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Fix missing page data for alternative formats #9342

Merged
merged 2 commits into from
Jan 12, 2022
Merged

Fix missing page data for alternative formats #9342

merged 2 commits into from
Jan 12, 2022

Commits on Jan 12, 2022

  1. Fix missing page data for alternative formats 

    When a template calls the .Translations function and a
Hugo environment is using multiple output formats,
a template that calls methods like .Summary and .Len on
each translation will unexpectedly show empty return
values for these methods.

This is because each pageOutput's ContentProvider is
assigned to a page.NopPage in newPageOutput. When
*HugoSites.render assigns pageContentOutputs to
pageOutputs in *pageState.shiftToOutputFormat, it
reuses pageContentOutputs from other pageOutputs,
leaving some pageContentOutputs as NopPages. While this
approach conserves resources, sometimes it means that
a template will unexpectedly call a method on a
pageContentOutput that is actually a NopPage.

In the case of ContentProvider methods called on
translations for alternative output formats, the methods
were called on NopPages.

This change introduces LazyContentProvider, which
performs late initialization when one of its methods is
called. This way, we can reuse content in "normal" cases
but ensure that ContentProvider methods work as expected
when a pageOutput is not assigned a pageContentOutput
during the initial pre-render phase.

Fixes gohugoio#8919
    @ptgott @bep
    ptgott authored and bep committed Jan 12, 2022
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  2. Only create LazyContentProvider for the non-rendering Site 

    Which saves a fair amound of allocations:

```
gobench --package ./hugolib --bench "SiteNew/Regular_D" --base master
```

Before:

```
name                                  old time/op    new time/op    delta
SiteNew/Regular_Deep_content_tree-10    40.7ms ± 3%    41.2ms ± 1%    ~     (p=0.343 n=4+4)

name                                  old alloc/op   new alloc/op   delta
SiteNew/Regular_Deep_content_tree-10    27.7MB ± 0%    28.8MB ± 0%  +3.76%  (p=0.029 n=4+4)

name                                  old allocs/op  new allocs/op  delta
SiteNew/Regular_Deep_content_tree-10      304k ± 0%      329k ± 0%  +8.07%  (p=0.029 n=4+4)
```

After:

```
name                                  old time/op    new time/op    delta
SiteNew/Regular_Deep_content_tree-10    34.2ms ± 1%    34.7ms ± 1%    ~     (p=0.114 n=4+4)

name                                  old alloc/op   new alloc/op   delta
SiteNew/Regular_Deep_content_tree-10    27.7MB ± 0%    28.1MB ± 0%  +1.38%  (p=0.029 n=4+4)

name                                  old allocs/op  new allocs/op  delta
SiteNew/Regular_Deep_content_tree-10      304k ± 0%      314k ± 0%  +3.03%  (p=0.029 n=4+4)
```

Updates gohugoio#8919
    @bep
    bep committed Jan 12, 2022
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