Benjamin Bouvier 73ad51879a feat: implement time lease based locks for the CryptoStore (#2140) ...

This implements a new time lease based lock for the `CryptoStore`, that doesn't require explicit unlocking, so that's more robust in the context of #1928, where any process may die because the device is running out of battery, or unexpected flows cause a lock to not be released properly in one or the other process.

```
//! This is a per-process lock that may be used only for very specific use
//! cases, where multiple processes might concurrently write to the same
//! database at the same time; this would invalidate crypto store caches, so
//! that should be done mindfully. Such a lock can be acquired multiple times by
//! the same process, and it remains active as long as there's at least one user
//! in a given process.
//!
//! The lock is implemented using time-based leases to values inserted in a
//! crypto store. The store maintains the lock identifier (key), who's the
//! current holder (value), and an expiration timestamp on the side; see also
//! `CryptoStore::try_take_leased_lock` for more details.
//!
//! The lock is initially acquired for a certain period of time (namely, the
//! duration of a lease, aka `LEASE_DURATION_MS`), and then a "heartbeat" task
//! renews the lease to extend its duration, every so often (namely, every
//! `EXTEND_LEASE_EVERY_MS`). Since the tokio scheduler might be busy, the
//! extension request should happen way more frequently than the duration of a
//! lease, in case a deadline is missed. The current values have been chosen to
//! reflect that, with a ratio of 1:10 as of 2023-06-23.
//!
//! Releasing the lock happens naturally, by not renewing a lease. It happens
//! automatically after the duration of the last lease, at most.
```

---

* feat: implement a time lease based lock for the crypto store
* feat: switch the crypto-store lock a time-leased based one
* chore: fix CI, don't use unixepoch in sqlite and do time math in rust
* chore: dummy implementation in indexeddb, don't run lease locks tests there
* feat: in NSE, wait the duration of a lease if first attempt to unlock failed
* feat: immediately release the lock when there are no more holders
* chore: clippy
* chore: add comment about atomic sanity
* chore: increase sleeps in timeline queue tests?
* feat: lower lease and renew durations
* feat: keep track of the extend-lease task
* fix: increment num_holders when acquiring the lock for the first time
* chore: reduce indent + abort prev renew task on non-wasm + add logs

2023-06-29 13:05:44 +00:00

..

crypto_store

feat: implement time lease based locks for the CryptoStore (#2140)

2023-06-29 13:05:44 +00:00

state_store

base: Do not separate stripped room info

2023-06-14 10:45:37 +02:00