49 lines
1.1 KiB
Python
49 lines
1.1 KiB
Python
"""Base Reflex middleware."""
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from __future__ import annotations
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from abc import ABC, abstractmethod
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from typing import TYPE_CHECKING
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from reflex_base.event import Event
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from reflex.state import BaseState, StateUpdate
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if TYPE_CHECKING:
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from reflex.app import App
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class Middleware(ABC):
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"""Middleware to preprocess and postprocess requests."""
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@abstractmethod
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async def preprocess(
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self, app: App, state: BaseState, event: Event
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) -> StateUpdate | None:
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"""Preprocess the event.
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Args:
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app: The app.
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state: The client state.
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event: The event to preprocess.
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Returns:
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An optional state update to return.
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"""
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return None
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async def postprocess(
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self, app: App, state: BaseState, event: Event, update: StateUpdate
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) -> StateUpdate:
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"""Postprocess the event.
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Args:
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app: The app.
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state: The client state.
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event: The event to postprocess.
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update: The current state update.
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Returns:
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An optional state to return.
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"""
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return update
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