Official Go implementation of the Ethereum protocol
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go-ethereum/cmd/geth/consolecmd.go

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5.7 KiB

// 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/>.
package main
import (
"fmt"
"strings"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/console"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/rpc"
"github.com/urfave/cli/v2"
)
var (
consoleFlags = []cli.Flag{utils.JSpathFlag, utils.ExecFlag, utils.PreloadJSFlag}
consoleCommand = &cli.Command{
Action: localConsole,
Name: "console",
Usage: "Start an interactive JavaScript environment",
Flags: utils.GroupFlags(nodeFlags, rpcFlags, consoleFlags),
Description: `
The Geth console is an interactive shell for the JavaScript runtime environment
which exposes a node admin interface as well as the Ðapp JavaScript API.
See https://geth.ethereum.org/docs/interface/javascript-console.`,
}
attachCommand = &cli.Command{
Action: remoteConsole,
Name: "attach",
Usage: "Start an interactive JavaScript environment (connect to node)",
ArgsUsage: "[endpoint]",
Flags: utils.GroupFlags([]cli.Flag{utils.DataDirFlag}, consoleFlags),
Description: `
The Geth console is an interactive shell for the JavaScript runtime environment
which exposes a node admin interface as well as the Ðapp JavaScript API.
See https://geth.ethereum.org/docs/interface/javascript-console.
This command allows to open a console on a running geth node.`,
}
javascriptCommand = &cli.Command{
Action: ephemeralConsole,
Name: "js",
Usage: "(DEPRECATED) Execute the specified JavaScript files",
ArgsUsage: "<jsfile> [jsfile...]",
Flags: utils.GroupFlags(nodeFlags, consoleFlags),
Description: `
The JavaScript VM exposes a node admin interface as well as the Ðapp
JavaScript API. See https://geth.ethereum.org/docs/interface/javascript-console`,
}
)
// localConsole starts a new geth node, attaching a JavaScript console to it at the
// same time.
func localConsole(ctx *cli.Context) error {
// Create and start the node based on the CLI flags
prepare(ctx)
stack, backend := makeFullNode(ctx)
startNode(ctx, stack, backend, true)
defer stack.Close()
// Attach to the newly started node and create the JavaScript console.
client, err := stack.Attach()
if err != nil {
return fmt.Errorf("Failed to attach to the inproc geth: %v", err)
}
config := console.Config{
DataDir: utils.MakeDataDir(ctx),
DocRoot: ctx.String(utils.JSpathFlag.Name),
Client: client,
Preload: utils.MakeConsolePreloads(ctx),
}
console, err := console.New(config)
if err != nil {
return fmt.Errorf("Failed to start the JavaScript console: %v", err)
}
defer console.Stop(false)
// If only a short execution was requested, evaluate and return.
if script := ctx.String(utils.ExecFlag.Name); script != "" {
console.Evaluate(script)
return nil
}
// Track node shutdown and stop the console when it goes down.
// This happens when SIGTERM is sent to the process.
go func() {
stack.Wait()
console.StopInteractive()
}()
// Print the welcome screen and enter interactive mode.
console.Welcome()
console.Interactive()
return nil
}
// remoteConsole will connect to a remote geth instance, attaching a JavaScript
// console to it.
func remoteConsole(ctx *cli.Context) error {
if ctx.Args().Len() > 1 {
utils.Fatalf("invalid command-line: too many arguments")
}
endpoint := ctx.Args().First()
if endpoint == "" {
cfg := defaultNodeConfig()
utils.SetDataDir(ctx, &cfg)
endpoint = cfg.IPCEndpoint()
}
client, err := dialRPC(endpoint)
if err != nil {
utils.Fatalf("Unable to attach to remote geth: %v", err)
}
config := console.Config{
DataDir: utils.MakeDataDir(ctx),
DocRoot: ctx.String(utils.JSpathFlag.Name),
Client: client,
Preload: utils.MakeConsolePreloads(ctx),
}
console, err := console.New(config)
if err != nil {
utils.Fatalf("Failed to start the JavaScript console: %v", err)
}
defer console.Stop(false)
if script := ctx.String(utils.ExecFlag.Name); script != "" {
console.Evaluate(script)
return nil
}
// Otherwise print the welcome screen and enter interactive mode
console.Welcome()
console.Interactive()
return nil
}
// ephemeralConsole starts a new geth node, attaches an ephemeral JavaScript
// console to it, executes each of the files specified as arguments and tears
// everything down.
func ephemeralConsole(ctx *cli.Context) error {
var b strings.Builder
for _, file := range ctx.Args().Slice() {
b.Write([]byte(fmt.Sprintf("loadScript('%s');", file)))
}
utils.Fatalf(`The "js" command is deprecated. Please use the following instead:
geth --exec "%s" console`, b.String())
return nil
}
// dialRPC returns a RPC client which connects to the given endpoint.
// The check for empty endpoint implements the defaulting logic
// for "geth attach" with no argument.
func dialRPC(endpoint string) (*rpc.Client, error) {
if endpoint == "" {
endpoint = node.DefaultIPCEndpoint(clientIdentifier)
} else if strings.HasPrefix(endpoint, "rpc:") || strings.HasPrefix(endpoint, "ipc:") {
// Backwards compatibility with geth < 1.5 which required
// these prefixes.
endpoint = endpoint[4:]
}
return rpc.Dial(endpoint)
}