forked from wrenn/wrenn
Rafeed M. Bhuiyan
05ddf62399
Co-authored-by: Tasnim Kabir Sadik <tksadik@omukk.dev> Reviewed-on: wrenn/wrenn#50
80 lines
2.1 KiB
Go
80 lines
2.1 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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"git.omukk.dev/wrenn/wrenn/pkg/auth"
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"git.omukk.dev/wrenn/wrenn/pkg/id"
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)
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const sseKeepaliveInterval = 30 * time.Second
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type sseHandler struct {
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broker *SSEBroker
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}
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func newSSEHandler(broker *SSEBroker) *sseHandler {
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return &sseHandler{broker: broker}
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}
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// Stream handles GET /v1/events/stream. Authentication is performed by
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// upstream middleware: browser clients use the wrenn_sid cookie (which the
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// EventSource API forwards automatically); SDK clients use X-API-Key.
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func (h *sseHandler) Stream(w http.ResponseWriter, r *http.Request) {
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ac, ok := auth.FromContext(r.Context())
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if !ok {
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writeError(w, http.StatusUnauthorized, "unauthorized", "session cookie or X-API-Key required")
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return
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}
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h.serveSSE(w, r, id.FormatTeamID(ac.TeamID), false)
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}
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// AdminStream handles GET /v1/admin/events/stream. Upstream middleware
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// must enforce session auth + requireAdmin before reaching this handler.
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func (h *sseHandler) AdminStream(w http.ResponseWriter, r *http.Request) {
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ac, ok := auth.FromContext(r.Context())
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if !ok {
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writeError(w, http.StatusUnauthorized, "unauthorized", "admin session required")
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return
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}
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h.serveSSE(w, r, id.FormatTeamID(ac.TeamID), true)
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}
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func (h *sseHandler) serveSSE(w http.ResponseWriter, r *http.Request, teamID string, isAdmin bool) {
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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.StatusInternalServerError)
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return
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}
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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")
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subID, ch := h.broker.Subscribe(teamID, isAdmin)
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defer h.broker.Unsubscribe(subID)
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fmt.Fprintf(w, "event: connected\ndata: {\"message\":\"connected\"}\n\n")
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flusher.Flush()
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keepalive := time.NewTicker(sseKeepaliveInterval)
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defer keepalive.Stop()
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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 := <-ch:
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fmt.Fprintf(w, "event: %s\ndata: %s\n\n", msg.EventType, msg.Data)
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flusher.Flush()
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case <-keepalive.C:
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fmt.Fprintf(w, ": keepalive\n\n")
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flusher.Flush()
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}
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}
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}
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