sneak 9282119b41 resolver, watcher: a record type whose query fails keeps its previous records (closes #231) ...

The resolver lists in FailedTypes each record type whose query to a
nameserver got no usable reply (no reply, a code other than NOERROR or
NXDOMAIN, a referral, or a truncated reply whose TCP retry failed) and
logs it unless shutdown cut it short. A nameserver that answered no
type has failed.
The watcher saves such a type in failedTypes with the previous check's
records, leaves it out of the comparison with other nameservers on that
check, and compares it with the next answer. When the previous check
did not know its records either, it is also in unknownTypes and not
compared until it answers. A nameserver whose A, AAAA or CNAME query
failed is no answer when following a CNAME or resolving addresses.

Model: opus-5-5

2026-10-02 08:43:19 +00:00

..

cancelled_test.go

watcher: a lookup cut short by shutdown is not logged as an error (closes #229)

2026-10-02 08:56:52 +02:00

cname_test.go

resolver, watcher: a record type whose query fails keeps its previous records (closes #231)

2026-10-02 08:43:19 +00:00

export_test.go

resolver, watcher: a record type whose query fails keeps its previous records (closes #231)

2026-10-02 08:43:19 +00:00

failedtype_test.go

resolver, watcher: a record type whose query fails keeps its previous records (closes #231)

2026-10-02 08:43:19 +00:00

inconsistency_test.go

resolver: store a name's CNAME once per nameserver (closes #220)

2026-10-02 09:09:51 +02:00

interfaces.go

watcher: notify NS query failure and recovery (closes #104)

2026-10-01 22:23:33 +02:00

message_test.go

watcher: Port Change notifications list domains apart from hostnames (closes #248)

2026-10-02 10:42:07 +02:00

nsaddress_test.go

watcher: notify nameserver address changes (closes #105)

2026-10-01 23:23:26 +02:00

nsfailure_test.go

resolver, watcher: a record type whose query fails keeps its previous records (closes #231)

2026-10-02 08:43:19 +00:00

watcher_test.go

watcher: startup notification no longer says every endpoint works (closes #230)

2026-10-02 08:42:35 +02:00

watcher.go

resolver, watcher: a record type whose query fails keeps its previous records (closes #231)

2026-10-02 08:43:19 +00:00