You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
1.3 KiB
Go
79 lines
1.3 KiB
Go
package serverevents
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"net/http"
|
|
)
|
|
|
|
type Config struct {
|
|
Connected func(chan string)
|
|
Disconnected func(chan string)
|
|
}
|
|
|
|
type Handler interface {
|
|
http.Handler
|
|
Broadcast(message string)
|
|
}
|
|
|
|
type handler struct {
|
|
clients map[chan string]bool
|
|
|
|
Connected func(chan string)
|
|
Disconnected func(chan string)
|
|
}
|
|
|
|
func New(config *Config) Handler {
|
|
return &handler{
|
|
make(map[chan string]bool),
|
|
config.Connected,
|
|
config.Disconnected,
|
|
}
|
|
}
|
|
|
|
func (sse *handler) Broadcast(message string) {
|
|
for client := range sse.clients {
|
|
client <- message
|
|
}
|
|
}
|
|
|
|
func (sse *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
w.Header().Set("Content-Type", "text/event-stream")
|
|
w.Header().Set("Cache-Control", "no-cache")
|
|
w.Header().Set("Connection", "keep-alive")
|
|
w.Header().Set("Access-Control-Allow-Origin", "*")
|
|
|
|
client := make(chan string)
|
|
sse.clients[client] = true
|
|
|
|
log.Printf(`New connection`)
|
|
|
|
if sse.Connected != nil {
|
|
sse.Connected(client)
|
|
}
|
|
|
|
defer func() {
|
|
log.Printf(`Connection closed`)
|
|
close(client)
|
|
delete(sse.clients, client)
|
|
if sse.Disconnected != nil {
|
|
sse.Disconnected(client)
|
|
}
|
|
}()
|
|
|
|
flusher, _ := w.(http.Flusher)
|
|
for {
|
|
select {
|
|
case message, ok := <-client:
|
|
if !ok {
|
|
return
|
|
}
|
|
|
|
fmt.Fprintf(w, "data: %s\n\n", message)
|
|
flusher.Flush()
|
|
case <-r.Context().Done():
|
|
return
|
|
}
|
|
}
|
|
}
|