Implement automated Fleet Hub upstream client package caching and background update distribution

src/hub/Server.py

@@ -2205,6 +2205,22 @@ def health_check():
     }
 
 
+async def update_checker_loop(interval_hours: int = 1):
+    """
+    Background worker that periodically queries the upstream repository
+    and automatically downloads/caches client binary update packages locally on the Hub.
+    """
+    # Brief initial pause after socket startup
+    await asyncio.sleep(5)
+    while True:
+        try:
+            mgr: ServerUpdateManager = SERVER_STATE.get("update_manager") or UPDATE_MANAGER
+            mgr.check_upstream_updates(force=False, auto_download_clients=True)
+        except Exception as e:
+            print(f"[!] Warning in update checker background loop: {e}")
+        await asyncio.sleep(interval_hours * 3600)
+
+
 async def run_server():
     """Runs the mTLS TCP socket listener and the Hermes REST API concurrently."""
     config = SERVER_STATE["config"]
@@ -2226,6 +2242,7 @@ async def run_server():
     watchdog_task = asyncio.create_task(cert_validity_watchdog())
     collector_task = asyncio.create_task(local_collector_loop(interval_seconds=30))
     buffer_task = asyncio.create_task(ingest_buffer_worker_loop())
+    update_task = asyncio.create_task(update_checker_loop(interval_hours=1))
 
     try:
         await asyncio.gather(
@@ -2233,13 +2250,15 @@ async def run_server():
             uv_server.serve(),
             watchdog_task,
             collector_task,
-            buffer_task
+            buffer_task,
+            update_task
         )
     finally:
         watchdog_task.cancel()
         collector_task.cancel()
         buffer_task.cancel()
-        for t in [watchdog_task, collector_task, buffer_task]:
+        update_task.cancel()
+        for t in [watchdog_task, collector_task, buffer_task, update_task]:
             try:
                 await t
             except asyncio.CancelledError: