1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
use std::sync::Arc;
/// Session and query lifecycle notification.
///
/// `SessionCreated` / `SessionDestroyed` are emitted by the server-side
/// session manager, while `QueryStarted` / `QueryCompleted` /
/// `SlowQueryDetected` are emitted by `QueryManager`. A single enum is used
/// so observers can subscribe once and receive both halves.
/// The event reference is valid only for the dispatch call; observers must
/// not retain it beyond the callback.
#[derive(Debug, Clone)]
pub enum SessionEvent {
SessionCreated {
session_id: i64,
user_name: String,
},
SessionDestroyed {
session_id: i64,
},
QueryStarted {
session_id: i64,
query_id: i64,
query_text: String,
},
QueryCompleted {
session_id: i64,
query_id: i64,
duration_ms: i64,
success: bool,
},
SlowQueryDetected {
session_id: i64,
query_id: i64,
duration_ms: i64,
threshold_ms: i64,
},
}
/// Runtime observer for session/query events.
pub type SessionEventCallback = Arc<dyn Fn(&SessionEvent) + Send + Sync>;