51 lines
1.9 KiB
JavaScript
51 lines
1.9 KiB
JavaScript
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/*
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2022-05-23
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The author disclaims copyright to this source code. In place of a
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legal notice, here is a blessing:
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* May you do good and not evil.
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* May you find forgiveness for yourself and forgive others.
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* May you share freely, never taking more than you give.
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***********************************************************************
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This is a JS Worker file for the main sqlite3 api. It loads
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sqlite3.js, initializes the module, and postMessage()'s a message
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after the module is initialized:
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{type: 'sqlite3-api', result: 'worker1-ready'}
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This seemingly superfluous level of indirection is necessary when
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loading sqlite3.js via a Worker. Instantiating a worker with new
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Worker("sqlite.js") will not (cannot) call sqlite3InitModule() to
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initialize the module due to a timing/order-of-operations conflict
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(and that symbol is not exported in a way that a Worker loading it
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that way can see it). Thus JS code wanting to load the sqlite3
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Worker-specific API needs to pass _this_ file (or equivalent) to the
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Worker constructor and then listen for an event in the form shown
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above in order to know when the module has completed initialization.
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This file accepts a URL arguments to adjust how it loads sqlite3.js:
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- `sqlite3.dir`, if set, treats the given directory name as the
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directory from which `sqlite3.js` will be loaded.
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*/
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//#if target=es6-bundler-friendly
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import {default as sqlite3InitModule} from './sqlite3-bundler-friendly.mjs';
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//#else
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"use strict";
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{
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const urlParams = globalThis.location
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? new URL(self.location.href).searchParams
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: new URLSearchParams();
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let theJs = 'sqlite3.js';
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if(urlParams.has('sqlite3.dir')){
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theJs = urlParams.get('sqlite3.dir') + '/' + theJs;
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}
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//console.warn("worker1 theJs =",theJs);
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importScripts(theJs);
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}
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//#endif
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sqlite3InitModule().then(sqlite3 => sqlite3.initWorker1API());
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