reduce replication interface

rpl/file_store.go

@@ -14,14 +14,23 @@ import (
 )
 
 const (
-	defaultMaxLogFileSize = 1024 * 1024 * 1024
+	defaultMaxLogFileSize = uint32(1024 * 1024 * 1024)
+
+	//why 4G, we can use uint32 as offset, reduce memory useage
+	maxLogFileSize = uint32(4*1024*1024*1024 - 1)
 )
 
 /*
-index file format:
-ledis-bin.00001
-ledis-bin.00002
-ledis-bin.00003
+	File Store:
+	0000001.data
+	0000001.meta
+	0000002.data
+	0000002.meta
+
+	data: log1 data | log2 data | magic data
+	meta: log1 pos in data | log2 pos in data
+
+	we use table to mangage data + meta pair
 */
 
 type FileStore struct {
@@ -29,7 +38,7 @@ type FileStore struct {
 
 	m sync.Mutex
 
-	maxFileSize int
+	maxFileSize uint32
 
 	first uint64
 	last  uint64
@@ -66,7 +75,7 @@ func NewFileStore(path string) (*FileStore, error) {
 	return s, nil
 }
 
-func (s *FileStore) SetMaxFileSize(size int) {
+func (s *FileStore) SetMaxFileSize(size uint32) {
 	s.maxFileSize = size
 }
 
@@ -75,11 +84,6 @@ func (s *FileStore) GetLog(id uint64, log *Log) error {
 	return nil
 }
 
-func (s *FileStore) SeekLog(id uint64, log *Log) error {
-	panic("not implementation")
-	return nil
-}
-
 func (s *FileStore) FirstID() (uint64, error) {
 	panic("not implementation")
 	return 0, nil
@@ -95,11 +99,6 @@ func (s *FileStore) StoreLog(log *Log) error {
 	return nil
 }
 
-func (s *FileStore) StoreLogs(logs []*Log) error {
-	panic("not implementation")
-	return nil
-}
-
 func (s *FileStore) Purge(n uint64) error {
 	panic("not implementation")
 	return nil

rpl/file_table.go

@@ -0,0 +1 @@
+package rpl

rpl/goleveldb_store.go

@@ -21,6 +21,8 @@ type GoLevelDBStore struct {
 
 	first uint64
 	last  uint64
+
+	buf bytes.Buffer
 }
 
 func (s *GoLevelDBStore) FirstID() (uint64, error) {
@@ -84,30 +86,10 @@ func (s *GoLevelDBStore) GetLog(id uint64, log *Log) error {
 	}
 }
 
-func (s *GoLevelDBStore) SeekLog(id uint64, log *Log) error {
-	it := s.db.NewIterator()
-	defer it.Close()
-
-	it.Seek(num.Uint64ToBytes(id))
-
-	if !it.Valid() {
-		return ErrLogNotFound
-	} else {
-		return log.Decode(bytes.NewBuffer(it.RawValue()))
-	}
-}
-
 func (s *GoLevelDBStore) StoreLog(log *Log) error {
-	return s.StoreLogs([]*Log{log})
-}
-
-func (s *GoLevelDBStore) StoreLogs(logs []*Log) error {
 	s.m.Lock()
 	defer s.m.Unlock()
 
-	w := s.db.NewWriteBatch()
-	defer w.Rollback()
-
 	last, err := s.lastID()
 	if err != nil {
 		return err
@@ -115,24 +97,20 @@ func (s *GoLevelDBStore) StoreLogs(logs []*Log) error {
 
 	s.last = InvalidLogID
 
-	var buf bytes.Buffer
-	for _, log := range logs {
-		buf.Reset()
+	s.buf.Reset()
 
-		if log.ID <= last {
-			return ErrLessLogID
-		}
-
-		last = log.ID
-		key := num.Uint64ToBytes(log.ID)
-
-		if err := log.Encode(&buf); err != nil {
-			return err
-		}
-		w.Put(key, buf.Bytes())
+	if log.ID != last+1 {
+		return ErrStoreLogID
 	}
 
-	if err = w.Commit(); err != nil {
+	last = log.ID
+	key := num.Uint64ToBytes(log.ID)
+
+	if err := log.Encode(&s.buf); err != nil {
+		return err
+	}
+
+	if err = s.db.Put(key, s.buf.Bytes()); err != nil {
 		return err
 	}
 

rpl/rpl.go

@@ -135,14 +135,10 @@ func (r *Replication) WaitLog() <-chan struct{} {
 }
 
 func (r *Replication) StoreLog(log *Log) error {
-	return r.StoreLogs([]*Log{log})
-}
-
-func (r *Replication) StoreLogs(logs []*Log) error {
 	r.m.Lock()
 	defer r.m.Unlock()
 
-	return r.s.StoreLogs(logs)
+	return r.s.StoreLog(log)
 }
 
 func (r *Replication) FirstLogID() (uint64, error) {

rpl/store.go

@@ -10,22 +10,18 @@ const (
 
 var (
 	ErrLogNotFound = errors.New("log not found")
-	ErrLessLogID   = errors.New("log id is less")
+	ErrStoreLogID  = errors.New("log id is less")
 	ErrNoBehindLog = errors.New("no behind commit log")
 )
 
 type LogStore interface {
 	GetLog(id uint64, log *Log) error
 
-	// Get the first log which ID is equal or larger than id
-	SeekLog(id uint64, log *Log) error
-
 	FirstID() (uint64, error)
 	LastID() (uint64, error)
 
 	// if log id is less than current last id, return error
 	StoreLog(log *Log) error
-	StoreLogs(logs []*Log) error
 
 	// Delete first n logs
 	Purge(n uint64) error

rpl/store_test.go

@@ -63,16 +63,15 @@ func testLogs(t *testing.T, l LogStore) {
 	}
 
 	// Attempt to write multiple logs
-	var logs []*Log
 	for i := 11; i <= 20; i++ {
 		nl := &Log{
 			ID:   uint64(i),
 			Data: []byte("first"),
 		}
-		logs = append(logs, nl)
-	}
-	if err := l.StoreLogs(logs); err != nil {
-		t.Fatalf("err: %v", err)
+
+		if err := l.StoreLog(nl); err != nil {
+			t.Fatalf("err: %v", err)
+		}
 	}
 
 	// Try to fetch
@@ -157,7 +156,7 @@ func testLogs(t *testing.T, l LogStore) {
 	}
 
 	now := uint32(time.Now().Unix())
-	logs = []*Log{}
+	logs := []*Log{}
 	for i := 1; i <= 20; i++ {
 		nl := &Log{
 			ID:         uint64(i),