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Improve and fix timeout bug in wait_for_entry()

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replication.wait_for_entry() now can wait for an attribute value to
appear on a replica.

Fixed timeout handling caused by bad rounding and comparison. For small
timeouts, the actual time was rounded down. For example for 60 seconds
timeout and fast replica, the query accumulated to about 0.45 seconds
plus 60 seconds sleep. 60.45 is large enough to terminate the loop
"while int(time.time()) < timeout", but not large enough to trigger the
exception in "if int(time.time()) > timeout", because int(60.65) == 60.

See: https://pagure.io/freeipa/issue/7593
Fixes: https://pagure.io/freeipa/issue/7595
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>
This commit is contained in:
Christian Heimes 2018-06-22 09:39:26 +02:00
parent de8d308196
commit 14c869b347
1 changed files with 29 additions and 25 deletions
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54
ipaserver/install/replication.py
View File

@ -20,6 +20,7 @@
from __future__ import print_function, absolute_import
import logging
import itertools
import six
import time
@ -160,40 +161,43 @@ def wait_for_task(conn, dn):
return exit_code
def wait_for_entry(connection, dn, timeout=7200, attr='', quiet=True):
"""Wait for entry and/or attr to show up"""
filter = "(objectclass=*)"
def wait_for_entry(connection, dn, timeout=7200, attr=None, attrvalue='*',
quiet=True):
"""Wait for entry and/or attr to show up
"""
log = logger.debug if quiet else logger.info
attrlist = []
if attr:
filter = "(%s=*)" % attr
if attr is not None:
filterstr = ipaldap.LDAPClient.make_filter_from_attr(attr, attrvalue)
attrlist.append(attr)
timeout += int(time.time())
if not quiet:
sys.stdout.write("Waiting for %s %s:%s " % (connection, dn, attr))
sys.stdout.flush()
entry = None
while not entry and int(time.time()) < timeout:
else:
filterstr = "(objectclass=*)"
log("Waiting for replication (%s) %s %s", connection, dn, filterstr)
entry = []
deadline = time.time() + timeout
for i in itertools.count(start=1):
try:
[entry] = connection.get_entries(
dn, ldap.SCOPE_BASE, filter, attrlist)
entry = connection.get_entries(
dn, ldap.SCOPE_BASE, filterstr, attrlist)
except errors.NotFound:
pass # no entry yet
except Exception as e: # badness
logger.error("Error reading entry %s: %s", dn, e)
raise
if not entry:
if not quiet:
sys.stdout.write(".")
sys.stdout.flush()
time.sleep(1)
if not entry and int(time.time()) > timeout:
raise errors.NotFound(
reason="wait_for_entry timeout for %s for %s" % (connection, dn))
elif entry and not quiet:
logger.error("The waited for entry is: %s", entry)
if entry:
log("Entry found %r", entry)
return
elif time.time() > deadline:
raise errors.NotFound(
reason="wait_for_entry timeout on {} for {}".format(
connection, dn
)
)
else:
if i % 10 == 0:
logger.debug("Still waiting for replication of %s", dn)
time.sleep(1)
class ReplicationManager(object):