codeant-ai-for-open-source[bot] commented on PR #38308:
URL: https://github.com/apache/superset/pull/38308#issuecomment-4029918428
## **Sequence Diagram**
This PR migrates websocket tests from Jest to Vitest and tightens assertions
around how the server validates JWTs, registers client sockets, and optionally
replays events from Redis on reconnect. The diagram summarizes that core
connection and replay flow which the updated tests exercise.
```mermaid
sequenceDiagram
participant Client
participant HTTPServer
participant WebSocketServer
participant Redis
Client->>HTTPServer: HTTP upgrade request with JWT and optional last id
HTTPServer->>HTTPServer: Validate JWT and extract channel id
alt Invalid or missing channel in JWT
HTTPServer-->>Client: Close socket (no upgrade)
else Valid JWT with channel
HTTPServer->>WebSocketServer: Upgrade to WebSocket
WebSocketServer->>WebSocketServer: Register socket for channel
opt last id present
WebSocketServer->>Redis: Read events from channel stream range
Redis-->>WebSocketServer: Stream results
WebSocketServer-->>Client: Send replayed events over WebSocket
end
end
```
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