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modtimevfs.go
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modtimevfs.go
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// Copyright 2018 The Prometheus 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 modtimevfs implements a virtual file system that returns a fixed
// modification time for all files and directories.
package modtimevfs
import (
"net/http"
"os"
"time"
)
type timefs struct {
fs http.FileSystem
t time.Time
}
// New returns a file system that returns constant modification time for all files.
func New(fs http.FileSystem, t time.Time) http.FileSystem {
return &timefs{fs: fs, t: t}
}
type file struct {
http.File
os.FileInfo
t time.Time
}
func (t *timefs) Open(name string) (http.File, error) {
f, err := t.fs.Open(name)
if err != nil {
return f, err
}
defer func() {
if err != nil {
f.Close()
}
}()
fstat, err := f.Stat()
if err != nil {
return nil, err
}
return &file{f, fstat, t.t}, nil
}
// Stat implements the http.File interface.
func (f *file) Stat() (os.FileInfo, error) {
return f, nil
}
// ModTime implements the os.FileInfo interface.
func (f *file) ModTime() time.Time {
return f.t
}