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Code review of IndexedDB usage for cache storage purpose

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Use Promise.prototype.catch() to deal with potential exceptions.

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/416
This commit is contained in:
Raymond Hill 2019-03-21 17:49:19 -03:00
parent bbdb08c74a
commit 26c57feee8
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GPG key ID: 25E1490B761470C2
1 changed files with 15 additions and 18 deletions
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33
src/js/cachestorage.js
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@ -144,14 +144,6 @@
let dbPromise;
let dbTimer;
const genericErrorHandler = function(ev) {
const error = ev.target && ev.target.error;
if ( error && error.name === 'QuotaExceededError' ) {
api.error = error.name;
}
console.error('[%s]', STORAGE_NAME, error && error.name);
};
const noopfn = function () {
};
@ -216,20 +208,22 @@
return resolve(null);
}
req.onupgradeneeded = function(ev) {
req = undefined;
const db = ev.target.result;
db.onerror = db.onabort = genericErrorHandler;
const table = db.createObjectStore(
STORAGE_NAME,
{ keyPath: 'key' }
);
table.createIndex('value', 'value', { unique: false });
if ( ev.oldVersion === 1 ) { return; }
try {
const db = ev.target.result;
const table = db.createObjectStore(
STORAGE_NAME,
{ keyPath: 'key' }
);
table.createIndex('value', 'value', { unique: false });
} catch(ex) {
req.onerror();
}
};
req.onsuccess = function(ev) {
if ( resolve === undefined ) { return; }
req = undefined;
db = ev.target.result;
db.onerror = db.onabort = genericErrorHandler;
dbPromise = undefined;
resolve(db);
resolve = undefined;
@ -296,7 +290,7 @@
const visitAllFromDb = function(visitFn) {
getDb().then(db => {
if ( !db ) { return visitFn(); }
const transaction = db.transaction(STORAGE_NAME);
const transaction = db.transaction(STORAGE_NAME, 'readonly');
transaction.oncomplete =
transaction.onerror =
transaction.onabort = ( ) => visitFn();
@ -333,6 +327,9 @@
keyvalStore[result.key] = result.value;
})
);
}).catch(reason => {
console.info(`cacheStorage.getAllFromDb() failed: ${reason}`);
callback();
});
};