def _sort_by_age()

in curator/snapshotlist.py [0:0]

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

    def _sort_by_age(self, snapshot_list, reverse=True):
        """
        Take a list of snapshots and sort them by date.

        By default, the youngest are first with ``reverse=True``, but the oldest
        can be first by setting ``reverse=False``
        """
        # Do the age-based sorting here.
        # First, build an temporary dictionary with just snapshot and age
        # as the key and value, respectively
        temp = {}
        for snap in snapshot_list:
            if self.age_keyfield in self.snapshot_info[snap]:
                # This fixes #1366. Catch None is a potential age value.
                if self.snapshot_info[snap][self.age_keyfield]:
                    temp[snap] = self.snapshot_info[snap][self.age_keyfield]
                else:
                    msg = f' snapshot {snap} has no age'
                    self.__excludify(True, True, snap, msg)
            else:
                msg = (
                    f'{snap} does not have age key "{self.age_keyfield}" '
                    f'in SnapshotList metadata'
                )
                self.__excludify(True, True, snap, msg)

        # If reverse is True, this will sort so the youngest snapshots are
        # first.  However, if you want oldest first, set reverse to False.
        # Effectively, this should set us up to act on everything older than
        # meets the other set criteria.
        # It starts as a tuple, but then becomes a list.
        sorted_tuple = sorted(temp.items(), key=lambda k: k[1], reverse=reverse)
        return [x[0] for x in sorted_tuple]