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errors.go
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errors.go
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/*
* Nuts go core
* Copyright (C) 2019 Nuts community
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
package core
import (
"context"
"errors"
"fmt"
"net"
)
// Error is the interface that extends the default error interface
type Error interface {
error
// Recoverable indicates if an action which resulted in the error can be retried
Recoverable() bool
}
// NutsEventError is the main implementation adding a recoverable field to an error.
// This field will tell if the error is definitive or can be retried at a later moment.
type NutsEventError struct {
err error
recoverable bool
}
// NewError is a convenience method for creating a simple error
func NewError(msg string, recoverable bool) Error {
return &NutsEventError{
err: errors.New(msg),
recoverable: recoverable,
}
}
// Errorf creates a new NutsEventError with given format and values
func Errorf(format string, recoverable bool, a ...interface{}) Error {
return &NutsEventError{
err: fmt.Errorf(format, a...),
recoverable: recoverable,
}
}
// Wrap tries to identify the error and sets recoverable
func Wrap(err error) Error {
var recoverable bool
// net.Error interface
var netError net.Error
if errors.As(err, &netError) {
recoverable = true
}
// context.Deadline, or client side timeout
if errors.Is(err, context.DeadlineExceeded) {
recoverable = true
}
// json.SyntaxError is not recoverable
return Errorf("%w", recoverable, err)
}
func (ne *NutsEventError) Error() string {
return ne.err.Error()
}
// Recoverable indicates if an action which resulted in the error can be retried
func (ne *NutsEventError) Recoverable() bool {
return ne.recoverable
}
// Is is a wrapper for errors.Is()
func (ne *NutsEventError) Is(target error) bool {
return errors.Is(ne.err, target)
}
// UnWrap is needed for NutsEventError to be UnWrapped
func (ne NutsEventError) UnWrap() error {
return errors.Unwrap(ne.err)
}