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752f8c0f2f
The sha256 hash writer doesn't implement WriteString. (See https://github.com/golang/go/issues/38776.) As a consequence, we end up converting many strings to []byte. Wrapping a bufio.Writer around the hash writer lets us avoid these conversions by using WriteString. Using a bufio.Writer is, perhaps surprisingly, almost as cheap as using unsafe. The reason is that the sha256 writer does internal buffering, but doesn't do any when handed larger writers. Using a bufio.Writer merely shifts the data copying from one buffer to a different one. Using a concrete type for Print and print cuts 10% off of the execution time. name old time/op new time/op delta Hash-8 15.3µs ± 0% 11.5µs ± 0% -24.84% (p=0.000 n=10+10) name old alloc/op new alloc/op delta Hash-8 2.82kB ± 0% 1.98kB ± 0% -29.57% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Hash-8 140 ± 0% 82 ± 0% -41.43% (p=0.000 n=10+10) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
68 lines
1.3 KiB
Go
68 lines
1.3 KiB
Go
// 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 deepprint
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import (
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"testing"
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"inet.af/netaddr"
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"tailscale.com/wgengine/router"
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"tailscale.com/wgengine/wgcfg"
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)
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func TestDeepPrint(t *testing.T) {
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// v contains the types of values we care about for our current callers.
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// Mostly we're just testing that we don't panic on handled types.
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v := getVal()
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hash1 := Hash(v)
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t.Logf("hash: %v", hash1)
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for i := 0; i < 20; i++ {
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hash2 := Hash(getVal())
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if hash1 != hash2 {
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t.Error("second hash didn't match")
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}
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}
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}
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func getVal() []interface{} {
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return []interface{}{
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&wgcfg.Config{
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Name: "foo",
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Addresses: []netaddr.IPPrefix{{Bits: 5, IP: netaddr.IPFrom16([16]byte{3: 3})}},
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Peers: []wgcfg.Peer{
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{
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Endpoints: "foo:5",
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},
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},
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},
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&router.Config{
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Routes: []netaddr.IPPrefix{
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netaddr.MustParseIPPrefix("1.2.3.0/24"),
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netaddr.MustParseIPPrefix("1234::/64"),
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},
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},
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map[string]string{
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"key1": "val1",
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"key2": "val2",
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"key3": "val3",
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"key4": "val4",
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"key5": "val5",
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"key6": "val6",
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"key7": "val7",
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"key8": "val8",
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"key9": "val9",
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},
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}
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}
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func BenchmarkHash(b *testing.B) {
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b.ReportAllocs()
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v := getVal()
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for i := 0; i < b.N; i++ {
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Hash(v)
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}
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}
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