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Longterm React Suspense with Deno.
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import { Server } from "https://deno.land/std@0.148.0/http/mod.ts"; | |
import React from "https://esm.sh/react@18.2.0"; | |
import { renderToReadableStream } from "https://esm.sh/react-dom@18.2.0/server" | |
async function wake(): Promise<boolean> { | |
console.log("process..."); | |
await new Promise(resolve => setTimeout(resolve, 2000)); | |
return false; | |
} | |
const cache = new Map<string, boolean>(); | |
function Woke({ id, children }: { id: string, children: JSX.Element }) { | |
if (!cache.has(id)) { | |
throw wake().then(v => void cache.set(id, v)); | |
} | |
const woke = cache.get(id) ?? false; | |
cache.delete(id); | |
if (!woke) { | |
// If client aborted, then error occurred. | |
return <>​<Woke id={id}>{children}</Woke></>; | |
} | |
return children; | |
} | |
function Index() { | |
const id = crypto.randomUUID().toString(); | |
return ( | |
<React.Suspense fallback={<>Loading...</>}> | |
<Woke id={id}> | |
<>It is works!</> | |
</Woke> | |
</React.Suspense> | |
); | |
} | |
function Document({ children }: { children: JSX.Element}) { | |
return ( | |
<html> | |
<head> | |
<title>title</title> | |
</head> | |
<body>{children}</body> | |
</html> | |
); | |
} | |
async function handler(request: Request): Promise<Response> { | |
const stream = await renderToReadableStream(<Document><Index /></Document>, { | |
signal: request.signal, | |
}); | |
return new Response(stream, { | |
headers: { | |
"Content-Type": "text/html; charset=utf-8", | |
}, | |
}); | |
} | |
const server = new Server({ | |
port: 3000, | |
handler, | |
}); | |
await server.listenAndServe(); |
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