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feat(sync): Add MSC4354 sticky events #2089

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Aranjedeath merged 1 commit from eleboucher/continuwuity:feat/msc4354-sticky-events into main 2026-08-02 17:41:31 +00:00
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eleboucher commented 2026-08-02 08:21:07 +00:00
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This pull request add support for legacy sticky event MSC4354

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eleboucher changed title from feat(sync): Add MSC4354 sticky events to WIP: feat(sync): Add MSC4354 sticky events 2026-08-02 08:38:08 +00:00
eleboucher force-pushed feat/msc4354-sticky-events from 832a38b44b
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eleboucher changed title from WIP: feat(sync): Add MSC4354 sticky events to feat(sync): Add MSC4354 sticky events 2026-08-02 09:15:59 +00:00
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nex reviewed 2026-08-02 13:22:46 +00:00
src/core/config/mod.rs Outdated
@ -1526,6 +1526,12 @@ pub struct Config {
#[serde(default = "true_fn")]
pub allow_incoming_typing: bool,
/// Allow sticky events (MSC4354).
nex commented 2026-08-02 13:22:46 +00:00
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A better description might be

/// Allow the use of unstable persistent "sticky events" ([MSC4354])
/// 
/// MSC4354: https://c10y.cc/MSC4354
A better description might be ```rs /// Allow the use of unstable persistent "sticky events" ([MSC4354]) /// /// MSC4354: https://c10y.cc/MSC4354 ```
eleboucher marked this conversation as resolved
nex reviewed 2026-08-02 13:32:21 +00:00
src/service/sending/sender.rs Outdated
@ -272,0 +272,4 @@
let over_budget =
self.server.config.startup_netburst_keep >= 0 && entry.len() >= keep;
// MSC4354 forbids a backlog costing us a sticky event, so they are
nex commented 2026-08-02 13:32:14 +00:00
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There's a bit of a problem here: startup netburst can be turned off entirely, and it is commonly recommended to do so in order to resolve network overload on startup. Since netburst doesn't have any delivery guarantees, does this explicitly conflict with the MSC? (if it does, we might have to conjure up a secondary netburst mechanism that only pushes sticky events, although I'd prefer to avoid that complexity)

There's a bit of a problem here: startup netburst can be turned *off* entirely, and it is commonly recommended to do so in order to resolve network overload on startup. Since netburst doesn't have any delivery guarantees, does this explicitly conflict with the MSC? (if it does, we might have to conjure up a secondary netburst mechanism that only pushes sticky events, although I'd prefer to avoid that complexity)
eleboucher commented 2026-08-02 15:26:16 +00:00
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Good catch.

It does conflict with the MSC, but startup_netburst = false already drops the whole queue for every event type, so I didn't think sticky events should override that.

Good catch. It does conflict with the MSC, but startup_netburst = false already drops the whole queue for every event type, so I didn't think sticky events should override that.
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nex approved these changes 2026-08-02 16:04:52 +00:00
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nex added this to the 26.8.0 milestone 2026-08-20 01:01:49 +00:00
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