feat: Add new status page

hnsdoh_status/scheduler.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+
+from apscheduler.schedulers.background import BackgroundScheduler
+
+from hnsdoh_status.checks import run_full_check
+from hnsdoh_status.config import Settings
+from hnsdoh_status.store import StatusStore
+
+
+def create_scheduler(settings: Settings, store: StatusStore) -> BackgroundScheduler:
+    scheduler = BackgroundScheduler(daemon=True)
+
+    def run_checks() -> None:
+        snapshot = run_full_check(
+            domain=settings.domain,
+            doh_path=settings.doh_path,
+            dns_timeout=settings.dns_timeout_seconds,
+            doh_timeout=settings.doh_timeout_seconds,
+            dot_timeout=settings.dot_timeout_seconds,
+        )
+        store.update(snapshot)
+
+    # Run once on startup so the UI/API is populated immediately.
+    run_checks()
+
+    scheduler.add_job(
+        run_checks,
+        "interval",
+        seconds=settings.check_interval_seconds,
+        id="node-health-check",
+        max_instances=1,
+        coalesce=True,
+    )
+    return scheduler