121 lines
2.5 KiB
Go
121 lines
2.5 KiB
Go
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
||
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
||
|
|
|
||
|
|
package sse
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"fmt"
|
||
|
|
"net/http"
|
||
|
|
"strconv"
|
||
|
|
"time"
|
||
|
|
)
|
||
|
|
|
||
|
|
// ServeHTTP serves new connections with events for a given stream ...
|
||
|
|
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||
|
|
flusher, err := w.(http.Flusher)
|
||
|
|
if !err {
|
||
|
|
http.Error(w, "Streaming unsupported!", http.StatusInternalServerError)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
w.Header().Set("Content-Type", "text/event-stream")
|
||
|
|
w.Header().Set("Cache-Control", "no-cache")
|
||
|
|
w.Header().Set("Connection", "keep-alive")
|
||
|
|
|
||
|
|
for k, v := range s.Headers {
|
||
|
|
w.Header().Set(k, v)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get the StreamID from the URL
|
||
|
|
streamID := r.URL.Query().Get("stream")
|
||
|
|
if streamID == "" {
|
||
|
|
http.Error(w, "Please specify a stream!", http.StatusInternalServerError)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
stream := s.getStream(streamID)
|
||
|
|
|
||
|
|
if stream == nil {
|
||
|
|
if !s.AutoStream {
|
||
|
|
http.Error(w, "Stream not found!", http.StatusInternalServerError)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
stream = s.CreateStream(streamID)
|
||
|
|
}
|
||
|
|
|
||
|
|
eventid := 0
|
||
|
|
if id := r.Header.Get("Last-Event-ID"); id != "" {
|
||
|
|
var err error
|
||
|
|
eventid, err = strconv.Atoi(id)
|
||
|
|
if err != nil {
|
||
|
|
http.Error(w, "Last-Event-ID must be a number!", http.StatusBadRequest)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Create the stream subscriber
|
||
|
|
sub := stream.addSubscriber(eventid, r.URL)
|
||
|
|
|
||
|
|
go func() {
|
||
|
|
<-r.Context().Done()
|
||
|
|
|
||
|
|
sub.close()
|
||
|
|
|
||
|
|
if s.AutoStream && !s.AutoReplay && stream.getSubscriberCount() == 0 {
|
||
|
|
s.RemoveStream(streamID)
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
|
||
|
|
w.WriteHeader(http.StatusOK)
|
||
|
|
flusher.Flush()
|
||
|
|
|
||
|
|
// Push events to client
|
||
|
|
for ev := range sub.connection {
|
||
|
|
// If the data buffer is an empty string abort.
|
||
|
|
if len(ev.Data) == 0 && len(ev.Comment) == 0 {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
// if the event has expired, dont send it
|
||
|
|
if s.EventTTL != 0 && time.Now().After(ev.timestamp.Add(s.EventTTL)) {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
if len(ev.Data) > 0 {
|
||
|
|
fmt.Fprintf(w, "id: %s\n", ev.ID)
|
||
|
|
|
||
|
|
if s.SplitData {
|
||
|
|
sd := bytes.Split(ev.Data, []byte("\n"))
|
||
|
|
for i := range sd {
|
||
|
|
fmt.Fprintf(w, "data: %s\n", sd[i])
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if bytes.HasPrefix(ev.Data, []byte(":")) {
|
||
|
|
fmt.Fprintf(w, "%s\n", ev.Data)
|
||
|
|
} else {
|
||
|
|
fmt.Fprintf(w, "data: %s\n", ev.Data)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if len(ev.Event) > 0 {
|
||
|
|
fmt.Fprintf(w, "event: %s\n", ev.Event)
|
||
|
|
}
|
||
|
|
|
||
|
|
if len(ev.Retry) > 0 {
|
||
|
|
fmt.Fprintf(w, "retry: %s\n", ev.Retry)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if len(ev.Comment) > 0 {
|
||
|
|
fmt.Fprintf(w, ": %s\n", ev.Comment)
|
||
|
|
}
|
||
|
|
|
||
|
|
fmt.Fprint(w, "\n")
|
||
|
|
|
||
|
|
flusher.Flush()
|
||
|
|
}
|
||
|
|
}
|