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from datetime import timedelta
from django.db.models import Avg, Count, Max, Min, StdDev
from django.utils.timezone import now
from django_countries.fields import Country
from main.utils import cache_function, database_vendor
from .models import MirrorLog, MirrorProtocol, MirrorUrl
DEFAULT_CUTOFF = 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, 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(123)
def get_mirror_statuses(cutoff=DEFAULT_CUTOFF, mirror_ids=None):
cutoff_time = now() - cutoff
# I swear, this actually has decent performance...
urls = MirrorUrl.objects.select_related('mirror', 'protocol').filter(
mirror__active=True, mirror__public=True,
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'))
if mirror_ids:
urls = urls.filter(mirror_id__in=mirror_ids)
vendor = database_vendor(MirrorUrl)
if vendor != 'sqlite':
urls = urls.annotate(duration_stddev=StdDev('logs__duration'))
# 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.values_list(
'url_id', 'check_time', 'last_sync').filter(
is_success=True, last_sync__isnull=False,
check_time__gte=cutoff_time)
if mirror_ids:
times = times.filter(url__mirror_id__in=mirror_ids)
delays = {}
for url_id, check_time, last_sync in times:
delay = check_time - last_sync
delays.setdefault(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)
if mirror_ids:
check_info = check_info.filter(url__mirror_id__in=mirror_ids)
check_info = check_info.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:
# fake the standard deviation for local testing setups
if vendor == 'sqlite':
setattr(url, 'duration_stddev', 0.0)
annotate_url(url, delays)
return {
'cutoff': cutoff,
'last_check': last_check,
'num_checks': num_checks,
'check_frequency': check_frequency,
'urls': urls,
}
@cache_function(117)
def get_mirror_errors(cutoff=DEFAULT_CUTOFF, mirror_ids=None):
cutoff_time = now() - 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', 'url__mirror__tier', 'error').annotate(
error_count=Count('error'), last_occurred=Max('check_time')
).order_by('-last_occurred', '-error_count')
if mirror_ids:
urls = urls.filter(mirror_id__in=mirror_ids)
errors = list(errors)
for err in errors:
ctry_code = err['url__country'] or err['url__mirror__country']
err['country'] = Country(ctry_code)
return errors
@cache_function(295)
def get_mirror_url_for_download(cutoff=DEFAULT_CUTOFF):
'''Find a good mirror URL to use for package downloads. If we have mirror
status data available, it is used to determine a good choice by looking at
the last batch of status rows.'''
cutoff_time = now() - cutoff
status_data = MirrorLog.objects.filter(
check_time__gte=cutoff_time).aggregate(
Max('check_time'), Max('last_sync'))
if status_data['check_time__max'] is not None:
min_check_time = status_data['check_time__max'] - timedelta(minutes=5)
min_sync_time = status_data['last_sync__max'] - timedelta(minutes=20)
best_logs = MirrorLog.objects.filter(is_success=True,
check_time__gte=min_check_time, last_sync__gte=min_sync_time,
url__mirror__public=True, url__mirror__active=True,
url__protocol__default=True).order_by(
'duration')[:1]
if best_logs:
return MirrorUrl.objects.get(id=best_logs[0].url_id)
mirror_urls = MirrorUrl.objects.filter(
mirror__public=True, mirror__active=True, protocol__default=True)
# look first for a country-agnostic URL, then fall back to any HTTP URL
filtered_urls = mirror_urls.filter(mirror__country='')[:1]
if not filtered_urls:
filtered_urls = mirror_urls[:1]
if not filtered_urls:
return None
return filtered_urls[0]
# vim: set ts=4 sw=4 et:
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