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authorLewis Marshall <lewis@lmars.net>2017-09-25 16:08:07 +0800
committerFelix Lange <fjl@users.noreply.github.com>2017-09-25 16:08:07 +0800
commit9feec51e2dd754819e5c730ac5985d28d57adb48 (patch)
tree32b07b659cf7d0b4c1a7da67b5c49daf7a10a9d3 /cmd
parent673007d7aed1d2678ea3277eceb7b55dc29cf092 (diff)
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p2p: add network simulation framework (#14982)
This commit introduces a network simulation framework which can be used to run simulated networks of devp2p nodes. The intention is to use this for testing protocols, performing benchmarks and visualising emergent network behaviour.
Diffstat (limited to 'cmd')
-rw-r--r--cmd/p2psim/main.go414
1 files changed, 414 insertions, 0 deletions
diff --git a/cmd/p2psim/main.go b/cmd/p2psim/main.go
new file mode 100644
index 000000000..56b74d135
--- /dev/null
+++ b/cmd/p2psim/main.go
@@ -0,0 +1,414 @@
+// 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/discover"
+ "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",
+ },
+ },
+ },
+ },
+ },
+ }
+ app.Run(os.Args)
+}
+
+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.NodeConfig{
+ Name: ctx.String("name"),
+ }
+ if key := ctx.String("key"); key != "" {
+ privKey, err := crypto.HexToECDSA(key)
+ if err != nil {
+ return err
+ }
+ config.ID = discover.PubkeyID(&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
+ }
+ }
+}