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61 lines
2.0 KiB
Python
61 lines
2.0 KiB
Python
"""CodSpeed benchmarks for importing entity components.
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Every ``esphome config`` or ``esphome compile`` imports the Python module of
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each component the YAML uses. A component that imports its optional
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integrations (mqtt, web_server, zigbee) at module scope drags their whole
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import chains in for every user, so the cost of a fresh import is what these
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benchmarks pin down.
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The core of esphome is imported once up front and stays loaded; each run
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drops only the component modules from ``sys.modules`` and imports the
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component again, so the import machinery and the module bodies of the
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component and everything it pulls in run every time, as they do in a new
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process, while a change to the core moves no number here.
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Skipped when ``pytest-codspeed`` isn't installed so the regular unit-test
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suite keeps working unchanged.
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"""
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from __future__ import annotations
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from collections.abc import Generator
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import importlib
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import sys
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import pytest
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pytest.importorskip("pytest_codspeed")
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# Load the core before the first case so no case pays for it.
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import esphome.codegen # noqa: E402, F401
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import esphome.config_validation # noqa: E402, F401
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COMPONENTS = ("binary_sensor", "sensor", "logger")
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COMPONENT_PREFIX = "esphome.components."
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@pytest.fixture
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def restore_modules() -> Generator[None]:
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"""Put the module objects that were loaded before the case back afterwards.
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The case replaces every component module with a fresh copy; anything
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that imported the originals keeps using them, so they must be the ones
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left in ``sys.modules`` for later tests.
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"""
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saved = dict(sys.modules)
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yield
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sys.modules.clear()
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sys.modules.update(saved)
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def _import_component(name: str) -> object:
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for module in [m for m in sys.modules if m.startswith(COMPONENT_PREFIX)]:
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del sys.modules[module]
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return importlib.import_module(COMPONENT_PREFIX + name)
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@pytest.mark.usefixtures("restore_modules")
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@pytest.mark.parametrize("component", COMPONENTS)
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def test_import_component(benchmark, component: str) -> None:
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benchmark(_import_component, component)
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