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avoid sending delete updates to the master server - first check if there is something to delete

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This commit is contained in:
Thomas Waldmann 2014-11-15 17:53:38 +01:00
parent 70ab452484
commit ae06bb4f73
1 changed files with 11 additions and 2 deletions
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13
nsupdate/main/dnstools.py
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@ -132,7 +132,8 @@ def add(fqdn, ipaddr, ttl=60):
def delete(fqdn, rdtype=None):
"""
dns deleter
intelligent dns deleter - first does a lookup on the master server to find
out whether there is a dns entry and only send a 'del' if there is an entry.
:param fqdn: fully qualified domain name (FQDN)
:param rdtype: 'A', 'AAAA' or None (deletes 'A' and 'AAAA')
@ -144,7 +145,15 @@ def delete(fqdn, rdtype=None):
else:
rdtypes = ['A', 'AAAA']
for rdtype in rdtypes:
update_ns(fqdn, rdtype, action='del')
try:
# check if we have a DNS entry
query_ns(fqdn, rdtype)
except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer):
# no dns entry, it is already deleted
pass
else:
# there is a DNS entry, send a del
update_ns(fqdn, rdtype, action='del')
def update(fqdn, ipaddr, ttl=60):