mirror of https://github.com/tailscale/tailscale/
net/packet: use netaddr AppendTo methods
This lets us remote the types/strbuilder package, which had only a single user. And it's faster. name old time/op new time/op delta String/tcp4-8 175ns ± 0% 58ns ± 1% -66.95% (p=0.000 n=10+9) String/tcp6-8 226ns ± 1% 136ns ± 1% -39.85% (p=0.000 n=10+10) String/udp4-8 175ns ± 1% 58ns ± 1% -67.01% (p=0.000 n=10+9) String/udp6-8 230ns ± 1% 140ns ± 0% -39.32% (p=0.000 n=10+9) String/icmp4-8 164ns ± 0% 50ns ± 1% -69.89% (p=0.000 n=10+10) String/icmp6-8 217ns ± 1% 129ns ± 0% -40.46% (p=0.000 n=10+10) String/igmp-8 196ns ± 0% 56ns ± 1% -71.32% (p=0.000 n=10+10) String/unknown-8 2.06ns ± 1% 2.06ns ± 2% ~ (p=0.985 n=10+10) name old alloc/op new alloc/op delta String/tcp4-8 32.0B ± 0% 32.0B ± 0% ~ (all equal) String/tcp6-8 168B ± 0% 96B ± 0% -42.86% (p=0.000 n=10+10) String/udp4-8 32.0B ± 0% 32.0B ± 0% ~ (all equal) String/udp6-8 168B ± 0% 96B ± 0% -42.86% (p=0.000 n=10+10) String/icmp4-8 32.0B ± 0% 32.0B ± 0% ~ (all equal) String/icmp6-8 104B ± 0% 64B ± 0% -38.46% (p=0.000 n=10+10) String/igmp-8 48.0B ± 0% 48.0B ± 0% ~ (all equal) String/unknown-8 0.00B 0.00B ~ (all equal) name old allocs/op new allocs/op delta String/tcp4-8 1.00 ± 0% 1.00 ± 0% ~ (all equal) String/tcp6-8 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.000 n=10+10) String/udp4-8 1.00 ± 0% 1.00 ± 0% ~ (all equal) String/udp6-8 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.000 n=10+10) String/icmp4-8 1.00 ± 0% 1.00 ± 0% ~ (all equal) String/icmp6-8 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.000 n=10+10) String/igmp-8 1.00 ± 0% 1.00 ± 0% ~ (all equal) String/unknown-8 0.00 0.00 ~ (all equal) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>pull/1978/head
Josh Bleecher Snyder
4 years ago
committed by
Josh Bleecher Snyder
parent
d6d1951897
commit
5666663370
@ -1,74 +0,0 @@
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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package strbuilder defines a string builder type that allocates
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// less than the standard library's strings.Builder by using a
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// sync.Pool, so it doesn't matter if the compiler can't prove that
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// the builder doesn't escape into the fmt package, etc.
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package strbuilder
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import (
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"bytes"
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"strconv"
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"sync"
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)
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var pool = sync.Pool{
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New: func() interface{} { return new(Builder) },
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}
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type Builder struct {
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bb bytes.Buffer
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scratch [20]byte // long enough for MinInt64, MaxUint64
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locked bool // in pool, not for use
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}
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// Get returns a new or reused string Builder.
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func Get() *Builder {
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b := pool.Get().(*Builder)
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b.bb.Reset()
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b.locked = false
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return b
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}
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// String both returns the Builder's string, and returns the builder
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// to the pool.
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func (b *Builder) String() string {
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if b.locked {
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panic("String called twiced on Builder")
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}
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s := b.bb.String()
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b.locked = true
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pool.Put(b)
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return s
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}
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func (b *Builder) WriteByte(v byte) error {
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return b.bb.WriteByte(v)
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}
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func (b *Builder) WriteString(s string) (int, error) {
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return b.bb.WriteString(s)
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}
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func (b *Builder) Write(p []byte) (int, error) {
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return b.bb.Write(p)
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}
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func (b *Builder) WriteInt(v int64) {
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b.Write(strconv.AppendInt(b.scratch[:0], v, 10))
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}
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func (b *Builder) WriteUint(v uint64) {
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b.Write(strconv.AppendUint(b.scratch[:0], v, 10))
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}
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// Grow grows the buffer's capacity, if necessary, to guarantee space
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// for another n bytes. After Grow(n), at least n bytes can be written
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// to the buffer without another allocation. If n is negative, Grow
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// will panic. If the buffer can't grow it will panic with
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// ErrTooLarge.
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func (b *Builder) Grow(n int) {
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b.bb.Grow(n)
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}
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@ -1,52 +0,0 @@
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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package strbuilder
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import (
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"math"
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"testing"
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)
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func TestBuilder(t *testing.T) {
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const want = "Hello, world 123 -456!"
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bang := []byte("!")
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var got string
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allocs := testing.AllocsPerRun(1000, func() {
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sb := Get()
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sb.WriteString("Hello, world ")
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sb.WriteUint(123)
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sb.WriteByte(' ')
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sb.WriteInt(-456)
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sb.Write(bang)
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got = sb.String()
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})
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if got != want {
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t.Errorf("got %q; want %q", got, want)
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}
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if allocs != 1 {
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t.Errorf("allocs = %v; want 1", allocs)
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}
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}
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// Verifies scratch buf is large enough.
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func TestIntBounds(t *testing.T) {
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const want = "-9223372036854775808 9223372036854775807 18446744073709551615"
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var got string
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allocs := testing.AllocsPerRun(1000, func() {
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sb := Get()
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sb.WriteInt(math.MinInt64)
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sb.WriteByte(' ')
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sb.WriteInt(math.MaxInt64)
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sb.WriteByte(' ')
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sb.WriteUint(math.MaxUint64)
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got = sb.String()
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})
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if got != want {
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t.Errorf("got %q; want %q", got, want)
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}
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if allocs != 1 {
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t.Errorf("allocs = %v; want 1", allocs)
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}
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}
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