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package sockjs
import (
"fmt"
"io"
"net/http"
"net/url"
"strings"
)
func (h *Handler) eventSource(rw http.ResponseWriter, req *http.Request) {
rw.Header().Set("content-type", "text/event-stream; charset=UTF-8")
_, _ = fmt.Fprint(rw, "\r\n")
rw.(http.Flusher).Flush()
recv := newHTTPReceiver(rw, req, h.options.ResponseLimit, new(eventSourceFrameWriter), ReceiverTypeEventSource)
sess, err := h.sessionByRequest(req)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
if err := sess.attachReceiver(recv); err != nil {
if err := recv.sendFrame(cFrame); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
recv.close()
return
}
sess.startHandlerOnce.Do(func() { go h.handlerFunc(Session{sess}) })
select {
case <-recv.doneNotify():
case <-recv.interruptedNotify():
}
}
type eventSourceFrameWriter struct{}
var escaper *strings.Replacer = strings.NewReplacer(
"%", url.QueryEscape("%"),
"\n", url.QueryEscape("\n"),
"\r", url.QueryEscape("\r"),
"\x00", url.QueryEscape("\x00"),
)
func (*eventSourceFrameWriter) write(w io.Writer, frame string) (int, error) {
return fmt.Fprintf(w, "data: %s\r\n\r\n", escaper.Replace(frame))
}
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