2babd6404e
``` name old time/op new time/op delta HashString/n28-10 133ns ± 9% 107ns ±10% -19.58% (p=0.029 n=4+4) HashString/n112-10 243ns ± 5% 121ns ± 4% -50.08% (p=0.029 n=4+4) HashString/n448-10 698ns ± 3% 174ns ± 5% -75.02% (p=0.029 n=4+4) HashString/n1792-10 2.58µs ± 4% 0.38µs ± 4% -85.11% (p=0.029 n=4+4) HashString/n7168-10 10.0µs ± 3% 1.3µs ± 4% -86.91% (p=0.029 n=4+4) name old alloc/op new alloc/op delta HashString/n28-10 80.0B ± 0% 72.0B ± 0% -10.00% (p=0.029 n=4+4) HashString/n112-10 160B ± 0% 152B ± 0% -5.00% (p=0.029 n=4+4) HashString/n448-10 496B ± 0% 488B ± 0% -1.61% (p=0.029 n=4+4) HashString/n1792-10 1.84kB ± 0% 1.83kB ± 0% -0.43% (p=0.029 n=4+4) HashString/n7168-10 8.24kB ± 0% 8.23kB ± 0% -0.06% (p=0.029 n=4+4) name old allocs/op new allocs/op delta HashString/n28-10 4.00 ± 0% 3.00 ± 0% -25.00% (p=0.029 n=4+4) HashString/n112-10 4.00 ± 0% 3.00 ± 0% -25.00% (p=0.029 n=4+4) HashString/n448-10 4.00 ± 0% 3.00 ± 0% -25.00% (p=0.029 n=4+4) HashString/n1792-10 4.00 ± 0% 3.00 ± 0% -25.00% (p=0.029 n=4+4) HashString/n7168-10 4.00 ± 0% 3.00 ± 0% -25.00% (p=0.029 n=4+4) ```
91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
// Copyright 2024 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package identity
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import (
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"strconv"
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"sync"
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"github.com/cespare/xxhash/v2"
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"github.com/mitchellh/hashstructure/v2"
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)
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// HashString returns a hash from the given elements.
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// It will panic if the hash cannot be calculated.
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// Note that this hash should be used primarily for identity, not for change detection as
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// it in the more complex values (e.g. Page) will not hash the full content.
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func HashString(vs ...any) string {
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hash := HashUint64(vs...)
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return strconv.FormatUint(hash, 10)
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}
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var hashOptsPool = sync.Pool{
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New: func() any {
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return &hashstructure.HashOptions{
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Hasher: xxhash.New(),
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}
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},
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}
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func getHashOpts() *hashstructure.HashOptions {
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return hashOptsPool.Get().(*hashstructure.HashOptions)
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}
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func putHashOpts(opts *hashstructure.HashOptions) {
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opts.Hasher.Reset()
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hashOptsPool.Put(opts)
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}
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// HashUint64 returns a hash from the given elements.
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// It will panic if the hash cannot be calculated.
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// Note that this hash should be used primarily for identity, not for change detection as
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// it in the more complex values (e.g. Page) will not hash the full content.
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func HashUint64(vs ...any) uint64 {
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var o any
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if len(vs) == 1 {
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o = toHashable(vs[0])
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} else {
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elements := make([]any, len(vs))
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for i, e := range vs {
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elements[i] = toHashable(e)
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}
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o = elements
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}
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hashOpts := getHashOpts()
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defer putHashOpts(hashOpts)
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hash, err := hashstructure.Hash(o, hashstructure.FormatV2, hashOpts)
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if err != nil {
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panic(err)
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}
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return hash
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}
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type keyer interface {
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Key() string
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}
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// For structs, hashstructure.Hash only works on the exported fields,
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// so rewrite the input slice for known identity types.
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func toHashable(v any) any {
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switch t := v.(type) {
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case keyer:
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return t.Key()
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case IdentityProvider:
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return t.GetIdentity()
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default:
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return v
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}
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}
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