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import speedometer from "./speedometer.js";
import throttle from "./throttle.js";
import utils from "../utils.js";
export const progressEventReducer = (listener, isDownloadStream, freq = 3) => {
let bytesNotified = 0;
const _speedometer = speedometer(50, 250);
return throttle(e => {
const loaded = e.loaded;
const total = e.lengthComputable ? e.total : undefined;
const progressBytes = loaded - bytesNotified;
const rate = _speedometer(progressBytes);
const inRange = loaded <= total;
bytesNotified = loaded;
const data = {
loaded,
total,
progress: total ? (loaded / total) : undefined,
bytes: progressBytes,
rate: rate ? rate : undefined,
estimated: rate && total && inRange ? (total - loaded) / rate : undefined,
event: e,
lengthComputable: total != null,
[isDownloadStream ? 'download' : 'upload']: true
};
listener(data);
}, freq);
}
export const progressEventDecorator = (total, throttled) => {
const lengthComputable = total != null;
return [(loaded) => throttled[0]({
lengthComputable,
total,
loaded
}), throttled[1]];
}
export const asyncDecorator = (fn) => (...args) => utils.asap(() => fn(...args));