mirror of
https://github.com/grafana/grafana.git
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80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
// Copyright 2013 Martini Authors
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// Copyright 2014 The Macaron Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package web
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import (
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"html/template"
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"io/fs"
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"net/http"
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"os"
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"path/filepath"
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"golang.org/x/sync/singleflight"
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)
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// Renderer is a Middleware that injects a template renderer into the macaron context, enabling ctx.HTML calls in the handlers.
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// If MACARON_ENV is set to "development" then templates will be recompiled on every request. For more performance, set the
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// MACARON_ENV environment variable to "production".
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func Renderer(dir, leftDelim, rightDelim string) Middleware {
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var devEnvGr singleflight.Group
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fs := os.DirFS(dir)
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t, err := compileTemplates(fs, leftDelim, rightDelim)
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if err != nil {
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panic("Renderer: " + err.Error())
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}
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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ctx := FromContext(req.Context())
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ctx.template = t
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if Env == DEV {
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tt, err, _ := devEnvGr.Do("dev", func() (any, error) {
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return compileTemplates(fs, leftDelim, rightDelim)
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})
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if err != nil {
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panic("Context.HTML:" + err.Error())
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}
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ctx.template = tt.(*template.Template)
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}
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next.ServeHTTP(rw, req)
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})
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}
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}
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func compileTemplates(filesystem fs.FS, leftDelim, rightDelim string) (*template.Template, error) {
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t := template.New("")
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t.Delims(leftDelim, rightDelim)
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err := fs.WalkDir(filesystem, ".", func(path string, d fs.DirEntry, e error) error {
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if e != nil {
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return nil // skip unreadable or erroneous filesystem items
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}
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if d.IsDir() {
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return nil
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}
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ext := filepath.Ext(path)
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if ext != ".html" && ext != ".tmpl" {
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return nil
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}
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data, err := fs.ReadFile(filesystem, path)
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if err != nil {
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return err
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}
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basename := path[:len(path)-len(ext)]
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_, err = t.New(basename).Parse(string(data))
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return err
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})
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return t, err
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}
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