| Commit message (Collapse) | Author | Age |
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Unlike the previous example, this involves cloning an event broadcaster, as well. This is, per the documentation, how the type may be used. From <https://docs.rs/tokio/latest/tokio/sync/broadcast/fn.channel.html>:
> The Sender can be cloned to send to the same channel from multiple points in the process or it can be used concurrently from an `Arc`.
The language is less firm than the language sqlx uses for its pool, but the intent is clear enough, and it works in practice.
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This conversion, from an iterator of type-specific events (say, `user::Event` or `message::Event`), into a `Vec<event::Event>`, is prevasive, and it needs to be done each time. Having Broadcaster expose a support method for this cuts down on the repetition, at the cost of a slightly alarming amount of type-system nonsense in `broadcast_from`.
Historical footnote: the internal message structure is a Vec and not an individual message so that bulk operations, like expiring channels and messages, won't disconnect everyone if they happen to dispatch more than sixteen messages (current queue depth limit) at once. We trade allocation and memory pressure for keeping the connections alive. _Most_ event publishing is an iterator of one item, so the Vec allocation is redundant.
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I found a test bug! The tests for deleting previously-deleted or previously-expired tests were using the wrong user to try to delete those messages. The tests happened to pass anyways because the message authorship check was done after the message lifecycle check. They would have no longer passed; the tests are fixed to use the sender, instead.
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This replaces the approach of having the repo type know about conversation lifecycle in detail. Instead, the repo type accepts events and applies them to the DB blindly. The SQL written to implement each event does, however, embed assumptions about what order events will happen in.
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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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I've been doing this by hand anyways, and this makes it a _ton_ less tedious to maintain. I think it looks nice.
This does, however, require nightly - for formatting only.
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These were separated as there wasn't an obvious way to serialize two fields with the same _type_ with different _prefixes_. Turns out this is a common problem, and someone's written a crate for it that remaps the names for you.
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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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This is based heavily on the work done for normalized strings, in `crate::normalize`. The key realization in that module is that the logic distinguishing one kind of thing (normalized strings in that case, IDs, in this case) can be packaged up as a type token, and that doing so may reduce the overall complexity. This implementation for ID also borrows heavily from the implementation for normalized strings.
It's less flexible: an ID implemented this way can't expose _less_ of `crate::id::ID`'s interface, whereas newtype wrappers can, for example. However, our code doesn't use that flexiblity on purpose anywhere and we're relatively unlikely to change that. In return, the individual ID types require substantially less code - they do not, for example, need to re-implement `Display` for themselves.
I very nearly made the trait `Prefix`:
```rust
pub trait Prefix {
const PREFIX: &str;
}
```
however, I think having an effectively-constant method is less surprising overall.
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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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