60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
|
// Package agherr contains the extended error type, and the function for
|
||
|
|
// wrapping several errors.
|
||
|
|
package agherr
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
// manyError is an error containing several wrapped errors. It is created to be
|
||
|
|
// a simpler version of the API provided by github.com/joomcode/errorx.
|
||
|
|
type manyError struct {
|
||
|
|
message string
|
||
|
|
underlying []error
|
||
|
|
}
|
||
|
|
|
||
|
|
// Many wraps several errors and returns a single error.
|
||
|
|
func Many(message string, underlying ...error) error {
|
||
|
|
err := &manyError{
|
||
|
|
message: message,
|
||
|
|
underlying: underlying,
|
||
|
|
}
|
||
|
|
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// Error implements the error interface for *manyError.
|
||
|
|
func (e *manyError) Error() string {
|
||
|
|
switch len(e.underlying) {
|
||
|
|
case 0:
|
||
|
|
return e.message
|
||
|
|
case 1:
|
||
|
|
return fmt.Sprintf("%s: %s", e.message, e.underlying[0])
|
||
|
|
default:
|
||
|
|
b := &strings.Builder{}
|
||
|
|
|
||
|
|
// Ignore errors, since strings.(*Buffer).Write never returns
|
||
|
|
// errors.
|
||
|
|
_, _ = fmt.Fprintf(b, "%s: %s (hidden: %s", e.message, e.underlying[0], e.underlying[1])
|
||
|
|
for _, u := range e.underlying[2:] {
|
||
|
|
// See comment above.
|
||
|
|
_, _ = fmt.Fprintf(b, ", %s", u)
|
||
|
|
}
|
||
|
|
|
||
|
|
// See comment above.
|
||
|
|
_, _ = b.WriteString(")")
|
||
|
|
|
||
|
|
return b.String()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Unwrap implements the hidden errors.wrapper interface for *manyError.
|
||
|
|
func (e *manyError) Unwrap() error {
|
||
|
|
if len(e.underlying) == 0 {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
return e.underlying[0]
|
||
|
|
}
|