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Add a small test app demonstrating cooperative semi-concurrency of the opfs-sahpool VFS using its un/pauseVfs() APIs.
FossilOrigin-Name: 09570c55a23e5af76dd2153a5b28a493f498d7d4a08b0089f3074d0a2c5d3d29
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89
ext/wasm/tests/opfs/sahpool/sahpool-worker.js
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89
ext/wasm/tests/opfs/sahpool/sahpool-worker.js
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const searchParams = new URL(self.location.href).searchParams;
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const workerId = searchParams.get('workerId');
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const wPost = (type,...args)=>postMessage({type, workerId, payload:args});
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const log = (...args)=>wPost('log',...args);
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let capi, wasm, S, poolUtil;
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const sahPoolConfig = {
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name: 'opfs-sahpool-pausable',
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clearOnInit: false,
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initialCapacity: 3
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};
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importScripts(searchParams.get('sqlite3.dir') + '/sqlite3.js');
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const sqlExec = function(sql){
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const db = new poolUtil.OpfsSAHPoolDb('/my.db');
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try{
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return db.exec(sql);
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}finally{
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db.close();
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}
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};
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const clog = console.log.bind(console);
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globalThis.onmessage = function({data}){
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clog(workerId+": onmessage:",data);
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switch(data.type){
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case 'vfs-acquire':
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if( poolUtil ){
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poolUtil.unpauseVfs().then(()=>wPost('vfs-unpaused'));
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}else{
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S.installOpfsSAHPoolVfs(sahPoolConfig).then(pu=>{
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poolUtil = pu;
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wPost('vfs-acquired');
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});
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}
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break;
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case 'db-init':
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try{
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sqlExec([
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"DROP TABLE IF EXISTS mytable;",
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"CREATE TABLE mytable(a);",
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"INSERT INTO mytable(a) VALUES(11),(22),(33)"
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]);
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wPost('db-inited');
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}catch(e){
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wPost('error',e.message);
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}
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break;
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case 'db-query': {
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const rc = sqlExec({
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sql: 'select * from mytable order by a',
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rowMode: 'array',
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returnValue: 'resultRows'
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});
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wPost('query-result',rc);
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break;
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}
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case 'vfs-remove':
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poolUtil.removeVfs().then(()=>wPost('vfs-removed'));
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break;
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case 'vfs-pause':
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poolUtil.pauseVfs();
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wPost('vfs-paused');
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break;
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}
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};
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const hasOpfs = ()=>{
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return globalThis.FileSystemHandle
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&& globalThis.FileSystemDirectoryHandle
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&& globalThis.FileSystemFileHandle
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&& globalThis.FileSystemFileHandle.prototype.createSyncAccessHandle
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&& navigator?.storage?.getDirectory;
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};
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if( !hasOpfs() ){
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wPost('error',"OPFS not detected");
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}else{
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globalThis.sqlite3InitModule().then(async function(sqlite3){
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S = sqlite3;
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capi = S.capi;
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wasm = S.wasm;
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log("sqlite3 version:",capi.sqlite3_libversion(),
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capi.sqlite3_sourceid());
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//return sqlite3.installOpfsSAHPoolVfs(sahPoolConfig).then(pu=>poolUtil=pu);
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}).then(()=>{
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wPost('initialized');
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});
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}
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