detect the webkit bug, and await a bogus request when opening a txn

This commit is contained in:
Bruno Windels 2021-03-04 19:49:13 +01:00
parent e0d14207ac
commit 932d26ed8c
3 changed files with 60 additions and 2 deletions

View file

@ -16,10 +16,14 @@ limitations under the License.
import {Transaction} from "./Transaction.js";
import { STORE_NAMES, StorageError } from "../common.js";
import { reqAsPromise } from "./utils.js";
const WEBKITEARLYCLOSETXNBUG_BOGUS_KEY = "782rh281re38-boguskey";
export class Storage {
constructor(idbDatabase) {
constructor(idbDatabase, hasWebkitEarlyCloseTxnBug) {
this._db = idbDatabase;
this._hasWebkitEarlyCloseTxnBug = hasWebkitEarlyCloseTxnBug;
const nameMap = STORE_NAMES.reduce((nameMap, name) => {
nameMap[name] = name;
return nameMap;
@ -38,6 +42,11 @@ export class Storage {
this._validateStoreNames(storeNames);
try {
const txn = this._db.transaction(storeNames, "readonly");
// https://bugs.webkit.org/show_bug.cgi?id=222746 workaround,
// await a bogus idb request on the new txn so it doesn't close early if we await a microtask first
if (this._hasWebkitEarlyCloseTxnBug) {
await reqAsPromise(txn.objectStore(storeNames[0]).get(WEBKITEARLYCLOSETXNBUG_BOGUS_KEY));
}
return new Transaction(txn, storeNames);
} catch(err) {
throw new StorageError("readTxn failed", err);
@ -48,6 +57,11 @@ export class Storage {
this._validateStoreNames(storeNames);
try {
const txn = this._db.transaction(storeNames, "readwrite");
// https://bugs.webkit.org/show_bug.cgi?id=222746 workaround,
// await a bogus idb request on the new txn so it doesn't close early if we await a microtask first
if (this._hasWebkitEarlyCloseTxnBug) {
await reqAsPromise(txn.objectStore(storeNames[0]).get(WEBKITEARLYCLOSETXNBUG_BOGUS_KEY));
}
return new Transaction(txn, storeNames);
} catch(err) {
throw new StorageError("readWriteTxn failed", err);

View file

@ -18,6 +18,7 @@ import {Storage} from "./Storage.js";
import { openDatabase, reqAsPromise } from "./utils.js";
import { exportSession, importSession } from "./export.js";
import { schema } from "./schema.js";
import { detectWebkitEarlyCloseTxnBug } from "./quirks.js";
const sessionName = sessionId => `hydrogen_session_${sessionId}`;
const openDatabaseWithSessionId = sessionId => openDatabase(sessionName(sessionId), createStores, schema.length);
@ -50,8 +51,10 @@ export class StorageFactory {
console.warn("no persisted storage, database can be evicted by browser");
}
});
const hasWebkitEarlyCloseTxnBug = await detectWebkitEarlyCloseTxnBug();
const db = await openDatabaseWithSessionId(sessionId);
return new Storage(db);
return new Storage(db, hasWebkitEarlyCloseTxnBug);
}
delete(sessionId) {

View file

@ -0,0 +1,41 @@
/*
Copyright 2020 The Matrix.org Foundation C.I.C.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import {openDatabase, txnAsPromise, reqAsPromise} from "./utils.js";
// filed as https://bugs.webkit.org/show_bug.cgi?id=222746
export async function detectWebkitEarlyCloseTxnBug() {
const dbName = "hydrogen_webkit_test_inactive_txn_bug";
try {
const db = await openDatabase(dbName, db => {
db.createObjectStore("test", {keyPath: "key"});
}, 1);
const readTxn = db.transaction(["test"], "readonly");
await reqAsPromise(readTxn.objectStore("test").get("somekey"));
// schedule a macro task in between the two txns
await new Promise(r => setTimeout(r, 0));
const writeTxn = db.transaction(["test"], "readwrite");
await Promise.resolve();
writeTxn.objectStore("test").add({key: "somekey", value: "foo"});
await txnAsPromise(writeTxn);
} catch (err) {
if (err.name === "TransactionInactiveError") {
return true;
}
}
return false;
}