75 lines
1.4 KiB
Go
75 lines
1.4 KiB
Go
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package status
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import (
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"embed"
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"html/template"
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"io/fs"
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"net/http"
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"sync"
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"sync/atomic"
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"github.com/pkg/errors"
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"gitlab.com/wpetit/goweb/logger"
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)
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//go:embed templates/*.gotpl
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var templates embed.FS
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//go:embed public/*
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var public embed.FS
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type Handler struct {
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status *atomic.Value
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public http.Handler
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templates *template.Template
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init sync.Once
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initErr error
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}
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// ServeHTTP implements http.Handler.
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func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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h.init.Do(func() {
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root, err := fs.Sub(public, "public")
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if err != nil {
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h.initErr = errors.WithStack(err)
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return
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}
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h.public = http.FileServer(http.FS(root))
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tmpl, err := template.ParseFS(templates, "templates/*.gotpl")
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if err != nil {
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h.initErr = errors.WithStack(err)
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return
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}
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h.templates = tmpl
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})
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if h.initErr != nil {
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logger.Error(r.Context(), "could not initialize handler", logger.E(h.initErr))
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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switch r.URL.Path {
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case "/":
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h.serveIndex(w, r)
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default:
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h.public.ServeHTTP(w, r)
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}
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}
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func (h *Handler) serveIndex(w http.ResponseWriter, r *http.Request) {
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data := h.status.Load()
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if err := h.templates.ExecuteTemplate(w, "index.html.gotpl", data); err != nil {
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logger.Error(r.Context(), "could not render template", logger.E(errors.WithStack(err)))
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return
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}
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}
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var _ http.Handler = &Handler{}
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