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dns.go
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dns.go
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package log
import (
"net"
"strings"
"time"
)
type DNSLog struct {
Server string
Domain string
Result []net.IP
Status dnsStatus
Elapsed time.Duration
Error error
}
func (l *DNSLog) String() string {
builder := &strings.Builder{}
// Server got answer: domain -> [ip1, ip2] 23ms
builder.WriteString(l.Server)
builder.WriteString(" ")
builder.WriteString(string(l.Status))
builder.WriteString(" ")
builder.WriteString(l.Domain)
builder.WriteString(" -> [")
builder.WriteString(joinNetIP(l.Result))
builder.WriteString("]")
if l.Elapsed > 0 {
builder.WriteString(" ")
builder.WriteString(l.Elapsed.String())
}
if l.Error != nil {
builder.WriteString(" <")
builder.WriteString(l.Error.Error())
builder.WriteString(">")
}
return builder.String()
}
type dnsStatus string
var (
DNSQueried = dnsStatus("got answer:")
DNSCacheHit = dnsStatus("cache HIT:")
)
func joinNetIP(ips []net.IP) string {
if len(ips) == 0 {
return ""
}
sips := make([]string, 0, len(ips))
for _, ip := range ips {
sips = append(sips, ip.String())
}
return strings.Join(sips, ", ")
}