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refactor(net/dnsresolver): finalize release API

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AJ ONeal 2026-09-09 22:29:00 -06:00
parent b67ea17776
commit 9d2f2cb402
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1 changed files with 11 additions and 3 deletions
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14
net/dnsresolver/resolver.go
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@ -21,7 +21,11 @@ const QueryTimeout = 750 * time.Millisecond
// pathological setups from amplifying lookup cost. // pathological setups from amplifying lookup cost.
const DefaultMaxCNAMEHops = 5 const DefaultMaxCNAMEHops = 5
var ErrNoARecord = errors.New("did not resolve to A record") var (
ErrNoARecord = errors.New("did not resolve to A record")
ErrNoAddresses = errors.New("no addresses")
ErrNameNotFound = errors.New("name not found")
)
var FallbackServers = []string{ var FallbackServers = []string{
"208.67.222.123:53", // OpenDNS "208.67.222.123:53", // OpenDNS
@ -127,7 +131,7 @@ func (r *Resolver) LookupIP(ctx context.Context, domain string) ([]net.IP, uint3
} }
} }
if len(ips) == 0 { if len(ips) == 0 {
return nil, 0, fmt.Errorf("no A records for %s", domain) return nil, 0, fmt.Errorf("no A records for %s: %w", domain, ErrNoAddresses)
} }
return ips, ttl, nil return ips, ttl, nil
} }
@ -155,7 +159,11 @@ func (r *Resolver) Exchange(ctx context.Context, m *dns.Msg) (*dns.Msg, uint32,
return return
} }
if resp.Rcode != dns.RcodeSuccess { if resp.Rcode != dns.RcodeSuccess {
results <- result{err: fmt.Errorf("DNS query %s: rcode %s", m.Question[0].Name, dns.RcodeToString[resp.Rcode])} err := fmt.Errorf("DNS query %s: rcode %s", m.Question[0].Name, dns.RcodeToString[resp.Rcode])
if resp.Rcode == dns.RcodeNameError {
err = fmt.Errorf("%w: %w", ErrNameNotFound, err)
}
results <- result{err: err}
return return
} }
var minTTLVal uint32 var minTTLVal uint32