func (channel *Channel) nackBelow(tag uint64, requeue bool, commitTx bool) *amqp.AMQPError {
channel.ackLock.Lock()
defer channel.ackLock.Unlock()
// Transaction mode
if channel.txMode && !commitTx {
channel.txLock.Lock()
defer channel.txLock.Unlock()
channel.txAcks = append(channel.txAcks, amqp.NewTxAck(tag, true, requeue, true))
return nil
}
// Non-transaction mode
var count = 0
for k, unacked := range channel.awaitingAcks {
if k <= tag || tag == 0 {
count += 1
// Init
consumer, cFound := channel.consumers[unacked.ConsumerTag]
queue, qFound := channel.server.queues[unacked.QueueName]
// Initialize resource holders array
var rhs = []amqp.MessageResourceHolder{channel}
if cFound {
rhs = append(rhs, consumer)
}
// requeue and release the approriate resources
if requeue && qFound {
// If we're requeueing we release the resources but don't remove the
// reference.
queue.Readd(unacked.QueueName, unacked.Msg)
for _, rh := range rhs {
rh.ReleaseResources(unacked.Msg)
}
} else {
// If we aren't re-adding, remove the ref and all associated
// resources
err := channel.server.msgStore.RemoveRef(unacked.Msg, unacked.QueueName, rhs)
if err != nil {
return amqp.NewSoftError(500, err.Error(), 60, 120)
}
}
// Remove this unacked message from the ones
// we're waiting for acks on and ping the consumer
// since there might be a message available now
delete(channel.awaitingAcks, k)
if cFound {
consumer.Ping()
}
}
}
return nil
}
func (channel *Channel) recover(requeue bool) {
if requeue {
channel.ackLock.Lock()
defer channel.ackLock.Unlock()
// Requeue. Make sure we update stats
for _, unacked := range channel.awaitingAcks {
// re-add to queue
queue, qFound := channel.server.queues[unacked.QueueName]
if qFound {
queue.Readd(unacked.QueueName, unacked.Msg)
}
// else: The queue gone. The reference would have been removed
// then so we don't remove it now in an else clause
consumer, cFound := channel.consumers[unacked.ConsumerTag]
// decr channel active
channel.ReleaseResources(unacked.Msg)
// decr consumer active
if cFound {
consumer.ReleaseResources(unacked.Msg)
}
}
// Clear awaiting acks
channel.awaitingAcks = make(map[uint64]amqp.UnackedMessage)
} else {
// Redeliver. Don't need to mess with stats.
// We do this in a short-lived goroutine since this could end up
// blocking on sending to the network inside the consumer
go func() {
for tag, unacked := range channel.awaitingAcks {
consumer, cFound := channel.consumers[unacked.ConsumerTag]
if cFound {
// Consumer exists, try to deliver again
channel.server.msgStore.IncrDeliveryCount(unacked.QueueName, unacked.Msg)
consumer.Redeliver(tag, unacked.Msg)
} else {
// no consumer, drop message
var rhs = []amqp.MessageResourceHolder{
channel,
consumer,
}
channel.server.msgStore.RemoveRef(unacked.Msg, unacked.QueueName, rhs)
}
}
}()
}
}