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derp: use pad32 package for padding, reduce duplication 

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-08-04 14:43:01 -07:00
parent fdc081c291
commit fd7b738e5b
3 changed files with 6 additions and 10 deletions
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1
cmd/tailscale/depaware.txt
View File

@ -57,6 +57,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
tailscale.com/types/logger from tailscale.com/cmd/tailscale/cli+
tailscale.com/types/netmap from tailscale.com/ipn
tailscale.com/types/opt from tailscale.com/net/netcheck+
tailscale.com/types/pad32 from tailscale.com/derp
tailscale.com/types/persist from tailscale.com/ipn
tailscale.com/types/preftype from tailscale.com/cmd/tailscale/cli+
tailscale.com/types/structs from tailscale.com/ipn+

1
cmd/tailscaled/depaware.txt
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@ -140,6 +140,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/types/netmap from tailscale.com/control/controlclient+
tailscale.com/types/nettype from tailscale.com/wgengine/magicsock
tailscale.com/types/opt from tailscale.com/control/controlclient+
tailscale.com/types/pad32 from tailscale.com/derp
tailscale.com/types/persist from tailscale.com/control/controlclient+
tailscale.com/types/preftype from tailscale.com/ipn+
tailscale.com/types/structs from tailscale.com/control/controlclient+

14
derp/derp_server.go
View File

@ -43,6 +43,7 @@ import (
"tailscale.com/metrics"
"tailscale.com/types/key"
"tailscale.com/types/logger"
"tailscale.com/types/pad32"
"tailscale.com/version"
)
@ -76,13 +77,6 @@ const (
writeTimeout = 2 * time.Second
)
const host64bit = (^uint(0) >> 32) & 1 // 1 on 64-bit, 0 on 32-bit
// pad32bit is 4 on 32-bit machines and 0 on 64-bit.
// It exists so the Server struct's atomic fields can be aligned to 8
// byte boundaries. (As tested by GOARCH=386 go test, etc)
const pad32bit = 4 - host64bit*4 // 0 on 64-bit, 4 on 32-bit
// Server is a DERP server.
type Server struct {
// WriteTimeout, if non-zero, specifies how long to wait
@ -98,20 +92,20 @@ type Server struct {
metaCert []byte // the encoded x509 cert to send after LetsEncrypt cert+intermediate
// Counters:
_ [pad32bit]byte
_ pad32.Four
packetsSent, bytesSent expvar.Int
packetsRecv, bytesRecv expvar.Int
packetsRecvByKind metrics.LabelMap
packetsRecvDisco *expvar.Int
packetsRecvOther *expvar.Int
_ [pad32bit]byte
_ pad32.Four
packetsDropped expvar.Int
packetsDroppedReason metrics.LabelMap
packetsDroppedReasonCounters []*expvar.Int // indexed by dropReason
packetsDroppedType metrics.LabelMap
packetsDroppedTypeDisco *expvar.Int
packetsDroppedTypeOther *expvar.Int
_ [pad32bit]byte
_ pad32.Four
packetsForwardedOut expvar.Int
packetsForwardedIn expvar.Int
peerGoneFrames expvar.Int // number of peer gone frames sent