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device: change logging interface to use functions

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This commit overhauls wireguard-go's logging.

The primary, motivating change is to use a function instead
of a *log.Logger as the basic unit of logging.
Using functions provides a lot more flexibility for
people to bring their own logging system.

It also introduces logging helper methods on Device.
These reduce line noise at the call site.
They also allow for log functions to be nil;
when nil, instead of generating a log line and throwing it away,
we don't bother generating it at all.
This spares allocation and pointless work.

This is a breaking change, although the fix required
of clients is fairly straightforward.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder
2021-01-22 14:11:17 -08:00
committed by Jason A. Donenfeld
parent 37efdcaccf
commit 7139279cd0
11 changed files with 147 additions and 182 deletions
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4
device/noise-protocol.go
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@@ -319,11 +319,11 @@ func (device *Device) ConsumeMessageInitiation(msg *MessageInitiation) *Peer {
flood := time.Since(handshake.lastInitiationConsumption) <= HandshakeInitationRate
handshake.mutex.RUnlock()
if replay {
device.log.Debug.Printf("%v - ConsumeMessageInitiation: handshake replay @ %v\n", peer, timestamp)
device.debugf("%v - ConsumeMessageInitiation: handshake replay @ %v", peer, timestamp)
return nil
}
if flood {
device.log.Debug.Printf("%v - ConsumeMessageInitiation: handshake flood\n", peer)
device.debugf("%v - ConsumeMessageInitiation: handshake flood", peer)
return nil
}