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Improve cachability of the web server.

This commit is contained in:
Juliusz Chroboczek 2020-09-18 13:43:30 +02:00
parent 4d79d10d6e
commit 6e84b641e6

View file

@ -42,7 +42,7 @@ func Serve(address string, dataDir string) {
http.HandleFunc("/ice-servers.json",
func(w http.ResponseWriter, r *http.Request) {
mungeHeader(w)
http.ServeFile(w, r,
serveFile(w, r,
filepath.Join(dataDir, "ice-servers.json"))
})
http.HandleFunc("/public-groups.json", publicHandler)
@ -113,6 +113,21 @@ type fileHandler struct {
root http.FileSystem
}
func makeEtag(d os.FileInfo) string {
return fmt.Sprintf("\"%v-%v\"", d.Size(), d.ModTime().UnixNano())
}
const (
normalCacheControl = "max-age=1800"
veryCachableCacheControl = "max-age=86400"
)
func isVeryCachable(p string) bool {
return strings.HasPrefix(p, "/fonts/") ||
strings.HasPrefix(p, "/scripts/") ||
strings.HasPrefix(p, "/css/")
}
func (fh *fileHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
mungeHeader(w)
p := r.URL.Path
@ -165,6 +180,47 @@ func (fh *fileHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
p = index
}
etag := makeEtag(d)
if etag != "" {
w.Header().Add("ETag", etag)
}
cc := normalCacheControl
if isVeryCachable(p) {
cc = veryCachableCacheControl
}
w.Header().Add("Cache-Control", cc)
http.ServeContent(w, r, d.Name(), d.ModTime(), f)
}
// serveFile is similar to http.ServeFile, except that it doesn't check
// for .. and adds cachability headers.
func serveFile(w http.ResponseWriter, r *http.Request, p string) {
f, err := os.Open(p)
if err != nil {
httpError(w, err)
return
}
defer f.Close()
d, err := f.Stat()
if err != nil {
httpError(w, err)
return
}
if d.IsDir() {
httpError(w, ErrIsDirectory)
return
}
etag := makeEtag(d)
if etag != "" {
w.Header().Add("ETag", etag)
}
w.Header().Add("Cache-Control", normalCacheControl)
http.ServeContent(w, r, d.Name(), d.ModTime(), f)
}
@ -210,7 +266,7 @@ func groupHandler(w http.ResponseWriter, r *http.Request) {
return
}
http.ServeFile(w, r, filepath.Join(StaticRoot, "sfu.html"))
serveFile(w, r, filepath.Join(StaticRoot, "sfu.html"))
}
func publicHandler(w http.ResponseWriter, r *http.Request) {