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86 lines
2.4 KiB
Python
86 lines
2.4 KiB
Python
# Python port of the ms.js node module this is not a direct port some things are
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# more complicated or less precise and we lean on time delta here.
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import re
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import datetime
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PATTERN=re.compile(
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'((?:\d+)?\.?\d+) *([a-z])'
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)
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def seconds(value):
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return datetime.timedelta(seconds=int(value))
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def minutes(value):
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return datetime.timedelta(minutes=int(value))
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def hours(value):
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return datetime.timedelta(hours=int(value))
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def days (value):
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return datetime.timedelta(days=int(value))
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def years(value):
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# Warning here "years" are vague don't use this for really sensitive date
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# computation the idea is to give you a absolute amount of time in the
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# future which is not the same thing as "precisely on this date next year"
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return datetime.timedelta(days=int(value) * 365)
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ALIASES = {}
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ALIASES['seconds'] = ALIASES['second'] = ALIASES['s'] = seconds
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ALIASES['minutes'] = ALIASES['minute'] = ALIASES['m'] = minutes
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ALIASES['hours'] = ALIASES['hour'] = ALIASES['h'] = hours
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ALIASES['days'] = ALIASES['day'] = ALIASES['d'] = days
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ALIASES['years'] = ALIASES['year'] = ALIASES['y'] = years
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class InvalidString(Exception):
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pass
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class UnknownTimeMeasurement(Exception):
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pass
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def value_of(input_str):
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'''
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Convert a string to a json date in the future
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:param str input_str: (ex: 1d, 2d, 6years, 2 seconds)
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:returns: Unit given in seconds
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'''
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matches = PATTERN.search(input_str)
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if matches is None or len(matches.groups()) < 2:
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raise InvalidString("'{}' is invalid string".format(input_str))
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value, unit = matches.groups()
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if unit not in ALIASES:
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raise UnknownTimeMeasurement(
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'{} is not a valid time measure use one of {}'.format(unit,
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sorted(ALIASES.keys()))
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)
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return ALIASES[unit](value)
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def json_time_from_now(input_str, now=None):
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'''
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:param str input_str: Input string (see value of)
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:param datetime now: Optionally set the definition of `now`
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:returns: JSON string representation of time in future.
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'''
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if now is None:
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now = datetime.datetime.utcnow()
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time = now + value_of(input_str)
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# Sorta a big hack but the json schema validator for date does not like the
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# ISO dates until 'Z' (for timezone) is added...
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return time.isoformat() + 'Z'
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def current_json_time():
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'''
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:returns: JSON string representation of the current time.
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'''
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return datetime.datetime.utcnow().isoformat() + 'Z'
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