def _ttl_action()

in src/dynamodb_encryption_sdk/material_providers/most_recent.py [0:0]

• 18 lines of code
• 8 McCabe index (conditional complexity)

    def _ttl_action(self, version, action):
        # type: (str) -> TtlActions
        """Determine the correct action to take based on the local resources and TTL.

        :param action: The action being taken (encrypt or decrypt)

        :returns: decision
        :rtype: TtlActions
        """
        try:
            if action == _ENCRYPT_ACTION:
                # On encrypt, always check the class-level variable indicating when we last checked for updates.
                # The cache timestamps will be updated by calls to decrypt, so we don't want frequent decrypts to
                # prevent us from re-checking for a newer encryption version
                if self._last_updated is None:
                    return TtlActions.EXPIRED
                timestamp = self._last_updated
            else:
                timestamp, _ = self._cache.get(version)
            time_since_updated = time.time() - timestamp

            if time_since_updated < self._version_ttl:
                return TtlActions.LIVE

            if time_since_updated < self._version_ttl + self._grace_period:
                return TtlActions.GRACE_PERIOD

            _LOGGER.debug("TTL Expired because known version has expired")
            return TtlActions.EXPIRED
        except KeyError:
            _LOGGER.debug("TTL Expired because the requested version doesn't exist in the cache")
            return TtlActions.EXPIRED