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Refresh eventlet resolver on resolv.conf change

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Eventlet holds on to stale resolv.conf. As a workaround,
monitor resolv.conf and explicitly reinitialize greendns
resolver.
This commit is contained in:
Jarrod Johnson 2021-12-06 12:22:42 -05:00
parent 1b21b9316c
commit dcca844e9b
1 changed files with 15 additions and 0 deletions
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15
confluent_server/confluent/sockapi.py
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@ -34,6 +34,7 @@ import traceback
import eventlet.green.select as select
import eventlet.green.socket as socket
import eventlet.green.ssl as ssl
import eventlet.support.greendns as greendns
import eventlet
import confluent.auth as auth
@ -495,8 +496,22 @@ class SockApi(object):
self.start_remoteapi()
else:
eventlet.spawn_n(self.watch_for_cert)
eventlet.spawn_n(self.watch_resolv)
self.unixdomainserver = eventlet.spawn(_unixdomainhandler)
def watch_resolv(self):
while True:
watcher = libc.inotify_init1(os.O_NONBLOCK)
if libc.inotify_add_watch(watcher, b'/etc/resolv.conf', 0xcda) <= -1:
break
select.select((watcher,), (), (), 86400)
try:
os.read(watcher, 1024)
except Exception:
pass
greendns.resolver = greendns.ResolverProxy(hosts_resolver=greendns.HostsResolver())
os.close(watcher)
def watch_for_cert(self):
watcher = libc.inotify_init1(os.O_NONBLOCK)
if libc.inotify_add_watch(watcher, b'/etc/confluent/', 0x100) > -1: