markusressel/container-app-conf

#  Copyright (c) 2019 Markus Ressel
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#  of this software and associated documentation files (the "Software"), to deal
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#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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from datetime import timedelta

from pytimeparse import parse

from container_app_conf import ConfigEntry


class TimeDeltaConfigEntry(ConfigEntry):
    _example = "4h32m1s"

    def _value_to_type(self, value: any) -> timedelta or None:
        """
        Tries to permissively convert the given value to a timedelta.
        :param value: the value to parse
        :return: the parsed date value
        """
        if isinstance(value, timedelta):
            return value
        elif isinstance(value, str):
            parsed = parse(value)
            if parsed is None:
                raise ValueError("Cannot parse the given timedelta format: {}".format(value))
            return timedelta(seconds=parsed)
        else:
            raise ValueError("Unsupported type: {}".format(type(value)))