48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
"""The Inventory singleton"""
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# TODO make this dynamic, and watch out for frozen, like with messagetypes
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import storage.filesystem
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import storage.sqlite
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from bmconfigparser import config
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from singleton import Singleton
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def create_inventory_instance(backend="sqlite"):
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"""
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Create an instance of the inventory class
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defined in `storage.<backend>`.
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"""
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return getattr(
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getattr(storage, backend),
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"{}Inventory".format(backend.title()))()
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@Singleton
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class Inventory():
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"""
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Inventory singleton class which uses storage backends
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to manage the inventory.
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"""
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def __init__(self):
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self._moduleName = config.safeGet("inventory", "storage")
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self._realInventory = create_inventory_instance(self._moduleName)
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self.numberOfInventoryLookupsPerformed = 0
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# cheap inheritance copied from asyncore
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def __getattr__(self, attr):
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if attr == "__contains__":
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self.numberOfInventoryLookupsPerformed += 1
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try:
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realRet = getattr(self._realInventory, attr)
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except AttributeError:
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raise AttributeError(
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"%s instance has no attribute '%s'" %
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(self.__class__.__name__, attr)
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)
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else:
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return realRet
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# hint for pylint: this is dictionary like object
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def __getitem__(self, key):
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return self._realInventory[key]
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