57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
"""Middleware to hydrate the state."""
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from __future__ import annotations
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from typing import TYPE_CHECKING, Optional
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from pynecone import constants
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from pynecone.event import Event, EventHandler, get_hydrate_event
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from pynecone.middleware.middleware import Middleware
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from pynecone.state import Delta, State
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from pynecone.utils import format
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if TYPE_CHECKING:
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from pynecone.app import App
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class HydrateMiddleware(Middleware):
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"""Middleware to handle initial app hydration."""
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def preprocess(self, app: App, state: State, event: Event) -> Optional[Delta]:
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"""Preprocess the event.
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Args:
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app: The app to apply the middleware to.
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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 to return.
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"""
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if event.name == get_hydrate_event(state):
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route = event.router_data.get(constants.RouteVar.PATH, "")
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if route == "/":
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load_event = app.load_events.get(constants.INDEX_ROUTE)
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elif route:
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load_event = app.load_events.get(route.lstrip("/"))
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else:
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load_event = None
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if load_event:
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if isinstance(load_event, list):
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for single_event in load_event:
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self.execute_load_event(state, single_event)
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else:
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self.execute_load_event(state, load_event)
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return format.format_state({state.get_name(): state.dict()})
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def execute_load_event(self, state: State, load_event: EventHandler) -> None:
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"""Execute single load event.
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Args:
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state: The client state.
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load_event: A single load event to execute.
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"""
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substate_path = format.format_event_handler(load_event).split(".")
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ex_state = state.get_substate(substate_path[:-1])
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load_event.fn(ex_state)
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