mirror of
https://github.com/fumiama/terasu.git
synced 2026-06-05 01:00:23 +08:00
32 lines
673 B
Go
32 lines
673 B
Go
package dns
|
|
|
|
import (
|
|
"context"
|
|
"time"
|
|
|
|
"github.com/FloatTech/ttl"
|
|
"github.com/fumiama/terasu/ip"
|
|
)
|
|
|
|
var lookupTable = ttl.NewCache[string, []string](time.Hour)
|
|
|
|
// LookupHost use default resolver with its fallback
|
|
func LookupHost(ctx context.Context, host string) (addrs []string, err error) {
|
|
addrs = lookupTable.Get(host)
|
|
if len(addrs) == 0 {
|
|
addrs, err = DefaultResolver.LookupHost(ctx, host)
|
|
if err != nil {
|
|
if ip.IsIPv6Available.Get() {
|
|
addrs, err = IPv6Servers.lookupHostDoH(ctx, host)
|
|
} else {
|
|
addrs, err = IPv4Servers.lookupHostDoH(ctx, host)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
lookupTable.Set(host, addrs)
|
|
}
|
|
return
|
|
}
|