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53 lines
1.3 KiB
53 lines
1.3 KiB
<script context="module">
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import { createEventDispatcher, onMount } from "svelte";
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import { Mutex } from "$/client/helpers.js";
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// this prevents loading it multiple times
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const ready = {};
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const lock = new Mutex();
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export const inject_remote = async (document, src, ready_cb=undefined) => {
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if(ready[src]) {
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// no need to lock, it's done already
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if(ready_cb) ready_cb();
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} else {
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// locking time, maybe it's not ready
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await lock.hold();
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if(ready[src]) {
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// looks like someone else did it already, done
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lock.release();
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if(ready_cb) ready_cb();
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} else {
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// nope, not really ready, so we must be first
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let head = document.getElementsByTagName('head')[0];
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let script = document.createElement('script');
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script.onload = async () => {
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ready[src] = true;
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// script came back and we signal it's ready, unlock
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lock.release();
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if(ready_cb) ready_cb();
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}
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script.src = src;
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script.type = 'text/javascript';
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head.append(script);
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}
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}
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await lock.wait();
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}
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</script>
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<script>
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export let src = "";
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const dispatch = createEventDispatcher();
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onMount(async () => {
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await inject_remote(document, src, () => {
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dispatch("load");
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});
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});
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</script>
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