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39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
import cProfile
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from collections.abc import Callable
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from functools import wraps
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from typing import TypeVar
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from typing_extensions import ParamSpec
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ParamT = ParamSpec("ParamT")
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ReturnT = TypeVar("ReturnT")
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def profiled(func: Callable[ParamT, ReturnT]) -> Callable[ParamT, 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: ParamT.args, **kwargs: ParamT.kwargs) -> 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)
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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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