79 lines
1.4 KiB
Go
79 lines
1.4 KiB
Go
package util
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import (
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"embed"
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"errors"
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"io"
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"io/fs"
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"time"
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)
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type CachingEmbedFS struct {
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ModTime time.Time
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FS embed.FS
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}
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func (e CachingEmbedFS) Open(name string) (fs.File, error) {
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f, err := e.FS.Open(name)
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if err != nil {
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return nil, err
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}
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return &cachingEmbedFile{f, e.ModTime}, nil
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}
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type cachingEmbedFile struct {
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file fs.File
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modTime time.Time
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}
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func (f cachingEmbedFile) Stat() (fs.FileInfo, error) {
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s, err := f.file.Stat()
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if err != nil {
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return nil, err
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}
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return &etagEmbedFileInfo{s, f.modTime}, nil
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}
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func (f cachingEmbedFile) Read(bytes []byte) (int, error) {
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return f.file.Read(bytes)
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}
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func (f *cachingEmbedFile) Seek(offset int64, whence int) (int64, error) {
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if seeker, ok := f.file.(io.Seeker); ok {
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return seeker.Seek(offset, whence)
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}
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return 0, errors.New("io.Seeker not implemented")
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}
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func (f cachingEmbedFile) Close() error {
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return f.file.Close()
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}
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type etagEmbedFileInfo struct {
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file fs.FileInfo
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modTime time.Time
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}
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func (e etagEmbedFileInfo) Name() string {
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return e.file.Name()
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}
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func (e etagEmbedFileInfo) Size() int64 {
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return e.file.Size()
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}
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func (e etagEmbedFileInfo) Mode() fs.FileMode {
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return e.file.Mode()
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}
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func (e etagEmbedFileInfo) ModTime() time.Time {
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return e.modTime // We override this!
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}
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func (e etagEmbedFileInfo) IsDir() bool {
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return e.file.IsDir()
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}
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func (e etagEmbedFileInfo) Sys() interface{} {
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return e.file.Sys()
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}
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