github.com/oam-dev/kubevela@v1.9.11/pkg/utils/errors/list.go (about)

     1  /*
     2  Copyright 2021 The KubeVela Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package errors
    18  
    19  import (
    20  	"fmt"
    21  	"strings"
    22  )
    23  
    24  // ErrorList wraps a list of errors, it also fit for an Error interface
    25  type ErrorList []error
    26  
    27  // Error implement error interface
    28  func (e ErrorList) Error() string {
    29  	if !e.HasError() {
    30  		// it reports an empty string if error is nil
    31  		return ""
    32  	}
    33  	errMessages := make([]string, len(e))
    34  	for i, err := range e {
    35  		errMessages[i] = err.Error()
    36  	}
    37  	return fmt.Sprintf("Found %d errors. [(%s)]", len(e), strings.Join(errMessages, "), ("))
    38  }
    39  
    40  // HasError check if any error exists in list
    41  func (e ErrorList) HasError() bool {
    42  	if e == nil {
    43  		return false
    44  	}
    45  	return len(e) > 0
    46  }
    47  
    48  // AggregateErrors aggregate errors into ErrorList and filter nil, if no error found, return nil
    49  func AggregateErrors(errs []error) error {
    50  	var es ErrorList
    51  	for _, err := range errs {
    52  		if err != nil {
    53  			es = append(es, err)
    54  		}
    55  	}
    56  	if es.HasError() {
    57  		return es
    58  	}
    59  	return nil
    60  }