markusressel/container-app-conf

#  Copyright (c) 2019 Markus Ressel
#  .
#  Permission is hereby granted, free of charge, to any person obtaining a copy
#  of this software and associated documentation files (the "Software"), to deal
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#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
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#  The above copyright notice and this permission notice shall be included in all
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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,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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from datetime import datetime

import dateutil.parser

from container_app_conf import ConfigEntry


class DateConfigEntry(ConfigEntry):
    _example = "2008-09-03T20:56:35.450686Z"

    def _value_to_type(self, value: any) -> datetime or None:
        """
        Tries to permissively convert the given value to a datetime.
        :param value: the value to parse
        :return: the parsed date value
        """
        if isinstance(value, datetime):
            return value
        elif isinstance(value, str):
            return dateutil.parser.parse(value)
        else:
            raise ValueError("Unsupported type: {}".format(type(value)))

    def _type_to_value(self, type: any) -> any:
        if type is None:
            return None
        if isinstance(type, datetime):
            return type.isoformat()
        else:
            return str(type)