71 lines
1.7 KiB
TypeScript
71 lines
1.7 KiB
TypeScript
import { fetchListeners, fetchNowPlaying } from "@/lib/services/radio";
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export const dynamic = "force-dynamic";
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/**
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* Server-Sent Events stream of live radio state (AtomCMS's radio SSE endpoint).
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* Pushes { nowPlaying, listeners } every ~10s so players/widgets get real-time
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* updates without polling. Closes cleanly when the client disconnects.
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*/
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export async function GET(req: Request) {
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const encoder = new TextEncoder();
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const stream = new ReadableStream<Uint8Array>({
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async start(controller) {
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let closed = false;
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const send = async () => {
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if (closed) return;
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const [nowPlaying, listeners] = await Promise.all([
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fetchNowPlaying().catch(() => null),
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fetchListeners().catch(() => null),
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]);
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try {
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controller.enqueue(
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encoder.encode(
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`data: ${JSON.stringify({ nowPlaying, listeners })}\n\n`,
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),
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);
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} catch {
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closed = true;
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}
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};
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// Initial event immediately, then on an interval.
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await send();
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const interval = setInterval(() => void send(), 10_000);
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// SSE comment as a keep-alive ping between data events.
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const ping = setInterval(() => {
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if (!closed) {
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try {
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controller.enqueue(encoder.encode(": ping\n\n"));
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} catch {
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closed = true;
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}
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}
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}, 25_000);
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const stop = () => {
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closed = true;
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clearInterval(interval);
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clearInterval(ping);
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try {
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controller.close();
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} catch {
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/* already closed */
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}
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};
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req.signal.addEventListener("abort", stop);
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},
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});
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return new Response(stream, {
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headers: {
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"content-type": "text/event-stream; charset=utf-8",
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"cache-control": "no-store, no-transform",
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connection: "keep-alive",
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"access-control-allow-origin": "*",
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},
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});
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}
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