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"""Base classes for mapping.""" |
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import abc |
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import functools |
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from .. import common |
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from ..mapper import MAPPER, get_mapper |
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log = common.logger(__name__) |
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def fetch_before(method): |
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"""Decorator for methods that should fetch before call.""" |
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@functools.wraps(method) |
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def fetch_before(self, *args, **kwargs): # pylint: disable=W0621 |
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"""Decorated method.""" |
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mapper = get_mapper(self) |
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if mapper and mapper.modified: |
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log.debug("fetch before call: %s", method.__name__) |
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mapper.fetch() |
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if mapper.auto_store: |
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mapper.store() |
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mapper.modified = False |
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return method(self, *args, **kwargs) |
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return fetch_before |
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def store_after(method): |
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"""Decorator for methods that should store after call.""" |
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@functools.wraps(method) |
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def store_after(self, *args, **kwargs): # pylint: disable=W0621 |
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"""Decorated method.""" |
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result = method(self, *args, **kwargs) |
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mapper = get_mapper(self) |
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if mapper and mapper.auto: |
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log.debug("store after call: %s", method.__name__) |
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mapper.store() |
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return result |
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return store_after |
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class Mappable(metaclass=abc.ABCMeta): # pylint: disable=R0201 |
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"""Base class for objects with attributes mapped to file.""" |
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# pylint: disable=no-member |
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def __getattribute__(self, name): |
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"""Trigger object update when reading attributes.""" |
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# TODO: remove MAPPER once renamed to '__mapper__' |
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if name.startswith('__') or name == MAPPER: |
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# avoid infinite recursion (attribute requested in this function) |
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return object.__getattribute__(self, name) |
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mapper = get_mapper(self) |
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# Get the attribute's current value |
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try: |
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value = object.__getattribute__(self, name) |
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except AttributeError as exc: |
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missing = True |
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if not mapper: |
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raise exc from None |
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else: |
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missing = False |
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# Fetch a new value from disk if the attribute is mapped or missing |
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if mapper and (missing or (name in mapper.attrs and mapper.modified)): |
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mapper.fetch() |
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value = object.__getattribute__(self, name) |
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# Store back to disk if this has been done before |
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if mapper.auto_store: |
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mapper.store() |
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mapper.modified = False |
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return value |
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def __setattr__(self, name, value): |
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"""Trigger file update when setting attributes.""" |
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super().__setattr__(name, value) |
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if name.startswith('__'): |
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return |
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mapper = get_mapper(self) |
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if mapper and mapper.auto and name in mapper.attrs: |
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mapper.store() |
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@fetch_before |
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def __iter__(self): |
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"""Trigger object update when iterating.""" |
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return super().__iter__() |
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@fetch_before |
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def __getitem__(self, key): |
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"""Trigger object update when reading an index.""" |
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return super().__getitem__(key) |
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@store_after |
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def __setitem__(self, key, value): |
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"""Trigger file update when setting an index.""" |
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super().__setitem__(key, value) |
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@store_after |
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def __delitem__(self, key): |
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"""Trigger file update when deleting an index.""" |
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super().__delitem__(key) |
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@store_after |
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def append(self, value): |
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"""Trigger file update when appending items.""" |
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super().append(value) |
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jacebrowning /
yorm
