/
anvil.go
82 lines (69 loc) · 1.95 KB
/
anvil.go
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// Copyright (c) Gabriel de Quadros Ligneul
// SPDX-License-Identifier: Apache-2.0 (see LICENSE)
package devnet
import (
"context"
_ "embed"
"fmt"
"log/slog"
"os"
"path"
"github.com/gligneul/nonodo/internal/supervisor"
)
// Default port for the Ethereum node.
const AnvilDefaultPort = 8545
// Generate the devnet state and embed it in the Go binary.
//
//go:generate go run ./gen-devnet-state
//go:embed anvil_state.json
var devnetState []byte
const stateFileName = "anvil_state.json"
const anvilCommand = "anvil"
// Start the anvil process in the host machine.
type AnvilWorker struct {
Port int
Verbose bool
}
func (w AnvilWorker) String() string {
return anvilCommand
}
func (w AnvilWorker) Start(ctx context.Context, ready chan<- struct{}) error {
dir, err := makeStateTemp()
if err != nil {
return err
}
defer removeTemp(dir)
slog.Debug("anvil: created temp dir with state file", "dir", dir)
var server supervisor.ServerWorker
server.Name = anvilCommand
server.Command = anvilCommand
server.Port = w.Port
server.Args = append(server.Args, "--port", fmt.Sprint(w.Port))
server.Args = append(server.Args, "--load-state", path.Join(dir, stateFileName))
if !w.Verbose {
server.Args = append(server.Args, "--silent")
}
return server.Start(ctx, ready)
}
// Create a temporary directory with the state file in it.
// The directory should be removed by the callee.
func makeStateTemp() (string, error) {
tempDir, err := os.MkdirTemp("", "")
if err != nil {
return "", fmt.Errorf("anvil: failed to create temp dir: %w", err)
}
stateFile := path.Join(tempDir, stateFileName)
const permissions = 0644
err = os.WriteFile(stateFile, devnetState, permissions)
if err != nil {
return "", fmt.Errorf("anvil: failed to write state file: %w", err)
}
return tempDir, nil
}
// Delete the temporary directory.
func removeTemp(dir string) {
err := os.RemoveAll(dir)
if err != nil {
slog.Warn("anvil: failed to remove temp file", "error", err)
}
}