cmsmanage/cmsmanage/views.py
Adam Goldsmith 4d66f76a02
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healthcheck: Don't report error for tasks that are probably running
2024-05-13 21:44:10 -04:00

93 lines
2.7 KiB
Python

import dataclasses
import datetime
from collections.abc import Iterable
from django.http import HttpRequest, HttpResponse
from django.utils import timezone
from django_q.conf import Conf
from django_q.models import Schedule, Task
from django_q.status import Stat
@dataclasses.dataclass
class CheckResult:
message: str
ok: bool
@dataclasses.dataclass
class CheckResultOk(CheckResult):
message: str
ok: bool = True
@dataclasses.dataclass
class CheckResultFailure(CheckResult):
message: str
ok: bool = False
def _check_clusters() -> CheckResult:
clusters = Stat.get_all()
happy_clusters = [
cluster for cluster in clusters if cluster.status in [Conf.IDLE, Conf.WORKING]
]
if not len(clusters):
return CheckResultFailure("No clusters running!")
elif len(happy_clusters) != len(clusters):
return CheckResultFailure(f"{len(happy_clusters)}/{len(clusters)} clusters up")
else:
return CheckResultOk(f"{len(happy_clusters)}/{len(clusters)} clusters up")
def _check_task(now: datetime.datetime, schedule: Schedule) -> CheckResult:
if not schedule.task:
return CheckResultFailure(f"Scheduled task {schedule} has never run!")
else:
try:
task = Task.objects.get(id=schedule.task)
except Task.DoesNotExist:
if now - schedule.next_run > datetime.timedelta(minutes=5):
return CheckResultFailure(
f"Scheduled task {schedule}'s last task doesn't exist, and is probably not still running!"
)
else:
return CheckResultOk(
f"Schedule {schedule} has no task, but probably running now"
)
if not task.success:
return CheckResultFailure(
f"Scheduled task {schedule} failed at {task.started}"
)
elif now - schedule.next_run > datetime.timedelta(hours=2):
return CheckResultFailure(
f"Scheduled task {schedule} stale, last run at {task.started}"
)
else:
return CheckResultOk(
f"Scheduled task {schedule} ok, last run at {task.started}"
)
def _check_tasks() -> Iterable[CheckResult]:
now = timezone.now()
for schedule in Schedule.objects.all():
yield _check_task(now, schedule)
def healthcheck(request: HttpRequest):
checks: list[CheckResult] = [_check_clusters(), *_check_tasks()]
all_ok = all(check.ok for check in checks)
messages = (check.message for check in sorted(checks, key=lambda c: c.ok))
return HttpResponse(
("OK: " if all_ok else "CRITICAL: ") + "\n".join(messages),
content_type="text/plain",
status=200 if all_ok else 500,
)