mirror of https://github.com/gohugoio/hugo.git
62 lines
2.0 KiB
Go
62 lines
2.0 KiB
Go
// Copyright 2019 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 internal
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import (
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"strconv"
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bp "github.com/gohugoio/hugo/bufferpool"
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"github.com/mitchellh/hashstructure"
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)
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// ResourceTransformationKey are provided by the different transformation implementations.
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// It identifies the transformation (name) and its configuration (elements).
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// We combine this in a chain with the rest of the transformations
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// with the target filename and a content hash of the origin to use as cache key.
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type ResourceTransformationKey struct {
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Name string
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elements []interface{}
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}
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// NewResourceTransformationKey creates a new ResourceTransformationKey from the transformation
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// name and elements. We will create a 64 bit FNV hash from the elements, which when combined
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// with the other key elements should be unique for all practical applications.
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func NewResourceTransformationKey(name string, elements ...interface{}) ResourceTransformationKey {
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return ResourceTransformationKey{Name: name, elements: elements}
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}
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// Value returns the Key as a string.
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// Do not change this without good reasons.
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func (k ResourceTransformationKey) Value() string {
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if len(k.elements) == 0 {
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return k.Name
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}
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sb := bp.GetBuffer()
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defer bp.PutBuffer(sb)
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sb.WriteString(k.Name)
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for _, element := range k.elements {
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hash, err := hashstructure.Hash(element, nil)
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if err != nil {
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panic(err)
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}
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sb.WriteString("_")
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sb.WriteString(strconv.FormatUint(hash, 10))
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}
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return sb.String()
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}
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