Bug 201002 – Try to recover nicely when getting an unexpected schema in the service workers database

• Component: WebKit2
• Status: RESOLVED FIXED

[Chris Dumez]

Try to recover nicely when getting an unexpected schema in the service workers database instead of crashing the network process.

[Radar WebKit Bug Importer]

<rdar://problem/54574991>

[Chris Dumez]

Created attachment 376935 [details]
Patch

[Chris Dumez]

Created attachment 376941 [details]
Patch

[youenn fablet]

Comment on attachment 376941 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=376941&action=review

> Source/WebCore/workers/service/server/RegistrationDatabase.cpp:173
> +        openSQLiteDatabase(fullFilename);

It seems a bit strange to be able to recover ensureValidRecordsTable but not importRecords error.
An error in importRecords is probably unrecoverable as well. In that case, we currently proceed with zero registration but we will no longer be able to push changes since push changes try to import before pushing changes.

m_database->open error cases seem more difficult.
Some error cases are recoverable (process suspension) but others are probably not recoverable.
It might be safer to not flush it for now.

We could cover all these cases by calling SQLiteFileSystem::deleteDatabaseFile(fullFilename) in scopeExit conditionally on a boolean storing whether recoverable or not.

As a side note, it seems that if process suspension happens exactly at the time we try to open the database to import the service worker registrations, we will load zero registrations.
Then, when being unsuspended, we will consider that there are zero registrations. At the first push change, we will import the registrations before pushing the changes.
I am not sure this code path is correct. Maybe we should make sure to restart import at unsuspension time.

[Chris Dumez]

Created attachment 377032 [details]
Patch

[Chris Dumez]

Created attachment 377034 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 377034 [details]
Patch

Clearing flags on attachment: 377034

Committed r249035: <https://trac.webkit.org/changeset/249035>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.