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