hugo/resources/page/page.go
Bjørn Erik Pedersen 7285e74090
all: Rework page store, add a dynacache, improve partial rebuilds, and some general spring cleaning
There are some breaking changes in this commit, see #11455.

Closes #11455
Closes #11549

This fixes a set of bugs (see issue list) and it is also paying some technical debt accumulated over the years. We now build with Staticcheck enabled in the CI build.

The performance should be about the same as before for regular sized Hugo sites, but it should perform and scale much better to larger data sets, as objects that uses lots of memory (e.g. rendered Markdown, big JSON files read into maps with transform.Unmarshal etc.) will now get automatically garbage collected if needed. Performance on partial rebuilds when running the server in fast render mode should be the same, but the change detection should be much more accurate.

A list of the notable new features:

* A new dependency tracker that covers (almost) all of Hugo's API and is used to do fine grained partial rebuilds when running the server.
* A new and simpler tree document store which allows fast lookups and prefix-walking in all dimensions (e.g. language) concurrently.
* You can now configure an upper memory limit allowing for much larger data sets and/or running on lower specced PCs.
We have lifted the "no resources in sub folders" restriction for branch bundles (e.g. sections).
Memory Limit
* Hugos will, by default, set aside a quarter of the total system memory, but you can set this via the OS environment variable HUGO_MEMORYLIMIT (in gigabytes). This is backed by a partitioned LRU cache used throughout Hugo. A cache that gets dynamically resized in low memory situations, allowing Go's Garbage Collector to free the memory.

New Dependency Tracker: Hugo has had a rule based coarse grained approach to server rebuilds that has worked mostly pretty well, but there have been some surprises (e.g. stale content). This is now revamped with a new dependency tracker that can quickly calculate the delta given a changed resource (e.g. a content file, template, JS file etc.). This handles transitive relations, e.g. $page -> js.Build -> JS import, or $page1.Content -> render hook -> site.GetPage -> $page2.Title, or $page1.Content -> shortcode -> partial -> site.RegularPages -> $page2.Content -> shortcode ..., and should also handle changes to aggregated values (e.g. site.Lastmod) effectively.

This covers all of Hugo's API with 2 known exceptions (a list that may not be fully exhaustive):

Changes to files loaded with template func os.ReadFile may not be handled correctly. We recommend loading resources with resources.Get
Changes to Hugo objects (e.g. Page) passed in the template context to lang.Translate may not be detected correctly. We recommend having simple i18n templates without too much data context passed in other than simple types such as strings and numbers.
Note that the cachebuster configuration (when A changes then rebuild B) works well with the above, but we recommend that you revise that configuration, as it in most situations should not be needed. One example where it is still needed is with TailwindCSS and using changes to hugo_stats.json to trigger new CSS rebuilds.

Document Store: Previously, a little simplified, we split the document store (where we store pages and resources) in a tree per language. This worked pretty well, but the structure made some operations harder than they needed to be. We have now restructured it into one Radix tree for all languages. Internally the language is considered to be a dimension of that tree, and the tree can be viewed in all dimensions concurrently. This makes some operations re. language simpler (e.g. finding translations is just a slice range), but the idea is that it should also be relatively inexpensive to add more dimensions if needed (e.g. role).

Fixes #10169
Fixes #10364
Fixes #10482
Fixes #10630
Fixes #10656
Fixes #10694
Fixes #10918
Fixes #11262
Fixes #11439
Fixes #11453
Fixes #11457
Fixes #11466
Fixes #11540
Fixes #11551
Fixes #11556
Fixes #11654
Fixes #11661
Fixes #11663
Fixes #11664
Fixes #11669
Fixes #11671
Fixes #11807
Fixes #11808
Fixes #11809
Fixes #11815
Fixes #11840
Fixes #11853
Fixes #11860
Fixes #11883
Fixes #11904
Fixes #7388
Fixes #7425
Fixes #7436
Fixes #7544
Fixes #7882
Fixes #7960
Fixes #8255
Fixes #8307
Fixes #8863
Fixes #8927
Fixes #9192
Fixes #9324
2024-01-27 16:28:14 +01:00

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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package page contains the core interfaces and types for the Page resource,
// a core component in Hugo.
package page
import (
"context"
"html/template"
"github.com/gohugoio/hugo/markup/converter"
"github.com/gohugoio/hugo/markup/tableofcontents"
"github.com/gohugoio/hugo/config"
"github.com/gohugoio/hugo/common/maps"
"github.com/gohugoio/hugo/common/paths"
"github.com/gohugoio/hugo/compare"
"github.com/gohugoio/hugo/navigation"
"github.com/gohugoio/hugo/related"
"github.com/gohugoio/hugo/resources/resource"
"github.com/gohugoio/hugo/source"
)
// Clear clears any global package state.
func Clear() error {
spc.clear()
return nil
}
// AlternativeOutputFormatsProvider provides alternative output formats for a
// Page.
type AlternativeOutputFormatsProvider interface {
// AlternativeOutputFormats gives the alternative output formats for the
// current output.
// Note that we use the term "alternative" and not "alternate" here, as it
// does not necessarily replace the other format, it is an alternative representation.
AlternativeOutputFormats() OutputFormats
}
// AuthorProvider provides author information.
type AuthorProvider interface {
// Deprecated.
Author() Author
// Deprecated.
Authors() AuthorList
}
// ChildCareProvider provides accessors to child resources.
type ChildCareProvider interface {
// Pages returns a list of pages of all kinds.
Pages() Pages
// RegularPages returns a list of pages of kind 'Page'.
RegularPages() Pages
// RegularPagesRecursive returns all regular pages below the current
// section.
RegularPagesRecursive() Pages
// Resources returns a list of all resources.
Resources() resource.Resources
}
// ContentProvider provides the content related values for a Page.
type ContentProvider interface {
Content(context.Context) (any, error)
// Plain returns the Page Content stripped of HTML markup.
Plain(context.Context) string
// PlainWords returns a string slice from splitting Plain using https://pkg.go.dev/strings#Fields.
PlainWords(context.Context) []string
// Summary returns a generated summary of the content.
// The breakpoint can be set manually by inserting a summary separator in the source file.
Summary(context.Context) template.HTML
// Truncated returns whether the Summary is truncated or not.
Truncated(context.Context) bool
// FuzzyWordCount returns the approximate number of words in the content.
FuzzyWordCount(context.Context) int
// WordCount returns the number of words in the content.
WordCount(context.Context) int
// ReadingTime returns the reading time based on the length of plain text.
ReadingTime(context.Context) int
// Len returns the length of the content.
// This is for internal use only.
Len(context.Context) int
}
// ContentRenderer provides the content rendering methods for some content.
type ContentRenderer interface {
// ParseAndRenderContent renders the given content.
// For internal use only.
ParseAndRenderContent(ctx context.Context, content []byte, enableTOC bool) (converter.ResultRender, error)
// For internal use only.
ParseContent(ctx context.Context, content []byte) (converter.ResultParse, bool, error)
// For internal use only.
RenderContent(ctx context.Context, content []byte, doc any) (converter.ResultRender, bool, error)
}
// FileProvider provides the source file.
type FileProvider interface {
// File returns the source file for this Page,
// or a zero File if this Page is not backed by a file.
File() *source.File
}
// GetPageProvider provides the GetPage method.
type GetPageProvider interface {
// GetPage looks up a page for the given ref.
// {{ with .GetPage "blog" }}{{ .Title }}{{ end }}
//
// This will return nil when no page could be found, and will return
// an error if the ref is ambiguous.
GetPage(ref string) (Page, error)
}
// GitInfoProvider provides Git info.
type GitInfoProvider interface {
// GitInfo returns the Git info for this object.
GitInfo() source.GitInfo
// CodeOwners returns the code owners for this object.
CodeOwners() []string
}
// InSectionPositioner provides section navigation.
type InSectionPositioner interface {
// NextInSection returns the next page in the same section.
NextInSection() Page
// PrevInSection returns the previous page in the same section.
PrevInSection() Page
}
// InternalDependencies is considered an internal interface.
type InternalDependencies interface {
// GetRelatedDocsHandler is for internal use only.
GetRelatedDocsHandler() *RelatedDocsHandler
}
// OutputFormatsProvider provides the OutputFormats of a Page.
type OutputFormatsProvider interface {
// OutputFormats returns the OutputFormats for this Page.
OutputFormats() OutputFormats
}
// PageProvider provides access to a Page.
// Implemented by shortcodes and others.
type PageProvider interface {
Page() Page
}
// Page is the core interface in Hugo and what you get as the top level data context in your templates.
type Page interface {
ContentProvider
TableOfContentsProvider
PageWithoutContent
}
type PageFragment interface {
resource.ResourceLinksProvider
resource.ResourceNameTitleProvider
}
// PageMetaProvider provides page metadata, typically provided via front matter.
type PageMetaProvider interface {
// The 4 page dates
resource.Dated
// Aliases forms the base for redirects generation.
Aliases() []string
// BundleType returns the bundle type: `leaf`, `branch` or an empty string.
BundleType() string
// A configured description.
Description() string
// Whether this is a draft. Will only be true if run with the --buildDrafts (-D) flag.
Draft() bool
// IsHome returns whether this is the home page.
IsHome() bool
// Configured keywords.
Keywords() []string
// The Page Kind. One of page, home, section, taxonomy, term.
Kind() string
// The configured layout to use to render this page. Typically set in front matter.
Layout() string
// The title used for links.
LinkTitle() string
// IsNode returns whether this is an item of one of the list types in Hugo,
// i.e. not a regular content
IsNode() bool
// IsPage returns whether this is a regular content
IsPage() bool
// Param looks for a param in Page and then in Site config.
Param(key any) (any, error)
// Path gets the relative path, including file name and extension if relevant,
// to the source of this Page. It will be relative to any content root.
Path() string
// This is for internal use only.
PathInfo() *paths.Path
// The slug, typically defined in front matter.
Slug() string
// This page's language code. Will be the same as the site's.
Lang() string
// IsSection returns whether this is a section
IsSection() bool
// Section returns the first path element below the content root.
Section() string
// Sitemap returns the sitemap configuration for this page.
// This is for internal use only.
Sitemap() config.SitemapConfig
// Type is a discriminator used to select layouts etc. It is typically set
// in front matter, but will fall back to the root section.
Type() string
// The configured weight, used as the first sort value in the default
// page sort if non-zero.
Weight() int
}
// PageRenderProvider provides a way for a Page to render content.
type PageRenderProvider interface {
// Render renders the given layout with this Page as context.
Render(ctx context.Context, layout ...string) (template.HTML, error)
// RenderString renders the first value in args with tPaginatorhe content renderer defined
// for this Page.
// It takes an optional map as a second argument:
//
// display (“inline”):
// - inline or block. If inline (default), surrounding <p></p> on short snippets will be trimmed.
// markup (defaults to the Pages markup)
RenderString(ctx context.Context, args ...any) (template.HTML, error)
}
// PageWithoutContent is the Page without any of the content methods.
type PageWithoutContent interface {
RawContentProvider
RenderShortcodesProvider
resource.Resource
PageMetaProvider
resource.LanguageProvider
// For pages backed by a file.
FileProvider
GitInfoProvider
// Output formats
OutputFormatsProvider
AlternativeOutputFormatsProvider
// Tree navigation
ChildCareProvider
TreeProvider
// Horizontal navigation
InSectionPositioner
PageRenderProvider
PaginatorProvider
Positioner
navigation.PageMenusProvider
// TODO(bep)
AuthorProvider
// Page lookups/refs
GetPageProvider
RefProvider
resource.TranslationKeyProvider
TranslationsProvider
SitesProvider
// Helper methods
ShortcodeInfoProvider
compare.Eqer
// Scratch returns a Scratch that can be used to store temporary state.
// Note that this Scratch gets reset on server rebuilds. See Store() for a variant that survives.
maps.Scratcher
// Store returns a Scratch that can be used to store temporary state.
// In contrast to Scratch(), this Scratch is not reset on server rebuilds.
Store() *maps.Scratch
RelatedKeywordsProvider
// GetTerms gets the terms of a given taxonomy,
// e.g. GetTerms("categories")
GetTerms(taxonomy string) Pages
// HeadingsFiltered returns the headings for this page when a filter is set.
// This is currently only triggered with the Related content feature
// and the "fragments" type of index.
HeadingsFiltered(context.Context) tableofcontents.Headings
}
// Positioner provides next/prev navigation.
type Positioner interface {
// Next points up to the next regular page (sorted by Hugos default sort).
Next() Page
// Prev points down to the previous regular page (sorted by Hugos default sort).
Prev() Page
// Deprecated: Use Prev. Will be removed in Hugo 0.57
PrevPage() Page
// Deprecated: Use Next. Will be removed in Hugo 0.57
NextPage() Page
}
// RawContentProvider provides the raw, unprocessed content of the page.
type RawContentProvider interface {
// RawContent returns the raw, unprocessed content of the page excluding any front matter.
RawContent() string
}
type RenderShortcodesProvider interface {
// RenderShortcodes returns RawContent with any shortcodes rendered.
RenderShortcodes(context.Context) (template.HTML, error)
}
// RefProvider provides the methods needed to create reflinks to pages.
type RefProvider interface {
// Ref returns an absolute URl to a page.
Ref(argsm map[string]any) (string, error)
// RefFrom is for internal use only.
RefFrom(argsm map[string]any, source any) (string, error)
// RelRef returns a relative URL to a page.
RelRef(argsm map[string]any) (string, error)
// RelRefFrom is for internal use only.
RelRefFrom(argsm map[string]any, source any) (string, error)
}
// RelatedKeywordsProvider allows a Page to be indexed.
type RelatedKeywordsProvider interface {
// Make it indexable as a related.Document
// RelatedKeywords is meant for internal usage only.
RelatedKeywords(cfg related.IndexConfig) ([]related.Keyword, error)
}
// ShortcodeInfoProvider provides info about the shortcodes in a Page.
type ShortcodeInfoProvider interface {
// HasShortcode return whether the page has a shortcode with the given name.
// This method is mainly motivated with the Hugo Docs site's need for a list
// of pages with the `todo` shortcode in it.
HasShortcode(name string) bool
}
// SitesProvider provide accessors to get sites.
type SitesProvider interface {
// Site returns the current site.
Site() Site
// Sites returns all sites.
Sites() Sites
}
// TableOfContentsProvider provides the table of contents for a Page.
type TableOfContentsProvider interface {
// TableOfContents returns the table of contents for the page rendered as HTML.
TableOfContents(context.Context) template.HTML
// Fragments returns the fragments for this page.
Fragments(context.Context) *tableofcontents.Fragments
}
// TranslationsProvider provides access to any translations.
type TranslationsProvider interface {
// IsTranslated returns whether this content file is translated to
// other language(s).
IsTranslated() bool
// AllTranslations returns all translations, including the current Page.
AllTranslations() Pages
// Translations returns the translations excluding the current Page.
Translations() Pages
}
// TreeProvider provides section tree navigation.
type TreeProvider interface {
// IsAncestor returns whether the current page is an ancestor of other.
// Note that this method is not relevant for taxonomy lists and taxonomy terms pages.
IsAncestor(other any) bool
// CurrentSection returns the page's current section or the page itself if home or a section.
// Note that this will return nil for pages that is not regular, home or section pages.
CurrentSection() Page
// IsDescendant returns whether the current page is a descendant of other.
// Note that this method is not relevant for taxonomy lists and taxonomy terms pages.
IsDescendant(other any) bool
// FirstSection returns the section on level 1 below home, e.g. "/docs".
// For the home page, this will return itself.
FirstSection() Page
// InSection returns whether other is in the current section.
// Note that this will always return false for pages that are
// not either regular, home or section pages.
InSection(other any) bool
// Parent returns a section's parent section or a page's section.
// To get a section's subsections, see Page's Sections method.
Parent() Page
// Ancestors returns the ancestors of each page
Ancestors() Pages
// Sections returns this section's subsections, if any.
// Note that for non-sections, this method will always return an empty list.
Sections() Pages
// Page returns a reference to the Page itself, kept here mostly
// for legacy reasons.
Page() Page
// Returns a slice of sections (directories if it's a file) to this
// Page.
SectionsEntries() []string
// SectionsPath is SectionsEntries joined with a /.
SectionsPath() string
}
// PageWithContext is a Page with a context.Context.
type PageWithContext struct {
Page
Ctx context.Context
}
func (p PageWithContext) Content() (any, error) {
return p.Page.Content(p.Ctx)
}
func (p PageWithContext) Plain() string {
return p.Page.Plain(p.Ctx)
}
func (p PageWithContext) PlainWords() []string {
return p.Page.PlainWords(p.Ctx)
}
func (p PageWithContext) Summary() template.HTML {
return p.Page.Summary(p.Ctx)
}
func (p PageWithContext) Truncated() bool {
return p.Page.Truncated(p.Ctx)
}
func (p PageWithContext) FuzzyWordCount() int {
return p.Page.FuzzyWordCount(p.Ctx)
}
func (p PageWithContext) WordCount() int {
return p.Page.WordCount(p.Ctx)
}
func (p PageWithContext) ReadingTime() int {
return p.Page.ReadingTime(p.Ctx)
}
func (p PageWithContext) Len() int {
return p.Page.Len(p.Ctx)
}