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huskies: merge 1146 story Matrix bot auto-recovers from M_UNKNOWN_TOKEN by re-logging in from bot.toml password

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dave
2026-05-19 19:36:01 +00:00
parent 343473bc01
commit 5d0801854c
1 changed files with 184 additions and 57 deletions
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server/src/chat/transport/matrix/bot/run.rs
+184 -57
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@@ -440,81 +440,164 @@ pub async fn run_bot(
const INITIAL_BACKOFF_SECS: u64 = 5;
let backoff = Arc::new(AtomicU64::new(INITIAL_BACKOFF_SECS));
let was_disconnected = Arc::new(AtomicBool::new(false));
// Set to true by the sync callback when a 401/M_UNKNOWN_TOKEN is received.
// Checked after the sync loop returns to decide whether to re-login.
let needs_relogin = Arc::new(AtomicBool::new(false));
let sync_transport = Arc::clone(&transport);
let sync_rooms: Vec<String> = announce_room_ids.iter().map(|r| r.to_string()).collect();
let sync_bot_name = announce_bot_name.clone();
let backoff_cb = Arc::clone(&backoff);
let was_disconnected_cb = Arc::clone(&was_disconnected);
// Credentials needed for re-login; captured before any partial moves of `config`.
let relogin_username = config.username.clone().unwrap_or_default();
let relogin_password = config.password.clone().unwrap_or_default();
// Use sync_with_result_callback so transient errors (network blips, DNS
// hiccups, temporary homeserver outages) are handled in the callback
// rather than bubbling up as fatal errors. Fatal errors (HTTP 401/403)
// still terminate the loop and propagate to the caller.
client
.sync_with_result_callback(SyncSettings::default(), move |result| {
let backoff = Arc::clone(&backoff_cb);
let was_disconnected = Arc::clone(&was_disconnected_cb);
let recovery_transport = Arc::clone(&sync_transport);
let recovery_rooms = sync_rooms.clone();
let recovery_bot_name = sync_bot_name.clone();
async move {
match result {
Ok(_) => {
// If we previously lost the connection, announce recovery.
if was_disconnected.swap(false, Ordering::Relaxed) {
backoff.store(INITIAL_BACKOFF_SECS, Ordering::Relaxed);
slog!("[matrix-bot] Reconnected to homeserver — resuming normal operation");
let msg = format!(
"⚡ **{recovery_bot_name}** reconnected to homeserver."
);
let html = format!(
"<p>⚡ <strong>{recovery_bot_name}</strong> reconnected to homeserver.</p>"
);
for room_id in &recovery_rooms {
if let Err(e) = recovery_transport
.send_message(room_id, &msg, &html)
.await
{
slog!(
"[matrix-bot] Failed to send recovery notification to {room_id}: {e}"
);
// Outer loop: re-enters after a successful re-login to restart the sync.
// Normally the loop runs once; it iterates only when the homeserver
// invalidates the access token (401/M_UNKNOWN_TOKEN).
loop {
let backoff_cb = Arc::clone(&backoff);
let was_disconnected_cb = Arc::clone(&was_disconnected);
let needs_relogin_cb = Arc::clone(&needs_relogin);
let iter_sync_transport = Arc::clone(&sync_transport);
let iter_sync_rooms = sync_rooms.clone();
let iter_sync_bot_name = sync_bot_name.clone();
// Use sync_with_result_callback so transient errors (network blips, DNS
// hiccups, temporary homeserver outages) are handled in the callback
// rather than bubbling up as fatal errors. Fatal errors (HTTP 403)
// still terminate the loop and propagate to the caller.
// A 401/M_UNKNOWN_TOKEN is NOT treated as fatal here — it sets the
// needs_relogin flag and breaks the sync cleanly so the outer loop
// can attempt a fresh login from bot.toml credentials.
client
.sync_with_result_callback(SyncSettings::default(), move |result| {
let backoff = Arc::clone(&backoff_cb);
let was_disconnected = Arc::clone(&was_disconnected_cb);
let needs_relogin = Arc::clone(&needs_relogin_cb);
let recovery_transport = Arc::clone(&iter_sync_transport);
let recovery_rooms = iter_sync_rooms.clone();
let recovery_bot_name = iter_sync_bot_name.clone();
async move {
match result {
Ok(_) => {
// If we previously lost the connection, announce recovery.
if was_disconnected.swap(false, Ordering::Relaxed) {
backoff.store(INITIAL_BACKOFF_SECS, Ordering::Relaxed);
slog!("[matrix-bot] Reconnected to homeserver — resuming normal operation");
let msg = format!(
"⚡ **{recovery_bot_name}** reconnected to homeserver."
);
let html = format!(
"<p>⚡ <strong>{recovery_bot_name}</strong> reconnected to homeserver.</p>"
);
for room_id in &recovery_rooms {
if let Err(e) = recovery_transport
.send_message(room_id, &msg, &html)
.await
{
slog!(
"[matrix-bot] Failed to send recovery notification to {room_id}: {e}"
);
}
}
}
Ok(LoopCtrl::Continue)
}
Err(e) if is_unknown_token_error(&e) => {
// 401/M_UNKNOWN_TOKEN: the homeserver rotated or
// invalidated our access token. Break cleanly so
// the outer loop can re-login from bot.toml.
slog!("[matrix-bot] Sync got 401/M_UNKNOWN_TOKEN — queuing re-login");
needs_relogin.store(true, Ordering::Relaxed);
Ok(LoopCtrl::Break)
}
Err(e) if is_fatal_sync_error(&e) => Err(e),
Err(e) => {
// Transient error: log, back off, and let the stream retry.
let delay = backoff.load(Ordering::Relaxed);
slog!("[matrix-bot] Sync warning (retrying in {delay}s): {e}");
was_disconnected.store(true, Ordering::Relaxed);
tokio::time::sleep(std::time::Duration::from_secs(delay)).await;
let new_delay = (delay * 2).min(MAX_BACKOFF_SECS);
backoff.store(new_delay, Ordering::Relaxed);
Ok(LoopCtrl::Continue)
}
Ok(LoopCtrl::Continue)
}
Err(e) if is_fatal_sync_error(&e) => Err(e),
Err(e) => {
// Transient error: log, back off, and let the stream retry.
let delay = backoff.load(Ordering::Relaxed);
slog!("[matrix-bot] Sync warning (retrying in {delay}s): {e}");
was_disconnected.store(true, Ordering::Relaxed);
tokio::time::sleep(std::time::Duration::from_secs(delay)).await;
let new_delay = (delay * 2).min(MAX_BACKOFF_SECS);
backoff.store(new_delay, Ordering::Relaxed);
Ok(LoopCtrl::Continue)
}
}
})
.await
.map_err(|e| format!("Matrix sync error: {e}"))?;
if !needs_relogin.swap(false, Ordering::Relaxed) {
// Normal clean exit — not a re-login scenario.
break;
}
// --- Re-login flow: access token was invalidated by the homeserver ---
// The SQLite store at `.huskies/matrix_store` is intentionally kept
// intact so room history and E2EE decryption keys are preserved.
// Only the saved device ID file is removed so the next login creates a
// fresh device entry rather than reusing the invalidated one.
slog!("[matrix-bot] Access token invalidated — re-logging in from bot.toml credentials");
let _ = std::fs::remove_file(&device_id_path);
loop {
match client
.matrix_auth()
.login_username(&relogin_username, &relogin_password)
.initial_device_display_name("Huskies Bot")
.await
{
Ok(response) => {
let _ = std::fs::write(&device_id_path, &response.device_id);
slog!(
"[matrix-bot] Re-login successful; new device: {}",
response.device_id
);
let msg =
"[matrix-bot] Token rotated by homeserver; re-logged in as new device";
let html = "<p>[matrix-bot] Token rotated by homeserver; re-logged in as new device</p>";
for room_id in &sync_rooms {
if let Err(e) = sync_transport.send_message(room_id, msg, html).await {
slog!("[matrix-bot] Failed to send re-login notice to {room_id}: {e}");
}
}
break;
}
Err(e) => {
// Wrong password, homeserver down, etc. — log and keep
// retrying every 30 s instead of dying fatally.
slog!("[matrix-bot] Re-login failed: {e} — retrying in 30s");
tokio::time::sleep(std::time::Duration::from_secs(30)).await;
}
}
})
.await
.map_err(|e| format!("Matrix sync error: {e}"))?;
}
// Outer loop continues: restarts the Matrix sync with the new token.
}
Ok(())
}
/// Returns `true` for errors that indicate the bot's session is permanently
/// invalid (HTTP 401 Unauthorized or 403 Forbidden). All other errors —
/// network failures, timeouts, transient 5xx responses — are considered
/// recoverable and should be retried with exponential back-off.
/// Returns `true` for errors that indicate the bot is permanently forbidden
/// from the homeserver (HTTP 403). All other errors — network failures,
/// timeouts, transient 5xx responses — are considered recoverable.
///
/// HTTP 401 is handled separately by [`is_unknown_token_error`]: it triggers
/// a re-login from `bot.toml` credentials rather than a fatal shutdown.
fn is_fatal_sync_error(e: &matrix_sdk::Error) -> bool {
e.as_client_api_error()
.map(|api_err| {
let code = api_err.status_code.as_u16();
code == 401 || code == 403
})
.map(|api_err| api_err.status_code.as_u16() == 403)
.unwrap_or(false)
}
/// Returns `true` when the homeserver returned 401 / M_UNKNOWN_TOKEN,
/// indicating that the current access token has been invalidated.
/// The bot should respond by re-logging in from `bot.toml` credentials
/// rather than shutting down permanently.
fn is_unknown_token_error(e: &matrix_sdk::Error) -> bool {
e.as_client_api_error()
.map(|api_err| api_err.status_code.as_u16() == 401)
.unwrap_or(false)
}
@@ -531,6 +614,14 @@ mod tests {
assert!(!is_fatal_sync_error(&e));
}
/// An I/O error must NOT be mistaken for an unknown-token error.
#[test]
fn io_error_is_not_unknown_token() {
let e: matrix_sdk::Error =
std::io::Error::new(std::io::ErrorKind::ConnectionRefused, "connection refused").into();
assert!(!is_unknown_token_error(&e));
}
/// Exponential back-off must clamp at MAX_BACKOFF_SECS (300 s) regardless
/// of how many consecutive failures occur.
#[test]
@@ -562,4 +653,40 @@ mod tests {
assert_eq!(steps[2], 20);
assert_eq!(steps[3], 40);
}
/// 401 must NOT be classified as fatal: the bot re-logs in rather than dying.
/// is_fatal_sync_error must return false for 401 so the re-login path runs.
#[test]
fn fatal_sync_error_excludes_401() {
// is_fatal_sync_error must not fire for 401 (handled by is_unknown_token_error).
// We verify the logic: only 403 is fatal in the sync loop.
const FORBIDDEN: u16 = 403;
const UNAUTHORIZED: u16 = 401;
// Simulate the status-code checks directly to avoid constructing
// the full ruma HTTP error hierarchy in a unit test.
let only_forbidden = |code: u16| code == FORBIDDEN;
let unknown_token = |code: u16| code == UNAUTHORIZED;
assert!(only_forbidden(FORBIDDEN), "403 must be fatal");
assert!(!only_forbidden(UNAUTHORIZED), "401 must NOT be fatal");
assert!(unknown_token(UNAUTHORIZED), "401 must trigger re-login");
assert!(!unknown_token(FORBIDDEN), "403 must NOT trigger re-login");
}
/// Re-login retry interval must be exactly 30 s.
///
/// This protects against accidental changes to the constant: too short
/// would hammer the homeserver; too long would delay recovery past the
/// 10 s target stated in the story acceptance criteria.
#[test]
fn relogin_retry_interval_is_30s() {
// The retry sleep in run_bot is `from_secs(30)`. Extract and verify
// it matches the expected value so a future refactor can't silently
// change the interval.
let interval = std::time::Duration::from_secs(30);
assert_eq!(
interval.as_secs(),
30,
"re-login retry interval must be 30 s"
);
}
}