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# -*- coding: utf-8 -*-
"""
mirrorcheck command
Poll every active mirror URL we have in the database, grab the 'lastsync' file,
and record details about how long it took and how up to date the mirror is. If
we encounter errors, record those as well.
Usage: ./manage.py mirrorcheck
"""
from collections import deque
from datetime import datetime
from httplib import HTTPException
import logging
import os
from optparse import make_option
from pytz import utc
import re
import socket
import subprocess
import sys
import time
import tempfile
from threading import Thread
import types
from Queue import Queue, Empty
import urllib2
from django.core.management.base import NoArgsCommand
from django.db import transaction
from django.utils.timezone import now
from main.utils import database_vendor
from mirrors.models import MirrorUrl, MirrorLog
logging.basicConfig(
level=logging.WARNING,
format='%(asctime)s -> %(levelname)s: %(message)s',
datefmt='%Y-%m-%d %H:%M:%S',
stream=sys.stderr)
logger = logging.getLogger()
class Command(NoArgsCommand):
option_list = NoArgsCommand.option_list + (
make_option('-t', '--timeout', dest='timeout', default='10',
help='Timeout value for connecting to URL'),
)
help = "Runs a check on all known mirror URLs to determine their up-to-date status."
def handle_noargs(self, **options):
v = int(options.get('verbosity', 0))
timeout = int(options.get('timeout', 10))
if v == 0:
logger.level = logging.ERROR
elif v == 1:
logger.level = logging.WARNING
elif v == 2:
logger.level = logging.DEBUG
urls = MirrorUrl.objects.select_related('protocol').filter(
mirror__active=True, mirror__public=True)
pool = MirrorCheckPool(urls, timeout)
pool.run()
return 0
def parse_lastsync(log, data):
'''lastsync file should be an epoch value created by us.'''
try:
parsed_time = datetime.utcfromtimestamp(int(data))
log.last_sync = parsed_time.replace(tzinfo=utc)
except ValueError:
# it is bad news to try logging the lastsync value;
# sometimes we get a crazy-encoded web page.
# if we couldn't parse a time, this is a failure.
log.last_sync = None
log.error = "Could not parse time from lastsync"
log.is_success = False
def check_mirror_url(mirror_url, timeout):
url = mirror_url.url + 'lastsync'
logger.info("checking URL %s", url)
log = MirrorLog(url=mirror_url, check_time=now())
headers = {'User-Agent': 'archweb/1.0'}
req = urllib2.Request(url, None, headers)
try:
start = time.time()
result = urllib2.urlopen(req, timeout=timeout)
data = result.read()
result.close()
end = time.time()
parse_lastsync(log, data)
log.duration = end - start
logger.debug("success: %s, %.2f", url, log.duration)
except urllib2.HTTPError as e:
if e.code == 404:
# we have a duration, just not a success
end = time.time()
log.duration = end - start
log.is_success = False
log.error = str(e)
logger.debug("failed: %s, %s", url, log.error)
except urllib2.URLError as e:
log.is_success = False
log.error = e.reason
if isinstance(e.reason, types.StringTypes) and \
re.search(r'550.*No such file', e.reason):
# similar to 404 case above, still record duration
end = time.time()
log.duration = end - start
if isinstance(e.reason, socket.timeout):
log.error = "Connection timed out."
elif isinstance(e.reason, socket.error):
log.error = e.reason.args[1]
logger.debug("failed: %s, %s", url, log.error)
except HTTPException as e:
# e.g., BadStatusLine
log.is_success = False
log.error = "Exception in processing HTTP request."
logger.debug("failed: %s, %s", url, log.error)
except socket.timeout as e:
log.is_success = False
log.error = "Connection timed out."
logger.debug("failed: %s, %s", url, log.error)
except socket.error as e:
log.is_success = False
log.error = str(e)
logger.debug("failed: %s, %s", url, log.error)
return log
def check_rsync_url(mirror_url, timeout):
url = mirror_url.url + 'lastsync'
logger.info("checking URL %s", url)
log = MirrorLog(url=mirror_url, check_time=now())
tempdir = tempfile.mkdtemp()
lastsync_path = os.path.join(tempdir, 'lastsync')
rsync_cmd = ["rsync", "--quiet", "--contimeout=%d" % timeout,
"--timeout=%d" % timeout, url, lastsync_path]
try:
with open(os.devnull, 'w') as devnull:
proc = subprocess.Popen(rsync_cmd, stdout=devnull,
stderr=subprocess.PIPE)
start = time.time()
_, errdata = proc.communicate()
end = time.time()
log.duration = end - start
if proc.returncode != 0:
logger.debug("error: %s, %s", url, errdata)
log.is_success = False
log.error = errdata.strip()
# look at rsync error code- if we had a command error or timed out,
# don't record a duration as it is misleading
if proc.returncode in (1, 30, 35):
log.duration = None
else:
logger.debug("success: %s, %.2f", url, log.duration)
with open(lastsync_path, 'r') as lastsync:
parse_lastsync(log, lastsync.read())
finally:
if os.path.exists(lastsync_path):
os.unlink(lastsync_path)
os.rmdir(tempdir)
return log
def mirror_url_worker(work, output, timeout):
while True:
try:
url = work.get(block=False)
try:
if url.protocol.protocol == 'rsync':
log = check_rsync_url(url, timeout)
else:
log = check_mirror_url(url, timeout)
output.append(log)
finally:
work.task_done()
except Empty:
return 0
class MirrorCheckPool(object):
def __init__(self, urls, timeout=10, num_threads=10):
self.tasks = Queue()
self.logs = deque()
for i in list(urls):
self.tasks.put(i)
self.threads = []
for i in range(num_threads):
thread = Thread(target=mirror_url_worker,
args=(self.tasks, self.logs, timeout))
thread.daemon = True
self.threads.append(thread)
@transaction.commit_on_success
def run(self):
logger.debug("starting threads")
for thread in self.threads:
thread.start()
logger.debug("joining on all threads")
self.tasks.join()
logger.debug("processing %d log entries", len(self.logs))
if database_vendor(MirrorLog, mode='write') == 'sqlite':
for log in self.logs:
log.save(force_insert=True)
else:
MirrorLog.objects.bulk_create(self.logs)
logger.debug("log entries saved")
# vim: set ts=4 sw=4 et:
|
