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tpl/tplimpl: Rework template management to get rid of concurrency issues

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This more or less completes the simplification of the template handling code in Hugo started in v0.62.

The main motivation was to fix a long lasting issue about a crash in HTML content files  without front matter.

But this commit also comes with a big functional improvement.

As we now have moved the base template evaluation to the build stage we now use the same lookup rules for `baseof` as for `list` etc. type of templates.

This means that in this simple example you can have a `baseof` template for the `blog` section without having to duplicate the others:

```
layouts
├── _default
│   ├── baseof.html
│   ├── list.html
│   └── single.html
└── blog
    └── baseof.html
```

Also, when simplifying code, you often get rid of some double work, as shown in the "site building" benchmarks below.

These benchmarks looks suspiciously good, but I have repeated the below with ca. the same result. Compared to master:

```
name                              old time/op    new time/op    delta
SiteNew/Bundle_with_image-16        13.1ms ± 1%    10.5ms ± 1%  -19.34%  (p=0.029 n=4+4)
SiteNew/Bundle_with_JSON_file-16    13.0ms ± 0%    10.7ms ± 1%  -18.05%  (p=0.029 n=4+4)
SiteNew/Tags_and_categories-16      46.4ms ± 2%    43.1ms ± 1%   -7.15%  (p=0.029 n=4+4)
SiteNew/Canonify_URLs-16            52.2ms ± 2%    47.8ms ± 1%   -8.30%  (p=0.029 n=4+4)
SiteNew/Deep_content_tree-16        77.9ms ± 1%    70.9ms ± 1%   -9.01%  (p=0.029 n=4+4)
SiteNew/Many_HTML_templates-16      43.0ms ± 0%    37.2ms ± 1%  -13.54%  (p=0.029 n=4+4)
SiteNew/Page_collections-16         58.2ms ± 1%    52.4ms ± 1%   -9.95%  (p=0.029 n=4+4)

name                              old alloc/op   new alloc/op   delta
SiteNew/Bundle_with_image-16        3.81MB ± 0%    2.22MB ± 0%  -41.70%  (p=0.029 n=4+4)
SiteNew/Bundle_with_JSON_file-16    3.60MB ± 0%    2.01MB ± 0%  -44.20%  (p=0.029 n=4+4)
SiteNew/Tags_and_categories-16      19.3MB ± 1%    14.1MB ± 0%  -26.91%  (p=0.029 n=4+4)
SiteNew/Canonify_URLs-16            70.7MB ± 0%    69.0MB ± 0%   -2.40%  (p=0.029 n=4+4)
SiteNew/Deep_content_tree-16        37.1MB ± 0%    31.2MB ± 0%  -15.94%  (p=0.029 n=4+4)
SiteNew/Many_HTML_templates-16      17.6MB ± 0%    10.6MB ± 0%  -39.92%  (p=0.029 n=4+4)
SiteNew/Page_collections-16         25.9MB ± 0%    21.2MB ± 0%  -17.99%  (p=0.029 n=4+4)

name                              old allocs/op  new allocs/op  delta
SiteNew/Bundle_with_image-16         52.3k ± 0%     26.1k ± 0%  -50.18%  (p=0.029 n=4+4)
SiteNew/Bundle_with_JSON_file-16     52.3k ± 0%     26.1k ± 0%  -50.16%  (p=0.029 n=4+4)
SiteNew/Tags_and_categories-16        336k ± 1%      269k ± 0%  -19.90%  (p=0.029 n=4+4)
SiteNew/Canonify_URLs-16              422k ± 0%      395k ± 0%   -6.43%  (p=0.029 n=4+4)
SiteNew/Deep_content_tree-16          401k ± 0%      313k ± 0%  -21.79%  (p=0.029 n=4+4)
SiteNew/Many_HTML_templates-16        247k ± 0%      143k ± 0%  -42.17%  (p=0.029 n=4+4)
SiteNew/Page_collections-16           282k ± 0%      207k ± 0%  -26.55%  (p=0.029 n=4+4)
```

Fixes #6716
Fixes #6760
Fixes #6768
Fixes #6778
This commit is contained in:
Bjørn Erik Pedersen
2020-01-15 15:59:56 +01:00
parent 8585b388d2
commit c6d650c8c8
46 changed files with 1332 additions and 1446 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
resources/resource_transformers/templates/execute_as_template.go
View File

@@ -26,28 +26,25 @@ import (
// Client contains methods to perform template processing of Resource objects.
type Client struct {
rs *resources.Spec
templateHandler tpl.TemplateHandler
textTemplate tpl.TemplateParseFinder
t tpl.TemplatesProvider
}
// New creates a new Client with the given specification.
func New(rs *resources.Spec, h tpl.TemplateHandler, textTemplate tpl.TemplateParseFinder) *Client {
func New(rs *resources.Spec, t tpl.TemplatesProvider) *Client {
if rs == nil {
panic("must provice a resource Spec")
}
if textTemplate == nil {
panic("must provide a textTemplate")
if t == nil {
panic("must provide a template provider")
}
return &Client{rs: rs, templateHandler: h, textTemplate: textTemplate}
return &Client{rs: rs, t: t}
}
type executeAsTemplateTransform struct {
rs *resources.Spec
textTemplate tpl.TemplateParseFinder
templateHandler tpl.TemplateHandler
targetPath string
data interface{}
rs *resources.Spec
t tpl.TemplatesProvider
targetPath string
data interface{}
}
func (t *executeAsTemplateTransform) Key() internal.ResourceTransformationKey {
@@ -56,22 +53,21 @@ func (t *executeAsTemplateTransform) Key() internal.ResourceTransformationKey {
func (t *executeAsTemplateTransform) Transform(ctx *resources.ResourceTransformationCtx) error {
tplStr := helpers.ReaderToString(ctx.From)
templ, err := t.textTemplate.Parse(ctx.InPath, tplStr)
templ, err := t.t.TextTmpl().Parse(ctx.InPath, tplStr)
if err != nil {
return errors.Wrapf(err, "failed to parse Resource %q as Template:", ctx.InPath)
}
ctx.OutPath = t.targetPath
return t.templateHandler.Execute(templ, ctx.To, t.data)
return t.t.Tmpl().Execute(templ, ctx.To, t.data)
}
func (c *Client) ExecuteAsTemplate(res resources.ResourceTransformer, targetPath string, data interface{}) (resource.Resource, error) {
return res.Transform(&executeAsTemplateTransform{
rs: c.rs,
targetPath: helpers.ToSlashTrimLeading(targetPath),
templateHandler: c.templateHandler,
textTemplate: c.textTemplate,
data: data,
rs: c.rs,
targetPath: helpers.ToSlashTrimLeading(targetPath),
t: c.t,
data: data,
})
}