Preserve cold NAT trials in the real network fixture

tests/stream_netns/nat_scenario.py

@@ -14,6 +14,9 @@ def check_profiles(scenario):
     public = [node for node in NODES if not node.nat]
     transport = "tcp" if scenario.args.tcp_only else "udp"
     connected = set()
+    # Первый профиль измеряется при появлении маршрутов, до фонового обхода всех NODEINFO.
+    for agent in agents.values():
+        agent.rpc("nat_auto", enabled=1)
 
     def connect(source, target):
         pair = (source.name, target.name)
@@ -56,13 +59,13 @@ def check_profiles(scenario):
         actual = profile(data[first.name], "udp")
         if actual["helper"] != agents[private_helper.name].identity or agents[private_helper.name].identity in data[first.name]["direct_up"]:
             raise RuntimeError(f"NAT indirect private helper was not used: {actual}")
-        agents[first.name].rpc("nat_auto", enabled=0)
         print(f"NAT routed private helper: {private_helper.name} through {second.name}, group={actual['group']}", flush=True)
 
     verified = {}
     for owner in public + [node for node in NODES if node.nat]:
         observer = second if owner.name == first.name else first
-        agents[owner.name].rpc("nat_auto", enabled=1)
+        if not scenario.args.tcp_only:
+            agents[owner.name].rpc("nat_check", socket="udp", observer=agents[observer.name].identity)
         if not scenario.args.tcp_only:
             contacts = set(profile(agents[owner.name].rpc("stats"), "udp")["contacts"])
             helper = next((node for node in public if node.name not in {owner.name, observer.name} and node.ip not in contacts), None)
@@ -104,7 +107,6 @@ def check_profiles(scenario):
             print(f"NAT {owner.name}/{protocol}: {actual['mapping']} / {actual['inbound']}"
                   f" external={actual['external'] or '-'} reason={actual['reason']}", flush=True)
         verified[owner.name] = observed
-        agents[owner.name].rpc("nat_auto", enabled=0)
         (scenario.network.directory / "nat-profiles.json").write_text(json.dumps(verified, indent=2) + "\n")
 
     # Повтор на использовавшемся порту сохраняет mapping, но не обновляет OPEN