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|
#!/usr/bin/python
import logging
import socket
import urllib2
import time
import rfc822
import re
import tempfile
import subprocess
import os
import urlparse
class GardCheck:
# Base class which provides some helper functions
def __init__(self, url, log=True, timeout=30):
# Munge trailing '/' so we can sanely concatenate paths later
self.url = url.rstrip('/')
if log:
self.logger = logging.getLogger()
else:
self.logger = None
# By default urllib2 has no timeout, so we need to set a sane
# global maximum
socket.setdefaulttimeout(timeout)
def log_info(self, msg):
if self.logger is not None:
self.logger.info(msg)
def log_error(self, msg):
if self.logger is not None:
self.logger.error(msg)
def check_file_exists(self, url):
ret = True
try:
f = urllib2.urlopen(url)
if len(f.read()) == 0:
raise IOError
except:
ret = False
return ret
# Converts an rsync URL in the rsync://server/module form to a string
# that can be passed to the rsync command (server::module)
def _rsync_url_to_cmd(self, url, path):
urlp = urlparse.urlparse(self.url)
if len(urlp.path) > 1:
# strip leading '/' from URL path
path = urlp.path[1:] + '/' + path
target = '%s::%s' % (urlp.netloc, path)
return target
# Gets a file over rsync and puts it in a temporary directory,
# if specified (assumes URL is the form rsync://server/module
# and takes path relative to this)
def get_file_rsync(self, path, dir='.'):
target = self._rsync_url_to_cmd(self.url, path)
retcode = subprocess.call(['rsync', '-aqPz', '--no-motd',
'--contimeout=30', target, dir])
if retcode > 0:
logging.error('rsync returned %d during gentoo-portage check' % retcode)
return False
return True
def check_rsync_writable(self, path):
target = self._rsync_url_to_cmd(self.url, path)
# Create a test file
file = tempfile.NamedTemporaryFile()
file.write('THIS_SHOULD_NOT_WORK');
file.flush()
retcode = subprocess.call(['rsync', '-aqP', '--no-motd',
'--contimeout=30', file, target])
file.close()
return retcode > 0
# Takes the URL to a timestamp.{chk|x} file and returns the
# corresponding time stamp in seconds
def _get_timestamp_from_url(self, url):
try:
# TODO: Add a timeout
f = urllib2.urlopen(url)
date = f.read()
f.close()
if date is None or len(date) == 0:
raise ValueError
try:
# timestamp.chk format
ts = self.timestamp_to_secs(date)
except:
# timestamp.x format?
ts = float(date.split(' ')[0])
except:
return None
return ts
def get_lag(self, url):
ts = self._get_timestamp_from_url(url)
now = time.time()
if ts is None or now < ts:
return None
return now - ts
def humanize_time(self, secs):
mins, secs = divmod(secs, 60)
hours, mins = divmod(mins, 60)
days, hours = divmod(hours, 24)
return '%02dd %02dh %02dm %02ds' % (days, hours, mins, secs)
def timestamp_to_secs(self, ts):
return rfc822.mktime_tz(rfc822.parsedate_tz(ts))
# OPTIONAL: Override or supplement these in child classes if desired.
def check_name(self):
return re.sub('.*\.|(Check$)', '', str(self.__class__))
def check(self, maxlag):
lag = self.lag()
if lag is None:
self.log_error('Could not get %s timestamp for %s' % (self.check_name(), self.url))
ret = False
elif lag > maxlag:
self.log_error('%s at %s is lagging (delta is %s)' \
% (self.check_name(), self.url, self.humanize_time(lag)))
ret = False
else:
ret = True
return ret
# REQUIRED: You must override these in child classes
def lag(self):
return None
# Check distfiles mirrors
class DistfilesCheck(GardCheck):
def lag(self):
scheme = urlparse.urlparse(self.url).scheme
if scheme == 'http' or scheme == 'ftp':
path = '/distfiles/timestamp.chk'
lag = self.get_lag(self.url + path)
elif scheme == 'rsync':
file = 'timestamp.x'
path = 'distfiles/' + file
if self.get_file_rsync(path) is False:
return None
url = 'file://%s/%s' % (os.path.abspath(''), file)
lag = self.get_lag(url)
os.remove(file)
return lag
# Check experimental mirrors
class ExperimentalCheck(GardCheck):
def lag(self):
path = '/experimental/.timestamp-experimental.x'
return self.get_lag(self.url + path)
# Check snapshot mirrors
class SnapshotsCheck(GardCheck):
def lag(self):
path = '/snapshots/.timestamp-snapshots.x'
return self.get_lag(self.url + path)
# Check releases mirrors
class ReleasesCheck(GardCheck):
def lag(self):
path = '/releases/.test/timestamp.x'
return self.get_lag(self.url + path)
def check(self, maxlag):
# Call the superclass first if exists
try: fun = getattr(GardCheck, 'check')
except AttributeError: pass
else: ret = fun(self, maxlag)
# Verify that releases/.test/THIS-FILE-SHOULD-NOT-BE-PUBLIC.txt
# is not world readable
if self.check_file_exists(self.url+'/releases/.test/THIS-FILE-SHOULD-NOT-BE-PUBLIC.txt'):
self.log_error('Releases permission check failed on %s' % self.url)
ret = False
return ret
class PortageCheck(GardCheck):
# Takes a URL in rsync://host/module/path form
def lag(self):
file = 'timestamp.chk'
path = 'gentoo-portage/metadata/' + file
if self.get_file_rsync(path) is False:
return None
# This is Linux-specific, but who's going to run this on
# Windows anyway? :D
url = 'file://%s/%s' % (os.path.abspath(''), file)
lag = self.get_lag(url)
os.remove(file)
return lag
|
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