Find offset value for ancient pruner

go.mod

module go-test

go 1.22.4

require github.com/ethereum/go-ethereum v1.14.5

require (
	github.com/DataDog/zstd v1.4.5 // indirect
	github.com/StackExchange/wmi v1.2.1 // indirect
	github.com/beorn7/perks v1.0.1 // indirect
	github.com/bits-and-blooms/bitset v1.10.0 // indirect
	github.com/btcsuite/btcd/btcec/v2 v2.2.0 // indirect
	github.com/cespare/xxhash/v2 v2.3.0 // indirect
	github.com/cockroachdb/errors v1.11.1 // indirect
	github.com/cockroachdb/logtags v0.0.0-20230118201751-21c54148d20b // indirect
	github.com/cockroachdb/pebble v1.1.0 // indirect
	github.com/cockroachdb/redact v1.1.5 // indirect
	github.com/cockroachdb/tokenbucket v0.0.0-20230807174530-cc333fc44b06 // indirect
	github.com/consensys/bavard v0.1.13 // indirect
	github.com/consensys/gnark-crypto v0.12.1 // indirect
	github.com/crate-crypto/go-kzg-4844 v1.0.0 // indirect
	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
	github.com/ethereum/c-kzg-4844 v1.0.0 // indirect
	github.com/getsentry/sentry-go v0.18.0 // indirect
	github.com/go-ole/go-ole v1.3.0 // indirect
	github.com/gofrs/flock v0.8.1 // indirect
	github.com/gogo/protobuf v1.3.2 // indirect
	github.com/golang/protobuf v1.5.4 // indirect
	github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb // indirect
	github.com/holiman/uint256 v1.2.4 // indirect
	github.com/klauspost/compress v1.15.15 // indirect
	github.com/kr/pretty v0.3.1 // indirect
	github.com/kr/text v0.2.0 // indirect
	github.com/mattn/go-runewidth v0.0.13 // indirect
	github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 // indirect
	github.com/mmcloughlin/addchain v0.4.0 // indirect
	github.com/olekukonko/tablewriter v0.0.5 // indirect
	github.com/pkg/errors v0.9.1 // indirect
	github.com/prometheus/client_golang v1.12.0 // indirect
	github.com/prometheus/client_model v0.2.1-0.20210607210712-147c58e9608a // indirect
	github.com/prometheus/common v0.32.1 // indirect
	github.com/prometheus/procfs v0.7.3 // indirect
	github.com/rivo/uniseg v0.2.0 // indirect
	github.com/rogpeppe/go-internal v1.9.0 // indirect
	github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible // indirect
	github.com/supranational/blst v0.3.11 // indirect
	github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7 // indirect
	github.com/tklauser/go-sysconf v0.3.12 // indirect
	github.com/tklauser/numcpus v0.6.1 // indirect
	golang.org/x/crypto v0.22.0 // indirect
	golang.org/x/exp v0.0.0-20231110203233-9a3e6036ecaa // indirect
	golang.org/x/sync v0.7.0 // indirect
	golang.org/x/sys v0.20.0 // indirect
	golang.org/x/text v0.14.0 // indirect
	google.golang.org/protobuf v1.33.0 // indirect
	rsc.io/tmplfunc v0.0.3 // indirect
)

main.go

package main

import (
	"fmt"
	"log"
	"math/big"

	"github.com/ethereum/go-ethereum/core/rawdb"
	"github.com/ethereum/go-ethereum/ethdb"
)

var (
	// offset of the new updated ancientDB.
	offsetOfCurrentAncientFreezer = []byte("offsetOfCurrentAncientFreezer")

	// offset of the ancientDB before updated version.
	offsetOfLastAncientFreezer = []byte("offsetOfLastAncientFreezer")
)

func main() {
	path := "/opt/data"
	fmt.Println("Finding offset in leveldb, path:", path)

	db, err := rawdb.NewLevelDBDatabase(path, 1024, 2000, "", true)
	if err != nil {
		log.Fatalf("Error opening db: %v", err)
	}
	defer db.Close()

	fmt.Println("offsetOfCurrentAncientFreezer:", ReadOffsetOfCurrentAncientFreezer(db))
	fmt.Println("offsetOfLastAncientFreezer:", ReadOffsetOfLastAncientFreezer(db))
}

// ReadOffsetOfCurrentAncientFreezer reads the offset of current ancient freezer
func ReadOffsetOfCurrentAncientFreezer(db ethdb.Database) uint64 {
	offset, err := db.Get(offsetOfCurrentAncientFreezer)
	if err != nil {
		log.Println("Error reading offsetOfCurrentAncientFreezer:", err)
	}
	if offset == nil {
		return 0
	}

	return new(big.Int).SetBytes(offset).Uint64()
}

// ReadOffsetOfLastAncientFreezer reads the offset of last pruned ancient freezer
func ReadOffsetOfLastAncientFreezer(db ethdb.Database) uint64 {
	offset, err := db.Get(offsetOfLastAncientFreezer)
	if err != nil {
		log.Println("Error reading offsetOfCurrentAncientFreezer:", err)
	}
	if offset == nil {
		return 0
	}

	return new(big.Int).SetBytes(offset).Uint64()
}