298d7d7795
In the event of a 403 (Unauthorized) in oauth, try set a 'oauth_clockskew' variable. In future headers, use a time created by 'time.time() + self.oauth_clockskew'. The idea here is that if the local time is bad (or even if the server time is bad) we will essentially use something that should be similar to the remote clock. This fixes LP: #978127.
234 lines
8.0 KiB
Python
234 lines
8.0 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2012 Canonical Ltd.
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# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
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# Copyright (C) 2012 Yahoo! Inc.
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#
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# Author: Scott Moser <scott.moser@canonical.com>
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# Author: Juerg Haefliger <juerg.haefliger@hp.com>
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# Author: Joshua Harlow <harlowja@yahoo-inc.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from contextlib import closing
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import errno
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import socket
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import time
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import urllib
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import urllib2
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from cloudinit import log as logging
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from cloudinit import version
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LOG = logging.getLogger(__name__)
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class UrlResponse(object):
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def __init__(self, status_code, contents=None, headers=None):
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self._status_code = status_code
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self._contents = contents
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self._headers = headers
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@property
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def code(self):
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return self._status_code
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@property
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def contents(self):
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return self._contents
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@property
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def headers(self):
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return self._headers
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def __str__(self):
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if not self.contents:
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return ''
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else:
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return str(self.contents)
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def ok(self, redirects_ok=False):
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upper = 300
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if redirects_ok:
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upper = 400
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if self.code >= 200 and self.code < upper:
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return True
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else:
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return False
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def readurl(url, data=None, timeout=None,
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retries=0, sec_between=1, headers=None):
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req_args = {}
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req_args['url'] = url
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if data is not None:
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req_args['data'] = urllib.urlencode(data)
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if not headers:
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headers = {
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'User-Agent': 'Cloud-Init/%s' % (version.version_string()),
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}
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req_args['headers'] = headers
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req = urllib2.Request(**req_args)
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retries = max(retries, 0)
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attempts = retries + 1
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excepts = []
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LOG.debug(("Attempting to open '%s' with %s attempts"
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" (%s retries, timeout=%s) to be performed"),
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url, attempts, retries, timeout)
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open_args = {}
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if timeout is not None:
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open_args['timeout'] = int(timeout)
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for i in range(0, attempts):
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try:
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with closing(urllib2.urlopen(req, **open_args)) as rh:
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content = rh.read()
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status = rh.getcode()
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if status is None:
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# This seems to happen when files are read...
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status = 200
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headers = {}
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if rh.headers:
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headers = dict(rh.headers)
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LOG.debug("Read from %s (%s, %sb) after %s attempts",
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url, status, len(content), (i + 1))
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return UrlResponse(status, content, headers)
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except urllib2.HTTPError as e:
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excepts.append(e)
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except urllib2.URLError as e:
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# This can be a message string or
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# another exception instance
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# (socket.error for remote URLs, OSError for local URLs).
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if (isinstance(e.reason, (OSError)) and
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e.reason.errno == errno.ENOENT):
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excepts.append(e.reason)
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else:
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excepts.append(e)
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except Exception as e:
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excepts.append(e)
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if i + 1 < attempts:
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LOG.debug("Please wait %s seconds while we wait to try again",
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sec_between)
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time.sleep(sec_between)
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# Didn't work out
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LOG.debug("Failed reading from %s after %s attempts", url, attempts)
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# It must of errored at least once for code
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# to get here so re-raise the last error
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LOG.debug("%s errors occured, re-raising the last one", len(excepts))
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raise excepts[-1]
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def wait_for_url(urls, max_wait=None, timeout=None,
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status_cb=None, headers_cb=None, sleep_time=1,
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exception_cb=None):
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"""
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urls: a list of urls to try
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max_wait: roughly the maximum time to wait before giving up
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The max time is *actually* len(urls)*timeout as each url will
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be tried once and given the timeout provided.
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timeout: the timeout provided to urllib2.urlopen
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status_cb: call method with string message when a url is not available
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headers_cb: call method with single argument of url to get headers
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for request.
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exception_cb: call method with 2 arguments 'msg' (per status_cb) and
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'exception', the exception that occurred.
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the idea of this routine is to wait for the EC2 metdata service to
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come up. On both Eucalyptus and EC2 we have seen the case where
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the instance hit the MD before the MD service was up. EC2 seems
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to have permenantely fixed this, though.
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In openstack, the metadata service might be painfully slow, and
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unable to avoid hitting a timeout of even up to 10 seconds or more
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(LP: #894279) for a simple GET.
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Offset those needs with the need to not hang forever (and block boot)
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on a system where cloud-init is configured to look for EC2 Metadata
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service but is not going to find one. It is possible that the instance
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data host (169.254.169.254) may be firewalled off Entirely for a sytem,
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meaning that the connection will block forever unless a timeout is set.
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"""
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start_time = time.time()
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def log_status_cb(msg, exc=None):
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LOG.debug(msg)
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if status_cb is None:
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status_cb = log_status_cb
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def timeup(max_wait, start_time):
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return ((max_wait <= 0 or max_wait is None) or
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(time.time() - start_time > max_wait))
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loop_n = 0
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while True:
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sleep_time = int(loop_n / 5) + 1
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for url in urls:
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now = time.time()
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if loop_n != 0:
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if timeup(max_wait, start_time):
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break
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if timeout and (now + timeout > (start_time + max_wait)):
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# shorten timeout to not run way over max_time
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timeout = int((start_time + max_wait) - now)
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reason = ""
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try:
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if headers_cb is not None:
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headers = headers_cb(url)
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else:
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headers = {}
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resp = readurl(url, headers=headers, timeout=timeout)
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if not resp.contents:
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reason = "empty response [%s]" % (resp.code)
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e = ValueError(reason)
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elif not resp.ok():
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reason = "bad status code [%s]" % (resp.code)
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e = ValueError(reason)
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else:
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return url
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except urllib2.HTTPError as e:
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reason = "http error [%s]" % e.code
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except urllib2.URLError as e:
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reason = "url error [%s]" % e.reason
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except socket.timeout as e:
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reason = "socket timeout [%s]" % e
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except Exception as e:
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reason = "unexpected error [%s]" % e
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time_taken = int(time.time() - start_time)
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status_msg = "Calling '%s' failed [%s/%ss]: %s" % (url,
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time_taken,
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max_wait, reason)
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status_cb(status_msg)
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if exception_cb:
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exception_cb(msg=status_msg, exception=e)
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if timeup(max_wait, start_time):
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break
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loop_n = loop_n + 1
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LOG.debug("Please wait %s seconds while we wait to try again",
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sleep_time)
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time.sleep(sleep_time)
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return False
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