all: Rework page store, add a dynacache, improve partial rebuilds, and some general spring cleaningdevelop2024

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

1 files changed, 8 insertions, 10 deletions

diff --git a/go.mod b/go.mod
index 6cb4ad377..e8beedbfb 100644
--- a/go.mod
+++ b/go.mod
@@ -2,9 +2,8 @@ module github.com/gohugoio/hugo
 
 require (
 	github.com/BurntSushi/locker v0.0.0-20171006230638-a6e239ea1c69
-	github.com/PuerkitoBio/purell v1.1.1
 	github.com/alecthomas/chroma/v2 v2.12.0
-	github.com/armon/go-radix v1.0.0
+	github.com/armon/go-radix v1.0.1-0.20221118154546-54df44f2176c
 	github.com/aws/aws-sdk-go v1.48.6
 	github.com/bep/clocks v0.5.0
 	github.com/bep/debounce v1.2.0
@@ -15,10 +14,10 @@ require (
 	github.com/bep/golibsass v1.1.1
 	github.com/bep/gowebp v0.3.0
 	github.com/bep/helpers v0.4.0
-	github.com/bep/lazycache v0.2.0
+	github.com/bep/lazycache v0.4.0
 	github.com/bep/logg v0.4.0
 	github.com/bep/mclib v1.20400.20402
-	github.com/bep/overlayfs v0.6.0
+	github.com/bep/overlayfs v0.9.1
 	github.com/bep/simplecobra v0.4.0
 	github.com/bep/tmc v0.5.1
 	github.com/clbanning/mxj/v2 v2.7.0
@@ -53,6 +52,7 @@ require (
 	github.com/muesli/smartcrop v0.3.0
 	github.com/niklasfasching/go-org v1.7.0
 	github.com/olekukonko/tablewriter v0.0.5
+	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58
 	github.com/pelletier/go-toml/v2 v2.1.1
 	github.com/rogpeppe/go-internal v1.12.0
 	github.com/rwcarlsen/goexif v0.0.0-20190401172101-9e8deecbddbd
@@ -60,17 +60,17 @@ require (
 	github.com/spf13/afero v1.11.0
 	github.com/spf13/cast v1.6.0
 	github.com/spf13/cobra v1.8.0
-	github.com/spf13/fsync v0.9.0
+	github.com/spf13/fsync v0.10.0
 	github.com/spf13/pflag v1.0.5
 	github.com/tdewolff/minify/v2 v2.20.13
 	github.com/tdewolff/parse/v2 v2.7.8
 	github.com/yuin/goldmark v1.6.0
 	github.com/yuin/goldmark-emoji v1.0.2
-	go.uber.org/atomic v1.11.0
 	go.uber.org/automaxprocs v1.5.3
 	gocloud.dev v0.34.0
 	golang.org/x/exp v0.0.0-20221031165847-c99f073a8326
 	golang.org/x/image v0.14.0
+	golang.org/x/mod v0.14.0
 	golang.org/x/net v0.20.0
 	golang.org/x/sync v0.6.0
 	golang.org/x/text v0.14.0
@@ -92,7 +92,6 @@ require (
 	github.com/Azure/go-autorest v14.2.0+incompatible // indirect
 	github.com/Azure/go-autorest/autorest/to v0.4.0 // indirect
 	github.com/AzureAD/microsoft-authentication-library-for-go v1.0.0 // indirect
-	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
 	github.com/aws/aws-sdk-go-v2 v1.20.0 // indirect
 	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.11 // indirect
 	github.com/aws/aws-sdk-go-v2/config v1.18.32 // indirect
@@ -124,7 +123,7 @@ require (
 	github.com/google/wire v0.5.0 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
 	github.com/googleapis/gax-go/v2 v2.12.0 // indirect
-	github.com/hashicorp/golang-lru/v2 v2.0.1 // indirect
+	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/invopop/yaml v0.2.0 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
@@ -142,7 +141,6 @@ require (
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	go.opencensus.io v0.24.0 // indirect
 	golang.org/x/crypto v0.18.0 // indirect
-	golang.org/x/mod v0.14.0 // indirect
 	golang.org/x/oauth2 v0.15.0 // indirect
 	golang.org/x/sys v0.16.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
@@ -158,4 +156,4 @@ require (
 	software.sslmate.com/src/go-pkcs12 v0.2.0 // indirect
 )
 
-go 1.18
+go 1.20