laipeng/reflex
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Added descriptor for backend vars (#2618)

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* Added descriptor for backend vars

* Fixed darglint issue
This commit is contained in:
wassaf shahzad 2024-02-21 00:51:48 +01:00 committed by GitHub
parent 9d051d383e
commit f9d219407f
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1 changed files with 20 additions and 0 deletions
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reflex/state.py
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@ -380,6 +380,9 @@ class BaseState(Base, ABC, extra=pydantic.Extra.allow):
cls._init_var_dependency_dicts() cls._init_var_dependency_dicts()
for name in cls.new_backend_vars:
setattr(cls, name, PrivateVarDescriptor())
@staticmethod @staticmethod
def _copy_fn(fn: Callable) -> Callable: def _copy_fn(fn: Callable) -> Callable:
"""Copy a function. Used to copy ComputedVars and EventHandlers from mixins. """Copy a function. Used to copy ComputedVars and EventHandlers from mixins.
@ -2288,3 +2291,20 @@ def code_uses_state_contexts(javascript_code: str) -> bool:
True if the code attempts to access a member of StateContexts. True if the code attempts to access a member of StateContexts.
""" """
return bool("useContext(StateContexts" in javascript_code) return bool("useContext(StateContexts" in javascript_code)
class PrivateVarDescriptor:
"""A descriptor to raise error in case private vars is accessed on thr frontend."""
def __get__(self, *args, **kwargs):
"""Raise error on get value.
Args:
*args: The args to pass to the function.
**kwargs: The kwargs to pass to the function.
Raises:
TypeError: if a background variable is used in frontend.
"""
raise TypeError("Backend Vars cannot be accessed on the frontend.")