Replace chp with traefik-proxy

tljh/systemd.py

@@ -70,3 +70,48 @@ def enable_service(name):
         'enable',
         name
     ], check=True)
+
+
+def check_service_active(name):
+    """
+    Check if a service is currently active (running)
+    """
+    try:
+        subprocess.run([
+            'systemctl',
+            'is-active',
+            name
+        ], check=True)
+        return True
+    except subprocess.CalledProcessError:
+        return False
+
+
+def check_hub_ready():
+    """
+    Check if the hub is ready
+    """
+
+    try:
+        last_restart = subprocess.check_output([
+            'systemctl',
+            'show',
+            'jupyterhub',
+            '-p',
+            'ActiveEnterTimestamp'
+            ]).decode().strip()
+
+        last_restart = " ".join(last_restart.split(" ")[-3:-1])
+
+        out = subprocess.check_output([
+            'journalctl',
+            '-u',
+            'jupyterhub',
+            '--since',
+            last_restart
+        ])
+
+        if "JupyterHub is now running at" in out.decode():
+            return True
+    except subprocess.CalledProcessError:
+        return False