优化KV存储数据表关闭后的错误提示

internal/utils/kvstore/errors.go

@@ -4,12 +4,14 @@ package kvstore
 
 import (
 	"errors"
+	"fmt"
 	"github.com/cockroachdb/pebble"
 )
 
 var ErrTableNotFound = errors.New("table not found")
 var ErrKeyTooLong = errors.New("too long key")
-var ErrSkip= errors.New("skip") // skip count in iterator
+var ErrSkip = errors.New("skip") // skip count in iterator
+var ErrTableClosed = errors.New("table closed")
 
 func IsNotFound(err error) bool {
 	return err != nil && errors.Is(err, pebble.ErrNotFound)
@@ -22,3 +24,7 @@ func IsSkipError(err error) bool {
 func Skip() (bool, error) {
 	return true, ErrSkip
 }
+
+func NewTableClosedErr(tableName string) error {
+	return fmt.Errorf("table '"+tableName+"' closed: %w", ErrTableClosed)
+}