46 lines
1.5 KiB
Python
46 lines
1.5 KiB
Python
import inspect
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import typing
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import fastapi
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def load(parameters_definition: dict[str, dict]) -> list[inspect.Parameter]:
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"""
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Load a list python function parameters from their definitions.
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:param parameters_definition: the definitions of the parameters
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:return: the python function parameters
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Examples:
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>>> parameters_definition = {
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... "boolean": {"type": "bool", "default": False},
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... "list": {"type": "list", "default": [1, 2, 3]},
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... "file": {"type": "file"},
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... }
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>>> parameters = load_parameters(parameters_definition)
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"""
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parameters: list[inspect.Parameter] = []
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for name, definition in parameters_definition.items():
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# preprocess the type
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match definition["type"]:
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case "file":
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# shortcut for uploading a file
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definition["type"] = typing.Annotated[
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fastapi.UploadFile,
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fastapi.File()
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]
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# deserialize the parameter
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parameter = inspect.Parameter(
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name,
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inspect.Parameter.POSITIONAL_OR_KEYWORD,
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default=definition.get("default", inspect.Parameter.empty),
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annotation=definition["type"],
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)
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parameters.append(parameter)
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# sort the parameters so that non-default arguments always end up before default ones
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parameters.sort(key=lambda parameter: parameter.default is inspect.Parameter.empty, reverse=True)
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return parameters
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