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