Add a test app to assist in validating the SAHPool digest calculation fix.

FossilOrigin-Name: a1e304b8020025cc73a658bd8c7697d59b4f3ad96cac0a3e36553a3207d13dc6

ext/wasm/tests/opfs/sahpool/digest-worker.js

@@ -0,0 +1,95 @@
+/*
+  2025-01-31
+
+  The author disclaims copyright to this source code.  In place of a
+  legal notice, here is a blessing:
+
+  *   May you do good and not evil.
+  *   May you find forgiveness for yourself and forgive others.
+  *   May you share freely, never taking more than you give.
+
+  ***********************************************************************
+
+  This file is part of sahpool-pausing.js's demonstration of the
+  pause/unpause feature of the opfs-sahpool VFS.
+*/
+const clog = console.log.bind(console);
+const wPost = (type,...args)=>postMessage({type, payload:args});
+const log = (...args)=>{
+  clog("Worker:",...args);
+  wPost('log',...args);
+}
+
+const hasOpfs = ()=>{
+  return globalThis.FileSystemHandle
+    && globalThis.FileSystemDirectoryHandle
+    && globalThis.FileSystemFileHandle
+    && globalThis.FileSystemFileHandle.prototype.createSyncAccessHandle
+    && navigator?.storage?.getDirectory;
+};
+if( !hasOpfs() ){
+  wPost('error',"OPFS not detected");
+  throw new Error("OPFS not detected");
+}
+
+clog("Importing sqlite3...");
+const searchParams = new URL(self.location.href).searchParams;
+importScripts(searchParams.get('sqlite3.dir') + '/sqlite3.js');
+
+const runTests = function(sqlite3, poolUtil){
+  const fname = '/my.db';
+  let db = new poolUtil.OpfsSAHPoolDb(fname);
+  let n = (new Date()).valueOf();
+  try {
+    db.exec([
+      "create table if not exists t(a);"
+    ]);
+    db.exec({
+      sql: "insert into t(a) values(?)",
+      bind: n++
+    });
+    log("Record count: ",db.selectValue("select count(*) from t"));
+  }finally{
+    db.close();
+  }
+
+  db = new poolUtil.OpfsSAHPoolDb(fname);
+  try {
+    db.exec({
+      sql: "insert into t(a) values(?)",
+      bind: n++
+    });
+    log("Record count: ",db.selectValue("select count(*) from t"));
+  }finally{
+    db.close();
+  }
+
+  const fname2 = '/my2.db';
+  db = new poolUtil.OpfsSAHPoolDb(fname2);
+  try {
+    db.exec([
+      "create table if not exists t(a);"
+    ]);
+    db.exec({
+      sql: "insert into t(a) values(?)",
+      bind: n++
+    });
+    log("Record count: ",db.selectValue("select count(*) from t"));
+  }finally{
+    db.close();
+  }
+};
+
+globalThis.sqlite3InitModule().then(async function(sqlite3){
+  log("sqlite3 version:",sqlite3.capi.sqlite3_libversion(),
+      sqlite3.capi.sqlite3_sourceid());
+  const sahPoolConfig = {
+    name: 'opfs-sahpool-digest',
+    clearOnInit: false,
+    initialCapacity: 6
+  };
+  return sqlite3.installOpfsSAHPoolVfs(sahPoolConfig).then(poolUtil=>{
+    log('vfs acquired');
+    runTests(sqlite3, poolUtil);
+  });
+});