Emojis in notifications; server caching

util/embedfs.go

@@ -0,0 +1,79 @@
+package util
+
+import (
+	"embed"
+	"errors"
+	"io"
+	"io/fs"
+	"time"
+)
+
+type CachingEmbedFS struct {
+	ModTime time.Time
+	FS      embed.FS
+}
+
+func (e CachingEmbedFS) Open(name string) (fs.File, error) {
+	f, err := e.FS.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	return &cachingEmbedFile{f, e.ModTime}, nil
+}
+
+type cachingEmbedFile struct {
+	file    fs.File
+	modTime time.Time
+}
+
+func (f cachingEmbedFile) Stat() (fs.FileInfo, error) {
+	s, err := f.file.Stat()
+	if err != nil {
+		return nil, err
+	}
+	return &etagEmbedFileInfo{s, f.modTime}, nil
+}
+
+func (f cachingEmbedFile) Read(bytes []byte) (int, error) {
+	return f.file.Read(bytes)
+}
+
+func (f *cachingEmbedFile) Seek(offset int64, whence int) (int64, error) {
+	if seeker, ok := f.file.(io.Seeker); ok {
+		return seeker.Seek(offset, whence)
+	}
+	return 0, errors.New("io.Seeker not implemented")
+}
+
+func (f cachingEmbedFile) Close() error {
+	return f.file.Close()
+}
+
+type etagEmbedFileInfo struct {
+	file    fs.FileInfo
+	modTime time.Time
+}
+
+func (e etagEmbedFileInfo) Name() string {
+	return e.file.Name()
+}
+
+func (e etagEmbedFileInfo) Size() int64 {
+	return e.file.Size()
+}
+
+func (e etagEmbedFileInfo) Mode() fs.FileMode {
+	return e.file.Mode()
+}
+
+func (e etagEmbedFileInfo) ModTime() time.Time {
+	return e.modTime // We override this!
+}
+
+func (e etagEmbedFileInfo) IsDir() bool {
+	return e.file.IsDir()
+}
+
+func (e etagEmbedFileInfo) Sys() interface{} {
+	return e.file.Sys()
+}