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errors.go
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errors.go
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/*
* Virtualpaper is a service to manage users paper documents in virtual format.
* Copyright (C) 2020 Tero Vierimaa
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/*
Package errors contains application specific error specification
and resolution.
*/
package errors
import (
"errors"
"fmt"
"runtime/debug"
"strings"
)
var New = errors.New
var Is = errors.Is
var As = errors.As
var Unwrap = errors.Unwrap
type Error struct {
ErrType string
ErrMsg string
Err error
Stack []byte
}
func newError(errType string) Error {
return Error{
ErrType: errType,
ErrMsg: errType,
}
}
func (e *Error) SetStack() {
e.Stack = []byte(getStack(8))
}
// getStack returns stack trace.
// Set skip>2 to remove not-interesting lines, such as (errors.go/getStack()).
func getStack(skip int) string {
rawStack := string(debug.Stack())
// remove top two functions from stack, that is, debug.Stack, task.recoverPanic && Panic
lines := strings.Split(rawStack, "\n")
// goroutine num
stack := lines[0]
prints := lines[skip:]
for _, v := range prints {
stack = stack + "\n" + v
}
return stack
}
func (e Error) Error() string {
if e.Err != nil {
return fmt.Sprintf("%s - %s: %s", e.ErrType, e.ErrMsg, e.Err.Error())
}
return fmt.Sprintf("%s - %s", e.ErrType, e.ErrMsg)
}
func (e Error) Is(target error) bool {
eTarget, ok := target.(Error)
if !ok {
return false
}
return eTarget.ErrType == e.ErrType
}
var ErrRecordNotFound = newError("not found")
var ErrForbidden = newError("forbidden")
var ErrUnauthorized = newError("unauthorized")
var ErrAlreadyExists = newError("already exists")
var ErrInternalError = newError("internal error")
var ErrInvalid = newError("invalid request")