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defer-safe NackDelayed #4

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16 changes: 15 additions & 1 deletion lepus.go
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Original file line number Diff line number Diff line change
Expand Up @@ -196,17 +196,24 @@ func (d *Delivery) Reject(requeue bool) error {
// NackDelayed nacks message without requeue and publishes it again
// without modification back to tail of queue
func (d *Delivery) NackDelayed(multiple, mandatory, immediate bool) (State, error) {
swapped := atomic.CompareAndSwapInt32(&d.acked, 0, 1)
if !swapped {
return StateAlreadyProcessed, nil
}

ch, ok := d.Delivery.Acknowledger.(*Channel)
if !ok {
atomic.StoreInt32(&d.acked, 0)
return StateUnknown, errors.New("Acknowledger is not of type *lepus.Channel")
}

err := d.Nack(multiple, false)
if err != nil {
atomic.StoreInt32(&d.acked, 0)
return StateUnknown, err
}

return ch.PublishAndWait(d.Delivery.Exchange, d.Delivery.RoutingKey, mandatory, immediate, amqp.Publishing{
state, err := ch.PublishAndWait(d.Delivery.Exchange, d.Delivery.RoutingKey, mandatory, immediate, amqp.Publishing{
Headers: d.Delivery.Headers,
ContentType: d.Delivery.ContentType,
ContentEncoding: d.Delivery.ContentEncoding,
Expand All @@ -222,6 +229,13 @@ func (d *Delivery) NackDelayed(multiple, mandatory, immediate bool) (State, erro
AppId: d.Delivery.AppId,
Body: d.Delivery.Body,
})

if err != nil {
atomic.StoreInt32(&d.acked, 0)
return StateUnknown, err
}

return state, nil
}

// MustPublish can be used as a wrapper around `PublishAndWait` and
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15 changes: 8 additions & 7 deletions state.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,16 +7,17 @@ type State int32

// states
const (
StateUnknown State = iota // Unknown
StatePublished // Published
StateReturned // Returned
StateTimeout // Timeout
StateClosed // Closed
StateUnknown State = iota // Unknown
StatePublished // Published
StateReturned // Returned
StateTimeout // Timeout
StateClosed // Closed
StateAlreadyProcessed // AlreadyProcessed
)

const _State_name = "UnknownPublishedReturnedTimeoutClosed"
const _State_name = "UnknownPublishedReturnedTimeoutClosedAlreadyProcessed"

var _State_index = [...]uint8{0, 7, 16, 24, 31, 37}
var _State_index = [...]uint8{0, 7, 16, 24, 31, 37, 53}

func (i State) String() string {
if i < 0 || i >= State(len(_State_index)-1) {
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