✏ return nil for notfound

mysql/mysql.go

@@ -2,7 +2,6 @@ package mysql
 
 import (
 	"database/sql"
-	"errors"
 	"fmt"
 	"time"
 
@@ -23,11 +22,6 @@ type Storage struct {
 	sqlGC     string
 }
 
-
-// ErrNotFound means that a get call did not find the requested key.
-var ErrNotFound = errors.New("key not found")
-var ErrKeyNotExist = ErrNotFound
-
 var (
 	dropQuery = "DROP TABLE IF EXISTS %s;"
 	initQuery = []string{
@@ -102,7 +96,7 @@ var noRows = "sql: no rows in result set"
 // Get value by key
 func (s *Storage) Get(key string) ([]byte, error) {
 	if len(key) <= 0 {
-		return nil, ErrNotFound
+		return nil, nil
 	}
 	row := s.db.QueryRow(s.sqlSelect, key)
 
@@ -115,14 +109,14 @@ func (s *Storage) Get(key string) ([]byte, error) {
 
 	if err := row.Scan(&data, &exp); err != nil {
 		if err == sql.ErrNoRows {
-			return nil, ErrNotFound
+			return nil, nil
 		}
 		return nil, err
 	}
 
 	// If the expiration time has already passed, then return nil
 	if exp != 0 && exp <= time.Now().Unix() {
-		return nil, ErrNotFound
+		return nil, nil
 	}
 
 	return data, nil