cc-backend/web/web.go

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// Copyright (C) 2022 NHR@FAU, University Erlangen-Nuremberg.
// All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package web
import (
"embed"
"html/template"
"io/fs"
"net/http"
"strings"
"github.com/ClusterCockpit/cc-backend/internal/config"
"github.com/ClusterCockpit/cc-backend/pkg/log"
"github.com/ClusterCockpit/cc-backend/pkg/schema"
)
/// Go's embed is only allowed to embed files in a subdirectory of the embedding package ([see here](https://github.com/golang/go/issues/46056)).
//go:embed frontend/public/*
var frontendFiles embed.FS
func ServeFiles() http.Handler {
publicFiles, err := fs.Sub(frontendFiles, "frontend/public")
if err != nil {
panic(err)
}
return http.FileServer(http.FS(publicFiles))
}
//go:embed templates/*
var templateFiles embed.FS
var templates map[string]*template.Template = map[string]*template.Template{}
func init() {
base := template.Must(template.ParseFS(templateFiles, "templates/base.tmpl"))
if err := fs.WalkDir(templateFiles, "templates", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() || path == "templates/base.tmpl" {
return nil
}
templates[strings.TrimPrefix(path, "templates/")] = template.Must(template.Must(base.Clone()).ParseFS(templateFiles, path))
return nil
}); err != nil {
panic(err)
}
_ = base
}
type User struct {
Username string // Username of the currently logged in user
Project string // Project of the user (relevant for managers only)
AuthLevel int // Level of authorization
}
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type Build struct {
Version string
Hash string
Buildtime string
}
type Page struct {
Title string // Page title
Error string // For generic use (e.g. the exact error message on /login)
Info string // For generic use (e.g. "Logout successfull" on /login)
User User // Information about the currently logged in user
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Build Build // Latest information about the application
Clusters []schema.ClusterConfig // List of all clusters for use in the Header
FilterPresets map[string]interface{} // For pages with the Filter component, this can be used to set initial filters.
Infos map[string]interface{} // For generic use (e.g. username for /monitoring/user/<id>, job id for /monitoring/job/<id>)
Config map[string]interface{} // UI settings for the currently logged in user (e.g. line width, ...)
}
func RenderTemplate(rw http.ResponseWriter, r *http.Request, file string, page *Page) {
t, ok := templates[file]
if !ok {
panic("template not found")
}
if page.Clusters == nil {
for _, c := range config.Keys.Clusters {
page.Clusters = append(page.Clusters, schema.ClusterConfig{Name: c.Name, FilterRanges: c.FilterRanges, MetricDataRepository: nil})
}
}
log.Infof("%v\n", page.Config)
if err := t.Execute(rw, page); err != nil {
log.Errorf("template error: %s", err.Error())
}
}