67 lines
2.1 KiB
Python
67 lines
2.1 KiB
Python
import functools
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from importlib import import_module
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from django.core.exceptions import ViewDoesNotExist
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from django.utils.module_loading import module_has_submodule
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@functools.lru_cache(maxsize=None)
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def get_callable(lookup_view):
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"""
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Return a callable corresponding to lookup_view.
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* If lookup_view is already a callable, return it.
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* If lookup_view is a string import path that can be resolved to a callable,
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import that callable and return it, otherwise raise an exception
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(ImportError or ViewDoesNotExist).
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"""
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if callable(lookup_view):
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return lookup_view
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if not isinstance(lookup_view, str):
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raise ViewDoesNotExist(
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"'%s' is not a callable or a dot-notation path" % lookup_view
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)
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mod_name, func_name = get_mod_func(lookup_view)
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if not func_name: # No '.' in lookup_view
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raise ImportError(
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"Could not import '%s'. The path must be fully qualified." % lookup_view
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)
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try:
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mod = import_module(mod_name)
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except ImportError:
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parentmod, submod = get_mod_func(mod_name)
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if submod and not module_has_submodule(import_module(parentmod), submod):
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raise ViewDoesNotExist(
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"Could not import '%s'. Parent module %s does not exist."
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% (lookup_view, mod_name)
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)
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else:
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raise
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else:
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try:
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view_func = getattr(mod, func_name)
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except AttributeError:
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raise ViewDoesNotExist(
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"Could not import '%s'. View does not exist in module %s."
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% (lookup_view, mod_name)
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)
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else:
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if not callable(view_func):
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raise ViewDoesNotExist(
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"Could not import '%s.%s'. View is not callable."
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% (mod_name, func_name)
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)
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return view_func
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def get_mod_func(callback):
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# Convert 'django.views.news.stories.story_detail' to
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# ['django.views.news.stories', 'story_detail']
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try:
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dot = callback.rindex(".")
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except ValueError:
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return callback, ""
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return callback[:dot], callback[dot + 1 :]
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