| 18 | }; |
| 19 | |
| 20 | export function sse({ request, pingInterval = 1000, updateInterval = 348, run }: SseProps) { |
| 21 | if (env.DISABLE_SSE === "1" || env.DISABLE_SSE === "true") { |
| 22 | return new Response("SSE disabled", { status: 200 }); |
| 23 | } |
| 24 | |
| 25 | let pinger: NodeJS.Timer | undefined = undefined; |
| 26 | let updater: NodeJS.Timer | undefined = undefined; |
| 27 | let timeout: NodeJS.Timeout | undefined = undefined; |
| 28 | |
| 29 | const abort = () => { |
| 30 | clearInterval(pinger); |
| 31 | clearInterval(updater); |
| 32 | clearTimeout(timeout); |
| 33 | }; |
| 34 | |
| 35 | return eventStream(request.signal, (send, close) => { |
| 36 | const safeSend = (args: { event?: string; data: string }) => { |
| 37 | try { |
| 38 | send(args); |
| 39 | } catch (error) { |
| 40 | if (error instanceof Error) { |
| 41 | if (error.name !== "TypeError") { |
| 42 | logger.debug("Error sending SSE, aborting", { |
| 43 | error: { |
| 44 | name: error.name, |
| 45 | message: error.message, |
| 46 | stack: error.stack, |
| 47 | }, |
| 48 | args, |
| 49 | }); |
| 50 | } |
| 51 | } else { |
| 52 | logger.debug("Unknown error sending SSE, aborting", { |
| 53 | error, |
| 54 | args, |
| 55 | }); |
| 56 | } |
| 57 | |
| 58 | close(); |
| 59 | } |
| 60 | }; |
| 61 | |
| 62 | pinger = setInterval(() => { |
| 63 | if (request.signal.aborted) { |
| 64 | return abort(); |
| 65 | } |
| 66 | |
| 67 | safeSend({ event: "ping", data: new Date().toISOString() }); |
| 68 | }, pingInterval); |
| 69 | |
| 70 | updater = setInterval(() => { |
| 71 | if (request.signal.aborted) { |
| 72 | return abort(); |
| 73 | } |
| 74 | |
| 75 | run(safeSend, abort); |
| 76 | }, updateInterval); |
| 77 | |