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76 lines
1.9 KiB
Python
76 lines
1.9 KiB
Python
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"""A place for common utilities between wubloader components"""
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import datetime
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import dateutil.parser
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import yaml
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class Config(object):
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def load(self,
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run_start_time,
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):
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# PyYAML tries to...ugh...be clever, and parse timestamps if it can work out how.
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# So we should only try to parse if it's not datetime already.
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if not isinstance(run_start_time, datetime.datetime):
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run_start_time = dateutil.parser.parse(run_start_time)
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self.run_start_time = run_start_time
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CONF = Config()
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def load_config(path="/etc/wubloader.yaml"):
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with open(path) as f:
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CONF.load(**yaml.safe_load(f))
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def dt_to_bustime(dt):
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"""Convert a datetime to bus time. Bus time is seconds since the start of the run
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as defined in the config file."""
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return (dt - CONF.run_start_time).total_seconds()
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def bustime_to_dt(bustime):
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"""Convert from bus time to a datetime"""
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return CONF.run_start_time + datetime.timedelta(seconds=bustime)
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def format_bustime(bustime, round="millisecond"):
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"""Convert bustime to a human-readable string (-)HH:MM:SS.fff, with the
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ending cut off depending on the value of round:
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"millisecond": (default) Round to the nearest millisecond.
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"second": Round down to the current second.
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"minute": Round down to the current minute.
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Examples:
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00:00:00.000
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01:23:00
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110:50
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159:59:59.999
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-10:30:01.100
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Negative times are formatted as time-until-start, preceeded by a minus
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sign.
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eg. "-1:20:00" indicates the run begins in 80 minutes.
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"""
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sign = ''
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if bustime < 0:
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sign = '-'
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bustime = -bustime
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total_mins, secs = divmod(bustime, 60)
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hours, mins = divmod(total_mins, 60)
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parts = [
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"{:02d}".format(int(hours)),
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"{:02d}".format(int(mins)),
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]
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if round == "minute":
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pass
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elif round == "second":
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parts.append("{:02d}".format(int(secs)))
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elif round == "millisecond":
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parts.append("{:06.3f}".format(secs))
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else:
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raise ValueError("Bad rounding value: {!r}".format(round))
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return sign + ":".join(parts)
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