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def get_root(app, environ=None):
""" Return a tuple composed of ``(root, closer)`` when provided a
``repoze.bfg.router.Router`` instance as the ``app`` argument.
The ``root`` returned is the application root object. The
``closer`` returned is a callable (accepting no arguments) that
should be called when your scripting application is finished using
the root. The closer also closes the db connection when its ``__del__``
method is called. This means the connection can also be closed by
explicitly deleting the closer using ``del`` or, more commonly, letting
it fall out of scope. If ``environ`` is not None, it is used as the
environment passed to the BFG application root factory. An empty environ
is constructed and passed to the root factory if ``environ`` is None."""
registry = app.registry
threadlocals = {'registry':registry, 'request':None}
app.threadlocal_manager.push(threadlocals)
if environ is None:
environ = {}
def closer(environ=environ): # keep environ alive via this function default
app.threadlocal_manager.pop()
root = app.root_factory(environ)
return root, closer
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