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err_queue.go
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/
err_queue.go
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package xerrorz
import (
"fmt"
"golang.org/x/xerrors"
)
// ErrQueue is a helper struct for allowing xerrors to go along well with tree-structured errors
type ErrQueue struct {
Curr error // Not ErrQueue
Queue []*error
}
func NewErrQueue(
curr error,
queue []*error) *ErrQueue {
if _, isErrQueue := curr.(ErrQueue); isErrQueue {
panic("Nested ErrQueue is not allowed") // TODO: Support ErrQueue in ErrQueue.Curr
}
return &ErrQueue{
Curr: curr,
Queue: queue}
}
func (e ErrQueue) Error() string {
return e.Curr.Error()
}
func (e ErrQueue) Format(s fmt.State, v rune) {
xerrors.FormatError(e, s, v)
}
func (e ErrQueue) FormatError(p xerrors.Printer) error {
fErr, isFormatter := e.Curr.(xerrors.Formatter)
_, isErrQueue := e.Curr.(ErrQueue)
if isFormatter && !isErrQueue {
fErr.FormatError(p)
} else {
p.Print(e.Curr.Error())
}
return e.Unwrap()
}
func (e ErrQueue) Unwrap() error {
// Dig the error if a wrapper
if wErr, ok := e.Curr.(xerrors.Wrapper); ok {
return ErrQueue{
Curr: wErr.Unwrap(),
Queue: e.Queue}
}
// Dequeue
l := len(e.Queue)
switch {
case l >= 2:
return ErrQueue{
Curr: *e.Queue[0],
Queue: e.Queue[1:]}
case l == 1:
return *e.Queue[0]
default:
return nil
}
}