hugo/hugofs/fs.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

251 lines
6.8 KiB
Go

// 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 hugofs provides the file systems used by Hugo.
package hugofs
import (
"fmt"
"os"
"strings"
"github.com/bep/overlayfs"
"github.com/gohugoio/hugo/common/paths"
"github.com/gohugoio/hugo/config"
"github.com/spf13/afero"
)
// Os points to the (real) Os filesystem.
var Os = &afero.OsFs{}
// Fs holds the core filesystems used by Hugo.
type Fs struct {
// Source is Hugo's source file system.
// Note that this will always be a "plain" Afero filesystem:
// * afero.OsFs when running in production
// * afero.MemMapFs for many of the tests.
Source afero.Fs
// PublishDir is where Hugo publishes its rendered content.
// It's mounted inside publishDir (default /public).
PublishDir afero.Fs
// PublishDirStatic is the file system used for static files.
PublishDirStatic afero.Fs
// PublishDirServer is the file system used for serving the public directory with Hugo's development server.
// This will typically be the same as PublishDir, but not if --renderStaticToDisk is set.
PublishDirServer afero.Fs
// Os is an OS file system.
// NOTE: Field is currently unused.
Os afero.Fs
// WorkingDirReadOnly is a read-only file system
// restricted to the project working dir.
WorkingDirReadOnly afero.Fs
// WorkingDirWritable is a writable file system
// restricted to the project working dir.
WorkingDirWritable afero.Fs
}
func NewDefault(cfg config.Provider) *Fs {
workingDir, publishDir := getWorkingPublishDir(cfg)
fs := Os
return newFs(fs, fs, workingDir, publishDir)
}
// NewFrom creates a new Fs based on the provided Afero Fs
// as source and destination file systems.
// Useful for testing.
func NewFrom(fs afero.Fs, conf config.BaseConfig) *Fs {
return newFs(fs, fs, conf.WorkingDir, conf.PublishDir)
}
func NewFromOld(fs afero.Fs, cfg config.Provider) *Fs {
workingDir, publishDir := getWorkingPublishDir(cfg)
return newFs(fs, fs, workingDir, publishDir)
}
// NewFromSourceAndDestination creates a new Fs based on the provided Afero Fss
// as the source and destination file systems.
func NewFromSourceAndDestination(source, destination afero.Fs, cfg config.Provider) *Fs {
workingDir, publishDir := getWorkingPublishDir(cfg)
return newFs(source, destination, workingDir, publishDir)
}
func getWorkingPublishDir(cfg config.Provider) (string, string) {
workingDir := cfg.GetString("workingDir")
publishDir := cfg.GetString("publishDirDynamic")
if publishDir == "" {
publishDir = cfg.GetString("publishDir")
}
return workingDir, publishDir
}
func newFs(source, destination afero.Fs, workingDir, publishDir string) *Fs {
if publishDir == "" {
panic("publishDir is empty")
}
if workingDir == "." {
workingDir = ""
}
// Sanity check
if IsOsFs(source) && len(workingDir) < 2 {
panic("workingDir is too short")
}
// If this does not exist, it will be created later.
absPublishDir := paths.AbsPathify(workingDir, publishDir)
pubFs := NewBasePathFs(destination, absPublishDir)
return &Fs{
Source: source,
PublishDir: pubFs,
PublishDirServer: pubFs,
PublishDirStatic: pubFs,
Os: &afero.OsFs{},
WorkingDirReadOnly: getWorkingDirFsReadOnly(source, workingDir),
WorkingDirWritable: getWorkingDirFsWritable(source, workingDir),
}
}
func getWorkingDirFsReadOnly(base afero.Fs, workingDir string) afero.Fs {
if workingDir == "" {
return NewReadOnlyFs(base)
}
return NewBasePathFs(NewReadOnlyFs(base), workingDir)
}
func getWorkingDirFsWritable(base afero.Fs, workingDir string) afero.Fs {
if workingDir == "" {
return base
}
return NewBasePathFs(base, workingDir)
}
func isWrite(flag int) bool {
return flag&os.O_RDWR != 0 || flag&os.O_WRONLY != 0
}
// MakeReadableAndRemoveAllModulePkgDir makes any subdir in dir readable and then
// removes the root.
// TODO(bep) move this to a more suitable place.
func MakeReadableAndRemoveAllModulePkgDir(fs afero.Fs, dir string) (int, error) {
// Safe guard
if !strings.Contains(dir, "pkg") {
panic(fmt.Sprint("invalid dir:", dir))
}
counter := 0
afero.Walk(fs, dir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return nil
}
if info.IsDir() {
counter++
fs.Chmod(path, 0o777)
}
return nil
})
return counter, fs.RemoveAll(dir)
}
// IsOsFs returns whether fs is an OsFs or if it fs wraps an OsFs.
// TODO(bep) make this more robust.
func IsOsFs(fs afero.Fs) bool {
var isOsFs bool
WalkFilesystems(fs, func(fs afero.Fs) bool {
switch fs.(type) {
case *afero.MemMapFs:
isOsFs = false
case *afero.OsFs:
isOsFs = true
}
return isOsFs
})
return isOsFs
}
// FilesystemsUnwrapper returns the underlying filesystems.
type FilesystemsUnwrapper interface {
UnwrapFilesystems() []afero.Fs
}
// FilesystemUnwrapper returns the underlying filesystem.
type FilesystemUnwrapper interface {
UnwrapFilesystem() afero.Fs
}
// WalkFn is the walk func for WalkFilesystems.
type WalkFn func(fs afero.Fs) bool
// WalkFilesystems walks fs recursively and calls fn.
// If fn returns true, walking is stopped.
func WalkFilesystems(fs afero.Fs, fn WalkFn) bool {
if fn(fs) {
return true
}
if afs, ok := fs.(FilesystemUnwrapper); ok {
if WalkFilesystems(afs.UnwrapFilesystem(), fn) {
return true
}
} else if bfs, ok := fs.(FilesystemsUnwrapper); ok {
for _, sf := range bfs.UnwrapFilesystems() {
if WalkFilesystems(sf, fn) {
return true
}
}
} else if cfs, ok := fs.(overlayfs.FilesystemIterator); ok {
for i := 0; i < cfs.NumFilesystems(); i++ {
if WalkFilesystems(cfs.Filesystem(i), fn) {
return true
}
}
}
return false
}
var _ FilesystemUnwrapper = (*filesystemsWrapper)(nil)
// NewBasePathFs creates a new BasePathFs.
func NewBasePathFs(source afero.Fs, path string) afero.Fs {
return WrapFilesystem(afero.NewBasePathFs(source, path), source)
}
// NewReadOnlyFs creates a new ReadOnlyFs.
func NewReadOnlyFs(source afero.Fs) afero.Fs {
return WrapFilesystem(afero.NewReadOnlyFs(source), source)
}
// WrapFilesystem is typically used to wrap a afero.BasePathFs to allow
// access to the underlying filesystem if needed.
func WrapFilesystem(container, content afero.Fs) afero.Fs {
return filesystemsWrapper{Fs: container, content: content}
}
type filesystemsWrapper struct {
afero.Fs
content afero.Fs
}
func (w filesystemsWrapper) UnwrapFilesystem() afero.Fs {
return w.content
}