• Felix Lange's avatar
    all: new p2p node representation (#17643) · 30cd5c18
    Felix Lange authored
    Package p2p/enode provides a generalized representation of p2p nodes
    which can contain arbitrary information in key/value pairs. It is also
    the new home for the node database. The "v4" identity scheme is also
    moved here from p2p/enr to remove the dependency on Ethereum crypto from
    that package.
    
    Record signature handling is changed significantly. The identity scheme
    registry is removed and acceptable schemes must be passed to any method
    that needs identity. This means records must now be validated explicitly
    after decoding.
    
    The enode API is designed to make signature handling easy and safe: most
    APIs around the codebase work with enode.Node, which is a wrapper around
    a valid record. Going from enr.Record to enode.Node requires a valid
    signature.
    
    * p2p/discover: port to p2p/enode
    
    This ports the discovery code to the new node representation in
    p2p/enode. The wire protocol is unchanged, this can be considered a
    refactoring change. The Kademlia table can now deal with nodes using an
    arbitrary identity scheme. This requires a few incompatible API changes:
    
      - Table.Lookup is not available anymore. It used to take a public key
        as argument because v4 protocol requires one. Its replacement is
        LookupRandom.
      - Table.Resolve takes *enode.Node instead of NodeID. This is also for
        v4 protocol compatibility because nodes cannot be looked up by ID
        alone.
      - Types Node and NodeID are gone. Further commits in the series will be
        fixes all over the the codebase to deal with those removals.
    
    * p2p: port to p2p/enode and discovery changes
    
    This adapts package p2p to the changes in p2p/discover. All uses of
    discover.Node and discover.NodeID are replaced by their equivalents from
    p2p/enode.
    
    New API is added to retrieve the enode.Node instance of a peer. The
    behavior of Server.Self with discovery disabled is improved. It now
    tries much harder to report a working IP address, falling back to
    127.0.0.1 if no suitable address can be determined through other means.
    These changes were needed for tests of other packages later in the
    series.
    
    * p2p/simulations, p2p/testing: port to p2p/enode
    
    No surprises here, mostly replacements of discover.Node, discover.NodeID
    with their new equivalents. The 'interesting' API changes are:
    
     - testing.ProtocolSession tracks complete nodes, not just their IDs.
     - adapters.NodeConfig has a new method to create a complete node.
    
    These changes were needed to make swarm tests work.
    
    Note that the NodeID change makes the code incompatible with old
    simulation snapshots.
    
    * whisper/whisperv5, whisper/whisperv6: port to p2p/enode
    
    This port was easy because whisper uses []byte for node IDs and
    URL strings in the API.
    
    * eth: port to p2p/enode
    
    Again, easy to port because eth uses strings for node IDs and doesn't
    care about node information in any way.
    
    * les: port to p2p/enode
    
    Apart from replacing discover.NodeID with enode.ID, most changes are in
    the server pool code. It now deals with complete nodes instead
    of (Pubkey, IP, Port) triples. The database format is unchanged for now,
    but we should probably change it to use the node database later.
    
    * node: port to p2p/enode
    
    This change simply replaces discover.Node and discover.NodeID with their
    new equivalents.
    
    * swarm/network: port to p2p/enode
    
    Swarm has its own node address representation, BzzAddr, containing both
    an overlay address (the hash of a secp256k1 public key) and an underlay
    address (enode:// URL).
    
    There are no changes to the BzzAddr format in this commit, but certain
    operations such as creating a BzzAddr from a node ID are now impossible
    because node IDs aren't public keys anymore.
    
    Most swarm-related changes in the series remove uses of
    NewAddrFromNodeID, replacing it with NewAddr which takes a complete node
    as argument. ToOverlayAddr is removed because we can just use the node
    ID directly.
    Unverified
    30cd5c18
main.go 10.2 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432
// Copyright 2017 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/>.

// p2psim provides a command-line client for a simulation HTTP API.
//
// Here is an example of creating a 2 node network with the first node
// connected to the second:
//
//     $ p2psim node create
//     Created node01
//
//     $ p2psim node start node01
//     Started node01
//
//     $ p2psim node create
//     Created node02
//
//     $ p2psim node start node02
//     Started node02
//
//     $ p2psim node connect node01 node02
//     Connected node01 to node02
//
package main

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"os"
	"strings"
	"text/tabwriter"

	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/p2p"
	"github.com/ethereum/go-ethereum/p2p/enode"
	"github.com/ethereum/go-ethereum/p2p/simulations"
	"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
	"github.com/ethereum/go-ethereum/rpc"
	"gopkg.in/urfave/cli.v1"
)

var client *simulations.Client

func main() {
	app := cli.NewApp()
	app.Usage = "devp2p simulation command-line client"
	app.Flags = []cli.Flag{
		cli.StringFlag{
			Name:   "api",
			Value:  "http://localhost:8888",
			Usage:  "simulation API URL",
			EnvVar: "P2PSIM_API_URL",
		},
	}
	app.Before = func(ctx *cli.Context) error {
		client = simulations.NewClient(ctx.GlobalString("api"))
		return nil
	}
	app.Commands = []cli.Command{
		{
			Name:   "show",
			Usage:  "show network information",
			Action: showNetwork,
		},
		{
			Name:   "events",
			Usage:  "stream network events",
			Action: streamNetwork,
			Flags: []cli.Flag{
				cli.BoolFlag{
					Name:  "current",
					Usage: "get existing nodes and conns first",
				},
				cli.StringFlag{
					Name:  "filter",
					Value: "",
					Usage: "message filter",
				},
			},
		},
		{
			Name:   "snapshot",
			Usage:  "create a network snapshot to stdout",
			Action: createSnapshot,
		},
		{
			Name:   "load",
			Usage:  "load a network snapshot from stdin",
			Action: loadSnapshot,
		},
		{
			Name:   "node",
			Usage:  "manage simulation nodes",
			Action: listNodes,
			Subcommands: []cli.Command{
				{
					Name:   "list",
					Usage:  "list nodes",
					Action: listNodes,
				},
				{
					Name:   "create",
					Usage:  "create a node",
					Action: createNode,
					Flags: []cli.Flag{
						cli.StringFlag{
							Name:  "name",
							Value: "",
							Usage: "node name",
						},
						cli.StringFlag{
							Name:  "services",
							Value: "",
							Usage: "node services (comma separated)",
						},
						cli.StringFlag{
							Name:  "key",
							Value: "",
							Usage: "node private key (hex encoded)",
						},
					},
				},
				{
					Name:      "show",
					ArgsUsage: "<node>",
					Usage:     "show node information",
					Action:    showNode,
				},
				{
					Name:      "start",
					ArgsUsage: "<node>",
					Usage:     "start a node",
					Action:    startNode,
				},
				{
					Name:      "stop",
					ArgsUsage: "<node>",
					Usage:     "stop a node",
					Action:    stopNode,
				},
				{
					Name:      "connect",
					ArgsUsage: "<node> <peer>",
					Usage:     "connect a node to a peer node",
					Action:    connectNode,
				},
				{
					Name:      "disconnect",
					ArgsUsage: "<node> <peer>",
					Usage:     "disconnect a node from a peer node",
					Action:    disconnectNode,
				},
				{
					Name:      "rpc",
					ArgsUsage: "<node> <method> [<args>]",
					Usage:     "call a node RPC method",
					Action:    rpcNode,
					Flags: []cli.Flag{
						cli.BoolFlag{
							Name:  "subscribe",
							Usage: "method is a subscription",
						},
					},
				},
			},
		},
	}
	if err := app.Run(os.Args); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}

func showNetwork(ctx *cli.Context) error {
	if len(ctx.Args()) != 0 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	network, err := client.GetNetwork()
	if err != nil {
		return err
	}
	w := tabwriter.NewWriter(ctx.App.Writer, 1, 2, 2, ' ', 0)
	defer w.Flush()
	fmt.Fprintf(w, "NODES\t%d\n", len(network.Nodes))
	fmt.Fprintf(w, "CONNS\t%d\n", len(network.Conns))
	return nil
}

func streamNetwork(ctx *cli.Context) error {
	if len(ctx.Args()) != 0 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	events := make(chan *simulations.Event)
	sub, err := client.SubscribeNetwork(events, simulations.SubscribeOpts{
		Current: ctx.Bool("current"),
		Filter:  ctx.String("filter"),
	})
	if err != nil {
		return err
	}
	defer sub.Unsubscribe()
	enc := json.NewEncoder(ctx.App.Writer)
	for {
		select {
		case event := <-events:
			if err := enc.Encode(event); err != nil {
				return err
			}
		case err := <-sub.Err():
			return err
		}
	}
}

func createSnapshot(ctx *cli.Context) error {
	if len(ctx.Args()) != 0 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	snap, err := client.CreateSnapshot()
	if err != nil {
		return err
	}
	return json.NewEncoder(os.Stdout).Encode(snap)
}

func loadSnapshot(ctx *cli.Context) error {
	if len(ctx.Args()) != 0 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	snap := &simulations.Snapshot{}
	if err := json.NewDecoder(os.Stdin).Decode(snap); err != nil {
		return err
	}
	return client.LoadSnapshot(snap)
}

func listNodes(ctx *cli.Context) error {
	if len(ctx.Args()) != 0 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	nodes, err := client.GetNodes()
	if err != nil {
		return err
	}
	w := tabwriter.NewWriter(ctx.App.Writer, 1, 2, 2, ' ', 0)
	defer w.Flush()
	fmt.Fprintf(w, "NAME\tPROTOCOLS\tID\n")
	for _, node := range nodes {
		fmt.Fprintf(w, "%s\t%s\t%s\n", node.Name, strings.Join(protocolList(node), ","), node.ID)
	}
	return nil
}

func protocolList(node *p2p.NodeInfo) []string {
	protos := make([]string, 0, len(node.Protocols))
	for name := range node.Protocols {
		protos = append(protos, name)
	}
	return protos
}

func createNode(ctx *cli.Context) error {
	if len(ctx.Args()) != 0 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	config := adapters.RandomNodeConfig()
	config.Name = ctx.String("name")
	if key := ctx.String("key"); key != "" {
		privKey, err := crypto.HexToECDSA(key)
		if err != nil {
			return err
		}
		config.ID = enode.PubkeyToIDV4(&privKey.PublicKey)
		config.PrivateKey = privKey
	}
	if services := ctx.String("services"); services != "" {
		config.Services = strings.Split(services, ",")
	}
	node, err := client.CreateNode(config)
	if err != nil {
		return err
	}
	fmt.Fprintln(ctx.App.Writer, "Created", node.Name)
	return nil
}

func showNode(ctx *cli.Context) error {
	args := ctx.Args()
	if len(args) != 1 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	nodeName := args[0]
	node, err := client.GetNode(nodeName)
	if err != nil {
		return err
	}
	w := tabwriter.NewWriter(ctx.App.Writer, 1, 2, 2, ' ', 0)
	defer w.Flush()
	fmt.Fprintf(w, "NAME\t%s\n", node.Name)
	fmt.Fprintf(w, "PROTOCOLS\t%s\n", strings.Join(protocolList(node), ","))
	fmt.Fprintf(w, "ID\t%s\n", node.ID)
	fmt.Fprintf(w, "ENODE\t%s\n", node.Enode)
	for name, proto := range node.Protocols {
		fmt.Fprintln(w)
		fmt.Fprintf(w, "--- PROTOCOL INFO: %s\n", name)
		fmt.Fprintf(w, "%v\n", proto)
		fmt.Fprintf(w, "---\n")
	}
	return nil
}

func startNode(ctx *cli.Context) error {
	args := ctx.Args()
	if len(args) != 1 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	nodeName := args[0]
	if err := client.StartNode(nodeName); err != nil {
		return err
	}
	fmt.Fprintln(ctx.App.Writer, "Started", nodeName)
	return nil
}

func stopNode(ctx *cli.Context) error {
	args := ctx.Args()
	if len(args) != 1 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	nodeName := args[0]
	if err := client.StopNode(nodeName); err != nil {
		return err
	}
	fmt.Fprintln(ctx.App.Writer, "Stopped", nodeName)
	return nil
}

func connectNode(ctx *cli.Context) error {
	args := ctx.Args()
	if len(args) != 2 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	nodeName := args[0]
	peerName := args[1]
	if err := client.ConnectNode(nodeName, peerName); err != nil {
		return err
	}
	fmt.Fprintln(ctx.App.Writer, "Connected", nodeName, "to", peerName)
	return nil
}

func disconnectNode(ctx *cli.Context) error {
	args := ctx.Args()
	if len(args) != 2 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	nodeName := args[0]
	peerName := args[1]
	if err := client.DisconnectNode(nodeName, peerName); err != nil {
		return err
	}
	fmt.Fprintln(ctx.App.Writer, "Disconnected", nodeName, "from", peerName)
	return nil
}

func rpcNode(ctx *cli.Context) error {
	args := ctx.Args()
	if len(args) < 2 {
		return cli.ShowCommandHelp(ctx, ctx.Command.Name)
	}
	nodeName := args[0]
	method := args[1]
	rpcClient, err := client.RPCClient(context.Background(), nodeName)
	if err != nil {
		return err
	}
	if ctx.Bool("subscribe") {
		return rpcSubscribe(rpcClient, ctx.App.Writer, method, args[3:]...)
	}
	var result interface{}
	params := make([]interface{}, len(args[3:]))
	for i, v := range args[3:] {
		params[i] = v
	}
	if err := rpcClient.Call(&result, method, params...); err != nil {
		return err
	}
	return json.NewEncoder(ctx.App.Writer).Encode(result)
}

func rpcSubscribe(client *rpc.Client, out io.Writer, method string, args ...string) error {
	parts := strings.SplitN(method, "_", 2)
	namespace := parts[0]
	method = parts[1]
	ch := make(chan interface{})
	subArgs := make([]interface{}, len(args)+1)
	subArgs[0] = method
	for i, v := range args {
		subArgs[i+1] = v
	}
	sub, err := client.Subscribe(context.Background(), namespace, ch, subArgs...)
	if err != nil {
		return err
	}
	defer sub.Unsubscribe()
	enc := json.NewEncoder(out)
	for {
		select {
		case v := <-ch:
			if err := enc.Encode(v); err != nil {
				return err
			}
		case err := <-sub.Err():
			return err
		}
	}
}