119 lines
3.4 KiB
Python
Executable file
119 lines
3.4 KiB
Python
Executable file
#!/usr/bin/env python3
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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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#
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# Requires: pytz. tzlocal
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# Usage: time-in Copenhagen "Toronto, ON" Vancouver
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import sys
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import os
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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 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 get_timezone(lat, lng, timestamp):
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try:
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url = _generate_url(URL_TZ, lat, lng, timestamp)
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resp = request.urlopen(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['timeZoneId']
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elif result['status'] != 'UNKNOWN_ERROR':
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raise Exception(result['error_message'])
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except IOError:
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print("IOError")
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def get_coords(desc):
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try:
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url = _generate_url(URL_GEOCODE, desc)
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resp = request.urlopen(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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if result['results']:
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return {
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"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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}
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else:
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return None
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elif result['status'] != 'UNKNOWN_ERROR':
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raise Exception(result['error_message'])
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except IOError:
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print("IOError")
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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': fn()
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}
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return value
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def diff(a, b):
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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)
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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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if __name__ == '__main__':
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if not sys.argv[1:]:
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print("Usage: {} [LOCATION]".format(sys.argv[0]))
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sys.exit(1)
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if os.path.isfile(CACHE_FILE):
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with open(CACHE_FILE, 'r') as f:
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CACHE = json.load(f)
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here = get_localzone().localize(datetime.now())
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for location in sys.argv[1:]:
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d_coords = cache("coords-" + encode(location), lambda: get_coords(location), 86400)
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if d_coords:
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d_tzname = cache(
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"tz-" + encode(location),
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lambda: get_timezone(d_coords['lat'], d_coords['lng'], here.timestamp()),
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1800
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)
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then = here.astimezone(timezone(d_tzname))
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diff = diff(here, then)
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print("{:30}{} ({} {})".format(
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d_coords['name'],
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then.isoformat(),
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diff,
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"ago" if then < here else "ahead"
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))
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else:
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print("Couldn't find {}".format(location))
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with open(CACHE_FILE, 'w') as f:
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json.dump(CACHE, f)
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sys.exit(0)
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