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migration.go
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migration.go
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// Copyright 2019 The Swarm Authors
// This file is part of the Swarm library.
//
// The Swarm library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Swarm library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Swarm library. If not, see <http://www.gnu.org/licenses/>.
package leveldb
import (
"errors"
"fmt"
"strings"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethersphere/bee/pkg/storage"
)
var (
errMissingCurrentSchema = errors.New("could not find current db schema")
errMissingTargetSchema = errors.New("could not find target db schema")
)
const (
dbSchemaKey = "statestore_schema"
dbSchemaGrace = "grace"
dbSchemaDrain = "drain"
dbSchemaCleanInterval = "clean-interval"
dbSchemaNoStamp = "no-stamp"
dbSchemaFlushBlock = "flushblock"
dbSchemaSwapAddr = "swapaddr"
dBSchemaKademliaMetrics = "kademlia-metrics"
dBSchemaBatchStore = "batchstore"
dBSchemaBatchStoreV2 = "batchstoreV2"
dBSchemaBatchStoreV3 = "batchstoreV3"
)
var (
dbSchemaCurrent = dBSchemaBatchStoreV3
)
type migration struct {
name string // name of the schema
fn func(s *Store) error // the migration function that needs to be performed in order to get to the current schema name
}
// schemaMigrations contains an ordered list of the database schemes, that is
// in order to run data migrations in the correct sequence
var schemaMigrations = []migration{
{name: dbSchemaGrace, fn: func(s *Store) error { return nil }},
{name: dbSchemaDrain, fn: migrateGrace},
{name: dbSchemaCleanInterval, fn: migrateGrace},
{name: dbSchemaNoStamp, fn: migrateStamp},
{name: dbSchemaFlushBlock, fn: migrateFB},
{name: dbSchemaSwapAddr, fn: migrateSwap},
{name: dBSchemaKademliaMetrics, fn: migrateKademliaMetrics},
{name: dBSchemaBatchStore, fn: migrateBatchstore},
{name: dBSchemaBatchStoreV2, fn: migrateBatchstoreV2},
{name: dBSchemaBatchStoreV3, fn: migrateBatchstore},
}
func migrateFB(s *Store) error {
collectedKeys, err := collectKeys(s, "blocklist-")
if err != nil {
return err
}
return deleteKeys(s, collectedKeys)
}
func migrateBatchstoreV2(s *Store) error {
for _, pfx := range []string{"batchstore_", "verified_overlay_"} {
collectedKeys, err := collectKeys(s, pfx)
if err != nil {
return err
}
if err := deleteKeys(s, collectedKeys); err != nil {
return err
}
}
return nil
}
func migrateBatchstore(s *Store) error {
collectedKeys, err := collectKeys(s, "batchstore_")
if err != nil {
return err
}
return deleteKeys(s, collectedKeys)
}
func migrateStamp(s *Store) error {
for _, pfx := range []string{"postage", "batchstore", "addressbook_entry_"} {
collectedKeys, err := collectKeys(s, pfx)
if err != nil {
return err
}
if err := deleteKeys(s, collectedKeys); err != nil {
return err
}
}
return nil
}
func migrateGrace(s *Store) error {
var collectedKeys []string
mgfn := func(k, v []byte) (bool, error) {
stk := string(k)
if strings.Contains(stk, "|") &&
len(k) > 32 &&
!strings.Contains(stk, "swap") &&
!strings.Contains(stk, "peer") {
s.logger.Debug("found key designated to deletion", "key", k)
collectedKeys = append(collectedKeys, stk)
}
return false, nil
}
_ = s.Iterate("", mgfn)
for _, v := range collectedKeys {
err := s.Delete(v)
if err != nil {
s.logger.Debug("error deleting key", "key", v)
continue
}
s.logger.Debug("deleted key", "key", v)
}
s.logger.Debug("keys deleted", "count", len(collectedKeys))
return nil
}
func migrateSwap(s *Store) error {
migratePrefix := func(prefix string) error {
keys, err := collectKeys(s, prefix)
if err != nil {
return err
}
for _, key := range keys {
split := strings.SplitAfter(key, prefix)
if len(split) != 2 {
return errors.New("no peer in key")
}
if len(split[1]) != 20 {
s.logger.Debug("skipping already migrated key", "key", key)
continue
}
addr := common.BytesToAddress([]byte(split[1]))
fixed := fmt.Sprintf("%s%x", prefix, addr)
var val string
if err = s.Get(fixed, &val); err == nil {
s.logger.Debug("skipping duplicate key", "key", key)
if err = s.Delete(key); err != nil {
return err
}
continue
}
if !errors.Is(err, storage.ErrNotFound) {
return err
}
if err = s.Get(key, &val); err != nil {
return err
}
if err = s.Put(fixed, val); err != nil {
return err
}
if err = s.Delete(key); err != nil {
return err
}
}
return nil
}
if err := migratePrefix("swap_peer_chequebook_"); err != nil {
return err
}
return migratePrefix("swap_beneficiary_peer_")
}
// migrateKademliaMetrics removes all old existing
// kademlia metrics database content.
func migrateKademliaMetrics(s *Store) error {
for _, prefix := range []string{"peer-last-seen-timestamp", "peer-total-connection-duration"} {
start := time.Now()
s.logger.Debug("removing kademlia metrics", "metrics_prefix", prefix)
keys, err := collectKeys(s, prefix)
if err != nil {
return err
}
if err := deleteKeys(s, keys); err != nil {
return err
}
s.logger.Debug("removing kademlia metrics done", "metrics_prefix", prefix, "elapsed", time.Since(start))
}
return nil
}
func (s *Store) migrate(schemaName string) error {
migrations, err := getMigrations(schemaName, dbSchemaCurrent, schemaMigrations, s)
if err != nil {
return fmt.Errorf("error getting migrations for current schema (%s): %w", schemaName, err)
}
// no migrations to run
if migrations == nil {
return nil
}
s.logger.Debug("statestore: need to run data migrations to schema", "migration_count", len(migrations), "schema_name", schemaName)
for i := 0; i < len(migrations); i++ {
err := migrations[i].fn(s)
if err != nil {
return err
}
err = s.putSchemaName(migrations[i].name) // put the name of the current schema
if err != nil {
return err
}
schemaName, err = s.getSchemaName()
if err != nil {
return err
}
s.logger.Debug("statestore: successfully ran migration", "migration_number", i, "schema_name", schemaName)
}
return nil
}
// getMigrations returns an ordered list of migrations that need be executed
// with no errors in order to bring the statestore to the most up-to-date
// schema definition
func getMigrations(currentSchema, targetSchema string, allSchemeMigrations []migration, store *Store) (migrations []migration, err error) {
foundCurrent := false
foundTarget := false
if currentSchema == dbSchemaCurrent {
return nil, nil
}
for i, v := range allSchemeMigrations {
switch v.name {
case currentSchema:
if foundCurrent {
return nil, errors.New("found schema name for the second time when looking for migrations")
}
foundCurrent = true
store.logger.Debug("statestore migration: migrating schema", "current_schema_name", currentSchema, "next_schema_name", dbSchemaCurrent, "total_migration_count", len(allSchemeMigrations)-i)
continue // current schema migration should not be executed (already has been when schema was migrated to)
case targetSchema:
foundTarget = true
}
if foundCurrent {
migrations = append(migrations, v)
}
}
if !foundCurrent {
return nil, errMissingCurrentSchema
}
if !foundTarget {
return nil, errMissingTargetSchema
}
return migrations, nil
}
func collectKeysExcept(s *Store, prefixesToPreserve []string) (keys []string, err error) {
if err := s.Iterate("", func(k, v []byte) (bool, error) {
stk := string(k)
has := false
for _, v := range prefixesToPreserve {
if strings.HasPrefix(stk, v) {
has = true
break
}
}
if !has {
keys = append(keys, stk)
}
return false, nil
}); err != nil {
return nil, err
}
return keys, nil
}
func collectKeys(s *Store, prefix string) (keys []string, err error) {
if err := s.Iterate(prefix, func(k, v []byte) (bool, error) {
stk := string(k)
if strings.HasPrefix(stk, prefix) {
keys = append(keys, stk)
}
return false, nil
}); err != nil {
return nil, err
}
return keys, nil
}
func deleteKeys(s *Store, keys []string) error {
for _, v := range keys {
err := s.Delete(v)
if err != nil {
return fmt.Errorf("error deleting key %s: %w", v, err)
}
}
s.logger.Debug("keys deleted", "count", len(keys))
return nil
}
// Nuke the store so that only the bare essential entries are
// left. Careful!
func (s *Store) Nuke(forgetStamps bool) error {
var (
keys []string
prefixesToPreserve = []string{"accounting", "pseudosettle", "swap", "non-mineable-overlay"}
err error
)
if !forgetStamps {
prefixesToPreserve = append(prefixesToPreserve, "postage")
}
keys, err = collectKeysExcept(s, prefixesToPreserve)
if err != nil {
return fmt.Errorf("collect keys except: %w", err)
}
return deleteKeys(s, keys)
}