120 lines
3.6 KiB
Python
Executable file
120 lines
3.6 KiB
Python
Executable file
#!/usr/bin/env python3
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"""
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Retrieves the time (and time difference) at a location (can be an address,
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postal code, country name, etc). Uses Google Maps APIs to map locations to
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coordinates, and coordinates to timezones.
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Requires: pytz, tzlocal
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Usage: time-in Copenhagen "Toronto, ON" Vancouver
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"""
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import sys
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import json
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from base64 import b64encode
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from datetime import datetime
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from urllib import request
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from pathlib import Path
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from pytz import timezone
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from tzlocal import get_localzone
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URL_BASE = "https://maps.googleapis.com/maps/api/"
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URL_TZ = URL_BASE + "timezone/json?location={},{}×tamp={}"
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URL_GEOCODE = URL_BASE + "geocode/json?address={}"
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CACHE_FILE = "/tmp/time-in"
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CACHE = {}
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#
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def _generate_url(url, *args):
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return url.format(*map(request.quote, map(str, args)))
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def _request(url, *args):
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real_url = url.format(*map(request.quote, map(str, args)))
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resp = request.urlopen(real_url).read()
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result = json.loads(resp.decode('utf-8'))
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if result['status'] == 'OK':
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return result
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elif result['status'] != 'UNKNOWN_ERROR':
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raise Exception(result['error_message'])
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def get_timezone(coords, timestamp):
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return _request(URL_TZ, coords['lat'], coords['lng'], timestamp)['timeZoneId']
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def get_coords(desc):
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result = _request(URL_GEOCODE, desc)
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if 'results' in result:
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return {"lat": result['results'][0]['geometry']['location']['lat'],
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"lng": result['results'][0]['geometry']['location']['lng'],
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"name": result['results'][0]['formatted_address']}
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def cache(key, fn, ttl):
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if key in CACHE and CACHE[key]['time'] < CACHE[key]['time'] + ttl:
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return CACHE[key]['value']
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value = fn()
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if value is not None:
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CACHE[key] = {
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'time': datetime.now().timestamp(),
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'value': value
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}
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return value
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def diff(a, b, absolute=False):
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"""Returns a timedelta object"""
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a = a.replace(tzinfo=None)
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b = b.replace(tzinfo=None)
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return (max(a, b) - min(a, b), b > a)
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def encode(s):
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return str(b64encode(s.encode('ascii')))
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#
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def each_location(locations):
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"""
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Enumerates over and maps a list of location strings to time difference data.
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"""
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here = get_localzone().localize(datetime.now())
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for location in locations:
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coords = cache("coords-" + encode(location),
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lambda l=location: get_coords(l),
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86400)
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if coords:
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tzname = cache("tz-" + encode(location),
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lambda c=coords: get_timezone(c, here.timestamp()),
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1800)
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then = here.astimezone(timezone(tzname))
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tdiff, direction = diff(here, then)
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if tdiff.seconds == 0:
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suffix = "(same timezone)"
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elif direction:
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suffix = "ahead"
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else:
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suffix = "behind"
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yield {
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"name": coords['name'],
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"then": then.strftime("%b %d, %H:%M:%S %Z%z"),
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"diff": int(tdiff.seconds / 60 / 60),
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"suffix": suffix,
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}
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else:
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yield None
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if __name__ == '__main__':
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assert sys.argv[1:], "Usage: {} [LOCATION]".format(sys.argv[0])
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cachefp = Path(CACHE_FILE)
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CACHE = json.loads(cachefp.read_text()) if cachefp.exists() else {}
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for data in each_location(sys.argv[1:]):
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if data:
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print("{name:24} {then}\t{diff}h {suffix}".format(**data))
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else:
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print("Couldn't find {name} or something went wrong".format(**data), file=sys.stderr)
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cachefp.write_text(json.dumps(CACHE))
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