write batch add data function

leveled will support it later

Godeps/Godeps.json

@@ -56,7 +56,7 @@
 		},
 		{
 			"ImportPath": "github.com/siddontang/goleveldb/leveldb",
-			"Rev": "448b15792e63fe835c48d294f9b7859a86f4b76e"
+			"Rev": "41805642b981fb3d9462f6641bcb94b8609ca791"
 		},
 		{
 			"ImportPath": "github.com/szferi/gomdb",

store/driver/batch.go

@@ -1,5 +1,9 @@
 package driver
 
+import (
+	"github.com/siddontang/goleveldb/leveldb"
+)
+
 type BatchPuter interface {
 	BatchPut([]Write) error
 	SyncBatchPut([]Write) error
@@ -11,34 +15,48 @@ type Write struct {
 }
 
 type WriteBatch struct {
-	batch BatchPuter
-	wb    []Write
+	d *leveldb.Batch
+
+	wb []Write
+	w  BatchPuter
 }
 
-func (w *WriteBatch) Put(key, value []byte) {
-	if value == nil {
-		value = []byte{}
-	}
-	w.wb = append(w.wb, Write{key, value})
+func (wb *WriteBatch) Put(key, value []byte) {
+	wb.wb = append(wb.wb, Write{key, value})
 }
 
-func (w *WriteBatch) Delete(key []byte) {
-	w.wb = append(w.wb, Write{key, nil})
+func (wb *WriteBatch) Delete(key []byte) {
+	wb.wb = append(wb.wb, Write{key, nil})
 }
 
-func (w *WriteBatch) Commit() error {
-	return w.batch.BatchPut(w.wb)
+func (wb *WriteBatch) Commit() error {
+	return wb.w.BatchPut(wb.wb)
 }
 
-func (w *WriteBatch) SyncCommit() error {
-	return w.batch.SyncBatchPut(w.wb)
+func (wb *WriteBatch) SyncCommit() error {
+	return wb.w.SyncBatchPut(wb.wb)
 }
 
-func (w *WriteBatch) Rollback() error {
-	w.wb = w.wb[0:0]
+func (wb *WriteBatch) Rollback() error {
+	wb.wb = wb.wb[0:0]
 	return nil
 }
 
-func NewWriteBatch(puter BatchPuter) IWriteBatch {
-	return &WriteBatch{puter, []Write{}}
+func (wb *WriteBatch) Data() []byte {
+	wb.d.Reset()
+	for _, w := range wb.wb {
+		if w.Value == nil {
+			wb.Delete(w.Key)
+		} else {
+			wb.Put(w.Key, w.Value)
+		}
+	}
+	return wb.d.Dump()
+}
+
+func NewWriteBatch(puter BatchPuter) *WriteBatch {
+	return &WriteBatch{
+		&leveldb.Batch{},
+		[]Write{},
+		puter}
 }

store/driver/driver.go

@@ -58,6 +58,7 @@ type IWriteBatch interface {
 	Commit() error
 	SyncCommit() error
 	Rollback() error
+	Data() []byte
 }
 
 type Tx interface {

store/goleveldb/batch.go

@@ -29,3 +29,7 @@ func (w *WriteBatch) Rollback() error {
 	w.wbatch.Reset()
 	return nil
 }
+
+func (w *WriteBatch) Data() []byte {
+	return w.wbatch.Dump()
+}

store/leveldb/batch.go

@@ -63,3 +63,8 @@ func (w *WriteBatch) commit(wb *WriteOptions) error {
 	}
 	return nil
 }
+
+func (w *WriteBatch) Data() []byte {
+	//todo later
+	return nil
+}

store/rocksdb/batch.go

@@ -73,3 +73,10 @@ func (w *WriteBatch) commit(wb *WriteOptions) error {
 	}
 	return nil
 }
+
+func (w *WriteBatch) Data() []byte {
+	var vallen C.size_t
+	value := C.rocksdb_writebatch_data(w.wbatch, &vallen)
+
+	return slice(unsafe.Pointer(value), int(vallen))
+}