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swarm-controller: end a dead replay, clamp stale resume ids, test on a real server

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A replay consumer now has a 5s idle heartbeat, and the row stream ends at
the first consumer error instead of skipping it. When the server drops the
consumer, as on a restart, two missed heartbeats end the SSE response and
the browser reconnects with Last-Event-ID. Before, the response stayed
open and delivered nothing.

A Last-Event-ID above the stream's newest sequence now replays as a fresh
reader. The server accepts a start past the end and delivers nothing
until the stream reaches it, so a stale id stalled the replay.

swarm-controller's stream tests run against a real nats-server on
loopback (`test_nats`, binary from HIVE_NATS_SERVER, exported by
checks.nix and devshell.nix). They cover: ensuring the stream twice, an
existing stream with other limits being opened as it is, the replay
arriving before live rows, a reconnect getting every later row exactly
once, and a dropped consumer ending the row stream.

The limits test now compares against the subagent stream's own config.
Two comments that described the agent's terminal route as live-only are
corrected.
This commit is contained in:
atlas 2026-10-11 23:25:27 +02:00
commit f08a9cadb6
10 changed files with 357 additions and 40 deletions
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5
swarm-controller/src/main.rs
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@ -64,6 +64,8 @@ mod status;
mod store;
mod subagent_term;
mod term_stream;
#[cfg(test)]
mod test_nats;
mod vcs_metrics;
mod wanted;
mod webhook;
@ -2631,7 +2633,8 @@ fn spawn_subagent_streams(status: Option<&Arc<status::StatusReader>>, hives: &[H
subagent_term::spawn(status.queue_client(), wanted, hives);
}
/// The per-agent background passes: terminal streams and schedule keys.
/// The per-agent background passes: subagent and terminal streams, and
/// schedule keys.
/// Lifted out of `main` for `clippy::too_many_lines`.
fn spawn_per_agent_upkeep(status: Option<&Arc<status::StatusReader>>, hives: &[HiveEntry]) {
spawn_subagent_streams(status, hives);