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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 intended to manage storage growth. A community with broadly steady traffic will now reach a steady state (ish) where the amount of storage in use stays within a steady band.
The 90 day threshold is a spitball; this should be made configurable for the community's needs.
I've also hoisted expiry out into the `app` classes, to reduce the amount of non-database work repo types are doing. This should make it easier to make expiry configurable later on.
Includes incidental cleanup and style changes.
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This is implemented by making the return values, in most cases, idiosyncratic ad-hoc types that then convert to the approprate error response. This also should make endpoints more testable, since the return values can now be inspected to check their properties without having to process or parse an HTTP response.
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Having them contained in the individual endpoint groups conveyed an unintended sense that their intended scope was _only_ that endpoint group. It also made most repo-related import paths _quite_ long. This splits up the repos as follows:
* "General applicability" repos - those that are only loosely connected to a single task, and are likely to be shared between tasks - go in crate::repo.
* Specialized repos - those tightly connected to a specific task - go in the module for that task, under crate::PATH::repo.
In both cases, each repo goes in its own submodule, to make it easier to use the module name as a namespace.
Which category a repo goes in is a judgment call. `crate::channel::repo::broadcast` (formerly `channel::repo::messages`) is used outside of `crate::channel`, for example, but its main purpose is to support channel message broadcasts. It could arguably live under `crate::event::repo::channel`, but the resulting namespace is less legible to me.
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This bugged me aesthetically. At `app.channel().events(channel)`, the caller knows the channel ID; they don't need to be told. Having the same info come back out in the returned events felt bad.
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While reviewing [MDN], I noticed this note:
> SSE suffers from a limitation to the maximum number of open connections, which can be specially painful when opening various tabs as the limit is per browser and set to a very low number (6). […] This limit is per browser + domain, so that means that you can open 6 SSE connections across all of the tabs to www.example1.com and another 6 SSE connections to www.example2.com.
I tested it in Safari; this is true, and once six streams are open, _no_ more requests can be made - in any tab, even a fresh one.
Since the design _was_ that each channel had its own events endpoint, this is an obvious operations risk. Any client that tries to read multiple channels' streams will hit this limit quickly.
This change consolidates all channel events into a single endpoint: `/events`. This takes a list of channel IDs (as query parameters, one `channel=` param per channel), and streams back events from all listed channels. The previous `/:channel/events` endpoint has been removed. Clients can selectively request events for the channels they're interested in.
[MDN]: https://developer.mozilla.org/en-US/docs/Web/API/EventSource
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