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import pytest
from parsl.app.app import python_app
from parsl.dataflow.errors import DependencyError
class ManufacturedTestFailure(Exception):
pass
@python_app
def random_fail(fail_prob: float, inputs=()):
import random
if random.random() < fail_prob:
raise ManufacturedTestFailure("App failure")
def test_no_deps():
"""Test basic error handling, with no dependent failures
"""
futs = [random_fail(1), random_fail(0), random_fail(0)]
for f in futs:
try:
f.result()
except ManufacturedTestFailure:
pass
def test_fail_sequence_first():
t1 = random_fail(fail_prob=1)
t2 = random_fail(fail_prob=0, inputs=[t1])
t_final = random_fail(fail_prob=0, inputs=[t2])
with pytest.raises(DependencyError):
t_final.result()
assert len(t_final.exception().dependent_exceptions_tids) == 1
assert isinstance(t_final.exception().dependent_exceptions_tids[0][0], DependencyError)
assert t_final.exception().dependent_exceptions_tids[0][1].startswith("task ")
assert hasattr(t_final.exception(), '__cause__')
assert t_final.exception().__cause__ == t1.exception()
def test_fail_sequence_middle():
t1 = random_fail(fail_prob=0)
t2 = random_fail(fail_prob=1, inputs=[t1])
t_final = random_fail(fail_prob=0, inputs=[t2])
with pytest.raises(DependencyError):
t_final.result()
assert len(t_final.exception().dependent_exceptions_tids) == 1
assert isinstance(t_final.exception().dependent_exceptions_tids[0][0], ManufacturedTestFailure)
assert hasattr(t_final.exception(), '__cause__')
assert t_final.exception().__cause__ == t2.exception()
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