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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"
"github.com/ethereum/go-ethereum/common"
)
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"
)
var (
dbSchemaCurrent = dbSchemaFlushBlock
)
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},
}
func migrateFB(s *store) error {
collectedKeys, err := collectKeys(s, "blocklist-")
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.Debugf("found key designated to deletion %s", k)
collectedKeys = append(collectedKeys, stk)
}
return false, nil
}
_ = s.Iterate("", mgfn)
for _, v := range collectedKeys {
err := s.Delete(v)
if err != nil {
s.logger.Debugf("error deleting key %s", v)
continue
}
s.logger.Debugf("deleted key %s", v)
}
s.logger.Debugf("deleted keys: %d", 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")
}
addr := common.BytesToAddress([]byte(split[1]))
fixed := fmt.Sprintf("%s%x", prefix, addr)
var chequebookAddress common.Address
if err = s.Get(key, &chequebookAddress); err != nil {
return err
}
if err = s.Put(fixed, chequebookAddress); err != nil {
return err
}
}
return nil
}
if err := migratePrefix("swap_peer_chequebook_"); err != nil {
return err
}
return migratePrefix("swap_beneficiary_peer_")
}
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.Debugf("statestore: need to run %d data migrations to schema %s", len(migrations), 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.Debugf("statestore: successfully ran migration: id %d current schema: %s", i, 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.Debugf("statestore migration: found current schema %s, migrate to %s, total migrations %d", currentSchema, dbSchemaCurrent, 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 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.Debugf("deleted key %s", v)
}
s.logger.Debugf("deleted keys: %d", len(keys))
return nil
}