Atridad Lahiji
497abfe83f
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93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
package api
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import (
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"fmt"
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"net/http"
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"time"
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"atri.dad/lib"
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"github.com/labstack/echo/v4"
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)
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// SSE godoc
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// @Summary Server-Sent Events endpoint
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// @Description Establishes a Server-Sent Events connection
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// @Tags sse
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// @Accept json
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// @Produce text/event-stream
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// @Param channel query string false "Channel name"
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// @Success 200 {string} string "Event stream"
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// @Router /sse [get]
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func SSE(c echo.Context) error {
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channel := c.QueryParam("channel")
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if channel == "" {
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channel = "default"
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}
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// Use the request context, which is cancelled when the client disconnects
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ctx := c.Request().Context()
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// Set headers for SSE
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c.Response().Header().Set("Content-Type", "text/event-stream")
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c.Response().Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
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c.Response().Header().Set("Connection", "keep-alive")
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c.Response().Header().Set("Pragma", "no-cache")
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c.Response().Header().Set("Expires", "0")
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c.Response().Header().Set("X-Accel-Buffering", "no")
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// Set CORS headers
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origin := c.Request().Header.Get("Origin")
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if origin == "https://atri.dad" || origin == "http://localhost:3000" {
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c.Response().Header().Set("Access-Control-Allow-Origin", origin)
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c.Response().Header().Set("Access-Control-Allow-Credentials", "true")
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} else {
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// Allow any origin as fallback for testing
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c.Response().Header().Set("Access-Control-Allow-Origin", "*")
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}
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// Set response status
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c.Response().WriteHeader(http.StatusOK)
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c.Response().Flush()
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// Create a channel to receive messages
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clientChan := make(chan string)
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// Add the client to the SSEServer
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lib.SSEServer.AddClient(channel, clientChan)
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// Clean up when the connection is closed
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defer lib.SSEServer.RemoveClient(channel, clientChan)
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// Write the initial message
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initialMsg := ": connected\n\n"
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if _, err := c.Response().Write([]byte(initialMsg)); err != nil {
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return err
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}
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c.Response().Flush()
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// Create a ticker for keep-alive messages
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ticker := time.NewTicker(15 * time.Second)
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defer ticker.Stop()
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// Event loop
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for {
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select {
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case <-ctx.Done():
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// Client disconnected
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return nil
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case <-ticker.C:
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// Send keep-alive comment
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if _, err := c.Response().Write([]byte(": ping\n\n")); err != nil {
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return err
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}
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c.Response().Flush()
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case msg := <-clientChan:
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// Format the SSE message
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data := fmt.Sprintf("data: %s\n\n", msg)
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if _, err := c.Response().Write([]byte(data)); err != nil {
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return err
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}
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c.Response().Flush()
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}
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}
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}
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