| 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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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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