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60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package sse
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import (
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"net/http"
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)
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// Handler is the HTTP handler for the GET /api/events SSE stream.
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// It registers a client with the broadcaster, streams events as they arrive,
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// and unregisters on disconnect.
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type Handler struct {
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bc *Broadcaster
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}
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// NewHandler creates a Handler backed by the given Broadcaster.
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func NewHandler(bc *Broadcaster) *Handler {
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return &Handler{bc: bc}
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}
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// ServeHTTP implements the SSE streaming endpoint.
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// Flusher is required; clients that do not support flushing receive a 501.
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func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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flusher, ok := w.(http.Flusher)
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if !ok {
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http.Error(w, "streaming not supported", http.StatusNotImplemented)
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return
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}
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// SSE-specific headers
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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("X-Accel-Buffering", "no") // Disable nginx buffering
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// Write headers immediately
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flusher.Flush()
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// Subscribe to the broadcaster
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ch := h.bc.Subscribe()
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defer h.bc.Unsubscribe(ch)
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// Use request context for cancellation when the client disconnects.
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ctx := r.Context()
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for {
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select {
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case <-ctx.Done():
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return
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case msg, ok := <-ch:
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if !ok {
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return
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}
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_, err := w.Write([]byte(msg))
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if err != nil {
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return
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}
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flusher.Flush()
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}
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}
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}
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