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Code Issues Releases Wiki Activity

retrying dns timeouts

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This commit is contained in:
KiekerJan
2022-04-04 22:31:54 +02:00
parent 7ac4b412b0
commit 9b252e0209
2 changed files with 18 additions and 5 deletions
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17
management/status_checks.py
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@@ -12,6 +12,7 @@ import dateutil.parser, dateutil.tz
import idna
import psutil
import postfix_mta_sts_resolver.resolver
import logging
from dns_update import get_dns_zones, build_tlsa_record, get_custom_dns_config, get_secondary_dns, get_custom_dns_records
from web_update import get_web_domains, get_domains_with_a_records
@@ -800,7 +801,7 @@ def query_dns(qname, rtype, nxdomain='[Not Set]', at=None, as_list=False):
resolver.nameservers = [at]
# Set a timeout so that a non-responsive server doesn't hold us back.
resolver.timeout = 5
resolver.timeout = 3
# Do the query.
try:
@@ -808,9 +809,21 @@ def query_dns(qname, rtype, nxdomain='[Not Set]', at=None, as_list=False):
except (dns.resolver.NoNameservers, dns.resolver.NXDOMAIN, dns.resolver.NoAnswer):
# Host did not have an answer for this query; not sure what the
# difference is between the two exceptions.
logging.info("No result for dns lookup %s, %s", qname, rtype)
return nxdomain
except dns.exception.Timeout:
return "[timeout]"
logging.info("Timeout on dns lookup %s, %s. Retrying", qname, rtype)
resolver.timeout = 5
try:
response = resolver.resolve(qname, rtype, search=True)
except (dns.resolver.NoNameservers, dns.resolver.NXDOMAIN, dns.resolver.NoAnswer):
# Host did not have an answer for this query; not sure what the
# difference is between the two exceptions.
logging.info("No result for dns lookup %s, %s (2)", qname, rtype)
return nxdomain
except dns.exception.Timeout:
logging.info("Timeout on dns lookup %s, %s.", qname, rtype)
return "[timeout]"
# Normalize IP addresses. IP address --- especially IPv6 addresses --- can
# be expressed in equivalent string forms. Canonicalize the form before