124 lines
2.9 KiB
Go
124 lines
2.9 KiB
Go
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// Copyright 2019 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package main
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import (
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"fmt"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/p2p/discover"
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"gopkg.in/urfave/cli.v1"
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)
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var (
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discv5Command = cli.Command{
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Name: "discv5",
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Usage: "Node Discovery v5 tools",
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Subcommands: []cli.Command{
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discv5PingCommand,
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discv5ResolveCommand,
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discv5CrawlCommand,
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discv5ListenCommand,
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},
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}
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discv5PingCommand = cli.Command{
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Name: "ping",
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Usage: "Sends ping to a node",
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Action: discv5Ping,
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}
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discv5ResolveCommand = cli.Command{
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Name: "resolve",
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Usage: "Finds a node in the DHT",
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Action: discv5Resolve,
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Flags: []cli.Flag{bootnodesFlag},
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}
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discv5CrawlCommand = cli.Command{
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Name: "crawl",
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Usage: "Updates a nodes.json file with random nodes found in the DHT",
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Action: discv5Crawl,
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Flags: []cli.Flag{bootnodesFlag, crawlTimeoutFlag},
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}
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discv5ListenCommand = cli.Command{
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Name: "listen",
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Usage: "Runs a node",
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Action: discv5Listen,
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Flags: []cli.Flag{
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bootnodesFlag,
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nodekeyFlag,
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nodedbFlag,
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listenAddrFlag,
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},
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}
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)
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func discv5Ping(ctx *cli.Context) error {
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n := getNodeArg(ctx)
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disc := startV5(ctx)
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defer disc.Close()
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fmt.Println(disc.Ping(n))
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return nil
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}
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func discv5Resolve(ctx *cli.Context) error {
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n := getNodeArg(ctx)
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disc := startV5(ctx)
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defer disc.Close()
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fmt.Println(disc.Resolve(n))
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return nil
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}
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func discv5Crawl(ctx *cli.Context) error {
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if ctx.NArg() < 1 {
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return fmt.Errorf("need nodes file as argument")
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}
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nodesFile := ctx.Args().First()
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var inputSet nodeSet
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if common.FileExist(nodesFile) {
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inputSet = loadNodesJSON(nodesFile)
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}
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disc := startV5(ctx)
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defer disc.Close()
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c := newCrawler(inputSet, disc, disc.RandomNodes())
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c.revalidateInterval = 10 * time.Minute
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output := c.run(ctx.Duration(crawlTimeoutFlag.Name))
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writeNodesJSON(nodesFile, output)
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return nil
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}
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func discv5Listen(ctx *cli.Context) error {
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disc := startV5(ctx)
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defer disc.Close()
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fmt.Println(disc.Self())
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select {}
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}
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// startV5 starts an ephemeral discovery v5 node.
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func startV5(ctx *cli.Context) *discover.UDPv5 {
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ln, config := makeDiscoveryConfig(ctx)
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socket := listen(ln, ctx.String(listenAddrFlag.Name))
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disc, err := discover.ListenV5(socket, ln, config)
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if err != nil {
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exit(err)
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}
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return disc
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}
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