Summary:
The old approach we were using to track unread counts by category was really complicated because it involved computing changes to counts in javascript and then syncing them back to the database, from each process that was making queries. Rather than try to fix that, this diff moves us to a new approach where the counts are maintained by executing a query before and after threads are modified to unapply / reapply them from the counters. Doing this in the database in the same transactions as the thread modifications themselves ensures the counts are internally consistent with the Threads table.
This SQL approach is also able to compute initial counts way faster - initializing totals and unreads in a 1GB edgehill.db in about 1 second on my machine.
Test Plan: All old tests removed, new tests coming
Reviewers: evan, juan
Reviewed By: juan
Differential Revision: https://phab.nylas.com/D2757
Summary:
1. **Generic CUD Tasks**: There is now a generic `CreateModelTask`,
`UpdateModelTask`, and `DestroyModelTask`. These can either be used as-is
or trivially overridden to easily update simple objects. Hopefully all of
the boilerplate rollback, error handling, and undo logic won't have to be
re-duplicated on every task. There are also tests for these tasks. We use
them to perform mutating actions on `Metadata` objects.
1. **Failing on Promise Rejects**: Turns out that if a Promise rejected
due to an error or `Promise.reject` we were ignoring it and letting tests
pass. Now, tests will Fail if any unhandled promise rejects. This
uncovered a variety of errors throughout the test suite that had to be
fixed. The most significant one was during the `theme-manager` tests when
all packages (and their stores with async DB requests) was loaded. Long
after the `theme-manager` specs finished, those DB requests were
(somtimes) silently failing.
1. **Globally stub `DatabaseStore._query`**: All tests shouldn't actually
make queries on the database. Furthremore, the `inTransaction` block
doesn't resolve at all unless `_query` is stubbed. Instead of manually
remembering to do this in every test that touches the DB, it's now mocked
in `spec_helper`. This broke a handful of tests that needed to be manually
fixed.
1. **ESLint Fixes**: Some minor fixes to the linter config to prevent
yelling about minor ES6 things and ensuring we have the correct parser.
Test Plan: new tests
Reviewers: bengotow, juan, drew
Differential Revision: https://phab.nylas.com/D2419
Remove cloudState and N1-Send-Later
Summary:
Until now, we've been hiding transactions beneath the surface. When you call persistModel, you're implicitly creating a transaction.
You could explicitly create them with `atomically`..., but there were several critical problems that are fixed in this diff:
- Calling persistModel / unpersistModel within a transaction could cause the DatabaseStore to trigger. This could result in other parts of the app making queries /during/
the transaction, potentially before the COMMIT occurred and saved the changes. The new, explicit inTransaction syntax holds all changes until after COMMIT and then triggers.
- Calling atomically and then calling persistModel inside that resulted in us having to check whether a transaction was present and was gross.
- Many parts of the code ran extensive logic inside a promise chained within `atomically`:
BAD:
```
DatabaseStore.atomically =>
DatabaseStore.persistModel(draft) =>
GoMakeANetworkRequestThatReturnsAPromise
```
OVERWHELMINGLY BETTER:
```
DatabaseStore.inTransaction (t) =>
t.persistModel(draft)
.then =>
GoMakeANetworkRequestThatReturnsAPromise
```
Having explicit transactions also puts us on equal footing with Sequelize and other ORMs. Note that you /have/ to call DatabaseStore.inTransaction (t) =>. There is no other way to access the methods that let you alter the database. :-)
Other changes:
- This diff removes Message.labels and the Message-Labels table. We weren't using Message-level labels anywhere, and the table could grow very large.
- This diff changes the page size during initial sync from 250 => 200 in an effort to make transactions a bit faster.
Test Plan: Run tests!
Reviewers: juan, evan
Reviewed By: juan, evan
Differential Revision: https://phab.nylas.com/D2353
Summary:
Add concept of "final" to Query, clean up internals
Tiny bug fixes
RxJs Observables!
WIP
Test Plan: Run tests
Reviewers: evan, juan
Reviewed By: juan
Differential Revision: https://phab.nylas.com/D2319
Summary:
reduce scope of changes
more changes
Test Plan: Run 1 new test
Reviewers: juan
Reviewed By: juan
Differential Revision: https://phab.nylas.com/D2290
Summary:
This diff replaces the UnreadCountStore with a better approach that is able to track unread counts for all folders/labels without continuous (and cripplingly slow) SELECT COUNT(*) queries.
When models are written to the database, we currently don't send out notifications with the "previous" state of those objects in the database. This makes it hard to determine how to update counters. (In the future, we may need to do this for live queries). Unfortunately, getting the "previous" state is going to be very hard, because multiple windows write to the database and the "previous" state we have might be outdated. We'd almost have to run a "SELECT" right before every "REPLACE INTO".
I created an API that allows you to register observers around persistModel and unpersistModel. With this API, you can run queries before and after the database changes are made and pluck just the "before" state you're interested in.
The `ThreadCountsStore` uses this API to determine the impact of persisting a set of threads on the unread counts of different labels. Before the threads are saved, it says "how much do these thread IDs contribute to unread counts currently?". After the write is complete it looks at the models and computes the difference between the old count impact and the new count impact, and updates the counters.
I decided not to attach the unread count to the Label objects themselves because 1) they update frequently and 2) most things observing the DatabaseStore for categories do not care about counts, so they would be updating unnecessarily.
The AccountSidebar now listens to the ThreadCountsStore as well as the CategoryStore, and there's a new preference in the General tab for turning off the counts.
Test Plan: Tests are a work in progress, want to get feedback first!
Reviewers: juan, evan
Reviewed By: evan
Differential Revision: https://phab.nylas.com/D2232
