116 lines
2.3 KiB
Go
116 lines
2.3 KiB
Go
package main
|
|
|
|
import (
|
|
"flag"
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
"os"
|
|
"os/signal"
|
|
|
|
"github.com/anacrolix/torrent/dht"
|
|
)
|
|
|
|
var (
|
|
tableFileName = flag.String("tableFile", "", "name of file for storing node info")
|
|
serveAddr = flag.String("serveAddr", ":0", "local UDP address")
|
|
|
|
s *dht.Server
|
|
)
|
|
|
|
func loadTable() error {
|
|
if *tableFileName == "" {
|
|
return nil
|
|
}
|
|
f, err := os.Open(*tableFileName)
|
|
if os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
if err != nil {
|
|
return fmt.Errorf("error opening table file: %s", err)
|
|
}
|
|
defer f.Close()
|
|
added := 0
|
|
for {
|
|
b := make([]byte, dht.CompactIPv4NodeInfoLen)
|
|
_, err := io.ReadFull(f, b)
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
if err != nil {
|
|
return fmt.Errorf("error reading table file: %s", err)
|
|
}
|
|
var ni dht.NodeInfo
|
|
err = ni.UnmarshalCompactIPv4(b)
|
|
if err != nil {
|
|
return fmt.Errorf("error unmarshaling compact node info: %s", err)
|
|
}
|
|
s.AddNode(ni)
|
|
added++
|
|
}
|
|
log.Printf("loaded %d nodes from table file", added)
|
|
return nil
|
|
}
|
|
|
|
func init() {
|
|
log.SetFlags(log.LstdFlags | log.Lshortfile)
|
|
flag.Parse()
|
|
var err error
|
|
s, err = dht.NewServer(&dht.ServerConfig{
|
|
Addr: *serveAddr,
|
|
})
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
err = loadTable()
|
|
if err != nil {
|
|
log.Fatalf("error loading table: %s", err)
|
|
}
|
|
log.Printf("dht server on %s, ID is %q", s.Addr(), s.ID())
|
|
setupSignals()
|
|
}
|
|
|
|
func saveTable() error {
|
|
goodNodes := s.Nodes()
|
|
if *tableFileName == "" {
|
|
if len(goodNodes) != 0 {
|
|
log.Printf("discarding %d good nodes!", len(goodNodes))
|
|
}
|
|
return nil
|
|
}
|
|
f, err := os.OpenFile(*tableFileName, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
|
|
if err != nil {
|
|
return fmt.Errorf("error opening table file: %s", err)
|
|
}
|
|
defer f.Close()
|
|
for _, nodeInfo := range goodNodes {
|
|
var b [dht.CompactIPv4NodeInfoLen]byte
|
|
err := nodeInfo.PutCompact(b[:])
|
|
if err != nil {
|
|
return fmt.Errorf("error compacting node info: %s", err)
|
|
}
|
|
_, err = f.Write(b[:])
|
|
if err != nil {
|
|
return fmt.Errorf("error writing compact node info: %s", err)
|
|
}
|
|
}
|
|
log.Printf("saved %d nodes to table file", len(goodNodes))
|
|
return nil
|
|
}
|
|
|
|
func setupSignals() {
|
|
ch := make(chan os.Signal)
|
|
signal.Notify(ch)
|
|
go func() {
|
|
<-ch
|
|
s.Close()
|
|
}()
|
|
}
|
|
|
|
func main() {
|
|
select {}
|
|
// if err := saveTable(); err != nil {
|
|
// log.Printf("error saving node table: %s", err)
|
|
// }
|
|
}
|