clan_lib: implement check_zerotier_running for network overview

pkgs/clan-cli/clan_lib/network/zerotier/__init__.py

@@ -6,6 +6,7 @@ from dataclasses import dataclass
 
 from clan_lib.errors import ClanError
 from clan_lib.network import Network, NetworkTechnologyBase, Peer
+from clan_lib.network.zerotier.lib import check_zerotier_running
 from clan_lib.ssh.remote import Remote
 
 log = logging.getLogger(__name__)
@@ -14,7 +15,7 @@ log = logging.getLogger(__name__)
 @dataclass(frozen=True)
 class NetworkTechnology(NetworkTechnologyBase):
     def is_running(self) -> bool:
-        return True
+        return check_zerotier_running()
 
     def ping(self, remote: Remote) -> None | float:
         if self.is_running():
@@ -32,6 +33,7 @@ class NetworkTechnology(NetworkTechnologyBase):
 
     @contextmanager
     def connection(self, network: Network) -> Iterator[Network]:
+        # TODO: Implement userspace ZeroTier service start/stop
         yield network
 
     def remote(self, peer: Peer) -> "Remote":

pkgs/clan-cli/clan_lib/network/zerotier/lib.py

@@ -0,0 +1,27 @@
+import contextlib
+import json
+import urllib.request
+from typing import TypedDict
+
+
+class ZeroTierConfig(TypedDict):
+    clock: int
+    online: bool
+    version: str
+    versionBuild: int
+    versionMajor: int
+    versionMinor: int
+    versionRev: int
+
+
+def get_zerotier_health() -> ZeroTierConfig:
+    # Placeholder for actual ZeroTier running check
+    res = urllib.request.urlopen("http://localhost:9993/health")
+    return json.load(res)
+
+
+def check_zerotier_running() -> bool:
+    with contextlib.suppress(urllib.error.URLError):
+        get_zerotier_health()
+        return True
+    return False