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103 lines
2.0 KiB
Go
103 lines
2.0 KiB
Go
package httputil
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import (
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"fmt"
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"log"
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"net/http"
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)
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type SSEHandler struct {
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clients map[chan string]bool
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Connected func(chan string)
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Disconnected func(chan string)
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}
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func (sse *SSEHandler) init() {
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if sse.clients == nil {
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sse.clients = make(map[chan string]bool)
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}
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}
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func (sse *SSEHandler) Broadcast(message string) {
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sse.init()
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for client := range sse.clients {
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client <- message
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}
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}
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func (sse *SSEHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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sse.init()
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w.Header().Set("Content-Type", "text/event-stream")
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w.Header().Set("Cache-Control", "no-cache")
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w.Header().Set("Connection", "keep-alive")
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w.Header().Set("Access-Control-Allow-Origin", "*")
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client := make(chan string)
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sse.clients[client] = true
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log.Printf(`New connection`)
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if sse.Connected != nil {
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go sse.Connected(client)
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}
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defer func() {
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log.Printf(`Connection closed`)
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close(client)
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delete(sse.clients, client)
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if sse.Disconnected != nil {
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go sse.Disconnected(client)
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}
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}()
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flusher, _ := w.(http.Flusher)
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for {
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select {
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case message, ok := <-client:
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if !ok {
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return
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}
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fmt.Fprintf(w, "data: %s\n\n", message)
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flusher.Flush()
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case <-r.Context().Done():
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return
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}
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}
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}
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// func HandleSSE(handler func(broadcast, single chan<- string)) http.Handler {
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// broadcast := make(chan string)
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// return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// w.Header().Set("Content-Type", "text/event-stream")
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// w.Header().Set("Cache-Control", "no-cache")
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// w.Header().Set("Connection", "keep-alive")
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// w.Header().Set("Access-Control-Allow-Origin", "*")
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// client := make(chan string)
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// defer func() {
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// close(client)
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// }()
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// go handler(broadcast, client)
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// flusher, _ := w.(http.Flusher)
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// for {
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// select {
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// case message := <-broadcast:
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// fmt.Fprintf(w, "data: %s\n\n", message)
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// flusher.Flush()
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// case message := <-client:
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// fmt.Fprintf(w, "data: %s\n\n", message)
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// flusher.Flush()
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// case <-r.Context().Done():
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// return
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// }
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// }
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// })
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// }
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