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perf(checker): optimize DNS lookup to reduce network calls (#1593)
Co-authored-by: shuklavedant01 <shuklavedant001@gmail.com>
authored by
Vedant Shukla
shuklavedant01
and committed by
GitHub
562a9b97
b321bc21
+13
-37
+13
-37
apps/checker/checker/dns.go
+13
-37
apps/checker/checker/dns.go
···
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func Dns(ctx context.Context, host string) (*DnsResponse, error) {
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logger:= log.Ctx(ctx).With().Str("monitor", host).Logger()
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-
A, err := lookupA(host)
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+
ips, err := net.LookupIP(host)
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if err != nil {
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-
logger.Error().Err(err).Msg("DNS A record lookup failed")
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-
return nil, fmt.Errorf("failed to lookup A record: %w", err)
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+
logger.Error().Err(err).Msg("DNS IP lookup failed")
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+
return nil, fmt.Errorf("failed to lookup IPs: %w", err)
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}
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-
AAAA, err := lookupAAAA(host)
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if err != nil {
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logger.Error().Err(err).Msg("DNS AAAA record lookup failed")
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return nil, fmt.Errorf("failed to lookup AAAA record: %w", err)
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+
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+
A := []string{}
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+
AAAA := []string{}
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+
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+
for _, ip := range ips {
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+
if ip.To4() != nil {
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+
A = append(A, ip.String())
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+
} else {
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+
AAAA = append(AAAA, ip.String())
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+
}
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}
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CNAME,err := lookupCNAME(host)
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if err != nil {
···
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return response, nil
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}
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func lookupA(domain string) ([]string, error) {
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A := []string{}
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ips, err := net.LookupIP(domain)
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if err != nil {
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return nil, err
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}
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-
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for _, ip := range ips {
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if ip.To4() != nil {
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A = append(A, ip.String())
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}
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}
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return A, nil
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}
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-
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func lookupAAAA(domain string) ([]string, error) {
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AAAA := []string{}
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ips, err := net.LookupIP(domain)
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if err != nil {
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return nil, err
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}
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-
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for _, ip := range ips {
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if ip.To16() != nil && ip.To4() == nil {
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-
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AAAA = append(AAAA, ip.String())
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}
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}
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return AAAA, nil
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}
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func lookupCNAME(domain string) (string, error) {
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cname, err := net.LookupCNAME(domain)