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template.go
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template.go
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package fsrouter
import (
"html/template"
"io"
"os"
"sync"
)
type TemplateEngine interface {
Render(w io.Writer, view string, data any) error
}
type templateCache struct {
// mutex
mu sync.RWMutex
// reload forces templates to be reloaded each time
reload bool
// templates is a map of loaded templates
templates map[string]*template.Template
}
func NewTemplateCache(reload bool) TemplateEngine {
return &templateCache{
reload: reload,
templates: map[string]*template.Template{},
}
}
func (tc *templateCache) retriveFromCache(filePath string) (*template.Template, bool) {
tc.mu.RLock()
defer tc.mu.Unlock()
if tc.reload {
return nil, false
}
if tmpl, ok := tc.templates[filePath]; ok {
return tmpl, true
}
return nil, false
}
func (tc *templateCache) loadTemplate(filePath string) (*template.Template, error) {
tc.mu.Lock()
defer tc.mu.Unlock()
content, err := os.ReadFile(filePath)
if err != nil {
return nil, err
}
tmpl, err := template.New("").Parse(string(content))
if err != nil {
return nil, err
}
tc.templates[filePath] = tmpl
return tmpl, nil
}
// Render the template for "view" into "w" with "data"
func (tc *templateCache) Render(w io.Writer, view string, data any) error {
tmpl, ok := tc.retriveFromCache(view)
if ok {
return tmpl.Execute(w, data)
}
tmpl, err := tc.loadTemplate(view)
if err == nil {
return tmpl.Execute(w, data)
}
return err
}