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control_plane_agent: detach stale faux-mgs clients on new attach requests #1925

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control_plane_agent: detach stale faux-mgs clients on new attach requests #1925

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38 changes: 22 additions & 16 deletions task/control-plane-agent/src/mgs_compute_sled.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -259,6 +259,25 @@ impl MgsHandler {
id
}

fn get_attached_nonidle_client(
&mut self,
) -> &Option<AttachedSerialConsoleMgs> {
if let Some(attached) = &self.attached_serial_console_mgs {
// Check whether we think this client has disappeared
let client_age_ms = sys_get_timer()
.now
.saturating_sub(attached.last_keepalive_received);
if Duration::from_millis(client_age_ms)
> SERIAL_CONSOLE_IDLE_TIMEOUT
{
self.usart.clear_rx_data();
self.attached_serial_console_mgs = None;
}
}

return &self.attached_serial_console_mgs;
}

pub(crate) fn packet_to_mgs(
&mut self,
tx_buf: &mut [u8; gateway_messages::MAX_SERIALIZED_SIZE],
Expand All @@ -279,21 +298,8 @@ impl MgsHandler {
}

// Do we have an attached MGS instance that hasn't gone stale?
let sender = match &self.attached_serial_console_mgs {
Some(attached) => {
// Check whether we think this client has disappeared
let client_age_ms = sys_get_timer()
.now
.saturating_sub(attached.last_keepalive_received);
if Duration::from_millis(client_age_ms)
> SERIAL_CONSOLE_IDLE_TIMEOUT
{
self.usart.clear_rx_data();
self.attached_serial_console_mgs = None;
return None;
}
attached.sender
}
let sender = match &self.get_attached_nonidle_client() {
Some(attached) => attached.sender,
None => {
// Discard any buffered data and reset any usart-related timers.
self.usart.clear_rx_data();
Expand Down Expand Up @@ -746,7 +752,7 @@ impl SpHandler for MgsHandler {
return Err(SpError::RequestUnsupportedForComponent);
}

if self.attached_serial_console_mgs.is_some() {
if self.get_attached_nonidle_client().is_some() {
return Err(SpError::SerialConsoleAlreadyAttached);
}

Expand Down