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_GET_ROOT_ENVIRON = {}
def get_root(router):
""" Given a :mod:`repoze.bfg` Router application instance as its
``router`` argument, this callable returns the traversal root of
graph as defined by the application's root factory. It also has
the effect of pushing a new registry and request on to the
internal thread local stack managed by BFG so that registry
lookups work properly.
.. warning:: This function should never be called from *within* a
BFG model or view, only from top-level scripts which wish to
get the root of a graph to do offline processing."""
registry = router.registry
threadlocals = {'registry':registry, 'request':None}
router.threadlocal_manager.push(threadlocals)
return router.root_factory(_GET_ROOT_ENVIRON)
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