func (server *Server) contentDirectoryEventSubHandler(w http.ResponseWriter, r *http.Request) {
if server.StallEventSubscribe {
// I have an LG TV that doesn't like my eventing implementation.
// Returning unimplemented (501?) errors, results in repeat subscribe
// attempts which hits some kind of error count limit on the TV
// causing it to forcefully disconnect. It also won't work if the CDS
// service doesn't include an EventSubURL. The best thing I can do is
// cause every attempt to subscribe to timeout on the TV end, which
// reduces the error rate enough that the TV continues to operate
// without eventing.
//
// I've not found a reliable way to identify this TV, since it and
// others don't seem to include any client-identifying headers on
// SUBSCRIBE requests.
//
// TODO: Get eventing to work with the problematic TV.
t := time.Now()
<-w.(http.CloseNotifier).CloseNotify()
eventingLogger.Printf("stalled subscribe connection went away after %s", time.Since(t))
return
}
// The following code is a work in progress. It partially implements
// the spec on eventing but hasn't been completed as I have nothing to
// test it with.
eventingLogger.Print(r.Header)
service := server.services["ContentDirectory"]
eventingLogger.Println(r.RemoteAddr, r.Method, r.Header.Get("SID"))
if r.Method == "SUBSCRIBE" && r.Header.Get("SID") == "" {
urls := upnp.ParseCallbackURLs(r.Header.Get("CALLBACK"))
eventingLogger.Println(urls)
var timeout int
fmt.Sscanf(r.Header.Get("TIMEOUT"), "Second-%d", &timeout)
eventingLogger.Println(timeout, r.Header.Get("TIMEOUT"))
sid, timeout, _ := service.Subscribe(urls, timeout)
w.Header()["SID"] = []string{sid}
w.Header()["TIMEOUT"] = []string{fmt.Sprintf("Second-%d", timeout)}
// TODO: Shouldn't have to do this to get headers logged.
w.WriteHeader(http.StatusOK)
go func() {
time.Sleep(100 * time.Millisecond)
server.contentDirectoryInitialEvent(urls, sid)
}()
} else if r.Method == "SUBSCRIBE" {
http.Error(w, "meh", http.StatusPreconditionFailed)
} else {
eventingLogger.Printf("unhandled event method: %s", r.Method)
}
}
func (server *Server) contentDirectoryEventSubHandler(w http.ResponseWriter, r *http.Request) {
if r.UserAgent() == "" && true {
// This should block forever. Clearly it's a minor resource leak,
// since the underlying transport should expire eventually. I have
// an (LG?) TV that doesn't provide a User-Agent in this request
// that will refuse to operate correctly with any eventing I've
// implemented. Returning unimplemented (501?) errors, results in
// repeat subscribe attempts which hits some kind of error count
// limit on the TV causing it to forcefully disconnect. It also
// won't work if the CDS service doesn't include an EventSubURL.
// The best thing I can do is cause every attempt to subscribe to
// timeout on the TV end, which reduces the error rate enough that
// the TV continues to operate without eventing.
//
// TODO: Stall the underlying connection until it drops without
// stalling the entire goroutine indefinitely, get eventing to
// work with the problematic TV.
timeoutSocketBelt.Ride()
return
}
// The following code is a work in progress. It partially implements
// the spec on eventing but hasn't been completed as I have nothing to
// test it with.
log.Print(r.Header)
service := server.services["ContentDirectory"]
log.Println(r.RemoteAddr, r.Method, r.Header.Get("SID"))
if r.Method == "SUBSCRIBE" && r.Header.Get("SID") == "" {
urls := upnp.ParseCallbackURLs(r.Header.Get("CALLBACK"))
log.Println(urls)
var timeout int
fmt.Sscanf(r.Header.Get("TIMEOUT"), "Second-%d", &timeout)
log.Println(timeout, r.Header.Get("TIMEOUT"))
sid, timeout, _ := service.Subscribe(urls, timeout)
w.Header()["SID"] = []string{sid}
w.Header()["TIMEOUT"] = []string{fmt.Sprintf("Second-%d", timeout)}
// TODO: Shouldn't have to do this to get headers logged.
w.WriteHeader(http.StatusOK)
go func() {
time.Sleep(100 * time.Millisecond)
server.contentDirectoryInitialEvent(urls, sid)
}()
} else if r.Method == "SUBSCRIBE" {
http.Error(w, "meh", http.StatusPreconditionFailed)
} else {
log.Print("unhandled event")
}
}