72 lines
2.3 KiB
JavaScript
72 lines
2.3 KiB
JavaScript
/*
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2022-09-17
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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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A testing ground for the OPFS VFS.
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Summary of how this works:
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This file uses the sqlite3.StructBinder-created struct wrappers for
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sqlite3_vfs, sqlite3_io_methods, ans sqlite3_file to set up a
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conventional sqlite3_vfs (except that it's implemented in JS). The
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methods which require OPFS APIs use a separate worker (hereafter called the
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OPFS worker) to access that functionality. This worker and that one
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use SharedArrayBuffer.
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*/
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'use strict';
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const tryOpfsVfs = function(sqlite3){
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const toss = function(...args){throw new Error(args.join(' '))};
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const logPrefix = "OPFS tester:";
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const log = (...args)=>console.log(logPrefix,...args);
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const warn = (...args)=>console.warn(logPrefix,...args);
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const error = (...args)=>console.error(logPrefix,...args);
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log("tryOpfsVfs()");
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const capi = sqlite3.capi;
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const pVfs = capi.sqlite3_vfs_find("opfs") || toss("Unexpectedly missing 'opfs' VFS.");
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const oVfs = capi.sqlite3_vfs.instanceForPointer(pVfs) || toss("Unexpected instanceForPointer() result.");;
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log("OPFS VFS:",pVfs, oVfs);
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const dbFile = "my-persistent.db";
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const db = new sqlite3.oo1.DB(dbFile, "c", "opfs");
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log("db file:",db.filename);
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try{
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let n = db.selectValue("select count(*) from sqlite_schema");
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if(n){
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log("Persistent data found. sqlite_schema entry count =",n);
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}
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db.transaction((db)=>{
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db.exec({
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sql:[
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"create table if not exists t(a);",
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"insert into t(a) values(?),(?),(?);",
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],
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bind: [performance.now() | 0,
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(performance.now() |0) / 2,
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(performance.now() |0) / 4]
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});
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});
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log("count(*) from t =",db.selectValue("select count(*) from t"));
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}finally{
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db.close();
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}
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log("Done!");
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}/*tryOpfsVfs()*/;
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importScripts('sqlite3.js');
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self.sqlite3InitModule().then((EmscriptenModule)=>{
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EmscriptenModule.sqlite3.installOpfsVfs()
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.then((sqlite3)=>tryOpfsVfs(sqlite3))
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.catch((e)=>{
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console.error("Error initializing OPFS VFS:",e);
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});
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});
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