-
Notifications
You must be signed in to change notification settings - Fork 0
/
workspace_utils.py
56 lines (40 loc) · 1.56 KB
/
workspace_utils.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
import signal
from contextlib import contextmanager
import requests
DELAY = INTERVAL = 4 * 60 # interval time in seconds
MIN_DELAY = MIN_INTERVAL = 2 * 60
KEEPALIVE_URL = "https://nebula.udacity.com/api/v1/remote/keep-alive"
TOKEN_URL = "http://metadata.google.internal/computeMetadata/v1/instance/attributes/keep_alive_token"
TOKEN_HEADERS = {"Metadata-Flavor":"Google"}
def _request_handler(headers):
def _handler(signum, frame):
requests.request("POST", KEEPALIVE_URL, headers=headers)
return _handler
@contextmanager
def active_session(delay=DELAY, interval=INTERVAL):
"""
Example:
from workspace_utils import active session
with active_session():
# do long-running work here
"""
token = requests.request("GET", TOKEN_URL, headers=TOKEN_HEADERS).text
headers = {'Authorization': "STAR " + token}
delay = max(delay, MIN_DELAY)
interval = max(interval, MIN_INTERVAL)
original_handler = signal.getsignal(signal.SIGALRM)
try:
signal.signal(signal.SIGALRM, _request_handler(headers))
signal.setitimer(signal.ITIMER_REAL, delay, interval)
yield
finally:
signal.signal(signal.SIGALRM, original_handler)
signal.setitimer(signal.ITIMER_REAL, 0)
def keep_awake(iterable, delay=DELAY, interval=INTERVAL):
"""
Example:
from workspace_utils import keep_awake
for i in keep_awake(range(5)):
# do iteration with lots of work here
"""
with active_session(delay, interval): yield from iterable