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main.go
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main.go
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package main
import (
"context"
"log"
"net"
"net/http"
"os"
"os/signal"
_ "github.com/anacrolix/envpprof"
"github.com/anacrolix/tagflag"
"github.com/azber/dht/v2"
)
var (
flags = struct {
TableFile string `help:"name of file for storing node info"`
Addr string `help:"local UDP address"`
NoBootstrap bool
}{
Addr: ":0",
}
s *dht.Server
)
func loadTable() (err error) {
added, err := s.AddNodesFromFile(flags.TableFile)
log.Printf("loaded %d nodes from table file", added)
return
}
func saveTable() error {
return dht.WriteNodesToFile(s.Nodes(), flags.TableFile)
}
func main() {
log.SetFlags(log.LstdFlags | log.Lshortfile)
tagflag.Parse(&flags)
conn, err := net.ListenPacket("udp", flags.Addr)
if err != nil {
log.Fatal(err)
}
defer conn.Close()
s, err = dht.NewServer(&dht.ServerConfig{
Conn: conn,
StartingNodes: func() ([]dht.Addr, error) { return dht.GlobalBootstrapAddrs("udp") },
})
if err != nil {
log.Fatal(err)
}
http.HandleFunc("/debug/dht", func(w http.ResponseWriter, r *http.Request) {
s.WriteStatus(w)
})
if flags.TableFile != "" {
err = loadTable()
if err != nil {
log.Fatalf("error loading table: %s", err)
}
}
log.Printf("dht server on %s, ID is %x", s.Addr(), s.ID())
ctx, cancel := context.WithCancel(context.Background())
go func() {
ch := make(chan os.Signal, 1)
signal.Notify(ch)
<-ch
cancel()
}()
if !flags.NoBootstrap {
go func() {
if tried, err := s.Bootstrap(); err != nil {
log.Printf("error bootstrapping: %s", err)
} else {
log.Printf("finished bootstrapping: crawled %#v addrs", tried)
}
}()
}
<-ctx.Done()
s.Close()
if flags.TableFile != "" {
if err := saveTable(); err != nil {
log.Printf("error saving node table: %s", err)
}
}
}