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cmd/usrv: Use better caching

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This commit is contained in:
Jakob Borg 2019-08-21 10:33:06 +02:00
parent 5851aabe02
commit fe50f1a158
1 changed files with 28 additions and 7 deletions
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35
cmd/ursrv/main.go
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@ -755,6 +755,8 @@ func main() {
http.HandleFunc("/blockstats.json", withDB(db, blockStatsHandler))
http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
go cacheRefresher(db)
err = srv.Serve(listener)
if err != nil {
log.Fatalln("https:", err)
@ -767,7 +769,31 @@ var (
cacheMut sync.Mutex
)
const maxCacheTime = 5 * 60 * time.Second
const maxCacheTime = 15 * time.Minute
func cacheRefresher(db *sql.DB) {
ticker := time.NewTicker(maxCacheTime - time.Minute)
defer ticker.Stop()
for range ticker.C {
cacheMut.Lock()
if err := refreshCacheLocked(db); err != nil {
log.Println(err)
}
cacheMut.Unlock()
}
}
func refreshCacheLocked(db *sql.DB) error {
rep := getReport(db)
buf := new(bytes.Buffer)
err := tpl.Execute(buf, rep)
if err != nil {
return err
}
cacheData = buf.Bytes()
cacheTime = time.Now()
return nil
}
func rootHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/" || r.URL.Path == "/index.html" {
@ -775,16 +801,11 @@ func rootHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
defer cacheMut.Unlock()
if time.Since(cacheTime) > maxCacheTime {
rep := getReport(db)
buf := new(bytes.Buffer)
err := tpl.Execute(buf, rep)
if err != nil {
if err := refreshCacheLocked(db); err != nil {
log.Println(err)
http.Error(w, "Template Error", http.StatusInternalServerError)
return
}
cacheData = buf.Bytes()
cacheTime = time.Now()
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")