vendor/google.golang.org/appengine/errors.go

   1 // Copyright 2011 Google Inc. All rights reserved.
   2 // Use of this source code is governed by the Apache 2.0
   3 // license that can be found in the LICENSE file.
   4
   5 // This file provides error functions for common API failure modes.
   6
   7 package appengine
   8
   9 import (
  10         "fmt"
  11
  12         "google.golang.org/appengine/internal"
  13 )
  14
  15 // IsOverQuota reports whether err represents an API call failure
  16 // due to insufficient available quota.
  17 func IsOverQuota(err error) bool {
  18         callErr, ok := err.(*internal.CallError)
  19         return ok && callErr.Code == 4
  20 }
  21
  22 // MultiError is returned by batch operations when there are errors with
  23 // particular elements. Errors will be in a one-to-one correspondence with
  24 // the input elements; successful elements will have a nil entry.
  25 type MultiError []error
  26
  27 func (m MultiError) Error() string {
  28         s, n := "", 0
  29         for _, e := range m {
  30                 if e != nil {
  31                         if n == 0 {
  32                                 s = e.Error()
  33                         }
  34                         n++
  35                 }
  36         }
  37         switch n {
  38         case 0:
  39                 return "(0 errors)"
  40         case 1:
  41                 return s
  42         case 2:
  43                 return s + " (and 1 other error)"
  44         }
  45         return fmt.Sprintf("%s (and %d other errors)", s, n-1)
  46 }