finish the main code

app/routers/nodes.py

@@ -0,0 +1,31 @@
+from fastapi import APIRouter
+from app.k8s_client import get_core_client
+
+router = APIRouter(prefix="/nodes", tags=["nodes"])
+
+
+@router.get("/")
+def list_node():
+    v1 = get_core_client()
+    nodes = v1.list_node().items
+    result = []
+    for n in nodes:
+        conditions = {c.type: c.status for c in n.status.conditions}
+        result.append(
+            {
+                "name": n.metadata.name,
+                "ready": conditions.get("Ready") == "True",
+                "cpu_capacity": n.status.capacity.get("cpu"),
+                "memory_capacity": n.status.capacity.get("memory"),
+                "labels": n.metadata.labels,
+                "age_days": _age(n.metadata.creation_timestamp),
+            }
+        )
+    return result
+
+
+def _age(ts) -> int:
+    from datetime import datetime, timezone
+
+    now = datetime.now(timezone.utc)
+    return (now - ts).days