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// Copyright 2016 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
// bootnode runs a bootstrap node for the Ethereum Discovery Protocol.
package main
import (
"flag"
"fmt"
"math/rand"
"strconv"
"time"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/ethereum/go-ethereum/p2p/nat"
)
func main() {
var (
listenPort = flag.Int("addr", 31000, "beginning of listening port range")
natdesc = flag.String("nat", "none", "port mapping mechanism (any|none|upnp|pmp|extip:<IP>)")
count = flag.Int("count", 1, "number of v5 topic discovery test nodes (adds default bootnodes to form a test network)")
regtopic = flag.String("reg", "", "topic to register on the network")
looktopic = flag.String("search", "", "topic to search on the network")
)
flag.Var(glog.GetVerbosity(), "verbosity", "log verbosity (0-9)")
flag.Var(glog.GetVModule(), "vmodule", "log verbosity pattern")
glog.SetToStderr(true)
flag.Parse()
natm, err := nat.Parse(*natdesc)
if err != nil {
utils.Fatalf("-nat: %v", err)
}
for i := 0; i < *count; i++ {
listenAddr := ":" + strconv.Itoa(*listenPort+i)
nodeKey, err := crypto.GenerateKey()
if err != nil {
utils.Fatalf("could not generate key: %v", err)
}
if net, err := discv5.ListenUDP(nodeKey, listenAddr, natm, ""); err != nil {
utils.Fatalf("%v", err)
} else {
if err := net.SetFallbackNodes(discv5.BootNodes); err != nil {
utils.Fatalf("%v", err)
}
go func() {
if *looktopic == "" {
for i := 0; i < 20; i++ {
time.Sleep(time.Millisecond * time.Duration(2000+rand.Intn(2001)))
net.BucketFill()
}
}
switch {
case *regtopic != "":
// register topic
fmt.Println("Starting topic register")
stop := make(chan struct{})
net.RegisterTopic(discv5.Topic(*regtopic), stop)
case *looktopic != "":
// search topic
fmt.Println("Starting topic search")
stop := make(chan struct{})
found := make(chan string, 100)
go net.SearchTopic(discv5.Topic(*looktopic), stop, found)
for s := range found {
fmt.Println(time.Now(), s)
}
default:
// just keep doing lookups
for {
time.Sleep(time.Millisecond * time.Duration(40000+rand.Intn(40001)))
net.BucketFill()
}
}
}()
}
fmt.Printf("Started test node #%d with public key %v\n", i, discv5.PubkeyID(&nodeKey.PublicKey))
}
select {}
}
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