core/rawdb: drop MigrateTable (ethereum#30331)

These are the leftovers from ethereum#24028.

core/rawdb/database.go

@@ -149,12 +149,6 @@ func (db *nofreezedb) ReadAncients(fn func(reader ethdb.AncientReaderOp) error)
 	return fn(db)
 }
 
-// MigrateTable processes the entries in a given table in sequence
-// converting them to a new format if they're of an old format.
-func (db *nofreezedb) MigrateTable(kind string, convert convertLegacyFn) error {
-	return errNotSupported
-}
-
 // AncientDatadir returns an error as we don't have a backing chain freezer.
 func (db *nofreezedb) AncientDatadir() (string, error) {
 	return "", errNotSupported

core/rawdb/freezer.go

@@ -24,9 +24,7 @@ import (
 	"path/filepath"
 	"sync"
 	"sync/atomic"
-	"time"
 
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/metrics"
@@ -389,115 +387,3 @@ func (f *Freezer) repair() error {
 	f.tail.Store(tail)
 	return nil
 }
-
-// convertLegacyFn takes a raw freezer entry in an older format and
-// returns it in the new format.
-type convertLegacyFn = func([]byte) ([]byte, error)
-
-// MigrateTable processes the entries in a given table in sequence
-// converting them to a new format if they're of an old format.
-func (f *Freezer) MigrateTable(kind string, convert convertLegacyFn) error {
-	if f.readonly {
-		return errReadOnly
-	}
-	f.writeLock.Lock()
-	defer f.writeLock.Unlock()
-
-	table, ok := f.tables[kind]
-	if !ok {
-		return errUnknownTable
-	}
-	// forEach iterates every entry in the table serially and in order, calling `fn`
-	// with the item as argument. If `fn` returns an error the iteration stops
-	// and that error will be returned.
-	forEach := func(t *freezerTable, offset uint64, fn func(uint64, []byte) error) error {
-		var (
-			items     = t.items.Load()
-			batchSize = uint64(1024)
-			maxBytes  = uint64(1024 * 1024)
-		)
-		for i := offset; i < items; {
-			if i+batchSize > items {
-				batchSize = items - i
-			}
-			data, err := t.RetrieveItems(i, batchSize, maxBytes)
-			if err != nil {
-				return err
-			}
-			for j, item := range data {
-				if err := fn(i+uint64(j), item); err != nil {
-					return err
-				}
-			}
-			i += uint64(len(data))
-		}
-		return nil
-	}
-	// TODO(s1na): This is a sanity-check since as of now no process does tail-deletion. But the migration
-	// process assumes no deletion at tail and needs to be modified to account for that.
-	if table.itemOffset.Load() > 0 || table.itemHidden.Load() > 0 {
-		return errors.New("migration not supported for tail-deleted freezers")
-	}
-	ancientsPath := filepath.Dir(table.index.Name())
-	// Set up new dir for the migrated table, the content of which
-	// we'll at the end move over to the ancients dir.
-	migrationPath := filepath.Join(ancientsPath, "migration")
-	newTable, err := newFreezerTable(migrationPath, kind, table.noCompression, false)
-	if err != nil {
-		return err
-	}
-	var (
-		batch  = newTable.newBatch()
-		out    []byte
-		start  = time.Now()
-		logged = time.Now()
-		offset = newTable.items.Load()
-	)
-	if offset > 0 {
-		log.Info("found previous migration attempt", "migrated", offset)
-	}
-	// Iterate through entries and transform them
-	if err := forEach(table, offset, func(i uint64, blob []byte) error {
-		if i%10000 == 0 && time.Since(logged) > 16*time.Second {
-			log.Info("Processing legacy elements", "count", i, "elapsed", common.PrettyDuration(time.Since(start)))
-			logged = time.Now()
-		}
-		out, err = convert(blob)
-		if err != nil {
-			return err
-		}
-		if err := batch.AppendRaw(i, out); err != nil {
-			return err
-		}
-		return nil
-	}); err != nil {
-		return err
-	}
-	if err := batch.commit(); err != nil {
-		return err
-	}
-	log.Info("Replacing old table files with migrated ones", "elapsed", common.PrettyDuration(time.Since(start)))
-	// Release and delete old table files. Note this won't
-	// delete the index file.
-	table.releaseFilesAfter(0, true)
-
-	if err := newTable.Close(); err != nil {
-		return err
-	}
-	files, err := os.ReadDir(migrationPath)
-	if err != nil {
-		return err
-	}
-	// Move migrated files to ancients dir.
-	for _, f := range files {
-		// This will replace the old index file as a side-effect.
-		if err := os.Rename(filepath.Join(migrationPath, f.Name()), filepath.Join(ancientsPath, f.Name())); err != nil {
-			return err
-		}
-	}
-	// Delete by now empty dir.
-	if err := os.Remove(migrationPath); err != nil {
-		return err
-	}
-	return nil
-}

core/rawdb/freezer_memory.go

@@ -394,13 +394,6 @@ func (f *MemoryFreezer) Sync() error {
 	return nil
 }
 
-// MigrateTable processes and migrates entries of a given table to a new format.
-// The second argument is a function that takes a raw entry and returns it
-// in the newest format.
-func (f *MemoryFreezer) MigrateTable(string, func([]byte) ([]byte, error)) error {
-	return errors.New("not implemented")
-}
-
 // Close releases all the sources held by the memory freezer. It will panic if
 // any following invocation is made to a closed freezer.
 func (f *MemoryFreezer) Close() error {

core/rawdb/freezer_resettable.go

@@ -202,15 +202,6 @@ func (f *resettableFreezer) Sync() error {
 	return f.freezer.Sync()
 }
 
-// MigrateTable processes the entries in a given table in sequence
-// converting them to a new format if they're of an old format.
-func (f *resettableFreezer) MigrateTable(kind string, convert convertLegacyFn) error {
-	f.lock.RLock()
-	defer f.lock.RUnlock()
-
-	return f.freezer.MigrateTable(kind, convert)
-}
-
 // cleanup removes the directory located in the specified path
 // has the name with deletion marker suffix.
 func cleanup(path string) error {

core/rawdb/freezer_test.go

@@ -22,8 +22,6 @@ import (
 	"fmt"
 	"math/big"
 	"math/rand"
-	"os"
-	"path/filepath"
 	"sync"
 	"testing"
 
@@ -379,87 +377,6 @@ func checkAncientCount(t *testing.T, f *Freezer, kind string, n uint64) {
 	}
 }
 
-func TestRenameWindows(t *testing.T) {
-	var (
-		fname   = "file.bin"
-		fname2  = "file2.bin"
-		data    = []byte{1, 2, 3, 4}
-		data2   = []byte{2, 3, 4, 5}
-		data3   = []byte{3, 5, 6, 7}
-		dataLen = 4
-	)
-
-	// Create 2 temp dirs
-	dir1 := t.TempDir()
-	dir2 := t.TempDir()
-
-	// Create file in dir1 and fill with data
-	f, err := os.Create(filepath.Join(dir1, fname))
-	if err != nil {
-		t.Fatal(err)
-	}
-	f2, err := os.Create(filepath.Join(dir1, fname2))
-	if err != nil {
-		t.Fatal(err)
-	}
-	f3, err := os.Create(filepath.Join(dir2, fname2))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if _, err := f.Write(data); err != nil {
-		t.Fatal(err)
-	}
-	if _, err := f2.Write(data2); err != nil {
-		t.Fatal(err)
-	}
-	if _, err := f3.Write(data3); err != nil {
-		t.Fatal(err)
-	}
-	if err := f.Close(); err != nil {
-		t.Fatal(err)
-	}
-	if err := f2.Close(); err != nil {
-		t.Fatal(err)
-	}
-	if err := f3.Close(); err != nil {
-		t.Fatal(err)
-	}
-	if err := os.Rename(f.Name(), filepath.Join(dir2, fname)); err != nil {
-		t.Fatal(err)
-	}
-	if err := os.Rename(f2.Name(), filepath.Join(dir2, fname2)); err != nil {
-		t.Fatal(err)
-	}
-
-	// Check file contents
-	f, err = os.Open(filepath.Join(dir2, fname))
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer f.Close()
-	defer os.Remove(f.Name())
-	buf := make([]byte, dataLen)
-	if _, err := f.Read(buf); err != nil {
-		t.Fatal(err)
-	}
-	if !bytes.Equal(buf, data) {
-		t.Errorf("unexpected file contents. Got %v\n", buf)
-	}
-
-	f, err = os.Open(filepath.Join(dir2, fname2))
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer f.Close()
-	defer os.Remove(f.Name())
-	if _, err := f.Read(buf); err != nil {
-		t.Fatal(err)
-	}
-	if !bytes.Equal(buf, data2) {
-		t.Errorf("unexpected file contents. Got %v\n", buf)
-	}
-}
-
 func TestFreezerCloseSync(t *testing.T) {
 	t.Parallel()
 	f, _ := newFreezerForTesting(t, map[string]bool{"a": true, "b": true})

core/rawdb/table.go

@@ -113,12 +113,6 @@ func (t *table) Sync() error {
 	return t.db.Sync()
 }
 
-// MigrateTable processes the entries in a given table in sequence
-// converting them to a new format if they're of an old format.
-func (t *table) MigrateTable(kind string, convert convertLegacyFn) error {
-	return t.db.MigrateTable(kind, convert)
-}
-
 // AncientDatadir returns the ancient datadir of the underlying database.
 func (t *table) AncientDatadir() (string, error) {
 	return t.db.AncientDatadir()

ethdb/database.go

@@ -124,11 +124,6 @@ type AncientWriter interface {
 
 	// Sync flushes all in-memory ancient store data to disk.
 	Sync() error
-
-	// MigrateTable processes and migrates entries of a given table to a new format.
-	// The second argument is a function that takes a raw entry and returns it
-	// in the newest format.
-	MigrateTable(string, func([]byte) ([]byte, error)) error
 }
 
 // AncientWriteOp is given to the function argument of ModifyAncients.

ethdb/remotedb/remotedb.go

@@ -110,10 +110,6 @@ func (db *Database) Sync() error {
 	return nil
 }
 
-func (db *Database) MigrateTable(s string, f func([]byte) ([]byte, error)) error {
-	panic("not supported")
-}
-
 func (db *Database) NewBatch() ethdb.Batch {
 	panic("not supported")
 }