sse + ocr replanish

backend/internal/handler/events.go

@@ -0,0 +1,34 @@
+package handler
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/gin-gonic/gin"
+	"github.com/vaultdrop/backend/internal/service"
+)
+
+type EventHandler struct {
+	broker *service.EventBroker
+}
+
+func NewEventHandler(broker *service.EventBroker) *EventHandler {
+	return &EventHandler{broker: broker}
+}
+
+func (h *EventHandler) Stream(c *gin.Context) {
+	c.Header("Content-Type", "text/event-stream")
+	c.Header("Cache-Control", "no-cache")
+	c.Header("Connection", "keep-alive")
+
+	ch, _ := h.broker.Subscribe(c.Request.Context())
+
+	c.Stream(func(w io.Writer) bool {
+		event, ok := <-ch
+		if !ok {
+			return false
+		}
+		_, err := fmt.Fprintf(w, "event: %s\ndata: %s\n\n", event.Type, event.Data)
+		return err == nil
+	})
+}