Extract traefik rule parsing to separate method

create-nginx-map.py

@@ -1,6 +1,7 @@
 import requests
 from typing import NamedTuple
 import re
+import sys
 
 TRAEFIK_HOST_RE = re.compile(r"Host\(`([a-z0-9\.-]+)`\)")
 
@@ -10,18 +11,26 @@ class Route(NamedTuple):
     hostname: str
 
 
+def parse_traefik_rule(rule: str) -> list[str]:
+    if "Host(" not in rule:
+        return []
+
+    return TRAEFIK_HOST_RE.findall(rule)
+
+
 def get_traefik_routes(traefik_host: str, traefik_route: str):
     api_response = requests.get(f"{traefik_host}/api/http/routers").json()
     routes = set()
 
     for router in api_response:
-        if "Host(" not in router["rule"]:
-            continue
-
-        hosts = TRAEFIK_HOST_RE.findall(router["rule"])
+        hosts = parse_traefik_rule(router["rule"])
 
         if not hosts:
-            raise ValueError(f"Failed to find host for {router['rule']}")
+            print(f"Failed to find host for {router['rule']}", file=sys.stderr)
+            continue
+
+        if len(hosts) > 1:
+            print(f"WARNING: Found multiple hosts for rule: {router['rule']}", file=sys.stderr)
 
         routes.add(Route(
             router["service"],