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mirror of https://github.com/v2fly/v2ray-core.git synced 2024-12-22 18:17:52 -05:00
v2fly/dns.go
2018-01-10 12:22:37 +01:00

58 lines
828 B
Go

package core
import "net"
import "sync"
// DNSClient is a V2Ray feature for querying DNS information.
type DNSClient interface {
Feature
LookupIP(host string) ([]net.IP, error)
}
type syncDNSClient struct {
sync.RWMutex
DNSClient
}
func (d *syncDNSClient) LookupIP(host string) ([]net.IP, error) {
d.RLock()
defer d.RUnlock()
if d.DNSClient == nil {
return net.LookupIP(host)
}
return d.DNSClient.LookupIP(host)
}
func (d *syncDNSClient) Start() error {
d.RLock()
defer d.RUnlock()
if d.DNSClient == nil {
return nil
}
return d.DNSClient.Start()
}
func (d *syncDNSClient) Close() {
d.RLock()
defer d.RUnlock()
if d.DNSClient != nil {
d.DNSClient.Close()
}
}
func (d *syncDNSClient) Set(client DNSClient) {
if client == nil {
return
}
d.Lock()
defer d.Unlock()
d.DNSClient = client
}