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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| /* | ||
| * | ||
| * Copyright 2023 partrenderer 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 partrenderer | ||
|
|
||
| import ( | ||
| "io/fs" | ||
| "path/filepath" | ||
| "text/template" | ||
|
|
||
| "github.com/spf13/afero" | ||
| ) | ||
|
|
||
| type viewManager struct { | ||
| views map[string]*template.Template | ||
| reloadSender chan<- chan<- error | ||
| } | ||
|
|
||
| func newViewManager(views map[string]*template.Template, infos loadInfos) *viewManager { | ||
| vm := &viewManager{views: views} | ||
| reloadChan := make(chan chan<- error) | ||
| go manageReload(reloadChan, infos, vm) | ||
| vm.reloadSender = reloadChan | ||
| return vm | ||
| } | ||
|
|
||
| func manageReload(reloadReceiver <-chan chan<- error, infos loadInfos, vm *viewManager) { | ||
| var waitings []chan<- error | ||
| loadingEnded := make(chan error) | ||
| for { | ||
| select { | ||
| case responder := <-reloadReceiver: | ||
| if len(waitings) == 0 { | ||
| go reloadAndAlert(infos, vm, loadingEnded) | ||
| } | ||
| waitings = append(waitings, responder) | ||
| case err := <-loadingEnded: | ||
| for _, responder := range waitings { | ||
| responder <- err | ||
| } | ||
| waitings = waitings[:0] | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func reloadAndAlert(infos loadInfos, vm *viewManager, endSender chan<- error) { | ||
| views, err := infos.loadViews() | ||
| if err == nil { | ||
| vm.views = views | ||
| } | ||
| endSender <- err | ||
| } | ||
|
|
||
| func (vm *viewManager) get(viewName string) (*template.Template, error) { | ||
| view, ok := vm.views[viewName] | ||
| if !ok { | ||
| return nil, ErrViewNotFound | ||
| } | ||
| return view, nil | ||
| } | ||
|
|
||
| func (vm *viewManager) reload() error { | ||
| ended := make(chan error) | ||
| vm.reloadSender <- ended | ||
| return <-ended | ||
| } | ||
|
|
||
| type loadInfos struct { | ||
| fs afero.Fs | ||
| componentsPath string | ||
| viewsPath string | ||
| fileExt string | ||
| fileExtLen int | ||
| funcs template.FuncMap | ||
| reloadRule ReloadRule | ||
| } | ||
|
|
||
| func (options loadInfos) init() (loadInfos, error) { | ||
| var err error | ||
| if options.viewsPath, err = filepath.Abs(options.viewsPath); err != nil { | ||
| return options, err | ||
| } | ||
| if last := len(options.viewsPath) - 1; options.viewsPath[last] != '/' { | ||
| options.viewsPath += "/" | ||
| } | ||
| return options, nil | ||
| } | ||
|
|
||
| func (options loadInfos) loadViews() (map[string]*template.Template, error) { | ||
| components := template.New("").Funcs(options.funcs) | ||
| err := afero.Walk(options.fs, options.componentsPath, func(path string, fi fs.FileInfo, err error) error { | ||
| if err == nil && !fi.IsDir() && path[len(path)-options.fileExtLen:] == options.fileExt { | ||
| err = parseOne(options.fs, path, components) | ||
| } | ||
| return err | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| inSize := len(options.viewsPath) | ||
| views := map[string]*template.Template{} | ||
| err = afero.Walk(options.fs, options.viewsPath, func(path string, fi fs.FileInfo, err error) error { | ||
| if end := len(path) - options.fileExtLen; err == nil && !fi.IsDir() && path[end:] == options.fileExt { | ||
| t, _ := components.Clone() // here error is always nil | ||
| err = parseOne(options.fs, path, t) | ||
| views[path[inSize:end]] = t | ||
| } | ||
| return err | ||
| }) | ||
| // not supposed to return data on error, but it's a private function | ||
| return views, err | ||
| } | ||
|
|
||
| func parseOne(fs afero.Fs, path string, tmpl *template.Template) error { | ||
| data, err := afero.ReadFile(fs, path) | ||
| if err == nil { | ||
| _, err = tmpl.New(path).Parse(string(data)) | ||
| } | ||
| return err | ||
| } |