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`crate::app::App`'s internals.
In the course of working on web push, I determined that we probably need to make `App` generic over the web push client we're using, so that tests can use a dummy client while the real app uses a client created at startup and maintained over the life of the program's execution. The most direct implementation of that is to render App as `App<P>`, where the parameter is occupied by the specific web push client type in use. However, doing this requires refactoring at _every_ site that mentions `App`, including every handler, even though the vast majority of those sites will not be concerned with web push.
I reviewed a few options with @wlonk:
* Accept the type parameter and apply it everywhere, as the cost of supporting web push.
* Hard-code the use of a specific web push client.
* Insulate handlers &c from `App` via provider traits, mimicing what we do for repository provider traits today.
* Treat each app type as a freestanding state in its own right, so that only push-related components need to consider push clients (as far as is feasible).
This is a prototype towards that last point, using a simple app component (boot) as a testbed. `FromRef` allows handlers that take a `Boot` to be used in routes that provide an `App`, so this is a contained change. However, the structure of `FromRef` prevents `Boot` from carrying any lifetime narrower than `'static`, so it now holds clones of the state fields it acquires from App, instead of references. This is fine - that's just a database pool, and sqlx's pool type is designed to be shared via cloning. From <https://docs.rs/sqlx/latest/sqlx/struct.Pool.html>:
> Cloning Pool is cheap as it is simply a reference-counted handle to the inner pool state.
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The taxonomy is now as follows:
* A _login_ is someone's identity for the purposes of authenticating to the service. Logins are not synchronized, and in fact are not published anywhere in the current API. They have a login ID, a name and a password.
* A _user_ is someone's identity for the purpose of participating in conversations. Users _are_ synchronized, as before. They have a user ID, a name, and a creation instant for the purposes of synchronization.
In practice, a user exists for every login - in fact, users' names are stored in the login table and are joined in, rather than being stored redundantly in the user table. A login ID and its corresponding user ID are always equal, and the user and login ID types support conversion and comparison to facilitate their use in this context.
Tokens are now associated with logins, not users. The currently-acting identity is passed down into app types as a login, not a user, and then resolved to a user where appropriate within the app methods.
As a side effect, the `GET /api/boot` method now returns a `login` key instead of a `user` key. The structure of the nested value is unchanged.
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Rust 1.89 added a new warning:
warning: hiding a lifetime that's elided elsewhere is confusing
--> src/setup/repo.rs:4:14
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4 | fn setup(&mut self) -> Setup;
| ^^^^^^^^^ ----- the same lifetime is hidden here
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| the lifetime is elided here
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= help: the same lifetime is referred to in inconsistent ways, making the signature confusing
help: use `'_` for type paths
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4 | fn setup(&mut self) -> Setup<'_>;
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I don't entirely agree with the style advice here, but lifetime elision style is an evolving area in Rust and I'd rather track the Rust team's recommendations than invent my own, so I've added all of them.
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I've split this from the schema and API changes because, frankly, it's huge. Annoyingly so. There are no semantic changes in this, it's all symbol changes, but there are a _lot_ of them because the term "channel" leaks all over everything in a service whose primary role is managing messages sent to channels (now, conversations).
I found a buggy test while working on this! It's not fixed in this commit, because it felt mean to hide a real change in the middle of this much chaff.
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This utility was needed to support a database migration with existing data. I have it on good authority that no further databases exist that are in the state that made this tool necessary.
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This also found a bug! No live event was being emitted during invite accept. The only way to find out about invites was to reconnect.
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This separates the code that figures out what happened to an entity from the code that represents it to a user, and makes it easier to compute a snapshot at a point in time (for things like bootstrap). It also makes the internal logic a bit easier to follow, since it's easier to tell whether you're working with a point in time or with the whole recorded history.
This hefty.
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This is primarily renames and repackagings.
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expires.
When tokens are revoked (logout or expiry), the server now publishes an internal event via the new `logins` event broadcaster. These events are used to guard the `/api/events` stream. When a token revocation event arrives for the token used to subscribe to the stream, the stream is cut short, disconnecting the client.
In service of this, tokens now have IDs, which are non-confidential values that can be used to discuss tokens without their secrets being passed around unnecessarily. These IDs are not (at this time) exposed to clients, but they could be.
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It now includes events for all channels. Clients are responsible for filtering.
The schema for channel events has changed; it now includes a channel name and ID, in the same format as the sender's name and ID. They also now include a `"type"` field, whose only valid value (as of this writing) is `"message"`.
This is groundwork for delivering message deletion (expiry) events to clients, and notifying clients of channel lifecycle events.
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vector-of-sequence-numbers stream resume.
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This API structure fell out of a conversation with Kit. Described loosely:
kit: ok
kit: Here's what I'm picturing in a client
kit: list channels, make-new-channel, zero to one active channels, post-to-active.
kit: login/sign-up, logout
owen: you will likely also want "am I logged in" here
kit: sure, whoami
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This is, again, groundwork for logic that requires more than just a database connection.
The login process has been changed to be more conventional, attempting login _before_ account creation rather than after it. This was not previously possible, because the data access methods used to perform these steps did not return enough information to carry out the workflow in that order. Separating storage from password validation and hashing forces the issue, and makes it clearer _at the App_ whether an account exists or not.
This does introduce the possibility of two racing inserts trying to lay claim to the same username. Transaction isolation should ensure that only one of them "wins," which is what you get before this change anyways.
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This is a jumping-off point for adding logic that needs more than just the DB for state, such as chat message handling.
The name sucks, but it's the best I've got.
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