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The `VariableLoader` interface is used to load referenced variables when running a single node.
39 lines
1.7 KiB
Python
39 lines
1.7 KiB
Python
import abc
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from typing import Protocol
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from core.variables import Variable
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class VariableLoader(Protocol):
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"""Interface for loading variables based on selectors.
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A `VariableLoader` is responsible for retrieving additional variables required during the execution
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of a single node, which are not provided as user inputs.
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NOTE(QuantumGhost): Typically, all variables loaded by a `VariableLoader` should belong to the same
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application and share the same `app_id`. However, this interface does not enforce that constraint,
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and the `app_id` parameter is intentionally omitted from `load_variables` to achieve separation of
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concern and allow for flexible implementations.
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Implementations of `VariableLoader` should almost always have an `app_id` parameter in
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their constructor.
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TODO(QuantumGhost): this is a temporally workaround. If we can move the creation of node instance into
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`WorkflowService.single_step_run`, we may get rid of this interface.
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"""
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@abc.abstractmethod
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def load_variables(self, selectors: list[list[str]]) -> list[Variable]:
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"""Load variables based on the provided selectors. If the selectors are empty,
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this method should return an empty list.
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The order of the returned variables is not guaranteed. If the caller wants to ensure
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a specific order, they should sort the returned list themselves.
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:param: selectors: a list of string list, each inner list should have at least two elements:
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- the first element is the node ID,
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- the second element is the variable name.
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:return: a list of Variable objects that match the provided selectors.
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"""
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pass
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