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139 lines
4.2 KiB
139 lines
4.2 KiB
import time
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from threading import Thread
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from django.core.management.base import BaseCommand
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from django.utils import timezone
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from hc.api.models import Check, Flip
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def notify(flip_id, stdout):
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flip = Flip.objects.get(id=flip_id)
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check = flip.owner
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# Set the historic status here but *don't save it*.
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# It would be nicer to pass the status explicitly, as a separate parameter.
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check.status = flip.new_status
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# And just to make sure it doesn't get saved by a future coding accident:
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setattr(check, "save", None)
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tmpl = "Sending alert, status=%s, code=%s\n"
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stdout.write(tmpl % (flip.new_status, check.code))
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# Set dates for followup nags
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if flip.new_status == "down":
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check.project.set_next_nag_date()
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# Send notifications
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errors = flip.send_alerts()
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for ch, error in errors:
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stdout.write("ERROR: %s %s %s\n" % (ch.kind, ch.value, error))
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def notify_on_thread(flip_id, stdout):
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t = Thread(target=notify, args=(flip_id, stdout))
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t.start()
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class Command(BaseCommand):
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help = "Sends UP/DOWN email alerts"
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def add_arguments(self, parser):
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parser.add_argument(
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"--no-loop",
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action="store_false",
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dest="loop",
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default=True,
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help="Do not keep running indefinitely in a 2 second wait loop",
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)
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parser.add_argument(
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"--no-threads",
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action="store_false",
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dest="use_threads",
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default=False,
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help="Send alerts synchronously, without using threads",
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)
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def process_one_flip(self, use_threads=True):
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""" Find unprocessed flip, send notifications. """
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# Order by processed, otherwise Django will automatically order by id
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# and make the query less efficient
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q = Flip.objects.filter(processed=None).order_by("processed")
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flip = q.first()
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if flip is None:
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return False
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q = Flip.objects.filter(id=flip.id, processed=None)
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num_updated = q.update(processed=timezone.now())
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if num_updated != 1:
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# Nothing got updated: another worker process got there first.
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return True
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if use_threads:
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notify_on_thread(flip.id, self.stdout)
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else:
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notify(flip.id, self.stdout)
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return True
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def handle_going_down(self):
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""" Process a single check going down. """
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now = timezone.now()
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# In PostgreSQL, add this index to run the below query efficiently:
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# CREATE INDEX api_check_up ON api_check (alert_after) WHERE status = 'up'
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q = Check.objects.filter(alert_after__lt=now).exclude(status="down")
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# Sort by alert_after, to avoid unnecessary sorting by id:
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check = q.order_by("alert_after").first()
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if check is None:
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return False
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old_status = check.status
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q = Check.objects.filter(id=check.id, status=old_status)
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if check.get_status(with_started=False) != "down":
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# It is not down yet. Update alert_after
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q.update(alert_after=check.going_down_after())
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return True
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# Atomically update status
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flip_time = check.going_down_after()
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num_updated = q.update(alert_after=None, status="down")
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if num_updated != 1:
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# Nothing got updated: another worker process got there first.
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return True
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flip = Flip(owner=check)
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flip.created = flip_time
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flip.old_status = old_status
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flip.new_status = "down"
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flip.save()
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return True
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def handle(self, use_threads=True, loop=True, *args, **options):
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self.stdout.write("sendalerts is now running\n")
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i, sent = 0, 0
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while True:
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# Create flips for any checks going down
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while self.handle_going_down():
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pass
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# Process the unprocessed flips
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while self.process_one_flip(use_threads):
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sent += 1
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if not loop:
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break
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time.sleep(2)
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i += 1
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if i % 60 == 0:
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timestamp = timezone.now().isoformat()
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self.stdout.write("-- MARK %s --\n" % timestamp)
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return "Sent %d alert(s)" % sent
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