github.com/sagernet/sing@v0.2.6/common/exceptions/multi.go (about)

     1  package exceptions
     2  
     3  import (
     4  	"errors"
     5  	"strings"
     6  
     7  	"github.com/sagernet/sing/common"
     8  	F "github.com/sagernet/sing/common/format"
     9  )
    10  
    11  type multiError struct {
    12  	errors []error
    13  }
    14  
    15  func (e *multiError) Error() string {
    16  	return strings.Join(F.MapToString(e.errors), " | ")
    17  }
    18  
    19  func (e *multiError) Unwrap() []error {
    20  	return e.errors
    21  }
    22  
    23  func Errors(errors ...error) error {
    24  	errors = common.FilterNotNil(errors)
    25  	errors = ExpandAll(errors)
    26  	errors = common.UniqBy(errors, error.Error)
    27  	switch len(errors) {
    28  	case 0:
    29  		return nil
    30  	case 1:
    31  		return errors[0]
    32  	}
    33  	return &multiError{
    34  		errors: errors,
    35  	}
    36  }
    37  
    38  func Expand(err error) []error {
    39  	if multiErr, isMultiErr := err.(MultiError); isMultiErr {
    40  		return ExpandAll(multiErr.Unwrap())
    41  	}
    42  	return []error{err}
    43  }
    44  
    45  func ExpandAll(errs []error) []error {
    46  	return common.FlatMap(errs, Expand)
    47  }
    48  
    49  func Append(err error, other error, block func(error) error) error {
    50  	if other == nil {
    51  		return err
    52  	}
    53  	return Errors(err, block(other))
    54  }
    55  
    56  func IsMulti(err error, targetList ...error) bool {
    57  	for _, target := range targetList {
    58  		if errors.Is(err, target) {
    59  			return true
    60  		}
    61  	}
    62  	err = Unwrap(err)
    63  	multiErr, isMulti := err.(MultiError)
    64  	if !isMulti {
    65  		return false
    66  	}
    67  	return common.All(multiErr.Unwrap(), func(it error) bool {
    68  		return IsMulti(it, targetList...)
    69  	})
    70  }