Exposed the LevelDB iterator in the DB struct.

db.go

@@ -12,6 +12,8 @@ type DB interface {
 	NewBatch() Batch
 
 	// For debugging
+	Iterator() Iterator
+	Next(Iterator) (key []byte, value []byte)
 	Print()
 }
 
@@ -21,6 +23,12 @@ type Batch interface {
 	Write()
 }
 
+type Iterator interface {
+	Next() bool
+	Key() []byte
+	Value() []byte
+}
+
 //-----------------------------------------------------------------------------
 
 const (

go_level_db.go

@@ -90,6 +90,15 @@ func (db *GoLevelDB) Print() {
 	}
 }
 
+func (db *GoLevelDB) Iterator() Iterator {
+	return db.db.NewIterator(nil, nil)
+}
+
+func (db *GoLevelDB) Next(iter Iterator) ([]byte, []byte) {
+	iter.Next()
+	return iter.Key(), iter.Value()
+}
+
 func (db *GoLevelDB) NewBatch() Batch {
 	batch := new(leveldb.Batch)
 	return &goLevelDBBatch{db, batch}

mem_db.go

@@ -65,6 +65,16 @@ func (db *MemDB) Print() {
 	}
 }
 
+// TODO: needs to be wired to range db.db
+func (db *MemDB) Iterator() Iterator {
+	return nil
+}
+
+// TODO: needs to be wired to range db.db
+func (db *MemDB) Next(iter Iterator) (key []byte, value []byte) {
+	return nil, nil
+}
+
 func (db *MemDB) NewBatch() Batch {
 	return &memDBBatch{db, nil}
 }