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error.go
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error.go
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// Copyright 2018 ETH Zurich
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package scmp
import (
"fmt"
"strings"
"github.com/scionproto/scion/go/lib/common"
)
var _ common.ErrorNester = (*Error)(nil)
// Error represents an SCMP error, with an optional nested error.
type Error struct {
CT ClassType
Info Info
Err error
}
// NewError creates a new SCMP Error with the specified scmp Class/Type/Info,
// and optional nested error.
func NewError(class Class, type_ Type, info Info, e error) error {
return &Error{CT: ClassType{class, type_}, Info: info, Err: e}
}
func (e *Error) TopError() string {
if e == nil {
return "<nil>"
}
var s []string
s = append(s, fmt.Sprintf("CT: %v", e.CT))
if e.Info != nil {
s = append(s, fmt.Sprintf("Info: %v", e.Info))
}
return strings.Join(s, " ")
}
func (e *Error) Error() string {
return common.FmtError(e)
}
func (e *Error) GetErr() error {
return e.Err
}
// ToError converts an e to an Error. If that fails, it recurses on the nested
// error, if any, and otherwise returns nil.
func ToError(e error) *Error {
if e, ok := e.(*Error); ok {
return e
}
if n := common.GetNestedError(e); n != nil {
return ToError(n)
}
return nil
}