dsignr · June 3, 2018 07:52 · Jun 3, 2018
diff --git a/example.py b/example.py
@@ -0,0 +1,57 @@
+# -*- coding: utf-8 -*-
+"""
+    flask.globals
+    ~~~~~~~~~~~~~
+    Defines all the global objects that are proxies to the current
+    active context.
+    :copyright: © 2010 by the Pallets team.
+    :license: BSD, see LICENSE for more details.
+"""
+
+from functools import partial
+from werkzeug.local import LocalStack, LocalProxy
+
+
+_request_ctx_err_msg = '''\
+Working outside of request context.
+This typically means that you attempted to use functionality that needed
+an active HTTP request.  Consult the documentation on testing for
+information about how to avoid this problem.\
+'''
+_app_ctx_err_msg = '''\
+Working outside of application context.
+This typically means that you attempted to use functionality that needed
+to interface with the current application object in some way. To solve
+this, set up an application context with app.app_context().  See the
+documentation for more information.\
+'''
+
+
+def _lookup_req_object(name):
+    top = _request_ctx_stack.top
+    if top is None:
+        raise RuntimeError(_request_ctx_err_msg)
+    return getattr(top, name)
+
+
+def _lookup_app_object(name):
+    top = _app_ctx_stack.top
+    if top is None:
+        raise RuntimeError(_app_ctx_err_msg)
+    return getattr(top, name)
+
+
+def _find_app():
+    top = _app_ctx_stack.top
+    if top is None:
+        raise RuntimeError(_app_ctx_err_msg)
+    return top.app
+
+
+# context locals
+_request_ctx_stack = LocalStack()
+_app_ctx_stack = LocalStack()
+current_app = LocalProxy(_find_app)
+request = LocalProxy(partial(_lookup_req_object, 'request'))
+session = LocalProxy(partial(_lookup_req_object, 'session'))
+g = LocalProxy(partial(_lookup_app_object, 'g'))