fix: 4155 - Queue up health check on server restarting

[louis-jan]

Describe Your Changes

• This fixes the issue where users force-kill the Cortex process in Windows Task Manager and immediately try to send a message in Jan's UI, they receive a "failed to fetch" error. This indicates that Jan is not gracefully handling cases where the Cortex process is terminated unexpectedly.

Fixes Issues

• bug: Failed to fetch error when killing Cortex process in Task Manager #4155

Changes made

The code modification introduces several updates within the onclose event handler for a WebSocket connection:

1. Comment Addition: A comment explaining the server segfault issue handling has been added.

2. Event Emission: Before attempting to reconnect, the code now emits a ModelEvent.OnModelStopped event to notify the application about a model's stopped state.

3. Health Check: After attempting to reconnect, the code queues up a health check call (this.healthz()) using the this.queue mechanism to ensure the system's health is verified.

[github-actions]

Barecheck - Code coverage report

Total: 69.32%

Your code coverage diff: 0.00% ▴

✅ All code changes are covered