Official Go implementation of the Ethereum protocol
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go-ethereum/cmd/devp2p/discv5cmd.go

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// Copyright 2020 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/>.
package main
import (
"errors"
"fmt"
"time"
"github.com/ethereum/go-ethereum/cmd/devp2p/internal/v5test"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/internal/flags"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/urfave/cli/v2"
)
var (
discv5Command = &cli.Command{
Name: "discv5",
Usage: "Node Discovery v5 tools",
Subcommands: []*cli.Command{
discv5PingCommand,
discv5ResolveCommand,
discv5CrawlCommand,
discv5TestCommand,
discv5ListenCommand,
},
}
discv5PingCommand = &cli.Command{
Name: "ping",
Usage: "Sends ping to a node",
Action: discv5Ping,
Flags: discoveryNodeFlags,
}
discv5ResolveCommand = &cli.Command{
Name: "resolve",
Usage: "Finds a node in the DHT",
Action: discv5Resolve,
Flags: discoveryNodeFlags,
}
discv5CrawlCommand = &cli.Command{
Name: "crawl",
Usage: "Updates a nodes.json file with random nodes found in the DHT",
Action: discv5Crawl,
Flags: flags.Merge(discoveryNodeFlags, []cli.Flag{
crawlTimeoutFlag,
}),
}
discv5TestCommand = &cli.Command{
Name: "test",
Usage: "Runs protocol tests against a node",
Action: discv5Test,
Flags: []cli.Flag{
testPatternFlag,
testTAPFlag,
testListen1Flag,
testListen2Flag,
},
}
discv5ListenCommand = &cli.Command{
Name: "listen",
Usage: "Runs a node",
Action: discv5Listen,
Flags: discoveryNodeFlags,
}
)
func discv5Ping(ctx *cli.Context) error {
n := getNodeArg(ctx)
disc, _ := startV5(ctx)
defer disc.Close()
fmt.Println(disc.Ping(n))
return nil
}
func discv5Resolve(ctx *cli.Context) error {
n := getNodeArg(ctx)
disc, _ := startV5(ctx)
defer disc.Close()
fmt.Println(disc.Resolve(n))
return nil
}
func discv5Crawl(ctx *cli.Context) error {
if ctx.NArg() < 1 {
return errors.New("need nodes file as argument")
}
nodesFile := ctx.Args().First()
inputSet := make(nodeSet)
if common.FileExist(nodesFile) {
inputSet = loadNodesJSON(nodesFile)
}
disc, config := startV5(ctx)
defer disc.Close()
c, err := newCrawler(inputSet, config.Bootnodes, disc, disc.RandomNodes())
if err != nil {
return err
}
c.revalidateInterval = 10 * time.Minute
output := c.run(ctx.Duration(crawlTimeoutFlag.Name), ctx.Int(crawlParallelismFlag.Name))
writeNodesJSON(nodesFile, output)
return nil
}
// discv5Test runs the protocol test suite.
func discv5Test(ctx *cli.Context) error {
suite := &v5test.Suite{
Dest: getNodeArg(ctx),
Listen1: ctx.String(testListen1Flag.Name),
Listen2: ctx.String(testListen2Flag.Name),
}
return runTests(ctx, suite.AllTests())
}
func discv5Listen(ctx *cli.Context) error {
disc, _ := startV5(ctx)
defer disc.Close()
fmt.Println(disc.Self())
select {}
}
// startV5 starts an ephemeral discovery v5 node.
func startV5(ctx *cli.Context) (*discover.UDPv5, discover.Config) {
ln, config := makeDiscoveryConfig(ctx)
socket := listen(ctx, ln)
disc, err := discover.ListenV5(socket, ln, config)
if err != nil {
exit(err)
}
return disc, config
}