diff options
Diffstat (limited to 'mirrors/utils.py')
| -rw-r--r-- | mirrors/utils.py | 179 |
1 files changed, 127 insertions, 52 deletions
diff --git a/mirrors/utils.py b/mirrors/utils.py index 32fa3587..ba45da5f 100644 --- a/mirrors/utils.py +++ b/mirrors/utils.py @@ -1,21 +1,107 @@ from datetime import timedelta -from django.db.models import Avg, Count, Max, Min, StdDev +from django.db import connection +from django.db.models import Count, Max, Min +from django.utils.dateparse import parse_datetime +from django.utils.timezone import now from django_countries.fields import Country -from main.utils import cache_function, utc_now -from .models import MirrorLog, MirrorProtocol, MirrorUrl +from main.utils import cache_function, database_vendor +from .models import MirrorLog, MirrorUrl -default_cutoff = timedelta(hours=24) +DEFAULT_CUTOFF = timedelta(hours=24) -def annotate_url(url, delays): + +def dictfetchall(cursor): + "Returns all rows from a cursor as a dict." + desc = cursor.description + return [ + dict(zip([col[0] for col in desc], row)) + for row in cursor.fetchall() + ] + + +def status_data(cutoff_time, mirror_id=None): + if mirror_id is not None: + params = [cutoff_time, mirror_id] + mirror_where = 'AND u.mirror_id = %s' + else: + params = [cutoff_time] + mirror_where = '' + + vendor = database_vendor(MirrorUrl) + if vendor == 'sqlite': + sql = """ +SELECT l.url_id, u.mirror_id, + COUNT(l.id) AS check_count, + COUNT(l.duration) AS success_count, + MAX(l.last_sync) AS last_sync, + MAX(l.check_time) AS last_check, + AVG(l.duration) AS duration_avg, + 0.0 AS duration_stddev, + AVG(STRFTIME('%%s', check_time) - STRFTIME('%%s', last_sync)) AS delay +FROM mirrors_mirrorlog l +JOIN mirrors_mirrorurl u ON u.id = l.url_id +WHERE l.check_time >= %s +""" + mirror_where + """ +GROUP BY l.url_id, u.mirror_id +""" + else: + sql = """ +SELECT l.url_id, u.mirror_id, + COUNT(l.id) AS check_count, + COUNT(l.duration) AS success_count, + MAX(l.last_sync) AS last_sync, + MAX(l.check_time) AS last_check, + AVG(l.duration) AS duration_avg, + STDDEV(l.duration) AS duration_stddev, + AVG(check_time - last_sync) AS delay +FROM mirrors_mirrorlog l +JOIN mirrors_mirrorurl u ON u.id = l.url_id +WHERE l.check_time >= %s +""" + mirror_where + """ +GROUP BY l.url_id, u.mirror_id +""" + + cursor = connection.cursor() + cursor.execute(sql, params) + url_data = dictfetchall(cursor) + + # sqlite loves to return less than ideal types + if vendor == 'sqlite': + for item in url_data: + if item['delay'] is not None: + item['delay'] = timedelta(seconds=item['delay']) + if item['last_sync'] is not None: + item['last_sync'] = parse_datetime(item['last_sync']) + item['last_check'] = parse_datetime(item['last_check']) + + return {item['url_id']: item for item in url_data} + + +def annotate_url(url, url_data): '''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) + known_attrs = ( + ('success_count', 0), + ('check_count', 0), + ('completion_pct', None), + ('last_check', None), + ('last_sync', None), + ('delay', None), + ('score', None), + ) + for k, v in known_attrs: + setattr(url, k, v) + for k, v in url_data.items(): + if k not in ('url_id', 'mirror_id'): + setattr(url, k, v) + + if url.check_count > 0: + url.completion_pct = float(url.success_count) / url.check_count + + if url.delay is not None: hours = url.delay.days * 24.0 + url.delay.seconds / 3600.0 if url.completion_pct > 0: @@ -23,43 +109,33 @@ def annotate_url(url, delays): else: # arbitrary small value divisor = 0.005 - url.score = (hours + url.duration_avg + url.duration_stddev) / divisor - else: - url.delay = None - url.score = None + stddev = url.duration_stddev or 0.0 + url.score = (hours + url.duration_avg + stddev) / divisor -@cache_function(123) -def get_mirror_statuses(cutoff=default_cutoff): - cutoff_time = utc_now() - cutoff - protocols = list(MirrorProtocol.objects.filter(is_download=True)) - # I swear, this actually has decent performance... - urls = MirrorUrl.objects.select_related('mirror', 'protocol').filter( +def get_mirror_statuses(cutoff=DEFAULT_CUTOFF, mirror_id=None): + cutoff_time = now() - cutoff + + valid_urls = MirrorUrl.objects.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')) - - # 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) + logs__check_time__gte=cutoff_time).distinct() + + if mirror_id: + valid_urls = valid_urls.filter(mirror_id=mirror_id) + + url_data = status_data(cutoff_time, mirror_id) + urls = MirrorUrl.objects.select_related('mirror', 'protocol').filter( + id__in=valid_urls).order_by('mirror__id', 'url') if urls: - last_check = max([u.last_check for u in urls]) + for url in urls: + annotate_url(url, url_data.get(url.id, {})) + last_check = max([u.last_check for u in urls if u.last_check]) num_checks = max([u.check_count for u in urls]) - check_info = MirrorLog.objects.filter( - check_time__gte=cutoff_time).aggregate( + check_info = MirrorLog.objects.filter(check_time__gte=cutoff_time) + if mirror_id: + check_info = check_info.filter(url__mirror_id=mirror_id) + 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']) \ @@ -71,9 +147,6 @@ def get_mirror_statuses(cutoff=default_cutoff): num_checks = 0 check_frequency = None - for url in urls: - annotate_url(url, delays) - return { 'cutoff': cutoff, 'last_check': last_check, @@ -83,29 +156,31 @@ def get_mirror_statuses(cutoff=default_cutoff): } -@cache_function(117) -def get_mirror_errors(cutoff=default_cutoff): - cutoff_time = utc_now() - cutoff +def get_mirror_errors(cutoff=DEFAULT_CUTOFF, mirror_id=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', 'error').annotate( + 'url__mirror__tier', 'error').annotate( error_count=Count('error'), last_occurred=Max('check_time') ).order_by('-last_occurred', '-error_count') + + if mirror_id: + errors = errors.filter(url__mirror_id=mirror_id) + errors = list(errors) for err in errors: - ctry_code = err['url__country'] or err['url__mirror__country'] - err['country'] = Country(ctry_code) + err['country'] = Country(err['url__country']) return errors @cache_function(295) -def get_mirror_url_for_download(cutoff=default_cutoff): +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 = utc_now() - cutoff + cutoff_time = now() - cutoff status_data = MirrorLog.objects.filter( check_time__gte=cutoff_time).aggregate( Max('check_time'), Max('last_sync')) @@ -123,7 +198,7 @@ def get_mirror_url_for_download(cutoff=default_cutoff): 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] + filtered_urls = mirror_urls.filter(country='')[:1] if not filtered_urls: filtered_urls = mirror_urls[:1] if not filtered_urls: |