Fix dry-mode API failures and fast SIGTERM shutdown

src/main.py

@@ -115,7 +115,18 @@ def main() -> None:
     web = WebPortal(state=state, network_manager=nm, broadcaster=broadcaster)
 
     try:
-        web.run(host="0.0.0.0", port=80)
+        web_thread = threading.Thread(
+            target=web.run,
+            kwargs={"host": "0.0.0.0", "port": 80},
+            daemon=True,
+            name="web-portal",
+        )
+        web_thread.start()
+
+        while not stop_event.wait(1):
+            if not web_thread.is_alive():
+                LOG.error("Web server thread exited unexpectedly")
+                break
     finally:
         bridge.stop()
         supervisor.stop()

src/network_manager.py

@@ -173,6 +173,7 @@ class NetworkManager:
         return sorted_items
 
     def _scan_with_wpa_cli(self) -> List[str]:
+        try:
             cmd_scan = ["wpa_cli", "-i", self.interface, "scan"]
             proc = self._run(cmd_scan, timeout=15)
             if proc.returncode != 0 or "OK" not in proc.stdout:
@@ -185,6 +186,8 @@ class NetworkManager:
                     parsed = self._parse_scan_results(proc_results.stdout)
                     if parsed:
                         return [ssid for ssid, _signal in parsed]
+        except Exception:
+            return []
         return []
 
     def _scan_with_iw(self) -> List[str]:
@@ -208,9 +211,12 @@ class NetworkManager:
         return ssids
 
     def scan_networks(self) -> List[str]:
+        try:
             ssids = self._scan_with_wpa_cli()
             if not ssids:
                 ssids = self._scan_with_iw()
+        except Exception:
+            ssids = []
 
         if ssids:
             self.state.set_known_ssids(ssids)

src/webapp.py

@@ -36,13 +36,21 @@ class WebPortal:
 
         @self.app.route("/api/status", methods=["GET"])
         def status() -> Response:
+            try:
                 self.network_manager.refresh_state()
                 return jsonify(self.state.snapshot())
+            except Exception as exc:
+                self.state.update_status("Status update failed", str(exc))
+                return jsonify(self.state.snapshot()), 503
 
         @self.app.route("/api/scan", methods=["POST", "GET"])
         def scan() -> Response:
+            try:
                 ssids = self.network_manager.scan_networks()
                 return jsonify({"ok": True, "ssids": ssids})
+            except Exception as exc:
+                self.state.update_status("Scan failed", str(exc))
+                return jsonify({"ok": False, "ssids": [], "message": str(exc)}), 503
 
         @self.app.route("/api/connect", methods=["POST"])
         def connect() -> Response: