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//! Server-Sent Events for real-time agent updates
//!
//! Uses `TmaiCore::subscribe()` for push-based notifications and falls back
//! to polling the latest state when the receiver lags.
use axum::{
extract::State,
response::{
sse::{Event, Sse},
IntoResponse,
},
};
use std::convert::Infallible;
use std::sync::Arc;
use std::time::Duration;
use tokio::sync::broadcast::error::RecvError;
use tmai_core::api::{CoreEvent, TmaiCore};
use super::api::{build_team_info, TeamInfoResponse};
/// Build agents JSON from TmaiCore snapshots
fn build_agents_json(core: &TmaiCore) -> String {
let agents = core.list_agents();
serde_json::to_string(&agents).unwrap_or_else(|_| "[]".to_string())
}
/// Build agents JSON for change-detection comparison (excludes volatile fields like last_update)
fn build_agents_fingerprint(core: &TmaiCore) -> String {
let agents = core.list_agents();
let stripped: Vec<serde_json::Value> = agents
.iter()
.filter_map(|a| {
let mut v = serde_json::to_value(a).ok()?;
if let Some(obj) = v.as_object_mut() {
obj.remove("last_update");
}
Some(v)
})
.collect();
serde_json::to_string(&stripped).unwrap_or_default()
}
/// Build teams JSON from TmaiCore raw state
#[allow(deprecated)]
fn build_teams_json(core: &TmaiCore) -> String {
let app_state = core.raw_state().read();
let teams: Vec<TeamInfoResponse> = app_state
.teams
.values()
.map(|snapshot| build_team_info(snapshot, &app_state))
.collect();
serde_json::to_string(&teams).unwrap_or_else(|_| "[]".to_string())
}
/// SSE stream for agent and team updates
///
/// Uses `core.subscribe()` to receive push notifications from the core event
/// system. Falls back to full state re-send on lag. Maintains a keep-alive
/// every 15 seconds.
pub async fn events(State(core): State<Arc<TmaiCore>>) -> impl IntoResponse {
let (tx, rx) = tokio::sync::mpsc::channel::<Result<Event, Infallible>>(16);
tokio::spawn(async move {
let mut event_rx = core.subscribe();
let mut last_agents_fingerprint = String::new();
let mut last_teams_json = String::new();
// Send initial state immediately
let agents_json = build_agents_json(&core);
let agents_fingerprint = build_agents_fingerprint(&core);
let teams_json = build_teams_json(&core);
if !agents_json.is_empty() && agents_json != "[]" {
let event = Event::default().event("agents").data(&agents_json);
if tx.send(Ok(event)).await.is_err() {
return;
}
last_agents_fingerprint = agents_fingerprint;
}
if !teams_json.is_empty() && teams_json != "[]" {
let event = Event::default().event("teams").data(&teams_json);
if tx.send(Ok(event)).await.is_err() {
return;
}
last_teams_json = teams_json;
}
// Fallback interval for when no events arrive (e.g. teams not yet emitting events)
let mut fallback_interval = tokio::time::interval(Duration::from_millis(500));
// Skip the first tick (already sent initial state)
fallback_interval.tick().await;
loop {
tokio::select! {
result = event_rx.recv() => {
match result {
Ok(CoreEvent::AgentsUpdated) | Ok(CoreEvent::AgentStatusChanged { .. })
| Ok(CoreEvent::AgentAppeared { .. }) | Ok(CoreEvent::AgentDisappeared { .. }) => {
let fingerprint = build_agents_fingerprint(&core);
if fingerprint != last_agents_fingerprint {
let agents_json = build_agents_json(&core);
let event = Event::default().event("agents").data(&agents_json);
if tx.send(Ok(event)).await.is_err() {
return;
}
last_agents_fingerprint = fingerprint;
}
}
Ok(CoreEvent::TeamsUpdated) => {
let teams_json = build_teams_json(&core);
if teams_json != last_teams_json {
let event = Event::default().event("teams").data(&teams_json);
if tx.send(Ok(event)).await.is_err() {
return;
}
last_teams_json = teams_json;
}
}
Ok(CoreEvent::TeammateIdle { team_name, member_name, .. }) => {
let data = serde_json::json!({
"team_name": team_name,
"member_name": member_name,
});
let event = Event::default()
.event("teammate_idle")
.data(data.to_string());
if tx.send(Ok(event)).await.is_err() {
return;
}
}
Ok(CoreEvent::TaskCompleted { team_name, task_id, task_subject }) => {
let data = serde_json::json!({
"team_name": team_name,
"task_id": task_id,
"task_subject": task_subject,
});
let event = Event::default()
.event("task_completed")
.data(data.to_string());
if tx.send(Ok(event)).await.is_err() {
return;
}
}
Ok(CoreEvent::ContextCompacting { target, compaction_count }) => {
let data = serde_json::json!({
"target": target,
"compaction_count": compaction_count,
});
let event = Event::default()
.event("context_compacting")
.data(data.to_string());
if tx.send(Ok(event)).await.is_err() {
return;
}
}
Ok(CoreEvent::UsageUpdated) => {
let usage = core.get_usage();
if let Ok(data) = serde_json::to_string(&usage) {
let event = Event::default().event("usage").data(data);
if tx.send(Ok(event)).await.is_err() {
return;
}
}
}
Ok(CoreEvent::WorktreeCreated { target, worktree }) => {
let data = serde_json::json!({
"target": target,
"worktree": worktree,
});
let event = Event::default()
.event("worktree_created")
.data(data.to_string());
if tx.send(Ok(event)).await.is_err() {
return;
}
}
Ok(CoreEvent::WorktreeRemoved { target, worktree }) => {
let data = serde_json::json!({
"target": target,
"worktree": worktree,
});
let event = Event::default()
.event("worktree_removed")
.data(data.to_string());
if tx.send(Ok(event)).await.is_err() {
return;
}
}
Ok(CoreEvent::ConfigChanged { .. })
| Ok(CoreEvent::AgentStopped { .. })
| Ok(CoreEvent::InstructionsLoaded { .. })
| Ok(CoreEvent::ReviewReady { .. })
| Ok(CoreEvent::WorktreeSetupCompleted { .. })
| Ok(CoreEvent::WorktreeSetupFailed { .. }) => {
// Future: forward to SSE subscribers if needed
}
Ok(CoreEvent::ReviewLaunched { source_target, review_target }) => {
let data = serde_json::json!({
"source_target": source_target,
"review_target": review_target,
});
let event = Event::default()
.event("review_launched")
.data(data.to_string());
if tx.send(Ok(event)).await.is_err() {
return;
}
}
Ok(CoreEvent::ReviewCompleted { source_target, summary }) => {
let data = serde_json::json!({
"source_target": source_target,
"summary": summary,
});
let event = Event::default()
.event("review_completed")
.data(data.to_string());
if tx.send(Ok(event)).await.is_err() {
return;
}
}
Err(RecvError::Lagged(skipped)) => {
tracing::debug!(skipped, "SSE subscriber lagged, re-sending full state");
// Re-send full state on lag
let fingerprint = build_agents_fingerprint(&core);
if fingerprint != last_agents_fingerprint {
let agents_json = build_agents_json(&core);
let event = Event::default().event("agents").data(&agents_json);
if tx.send(Ok(event)).await.is_err() {
return;
}
last_agents_fingerprint = fingerprint;
}
let teams_json = build_teams_json(&core);
if teams_json != last_teams_json {
let event = Event::default().event("teams").data(&teams_json);
if tx.send(Ok(event)).await.is_err() {
return;
}
last_teams_json = teams_json;
}
}
Err(RecvError::Closed) => {
return;
}
}
}
_ = fallback_interval.tick() => {
// Fallback polling for data not yet covered by events (e.g. teams)
let teams_json = build_teams_json(&core);
if teams_json != last_teams_json {
let event = Event::default().event("teams").data(&teams_json);
if tx.send(Ok(event)).await.is_err() {
return;
}
last_teams_json = teams_json;
}
}
}
}
});
let stream = tokio_stream::wrappers::ReceiverStream::new(rx);
Sse::new(stream).keep_alive(
axum::response::sse::KeepAlive::new()
.interval(Duration::from_secs(15))
.text("keep-alive"),
)
}