zhangyiss/the-littlest-jupyterhub
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Merge pull request #32 from rprimet/handle_transient

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Handle transient errors
This commit is contained in:
Yuvi Panda
2018-07-13 09:37:04 -07:00
committed by GitHub
parent aa3630527b 61a7f80df2
commit 755a26ebfa
1 changed files with 9 additions and 1 deletions
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10
tljh/installer.py
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@@ -2,6 +2,7 @@ import sys
import os import os
import tljh.systemd as systemd import tljh.systemd as systemd
import tljh.conda as conda import tljh.conda as conda
from urllib.error import HTTPError
from urllib.request import urlopen, URLError from urllib.request import urlopen, URLError
from tljh import user from tljh import user
import secrets import secrets
@@ -139,11 +140,18 @@ def ensure_jupyterhub_running(times=4):
Loops given number of times, waiting a second each. Loops given number of times, waiting a second each.
""" """
for i in range(4): for i in range(times):
try: try:
print('Waiting for JupyterHub to come up ({}/{} tries)'.format(i + 1, times)) print('Waiting for JupyterHub to come up ({}/{} tries)'.format(i + 1, times))
urlopen('http://127.0.0.1') urlopen('http://127.0.0.1')
return return
except HTTPError as h:
if h.code in [404, 503]:
# May be transient
time.sleep(1)
continue
# Everything else should immediately abort
raise
except URLError as e: except URLError as e:
if isinstance(e.reason, ConnectionRefusedError): if isinstance(e.reason, ConnectionRefusedError):
# Hub isn't up yet, sleep & loop # Hub isn't up yet, sleep & loop