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WIP: un intento de evitar streamsaver si es posible

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no me genera mucha confianza este código pero era para prevenir usar streamsaver cuando no lo necesitamos con un hack en el servidor si está disponible
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Cat /dev/Nulo 2023-12-10 17:52:54 -03:00
parent 13dfb91a50
commit 8c251aae7f
1 changed files with 47 additions and 22 deletions
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69
frontend/src/lib/fetch.ts
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@ -1,4 +1,3 @@
import streamSaver from "streamsaver";
import { zData, type Distribution, zError, zDumpMetadata } from "common/schema";
export async function downloadFile(
@ -7,36 +6,62 @@ export async function downloadFile(
dist: Distribution,
) {
if (!dist.downloadURL) throw new Error("no downloadURL");
const outputS = streamSaver.createWriteStream(
dist.downloadURL.slice(dist.downloadURL.lastIndexOf("/") + 1),
);
const res = await fetchGzipped(
`${dataPath}/${datasetId}/${dist.identifier}/${
dist.fileName || dist.identifier
}.gz`,
);
await res.body!.pipeTo(outputS);
const downloadURL = `${dataPath}/${datasetId}/${dist.identifier}/${
dist.fileName || dist.identifier
}.gz`;
const localGzip = async () => {
const streamSaver = await import("streamsaver");
const outputS = streamSaver.createWriteStream(
dist.downloadURL!.slice(dist.downloadURL!.lastIndexOf("/") + 1),
);
const res = await fetchGzipped(downloadURL);
await res.body!.pipeTo(outputS);
};
if (navigator.userAgent.indexOf("Firefox") != -1) {
// firefox, por alguna razón inexplicable, no entiende el `content-encoding`
// cuando se intenta descargar un archivo. lo ignora y guarda el archivo
// comprimido. entonces tenemos que usar el hack de streamsaver. prefiero
// usarlo solo en firefox porque anda medio mal o no anda en otros navegadores.
await localGzip();
} else {
const infoRes = await fetch(downloadURL);
await infoRes.body?.cancel();
if (infoRes.headers.get("Content-Type") === "application/gzip-hack") {
// server tiene el hack de gzip=true activado, genial
location.href = `${downloadURL}?gzip=true`;
} else {
await localGzip();
}
}
}
async function fetchGzipped(url: string): Promise<Response> {
let res = await fetch(url);
let res = await fetch(`${url}?gzip=true`);
if (res.status === 404 && url.endsWith(".gz")) {
// probar cargando el archivo no comprimido
res = await fetch(url.slice(0, url.length - ".gz".length));
return res;
}
let DecStream;
if ("DecompressionStream" in window) DecStream = window.DecompressionStream;
else {
const { makeDecompressionStream } = await import(
"compression-streams-polyfill/ponyfill"
);
DecStream = makeDecompressionStream(TransformStream);
if (res.headers.get("Content-Type") === "application/gzip-hack") {
// server tiene el hack de gzip=true activado, genial
return res;
} else {
// server no tiene el hack, usamos DecompressionStream
let DecStream;
if ("DecompressionStream" in window) DecStream = window.DecompressionStream;
else {
const { makeDecompressionStream } = await import(
"compression-streams-polyfill/ponyfill"
);
DecStream = makeDecompressionStream(TransformStream);
}
const ds = new DecStream("gzip");
const decompressedStream = res.body!.pipeThrough(ds);
const resD = new Response(decompressedStream);
return resD;
}
const ds = new DecStream("gzip");
const decompressedStream = res.body!.pipeThrough(ds);
const resD = new Response(decompressedStream);
return resD;
}
let cachedGzippedJson = new Map<string, { date: Date; data: unknown }>();