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52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
package tcping
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import (
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"context"
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"fmt"
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"net"
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"strings"
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"time"
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)
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func timeIt(f func() interface{}) (int64, interface{}) {
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startAt := time.Now()
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res := f()
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endAt := time.Now()
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return endAt.UnixNano() - startAt.UnixNano(), res
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}
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// UseCustomeDNS will set the dns to default DNS resolver for global
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func UseCustomeDNS(dns []string) {
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resolver := net.Resolver{
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PreferGo: true,
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Dial: func(ctx context.Context, network, address string) (conn net.Conn, err error) {
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for _, addr := range dns {
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if conn, err = net.Dial("udp", addr+":53"); err != nil {
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continue
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} else {
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return conn, nil
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}
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}
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return
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},
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}
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net.DefaultResolver = &resolver
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}
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// FormatIP - trim spaces and format IP
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//
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// IP - the provided IP
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//
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// string - return "" if the input is neither valid IPv4 nor valid IPv6
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// return IPv4 in format like "192.168.9.1"
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// return IPv6 in format like "[2002:ac1f:91c5:1::bd59]"
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func FormatIP(IP string) string {
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host := strings.Trim(IP, "[ ]")
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if parseIP := net.ParseIP(host); parseIP != nil && parseIP.To4() == nil {
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host = fmt.Sprintf("[%s]", host)
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}
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return host
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}
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