Enabaled interleaving in SQLite backend.

main.go

@@ -30,6 +30,7 @@ func main() {
 		driver      string
 		cacheSize   int
 		version     bool
+		interleaved bool
 		gcDuration  string
 	)
 
@@ -38,6 +39,7 @@ func main() {
 	flag.StringVar(&host, "host", "", "host to bind")
 	flag.IntVar(&cacheSize, "cache", 32, "cache size in MB")
 	flag.BoolVar(&version, "version", false, "Print version and exit.")
+	flag.BoolVar(&interleaved, "interleaved", false, "Backend stores key in interleaved form.")
 	flag.StringVar(&gcDuration, "gc-duration", GCDuration, "Duration between forced GCs.")
 	flag.Parse()
 
@@ -63,10 +65,7 @@ func main() {
 	}
 
 	if driver == "sqlite" {
-		if backend, err = NewSqliteBackend(
+		if backend, err = NewSqliteBackend(args[0], interleaved); err != nil {
-			args[0],
-			common.EncodeStringToBytes,
-			common.DecodeStringFromBytes); err != nil {
 			log.Fatal(err)
 		}
 	} else {

sqlite.go

@@ -29,6 +29,7 @@ type SqliteBackend struct {
 	db          *sql.DB
 	encoder     common.KeyEncoder
 	decoder     common.KeyDecoder
+	interleaved bool
 	existsStmt  *sql.Stmt
 	fetchStmt   *sql.Stmt
 	insertStmt  *sql.Stmt
@@ -55,12 +56,9 @@ func (ss *SqliteSession) Close() error {
 	return nil
 }
 
-func NewSqliteBackend(
+func NewSqliteBackend(path string, interleaved bool) (sqlb *SqliteBackend, err error) {
-	path string,
-	encoder common.KeyEncoder,
-	decoder common.KeyDecoder) (sqlb *SqliteBackend, err error) {
 
-	res := SqliteBackend{}
+	res := SqliteBackend{interleaved: interleaved}
 
 	if res.db, err = sql.Open("sqlite3", path); err != nil {
 		return
@@ -96,8 +94,13 @@ func NewSqliteBackend(
 		return
 	}
 
-	res.encoder = encoder
+	if interleaved {
-	res.decoder = decoder
+		res.encoder = common.EncodeStringToBytes
+		res.decoder = common.DecodeStringFromBytes
+	} else {
+		res.encoder = common.EncodeStringToBytesFromInterleaved
+		res.decoder = common.DecodeStringFromBytesToInterleaved
+	}
 
 	sqlb = &res
 	return