90 lines
2.0 KiB
Go
90 lines
2.0 KiB
Go
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package html
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import (
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"fmt"
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"html/template"
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"net/http"
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"path/filepath"
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"github.com/oxtoacart/bpool"
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)
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// TemplateService is a template/html based templating service
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type TemplateService struct {
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templates map[string]*template.Template
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pool *bpool.BufferPool
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helpers template.FuncMap
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}
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// LoadTemplates loads the templates used by the service
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func (t *TemplateService) LoadTemplates(templatesDir string) error {
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layouts, err := filepath.Glob(filepath.Join(templatesDir, "layouts", "*.tmpl"))
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if err != nil {
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return err
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}
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blocks, err := filepath.Glob(filepath.Join(templatesDir, "blocks", "*.tmpl"))
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if err != nil {
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return err
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}
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// Generate our templates map from our layouts/ and blocks/ directories
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for _, layout := range layouts {
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var err error
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files := append(blocks, layout)
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tmpl := template.New("")
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tmpl.Funcs(t.helpers)
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tmpl, err = tmpl.ParseFiles(files...)
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if err != nil {
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return err
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}
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t.templates[filepath.Base(layout)] = tmpl
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}
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return nil
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}
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// RenderPage renders a template to the given http.ResponseWriter
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func (t *TemplateService) RenderPage(w http.ResponseWriter, templateName string, data interface{}) error {
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// Ensure the template exists in the map.
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tmpl, ok := t.templates[templateName]
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if !ok {
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return fmt.Errorf("the template '%s' does not exist", templateName)
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}
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// Create a buffer to temporarily write to and check if any errors were encountered.
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buf := t.pool.Get()
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defer t.pool.Put(buf)
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if err := tmpl.ExecuteTemplate(buf, templateName, data); err != nil {
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return err
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}
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// Set the header and write the buffer to the http.ResponseWriter
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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_, err := buf.WriteTo(w)
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return err
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}
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// NewTemplateService returns a new Service
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func NewTemplateService(funcs ...OptionFunc) *TemplateService {
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options := defaultOptions()
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for _, f := range funcs {
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f(options)
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}
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return &TemplateService{
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templates: make(map[string]*template.Template),
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pool: bpool.NewBufferPool(options.PoolSize),
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helpers: options.Helpers,
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}
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}
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