Add process hooks to tell systemd our state.

Fixes #5676.
This commit is contained in:
Erik Johnston 2019-07-22 14:19:38 +01:00
parent f337d2f0f0
commit c560b791e1
2 changed files with 30 additions and 0 deletions

View File

@ -15,10 +15,12 @@
import gc
import logging
import os
import signal
import sys
import traceback
import sdnotify
from daemonize import Daemonize
from twisted.internet import defer, error, reactor
@ -242,9 +244,16 @@ def start(hs, listeners=None):
if hasattr(signal, "SIGHUP"):
def handle_sighup(*args, **kwargs):
# Tell systemd our state, if we're using it. This will silently fail if
# we're not using systemd.
sd_channel = sdnotify.SystemdNotifier()
sd_channel.notify("RELOADING=1")
for i in _sighup_callbacks:
i(hs)
sd_channel.notify("READY=1")
signal.signal(signal.SIGHUP, handle_sighup)
register_sighup(refresh_certificate)
@ -260,6 +269,7 @@ def start(hs, listeners=None):
hs.get_datastore().start_profiling()
setup_sentry(hs)
setup_sdnotify(hs)
except Exception:
traceback.print_exc(file=sys.stderr)
reactor = hs.get_reactor()
@ -292,6 +302,25 @@ def setup_sentry(hs):
scope.set_tag("worker_name", name)
def setup_sdnotify(hs):
"""Adds process state hooks to tell systemd what we are up to.
"""
# Tell systemd our state, if we're using it. This will silently fail if
# we're not using systemd.
sd_channel = sdnotify.SystemdNotifier()
hs.get_reactor().addSystemEventTrigger(
"after",
"startup",
lambda: sd_channel.notify("READY=1\nMAINPID=%s" % (os.getpid())),
)
hs.get_reactor().addSystemEventTrigger(
"before", "shutdown", lambda: sd_channel.notify("STOPPING=1")
)
def install_dns_limiter(reactor, max_dns_requests_in_flight=100):
"""Replaces the resolver with one that limits the number of in flight DNS
requests.

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@ -72,6 +72,7 @@ REQUIREMENTS = [
"netaddr>=0.7.18",
"Jinja2>=2.9",
"bleach>=1.4.3",
"sdnotify>=0.3",
]
CONDITIONAL_REQUIREMENTS = {