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device: avoid hex allocations in IpcGet

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benchmark               old ns/op     new ns/op     delta
BenchmarkUAPIGet-16     2872          2157          -24.90%

benchmark               old allocs     new allocs     delta
BenchmarkUAPIGet-16     30             18             -40.00%

benchmark               old bytes     new bytes     delta
BenchmarkUAPIGet-16     737           256           -65.26%

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
2021-01-28 00:49:31 +01:00
parent d4725bc456
commit 34c047c762
2 changed files with 14 additions and 15 deletions
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17
device/uapi.go
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@@ -57,6 +57,17 @@ func (device *Device) IpcGetOperation(w io.Writer) error {
fmt.Fprintf(buf, format, args...)
buf.WriteByte('\n')
}
keyf := func(prefix string, key *[32]byte) {
buf.Grow(len(key)*2 + 2 + len(prefix))
buf.WriteString(prefix)
buf.WriteByte('=')
const hex = "0123456789abcdef"
for i := 0; i < len(key); i++ {
buf.WriteByte(hex[key[i]>>4])
buf.WriteByte(hex[key[i]&0xf])
}
buf.WriteByte('\n')
}
func() {
@@ -74,7 +85,7 @@ func (device *Device) IpcGetOperation(w io.Writer) error {
// serialize device related values
if !device.staticIdentity.privateKey.IsZero() {
sendf("private_key=%s", device.staticIdentity.privateKey.ToHex())
keyf("private_key", (*[32]byte)(&device.staticIdentity.privateKey))
}
if device.net.port != 0 {
@@ -91,8 +102,8 @@ func (device *Device) IpcGetOperation(w io.Writer) error {
peer.RLock()
defer peer.RUnlock()
sendf("public_key=%s", peer.handshake.remoteStatic.ToHex())
sendf("preshared_key=%s", peer.handshake.presharedKey.ToHex())
keyf("public_key", (*[32]byte)(&peer.handshake.remoteStatic))
keyf("preshared_key", (*[32]byte)(&peer.handshake.presharedKey))
sendf("protocol_version=1")
if peer.endpoint != nil {
sendf("endpoint=%s", peer.endpoint.DstToString())