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60 lines
1.7 KiB
60 lines
1.7 KiB
3 years ago
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import typing as t
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from functools import partial
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from werkzeug.local import LocalProxy
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from werkzeug.local import LocalStack
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if t.TYPE_CHECKING:
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from .app import Flask
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from .ctx import _AppCtxGlobals
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from .sessions import SessionMixin
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from .wrappers import Request
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_request_ctx_err_msg = """\
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Working outside of request context.
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This typically means that you attempted to use functionality that needed
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an active HTTP request. Consult the documentation on testing for
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information about how to avoid this problem.\
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"""
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_app_ctx_err_msg = """\
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Working outside of application context.
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This typically means that you attempted to use functionality that needed
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to interface with the current application object in some way. To solve
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this, set up an application context with app.app_context(). See the
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documentation for more information.\
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"""
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def _lookup_req_object(name):
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top = _request_ctx_stack.top
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if top is None:
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raise RuntimeError(_request_ctx_err_msg)
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return getattr(top, name)
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def _lookup_app_object(name):
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top = _app_ctx_stack.top
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if top is None:
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raise RuntimeError(_app_ctx_err_msg)
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return getattr(top, name)
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def _find_app():
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top = _app_ctx_stack.top
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if top is None:
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raise RuntimeError(_app_ctx_err_msg)
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return top.app
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# context locals
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_request_ctx_stack = LocalStack()
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_app_ctx_stack = LocalStack()
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current_app: "Flask" = LocalProxy(_find_app) # type: ignore
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request: "Request" = LocalProxy(partial(_lookup_req_object, "request")) # type: ignore
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session: "SessionMixin" = LocalProxy( # type: ignore
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partial(_lookup_req_object, "session")
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)
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g: "_AppCtxGlobals" = LocalProxy(partial(_lookup_app_object, "g")) # type: ignore
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