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utils.js
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utils.js
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"use strict";
var log = console.log
var error = console.error
var queue = queueMicrotask ?? function(fn) { setTimeout(fn, 0) }
function add(tag, parent = document.body, html = "") {
var element = document.createElement(tag)
element.innerHTML = html
parent.append(element)
return element
}
// Download + retry on error
// type: json, text, blob, arraybuffer
function get(address, callback_ready, type = "blob") {
var statusbox = add("tr", document.querySelector(".log"))
var show_status = function(html) {
statusbox.innerHTML = "<td>Downloading [" + address + "]:</td>" + html
}
_get(address, callback_ready, type, show_status)
}
function _get(address, callback_ready, type, show_status) {
var xhr = new XMLHttpRequest();
xhr.onload = async function(event) {
var kilobytes = Math.round(event.loaded / 1024)
if (xhr.status >= 500) {
show_status("<td>Server error: " + xhr.status + "; retrying in 10s</td><td>---</td>")
// Frantically bashing an overloaded server will not help
// So retry in 10s unlike 3s for network errors
setTimeout(_get, 10000, address, callback_ready, type, show_status)
} else if (xhr.status >= 400) {
// No point in retrying on 404 or 403
show_status("<td>Server error: " + xhr.status + "; no retry</td><td>---</td>")
} else {
show_status("<td>100%</td><td>" + kilobytes + "KB</td>")
callback_ready(xhr.response)
}
}
xhr.onprogress = function(event) {
var progress = "---"
var kilobytes = Math.round(event.loaded / 1024)
if (event.total)
progress = Math.round(event.loaded / event.total * 100)
show_status("<td>" + progress + "%</td><td>" + kilobytes + "KB</td>")
}
xhr.onerror = function(event) {
show_status("<td>Network error! Retrying in 3s...</td><td>---</td>")
// No harm done in retrying a lot if there's no network
setTimeout(_get, 3000, address, callback_ready, type, show_status)
}
xhr.open('GET', address, true);
//xhr.overrideMimeType("application/json");
xhr.responseType = type
xhr.send(null);
show_status("<td>---%</td><td>Awaiting first bytes of data...</td>")
}