115 lines
2.6 KiB
Go
115 lines
2.6 KiB
Go
package controllers
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import (
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"bytes"
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"fmt"
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"html/template"
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"net/http"
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"path"
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"path/filepath"
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"runtime"
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"sync"
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"goweb/config"
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"goweb/container"
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"goweb/funcmap"
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"github.com/labstack/echo/v4"
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)
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const (
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TemplateDir = "views"
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TemplateExt = ".gohtml"
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)
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var (
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// Cache of compiled page templates
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templates = sync.Map{}
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// Template function map
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funcMap = funcmap.GetFuncMap()
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templatePath = getTemplatesDirectoryPath()
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)
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type Controller struct {
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Container *container.Container
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}
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func NewController(c *container.Container) Controller {
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return Controller{
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Container: c,
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}
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}
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func (t *Controller) RenderPage(c echo.Context, p Page) error {
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if p.Name == "" {
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c.Logger().Error("Page render failed due to missing name")
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return echo.NewHTTPError(http.StatusInternalServerError, "Internal server error")
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}
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if p.AppName == "" {
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p.AppName = t.Container.Config.App.Name
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}
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if err := t.parsePageTemplates(p); err != nil {
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return err
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}
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tmpl, ok := templates.Load(p.Name)
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if !ok {
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c.Logger().Error("Uncached page template requested")
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return echo.NewHTTPError(http.StatusInternalServerError, "Internal server error")
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}
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buf := new(bytes.Buffer)
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err := tmpl.(*template.Template).ExecuteTemplate(buf, p.Layout+TemplateExt, p)
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if err != nil {
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return err
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}
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return c.HTMLBlob(p.StatusCode, buf.Bytes())
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}
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func (t *Controller) parsePageTemplates(p Page) error {
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// Check if the template has not yet been parsed or if the app environment is local, so that templates reflect
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// changes without having the restart the server
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if _, ok := templates.Load(p.Name); !ok || t.Container.Config.App.Environment == config.EnvLocal {
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parsed, err :=
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template.New(p.Layout+TemplateExt).
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Funcs(funcMap).
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ParseFiles(
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fmt.Sprintf("%s/layouts/%s%s", templatePath, p.Layout, TemplateExt),
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fmt.Sprintf("%s/pages/%s%s", templatePath, p.Name, TemplateExt),
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)
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if err != nil {
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return err
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}
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parsed, err = parsed.ParseGlob(fmt.Sprintf("%s/components/*%s", templatePath, TemplateExt))
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if err != nil {
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return err
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}
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// Store the template so this process only happens once
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templates.Store(p.Name, parsed)
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}
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return nil
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}
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func (t *Controller) Redirect(c echo.Context, route string, routeParams ...interface{}) error {
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return c.Redirect(http.StatusFound, c.Echo().Reverse(route, routeParams))
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}
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// getTemplatesDirectoryPath gets the templates directory path
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// This is needed incase this is called from a package outside of main,
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// such as testing
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func getTemplatesDirectoryPath() string {
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_, b, _, _ := runtime.Caller(0)
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d := path.Join(path.Dir(b))
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return filepath.Join(filepath.Dir(d), TemplateDir)
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}
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