def invalidate(self):
"""Invalidates the cache (i.e. removes all cache files)."""
if self.readonly:
raise CacheIOError("Cannot invalidate a readonly cache.")
self._close_fd()
with self._index:
for path in self.get_files():
self.remove_file(path)
def _load_index_file(self):
with open(self.index_path, "rb") as f:
self.version = pickle.load(f)
if (self.version[0] > self.VERSION
or self.version[1] > pickle.HIGHEST_PROTOCOL):
raise CacheIOError("Unsupported cache index file format.")
self._index = pickle.load(f)
assert isinstance(self.version, tuple)
assert isinstance(self._index, dict)