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from django.db.models import Avg, Count, Max, Min, StdDev
from main.utils import cache_function
from .models import MirrorLog, MirrorProtocol, MirrorUrl
import datetime
default_cutoff = datetime.timedelta(hours=24)
def annotate_url(url, delays):
'''Given a MirrorURL object, add a few more attributes to it regarding
status, including completion_pct, delay, and score.'''
url.completion_pct = float(url.success_count) / url.check_count
if url.id in delays:
url_delays = delays[url.id]
url.delay = sum(url_delays, datetime.timedelta()) / len(url_delays)
hours = url.delay.days * 24.0 + url.delay.seconds / 3600.0
if url.completion_pct > 0:
divisor = url.completion_pct
else:
# arbitrary small value
divisor = 0.005
url.score = (hours + url.duration_avg + url.duration_stddev) / divisor
else:
url.delay = None
url.score = None
@cache_function(300)
def get_mirror_statuses(cutoff=default_cutoff):
cutoff_time = datetime.datetime.utcnow() - cutoff
protocols = list(MirrorProtocol.objects.filter(is_download=True))
# I swear, this actually has decent performance...
urls = MirrorUrl.objects.select_related('mirror', 'protocol').filter(
mirror__active=True, mirror__public=True,
protocol__in=protocols,
logs__check_time__gte=cutoff_time).annotate(
check_count=Count('logs'),
success_count=Count('logs__duration'),
last_sync=Max('logs__last_sync'),
last_check=Max('logs__check_time'),
duration_avg=Avg('logs__duration'),
duration_stddev=StdDev('logs__duration')
).order_by('-last_sync', '-duration_avg')
# The Django ORM makes it really hard to get actual average delay in the
# above query, so run a seperate query for it and we will process the
# results here.
times = MirrorLog.objects.filter(is_success=True, last_sync__isnull=False,
check_time__gte=cutoff_time)
delays = {}
for log in times:
delay = log.check_time - log.last_sync
delays.setdefault(log.url_id, []).append(delay)
if urls:
last_check = max([u.last_check for u in urls])
num_checks = max([u.check_count for u in urls])
check_info = MirrorLog.objects.filter(
check_time__gte=cutoff_time).aggregate(
mn=Min('check_time'), mx=Max('check_time'))
if num_checks > 1:
check_frequency = (check_info['mx'] - check_info['mn']) \
/ (num_checks - 1)
else:
check_frequency = None
else:
last_check = None
num_checks = 0
check_frequency = None
for url in urls:
annotate_url(url, delays)
return {
'cutoff': cutoff,
'last_check': last_check,
'num_checks': num_checks,
'check_frequency': check_frequency,
'urls': urls,
}
@cache_function(300)
def get_mirror_errors(cutoff=default_cutoff):
cutoff_time = datetime.datetime.utcnow() - cutoff
errors = MirrorLog.objects.filter(
is_success=False, check_time__gte=cutoff_time,
url__mirror__active=True, url__mirror__public=True).values(
'url__url', 'url__country', 'url__protocol__protocol',
'url__mirror__country', 'error').annotate(
error_count=Count('error'), last_occurred=Max('check_time')
).order_by('-last_occurred', '-error_count')
errors = list(errors)
for err in errors:
err['country'] = err['url__country'] or err['url__mirror__country']
return errors
# vim: set ts=4 sw=4 et:
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