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// Copyright 2024 The Hugo Authors. All rights reserved.
//
// 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 hugofs
import (
"io/fs"
"os"
"sync"
"github.com/spf13/afero"
)
var _ FilesystemUnwrapper = (*OpenFilesFs)(nil)
// OpenFilesFs is a wrapper around afero.Fs that keeps track of open files.
type OpenFilesFs struct {
afero.Fs
mu sync.Mutex
openFiles map[string]int
}
func (fs *OpenFilesFs) UnwrapFilesystem() afero.Fs {
return fs.Fs
}
func (fs *OpenFilesFs) Create(name string) (afero.File, error) {
f, err := fs.Fs.Create(name)
if err != nil {
return nil, err
}
return fs.trackAndWrapFile(f), nil
}
func (fs *OpenFilesFs) Open(name string) (afero.File, error) {
f, err := fs.Fs.Open(name)
if err != nil {
return nil, err
}
return fs.trackAndWrapFile(f), nil
}
func (fs *OpenFilesFs) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) {
f, err := fs.Fs.OpenFile(name, flag, perm)
if err != nil {
return nil, err
}
return fs.trackAndWrapFile(f), nil
}
func (fs *OpenFilesFs) trackAndWrapFile(f afero.File) afero.File {
fs.mu.Lock()
defer fs.mu.Unlock()
if fs.openFiles == nil {
fs.openFiles = make(map[string]int)
}
fs.openFiles[f.Name()]++
return &openFilesFsFile{fs: fs, File: f}
}
type openFilesFsFile struct {
fs *OpenFilesFs
afero.File
}
func (f *openFilesFsFile) ReadDir(count int) ([]fs.DirEntry, error) {
return f.File.(fs.ReadDirFile).ReadDir(count)
}
func (f *openFilesFsFile) Close() (err error) {
f.fs.mu.Lock()
defer f.fs.mu.Unlock()
err = f.File.Close()
if f.fs.openFiles == nil {
return
}
name := f.Name()
f.fs.openFiles[name]--
if f.fs.openFiles[name] <= 0 {
delete(f.fs.openFiles, name)
}
return
}
func (fs *OpenFilesFs) OpenFiles() map[string]int {
fs.mu.Lock()
defer fs.mu.Unlock()
return fs.openFiles
}
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