Method __load_cache

apprise/persistent_store.py:930–1013

Loads our cache. _recovery is reserved for internal usage and should not be changed

(self, _recovery=False)

        return change

    def __load_cache(self, _recovery=False):
        """Loads our cache.

        _recovery is reserved for internal usage and should not be changed
        """

        # Prepare our dirty flag
        self.__dirty = False

        if self.__mode == PersistentStoreMode.MEMORY:
            # Nothing further to do
            self._cache = {}
            return True

        # Prepare our cache file
        cache_file = self.cache_file
        try:
            with gzip.open(cache_file, "rb") as f:
                # Read our ontent from disk
                self._cache = {}
                for k, v in json.loads(f.read().decode(self.encoding)).items():
                    co = CacheObject.instantiate(v)
                    if co:
                        # Verify our object before assigning it
                        self._cache[k] = co

                    elif not self.__dirty:
                        # Track changes from our loadset
                        self.__dirty = True

        except (
            UnicodeDecodeError,
            json.decoder.JSONDecodeError,
            zlib.error,
            TypeError,
            AttributeError,
            EOFError,
        ):
            # Let users known there was a problem
            logger.warning(
                "Corrupted access persistent cache content: %s", cache_file
            )

            if not _recovery:
                try:
                    os.unlink(cache_file)
                    logger.trace(
                        "Removed previous persistent cache content: %s",
                        cache_file,
                    )

                except FileNotFoundError:
                    # no worries; we were removing it anyway
                    pass

                except OSError as e:
                    # Permission error of some kind or disk problem...
                    # There is nothing we can do at this point