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0781237b1f
FuncT was unused in decorator.py, and only imported into profile.py. The @profiled decorator is now more strongly typed on return-type. Annotations were converted to python3 format.
34 lines
1.1 KiB
Python
34 lines
1.1 KiB
Python
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import cProfile
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from functools import wraps
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from typing import Any, TypeVar, Callable
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ReturnT = TypeVar('ReturnT')
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def profiled(func: Callable[..., ReturnT]) -> Callable[..., ReturnT]:
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"""
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This decorator should obviously be used only in a dev environment.
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It works best when surrounding a function that you expect to be
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called once. One strategy is to write a backend test and wrap the
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test case with the profiled decorator.
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You can run a single test case like this:
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# edit zerver/tests/test_external.py and place @profiled above the test case below
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./tools/test-backend zerver.tests.test_external.RateLimitTests.test_ratelimit_decrease
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Then view the results like this:
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./tools/show-profile-results test_ratelimit_decrease.profile
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"""
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@wraps(func)
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def wrapped_func(*args: Any, **kwargs: Any) -> ReturnT:
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fn = func.__name__ + ".profile"
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prof = cProfile.Profile()
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retval = prof.runcall(func, *args, **kwargs) # type: ReturnT
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prof.dump_stats(fn)
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return retval
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return wrapped_func
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