1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
from datetime import timedelta
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 main.utils import cache_function, database_vendor
from .models import MirrorLog, MirrorUrl
DEFAULT_CUTOFF = timedelta(hours=24)
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.last_sync) 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.last_sync) 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.'''
# set up some sane default values in case we are missing anything
url.success_count = 0
url.check_count = 0
url.completion_pct = None
url.duration_avg = None
url.duration_stddev = None
url.last_check = None
url.last_sync = None
url.delay = None
url.score = None
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 > 0.0:
divisor = url.completion_pct
else:
# arbitrary small value
divisor = 0.005
stddev = url.duration_stddev or 0.0
url.score = (hours + url.duration_avg + stddev) / divisor
return url
@cache_function(178)
def get_mirror_statuses(cutoff=DEFAULT_CUTOFF, mirror_id=None, show_all=False):
cutoff_time = now() - cutoff
urls = MirrorUrl.objects.select_related(
'mirror', 'protocol').order_by('mirror__id', 'url')
if mirror_id:
urls = urls.filter(mirror_id=mirror_id)
if not show_all:
urls = urls.filter(active=True, mirror__active=True,
mirror__public=True)
if urls:
url_data = status_data(cutoff_time, mirror_id)
urls = [annotate_url(url, url_data.get(url.id, {})) for url in urls]
last_check = max([u.last_check for u in urls if u.last_check] or [None])
num_checks = max(u.check_count for u in urls)
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']) \
/ (num_checks - 1)
else:
check_frequency = None
else:
urls = []
last_check = None
num_checks = 0
check_frequency = None
return {
'cutoff': cutoff,
'last_check': last_check,
'num_checks': num_checks,
'check_frequency': check_frequency,
'urls': urls,
}
def get_mirror_errors(cutoff=DEFAULT_CUTOFF, mirror_id=None, show_all=False):
cutoff_time = now() - cutoff
errors = MirrorLog.objects.filter(
is_success=False, check_time__gte=cutoff_time,
url__mirror__public=True).values('url__id', '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)
if not show_all:
errors = errors.filter(url__active=True, url__mirror__active=True,
url__mirror__public=True)
errors = list(errors)
to_fetch = [err['url__id'] for err in errors]
urls = MirrorUrl.objects.select_related(
'mirror', 'protocol').in_bulk(to_fetch)
for err in errors:
err['url'] = urls[err['url__id']]
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
log_data = MirrorLog.objects.filter(
check_time__gte=cutoff_time).aggregate(
Max('check_time'), Max('last_sync'))
if log_data['check_time__max'] is not None:
min_check_time = log_data['check_time__max'] - timedelta(minutes=5)
min_sync_time = log_data['last_sync__max'] - timedelta(minutes=20)
best_logs = MirrorLog.objects.select_related('url').filter(
is_success=True,
check_time__gte=min_check_time, last_sync__gte=min_sync_time,
url__active=True,
url__mirror__public=True, url__mirror__active=True,
url__protocol__default=True).order_by(
'duration')[:1]
if best_logs:
return best_logs[0].url
mirror_urls = MirrorUrl.objects.filter(active=True,
mirror__public=True, mirror__active=True,
protocol__default=True)[:1]
if not mirror_urls:
return None
return mirror_urls[0]
# vim: set ts=4 sw=4 et:
|
