Improve error handling #164
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idb-keyval reported IDBTransaction.error if a `set` operation failed. However, based on my reading of the IndexedDB spec, and based on testing, IDBTransaction.error may not be set at the time the `error` event fires. This can be seen under the following scenarios: - If IDBObjectStore.add fails because a key already exists - If a quota is exceeded in Safari - If the transaction is aborted immediately after an IndexedDB operation is requested The `error` event's EventTarget should give the specific IDBRequest that failed, and that IDBRequest's error property should always be populated, so accessing `event.target` should fix this issue. I tried using a similar approach for `abort` events, but it did not work; strangely, the abort event's target appears to be the IDBOpenRequest associated with the transaction, rather than the transaction itself, so it does not have a usable error property. This PR also adds limited unit tests to cover this scenario. Aborting a transaction immediately after issuing a database request appears to be a good way to force an error. Fixes jakearchibald#163
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idb-keyval reported IDBTransaction.error if a
setoperation failed. However, based on my reading of the IndexedDB spec, and based on testing, IDBTransaction.error may not be set at the time theerrorevent fires. This can be seen under the following scenarios:The
errorevent's EventTarget should give the specific IDBRequest that failed, and that IDBRequest's error property should always be populated, so accessingevent.targetshould fix this issue.I tried using a similar approach for
abortevents, but it did not work; strangely, the abort event's target appears to be the IDBOpenRequest associated with the transaction, rather than the transaction itself, so it does not have a usable error property.This PR also adds limited unit tests to cover this scenario. Aborting a transaction immediately after issuing a database request appears to be a good way to force an error.
Fixes #163