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File size: 1,764 Bytes
e472a78 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | export const streamChunk = function* (chunk, chunkSize) {
let len = chunk.byteLength;
if (!chunkSize || len < chunkSize) {
yield chunk;
return;
}
let pos = 0;
let end;
while (pos < len) {
end = pos + chunkSize;
yield chunk.slice(pos, end);
pos = end;
}
};
export const readBytes = async function* (iterable, chunkSize) {
for await (const chunk of readStream(iterable)) {
yield* streamChunk(chunk, chunkSize);
}
};
const readStream = async function* (stream) {
if (stream[Symbol.asyncIterator]) {
yield* stream;
return;
}
const reader = stream.getReader();
try {
for (;;) {
const { done, value } = await reader.read();
if (done) {
break;
}
yield value;
}
} finally {
await reader.cancel();
}
};
export const trackStream = (stream, chunkSize, onProgress, onFinish) => {
const iterator = readBytes(stream, chunkSize);
let bytes = 0;
let done;
let _onFinish = (e) => {
if (!done) {
done = true;
onFinish && onFinish(e);
}
};
return new ReadableStream(
{
async pull(controller) {
try {
const { done, value } = await iterator.next();
if (done) {
_onFinish();
controller.close();
return;
}
let len = value.byteLength;
if (onProgress) {
let loadedBytes = (bytes += len);
onProgress(loadedBytes);
}
controller.enqueue(new Uint8Array(value));
} catch (err) {
_onFinish(err);
throw err;
}
},
cancel(reason) {
_onFinish(reason);
return iterator.return();
},
},
{
highWaterMark: 2,
}
);
};
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