69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
package api
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/labstack/echo/v4"
|
|
"goth.stack/lib"
|
|
)
|
|
|
|
// SSE godoc
|
|
// @Summary Server-Sent Events endpoint
|
|
// @Description Establishes a Server-Sent Events connection
|
|
// @Tags sse
|
|
// @Accept json
|
|
// @Produce text/event-stream
|
|
// @Param channel query string false "Channel name"
|
|
// @Success 200 {string} string "Event stream"
|
|
// @Router /sse [get]
|
|
func SSE(c echo.Context) error {
|
|
channel := c.QueryParam("channel")
|
|
if channel == "" {
|
|
channel = "default"
|
|
}
|
|
|
|
// Use the request context, which is cancelled when the client disconnects
|
|
ctx := c.Request().Context()
|
|
|
|
c.Response().Header().Set(echo.HeaderContentType, "text/event-stream")
|
|
c.Response().Header().Set(echo.HeaderConnection, "keep-alive")
|
|
c.Response().Header().Set(echo.HeaderCacheControl, "no-cache")
|
|
|
|
// Create a channel to receive messages from the lib.SSEServer
|
|
clientChan := make(chan string)
|
|
|
|
// Add the client to the lib.SSEServer
|
|
lib.SSEServer.AddClient(channel, clientChan)
|
|
|
|
defer func() {
|
|
// Remove the client from the lib.SSEServer when the connection is closed
|
|
lib.SSEServer.RemoveClient(channel, clientChan)
|
|
}()
|
|
|
|
// Create a ticker that fires every 15 seconds
|
|
ticker := time.NewTicker(30 * time.Second)
|
|
defer ticker.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
// If the client has disconnected, stop the loop
|
|
return nil
|
|
case <-ticker.C:
|
|
// Every 30 seconds, send a comment to keep the connection alive
|
|
if _, err := c.Response().Write([]byte(": keep-alive\n\n")); err != nil {
|
|
return err
|
|
}
|
|
c.Response().Flush()
|
|
case msg := <-clientChan:
|
|
// Handle incoming messages from the lib.SSEServer
|
|
data := fmt.Sprintf("data: %s\n\n", msg)
|
|
if _, err := c.Response().Write([]byte(data)); err != nil {
|
|
return err
|
|
}
|
|
|
|
c.Response().Flush()
|
|
}
|
|
}
|
|
}
|