prysm-pulse/beacon-chain/node/clear_db.go

package node

import (
	"bufio"
	"fmt"
	"os"
	"strings"

	"github.com/prysmaticlabs/prysm/beacon-chain/db"
)

func confirmDelete(d db.Database, path string, force bool) (db.Database, error) {
	var clearDB bool
	var err error
	reader := bufio.NewReader(os.Stdin)
	if force {
		clearDB = true
	} else {
		log.Warn("This will delete your beacon chain data base stored in your data directory. " +
			"Your database backups will not be removed - do you want to proceed? (Y/N)")

		for {
			fmt.Print(">> ")

			line, _, err := reader.ReadLine()
			if err != nil {
				return nil, err
			}
			trimmedLine := strings.TrimSpace(string(line))
			lineInput := strings.ToUpper(trimmedLine)
			if lineInput != "Y" && lineInput != "N" {
				log.Errorf("Invalid option of %s chosen, enter Y/N", line)
				continue
			}
			if lineInput == "Y" {
				clearDB = true
				break
			}
			log.Info("Not deleting chain database, the db will be initialized" +
				" with the current data directory.")
			break
		}
	}

	if clearDB {
		log.Warning("Removing database")
		if err := d.ClearDB(); err != nil {
			return nil, err
		}
		d, err = db.NewDB(path)
		if err != nil {
			return nil, err
		}
	}
	return d, nil
}