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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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20
device/send.go
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@@ -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
}
}
}