Commit 55a8deb8 authored by Committed by Gerrit Code Review
(Bug1352028) Add a JSON progress bar for bulk operations.
This patch adds a JSON progress meter (I'll call it that to avoid confusion with progress bars) to the bulk uploading of users, groups and group memberships and the bulk export and import of users (LEAP), so the user can see the progress of the operation and not just the submit button changed to 'Processing..' and whatever indication their browser gives while waiting for content. The bulk export and import are minor rewrites, replacing the old iframe based progress bar and the associated multiple pages and additional template file in the case of the bulk export, and the recursive redirect-to-self of the bulk import. To accomplish the display of the progress bar during the operation, we make the PHP session be closed (read only) except when changes need to be made. This is for the most part a straightforward change in session.php as it's the only direct accessor. In other places, we replace direct accessing of the session variable ($_SESSION) with use of the session class ($SESSION) so that it can reopen the session, make the change and close the session again. There is one more aspect to all of this: with previous behaviour, multiple requests for the same session would queue, taking the session lock in turn. After this patch is applied, they can proceed in parallel, allowing greater throughput. There is no additional locking requirement because the issues are the same as those already dealt with in allowing multiple PHP threads to process requests from different sessions at the same time. I have sought to make the progress meter nice and generic, so it can be used in the other bulk imports and exports too. Paradoxically, these changes don't just make the import seem to be faster, it actually is.. at least in the case of users and groups. Times for importing 1000 users, groups and memberships, averaged over 3 runs each (Wall time, not CPU time - but the relationship is the same). Without Progress With Progress Users 166s 155s Groups 85s 78s Memberships 20s 19s Change-Id: Iec15c57db32c77994edb80c71d65591de51a95e4 Signed-off-by: Nigel Cunningham <email@example.com>
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