39 lines
1.1 KiB
TypeScript
39 lines
1.1 KiB
TypeScript
const IMAGE_URL = `${process.env.REACT_APP_SOCKET_SERVER_URL}/test256.png`;
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const IMAGE_SIZE_BYTES = 141978;
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const calculateSpeed = (startTime: number, endTime: number) => {
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const duration = (endTime - startTime) / 1000;
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const imageSizeInBits = IMAGE_SIZE_BYTES * 8;
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let speed = imageSizeInBits / duration;
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// source: en.wikipedia.org/wiki/Data-rate_units#Conversion_table
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const suffix = ["B/s", "kB/s", "MB/s", "GB/s"];
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let index = 0;
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while (speed > 1000) {
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index++;
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speed = speed / 1000;
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}
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return `${speed.toFixed(index > 1 ? 1 : 0)} ${suffix[index]}`;
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};
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const processImage = (): Promise<string> => {
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return new Promise((resolve) => {
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const image = new Image();
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let endTime: number;
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image.onload = () => {
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endTime = new Date().getTime();
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const speed = calculateSpeed(startTime, endTime);
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resolve(speed);
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};
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image.onerror = () => {
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resolve("-1");
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};
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const startTime = new Date().getTime();
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image.src = `${IMAGE_URL}?t=${startTime}`;
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});
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};
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export const getNetworkSpeed = async (): Promise<string> => {
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return await processImage();
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};
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