istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/util/istiomultierror/util.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package istiomultierror
    16  
    17  import (
    18  	"fmt"
    19  	"strings"
    20  
    21  	"github.com/hashicorp/go-multierror"
    22  )
    23  
    24  // MultiErrorFormat provides a format for multierrors. This matches the default format, but if there
    25  // is only one error we will not expand to multiple lines.
    26  func MultiErrorFormat() multierror.ErrorFormatFunc {
    27  	return func(es []error) string {
    28  		if len(es) == 1 {
    29  			return es[0].Error()
    30  		}
    31  
    32  		points := make([]string, len(es))
    33  		for i, err := range es {
    34  			points[i] = fmt.Sprintf("* %s", err)
    35  		}
    36  
    37  		return fmt.Sprintf(
    38  			"%d errors occurred:\n\t%s\n",
    39  			len(es), strings.Join(points, "\n\t"))
    40  	}
    41  }
    42  
    43  func New() *multierror.Error {
    44  	return &multierror.Error{
    45  		ErrorFormat: MultiErrorFormat(),
    46  	}
    47  }