_b_exception_disables_tracing(self):
main = greenlet.getcurrent()
def dummy():
main.switch()
g = greenlet.greenlet(dummy)
g.switch()
with GreenletTracer(error_on_trace=True) as actions:
self.assertRaises(SomeError, g.switch)
self.assertEqual(greenlet.gettrace(), None)
self.assertEqual(actions, [
('switch', (main, g)),
])
def test_set_same_tracer_twice(self):
# https://github.com/python-greenlet/greenlet/issues/332
# Our logic in asserting that the tracefunction should
# gain a reference was incorrect if the same tracefunction was set
# twice.
tracer = GreenletTracer()
with tracer:
greenlet.settrace(tracer)
class PythonTracer(object):
oldtrace = None
def __init__(self):
self.actions = []
def __call__(self, frame, event, arg):
# Record the co_name so we have an idea what function we're in.
self.actions.append((event, frame.f_code.co_name))
def __enter__(self):
self.oldtrace = sys.setprofile(self)
return self.actions
def __exit__(self, *args):
sys.setprofile(self.oldtrace)
def tpt_callback():
return 42
class TestPythonTracing(TestCase):
"""
Tests of the interaction of ``sys.settrace()``
with greenlet facilities.
NOTE: Most of this is probably CPython specific.
"""
maxDiff = None
def test_trace_events_trivial(self):
with PythonTracer() as actions:
tpt_callback()
# If we use the sys.settrace instead of setprofile, we get
# this:
# self.assertEqual(actions, [
# ('call', 'tpt_callback'),
# ('call', '__exit__'),
# ])
self.assertEqual(actions, [
('return', '__enter__'),
('call', 'tpt_callback'),
('return', 'tpt_callback'),
('call', '__exit__'),
('c_call', '__exit__'),
])
def _trace_switch(self, glet):
with PythonTracer() as actions:
glet.switch()
return actions
def _check_trace_events_func_already_set(self, glet):
actions = self._trace_switch(glet)
self.assertEqual(actions, [
('return', '__enter__'),
('c_call', '_trace_switch'),
('call', 'run'),
('call', 'tpt_callback'),
('return', 'tpt_callback'),
('return', 'run'),
('c_return', '_trace_switch'),
('call', '__exit__'),
('c_call', '__exit__'),
])
def test_trace_events_into_greenlet_func_already_set(self):
def run():
return tpt_callback()
self._check_trace_events_func_already_set(greenlet.greenlet(run))
def test_trace_events_into_greenlet_subclass_already_set(self):
class X(greenlet.greenlet):
def run(self):
return tpt_callback()
self._check_trace_events_func_already_set(X())
def _check_trace_events_from_greenlet_sets_profiler(self, g, tracer):
g.switch()
tpt_callback()
tracer.__exit__()
self.assertEqual(tracer.actions, [
('return', '__enter__'),
('call', 'tpt_callback'),
('return', 'tpt_callback'),
('return', 'run'),
('call', 'tpt_callback'),
('return', 'tpt_callback'),
('call', '__exit__'),
('c_call', '__exit__'),
])
def test_trace_events_from_greenlet_func_sets_profiler(self):
tracer = PythonTracer()
def run():
tracer.__enter__()
return tpt_callback()
self._check_trace_events_from_greenlet_sets_profiler(greenlet.greenlet(run),
tracer)
def test_trace_events_from_greenlet_subclass_sets_profiler(self):
tracer = PythonTracer()
class X(greenlet.greenlet):
def run(self):
tracer.__enter__()
return tpt_callback()
self._check_trace_events_from_greenlet_sets_profiler(X(), tracer)
@unittest.skipIf(*DEBUG_BUILD_PY312)
def test_trace_events_multiple_greenlets_switching(self):
tracer = PythonTracer()
g1 = None
g2 = None
def g1_run():
tracer.__enter__()
tpt_callback()
g2.switch()
tpt_callback()
return 42
def g2_run():
tpt_callback()
tracer.__exit__()
tpt_callback()
g1.switch()
g1 = greenlet.greenlet(g1_run)
g2 = greenlet.greenlet(g2_run)
x = g1.switch()
self.assertEqual(x, 42)
tpt_callback() # ensure not in the trace
self.assertEqual(tracer.actions, [
('return', '__enter__'),
('call', 'tpt_callback'),
('return', 'tpt_callback'),
('c_call', 'g1_run'),
('call', 'g2_run'),
('call', 'tpt_callback'),
('return', 'tpt_callback'),
('call', '__exit__'),
('c_call', '__exit__'),
])
@unittest.skipIf(*DEBUG_BUILD_PY312)
def test_trace_events_multiple_greenlets_switching_siblings(self):
# Like the first version, but get both greenlets running first
# as "siblings" and then establish the tracing.
tracer = PythonTracer()
g1 = None
g2 = None
def g1_run():
greenlet.getcurrent().parent.switch()
tracer.__enter__()
tpt_callback()
g2.switch()
tpt_callback()
return 42
def g2_run():
greenlet.getcurrent().parent.switch()
tpt_callback()
tracer.__exit__()
tpt_callback()
g1.switch()
g1 = greenlet.greenlet(g1_run)
g2 = greenlet.greenlet(g2_run)
# Start g1
g1.switch()
# And it immediately returns control to us.
# Start g2
g2.switch()
# Which also returns. Now kick of the real part of the
# test.
x = g1.switch()
self.assertEqual(x, 42)
tpt_callback() # ensure not in the trace
self.assertEqual(tracer.actions, [
('return', '__enter__'),
('call', 'tpt_callback'),
('return', 'tpt_callback'),
('c_call', 'g1_run'),
('call', 'tpt_callback'),
('return', 'tpt_callback'),
('call', '__exit__'),
('c_call', '__exit__'),
])
if __name__ == '__main__':
unittest.main()