Dartifying some IndexedDB APIs.

tests/html/indexeddb_3_test.dart

 library IndexedDB3Test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
-import 'dart:html';
+import 'dart:async';
+import 'dart:html' as html;
 import 'dart:indexed_db';
+import 'utils.dart';
 
 // Read with cursor.
 
 const String DB_NAME = 'Test';
 const String STORE_NAME = 'TEST';
 const int VERSION = 1;
 
-class Test {
-  fail(message) => (e) {
-    guardAsync(() {
-      expect(false, isTrue, reason: 'IndexedDB failure: $message');
-    });
-  };
 
-  _createObjectStore(db) {
-    try {
-      // Nuke object store if it already exists.
-      db.deleteObjectStore(STORE_NAME);
-    }
-    // TODO:
-    //on DomException catch(e) { } // Chrome and Firefox
-    catch(e) { } // Chrome and Firefox
-    db.createObjectStore(STORE_NAME);
+Future<Database> createAndOpenDb() {
+  return html.window.indexedDB.deleteDatabase(DB_NAME).then((_) {
+    return html.window.indexedDB.open(DB_NAME, version: VERSION,
+        onUpgradeNeeded: (e) {
+          var db = e.target.result;
+          db.createObjectStore(STORE_NAME);
+        });
+  });
+}
+
+Future<Database> writeItems(Database db) {
+  Future<Object> write(index) {
+    var transaction = db.transaction([STORE_NAME], 'readwrite');
+    return transaction.objectStore(STORE_NAME).put('Item $index', index);
   }
 
-  var db;
-
-  _openDb(afterOpen()) {
-    var request = window.indexedDB.open(DB_NAME, VERSION);
-    if (request is OpenDBRequest) {
-      // New upgrade protocol. FireFox 15, Chrome 24, hopefully IE10.
-      request.onSuccess.listen(expectAsync1((e) {
-            db = e.target.result;
-            afterOpen();
-          }));
-      request.onUpgradeNeeded.listen((e) {
-          guardAsync(() {
-              _createObjectStore(e.target.result);
-            });
-        });
-      request.onError.listen(fail('open'));
-    } else {
-      // Legacy setVersion upgrade protocol. Chrome < 23.
-      request.onSuccess.listen(expectAsync1((e) {
-            db = e.target.result;
-            if (db.version != '$VERSION') {
-              var setRequest = db.setVersion('$VERSION');
-              setRequest.onSuccess.listen(
-                  expectAsync1((e) {
-                      _createObjectStore(db);
-                      var transaction = e.target.result;
-                      transaction.onComplete.listen(
-                          expectAsync1((e) => afterOpen()));
-                      transaction.onError.listen(fail('Upgrade'));
-                    }));
-              setRequest.onError.listen(fail('setVersion error'));
-            } else {
-              afterOpen();
-            }
-          }));
-      request.onError.listen(fail('open'));
-    }
+  var future = write(0);
+  for (var i = 1; i < 100; ++i) {
+    future = future.then((_) => write(i));
   }
 
-  _createAndOpenDb(afterOpen()) {
-    var request = window.indexedDB.deleteDatabase(DB_NAME);
-    request.onSuccess.listen(expectAsync1((e) { _openDb(afterOpen); }));
-    request.onError.listen(fail('delete old Db'));
-  }
+  // Chain on the DB so we return it at the end.
+  return future.then((_) => db);
+}
 
-  writeItems(int index) {
-    if (index < 100) {
-      var transaction = db.transaction([STORE_NAME], 'readwrite');
-      var request = transaction.objectStore(STORE_NAME)
-          .put('Item $index', index);
-      request.onSuccess.listen(expectAsync1((e) {
-          writeItems(index + 1);
-        }
-      ));
-      request.onError.listen(fail('put'));
-    }
-  }
+Future<Database> setupDb() {
+  return createAndOpenDb().then(writeItems);
+}
 
-  setupDb() { _createAndOpenDb(() => writeItems(0)); }
+Future<Database> readAllViaCursor(Database db) {
+  Transaction txn = db.transaction(STORE_NAME, 'readonly');
+  ObjectStore objectStore = txn.objectStore(STORE_NAME);
+  int itemCount = 0;
+  int sumKeys = 0;
 
-  readAllViaCursor() {
-    Transaction txn = db.transaction(STORE_NAME, 'readonly');
-    ObjectStore objectStore = txn.objectStore(STORE_NAME);
-    Request cursorRequest = objectStore.openCursor();
-    int itemCount = 0;
-    int sumKeys = 0;
-    int lastKey = null;
-    cursorRequest.onSuccess.listen(expectAsync1((e) {
-      var cursor = e.target.result;
-      if (cursor != null) {
-        lastKey = cursor.key;
-        itemCount += 1;
-        sumKeys += cursor.key;
-        window.console.log('${cursor.key}  ${cursor.value}');
-        expect(cursor.value, 'Item ${cursor.key}');
-        cursor.continueFunction();
-      } else {
-        // Done
-        expect(lastKey, 99);
-        expect(itemCount, 100);
-        expect(sumKeys, (100 * 99) ~/ 2);
-      }
-    }, count:101));
-    cursorRequest.onError.listen(fail('openCursor'));
-  }
+  var cursors = objectStore.openCursor().asBroadcastStream();
+  cursors.listen(
+    (cursor) {
+      ++itemCount;
+      sumKeys += cursor.key;
+      expect(cursor.value, 'Item ${cursor.key}');
+      cursor.next();
+    });
+  cursors.last.then(
+    (cursor) {
+      expect(cursor.key, 99);
+      expect(sumKeys, (100 * 99) ~/ 2);
+      expect(itemCount, 100);
+    });
 
-  readAllReversedViaCursor() {
-    Transaction txn = db.transaction(STORE_NAME, 'readonly');
-    ObjectStore objectStore = txn.objectStore(STORE_NAME);
-    // TODO: create a KeyRange(0,100)
-    Request cursorRequest = objectStore.openCursor(null, 'prev');
-    int itemCount = 0;
-    int sumKeys = 0;
-    int lastKey = null;
-    cursorRequest.onSuccess.listen(expectAsync1((e) {
-      var cursor = e.target.result;
-      if (cursor != null) {
-        lastKey = cursor.key;
-        itemCount += 1;
-        sumKeys += cursor.key;
-        expect(cursor.value, 'Item ${cursor.key}');
-        cursor.continueFunction();
-      } else {
-        // Done
-        expect(lastKey, 0);  // i.e. first key (scanned in reverse).
-        expect(itemCount, 100);
-        expect(sumKeys, (100 * 99) ~/ 2);
-      }
-    }, count:101));
-    cursorRequest.onError.listen(fail('openCursor'));
-  }
+  return cursors.last.then((_) => db);
+}
+
+Future<Database> readAllReversedViaCursor(Database db) {
+  Transaction txn = db.transaction(STORE_NAME, 'readonly');
+  ObjectStore objectStore = txn.objectStore(STORE_NAME);
+  int itemCount = 0;
+  int sumKeys = 0;
+
+  var cursors = objectStore.openCursor(direction: 'prev').asBroadcastStream();
+  cursors.listen(
+    (cursor) {
+      ++itemCount;
+      sumKeys += cursor.key;
+      expect(cursor.value, 'Item ${cursor.key}');
+      cursor.next();
+    });
+  cursors.last.then(
+    (cursor) {
+      expect(cursor.key, 0);
+      expect(sumKeys, (100 * 99) ~/ 2);
+      expect(itemCount, 100);
+    });
+  return cursors.last.then((_) => db);
 }
 
 main() {
   useHtmlConfiguration();
 
   // Don't bother with these tests if it's unsupported.
   // Support is tested in indexeddb_1_test
   if (IdbFactory.supported) {
-    var test_ = new Test();
-    test('prepare', test_.setupDb);
-    test('readAll1', test_.readAllViaCursor);
-    test('readAll2', test_.readAllReversedViaCursor);
+    var db;
+    futureTest('prepare', () {
+      return setupDb().then((result) { db = result; });
+    });
+    futureTest('readAll1', () {
+      return readAllViaCursor(db);
+    });
+
+    futureTest('readAll2', () {
+      return readAllReversedViaCursor(db);
+    });
   }
 }