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device: remove selects from encrypt/decrypt/inbound/outbound enqueuing

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Block instead. Backpressure here is fine, probably preferable.
This reduces code complexity.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2021-01-11 17:21:16 -08:00 committed by Jason A. Donenfeld
parent 0cc15e7c7c
commit 2fe19ce54d
2 changed files with 5 additions and 38 deletions
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23
device/receive.go
View File

@ -58,23 +58,6 @@ func (elem *QueueInboundElement) IsDropped() bool {
return atomic.LoadInt32(&elem.dropped) == AtomicTrue
}
func (device *Device) addToInboundAndDecryptionQueues(inboundQueue chan *QueueInboundElement, decryptionQueue chan *QueueInboundElement, elem *QueueInboundElement) bool {
select {
case inboundQueue <- elem:
select {
case decryptionQueue <- elem:
return true
default:
elem.Drop()
elem.Unlock()
return false
}
default:
device.PutInboundElement(elem)
return false
}
}
func (device *Device) addToHandshakeQueue(queue chan QueueHandshakeElement, elem QueueHandshakeElement) bool {
select {
case queue <- elem:
@ -207,9 +190,9 @@ func (device *Device) RoutineReceiveIncoming(IP int, bind conn.Bind) {
peer.queue.RLock()
if peer.isRunning.Get() {
if device.addToInboundAndDecryptionQueues(peer.queue.inbound, device.queue.decryption.c, elem) {
buffer = device.GetMessageBuffer()
}
peer.queue.inbound <- elem
device.queue.decryption.c <- elem
buffer = device.GetMessageBuffer()
} else {
device.PutInboundElement(elem)
}

20
device/send.go
View File

@ -97,23 +97,6 @@ func addToNonceQueue(queue chan *QueueOutboundElement, elem *QueueOutboundElemen
}
}
func addToOutboundAndEncryptionQueues(outboundQueue chan *QueueOutboundElement, encryptionQueue chan *QueueOutboundElement, elem *QueueOutboundElement) {
select {
case outboundQueue <- elem:
select {
case encryptionQueue <- elem:
return
default:
elem.Drop()
elem.peer.device.PutMessageBuffer(elem.buffer)
elem.Unlock()
}
default:
elem.peer.device.PutMessageBuffer(elem.buffer)
elem.peer.device.PutOutboundElement(elem)
}
}
/* Queues a keepalive if no packets are queued for peer
*/
func (peer *Peer) SendKeepalive() bool {
@ -457,7 +440,8 @@ NextPacket:
elem.Lock()
// add to parallel and sequential queue
addToOutboundAndEncryptionQueues(peer.queue.outbound, device.queue.encryption.c, elem)
peer.queue.outbound <- elem
device.queue.encryption.c <- elem
}
}
}