User online status polling

.gitignore

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+/settings/keys.py
+/tracker.session
+__pycache__/

settings/__init__.py

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+try:
+    from .keys import API_ID, API_HASH
+except ImportError:
+    print('Put API_ID and API_HASH into settings/keys.py')
+    print()
+    raise IOError('Missing API_ID and API_HASH in settings/keys.py')

track/__main__.py

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+from datetime import datetime
+from settings import API_ID, API_HASH
+from sys import argv, exit
+from telethon import TelegramClient
+from telethon.tl.types import UserStatusOnline, UserStatusOffline
+from time import mktime, sleep
+
+
+DATETIME_FORMAT = '%Y-%m-%d @ %H:%M:%S'
+
+
+def utc2localtime(utc):
+    pivot = mktime(utc.timetuple())
+    offset = datetime.fromtimestamp(pivot) - datetime.utcfromtimestamp(pivot)
+    return utc + offset
+
+
+if len(argv) < 2:
+    print(f'usage: {argv[0]} <contact id>')
+    exit(1)
+contact_id = argv[1]
+
+client = TelegramClient('tracker', API_ID, API_HASH)
+client.start()
+
+online = None
+last_offline = None
+while True:
+    contact = client.get_entity(contact_id)
+    if isinstance(contact.status, UserStatusOffline):
+        if online != False:
+            online = False
+            print(f'User went offline: {utc2localtime(contact.status.was_online).strftime(DATETIME_FORMAT)}')
+        elif last_offline != contact.status.was_online:
+            print(f'User went online and back offline: {utc2localtime(contact.status.was_online).strftime(DATETIME_FORMAT)}')
+        last_offline = contact.status.was_online
+    else:
+        if online != True:
+            online = True
+            print(f'User went online: {datetime.now().strftime(DATETIME_FORMAT)}')
+    sleep(15)