Refactor(eos_designs): Refactor structured_config code for `underlay/…

…as.py` (aristanetworks#4978)

python-avd/pyavd/_eos_designs/structured_config/underlay/as_path.py

@@ -3,9 +3,11 @@
 # that can be found in the LICENSE file.
 from __future__ import annotations
 
-from functools import cached_property
 from typing import TYPE_CHECKING, Protocol
 
+from pyavd._eos_cli_config_gen.schema import EosCliConfigGen
+from pyavd._eos_designs.structured_config.structured_config_generator import structured_config_contributor
+
 if TYPE_CHECKING:
     from . import AvdStructuredConfigUnderlayProtocol
 
@@ -17,27 +19,13 @@ class AsPathMixin(Protocol):
     Class should only be used as Mixin to a AvdStructuredConfig class.
     """
 
-    @cached_property
-    def as_path(self: AvdStructuredConfigUnderlayProtocol) -> dict | None:
-        """Return structured config for as_path."""
+    @structured_config_contributor
+    def as_path(self: AvdStructuredConfigUnderlayProtocol) -> None:
+        """Set the structured config for as_path."""
         if self.shared_utils.underlay_routing_protocol != "ebgp":
-            return None
+            return
 
-        access_lists = []
         if self.shared_utils.wan_ha and self.shared_utils.use_uplinks_for_wan_ha:
-            access_lists.append(
-                {
-                    "name": "ASPATH-WAN",
-                    "entries": [
-                        {
-                            "type": "permit",
-                            "match": self.shared_utils.bgp_as,
-                        },
-                    ],
-                },
-            )
-
-        if access_lists:
-            return {"access_lists": access_lists}
-
-        return None
+            entries = EosCliConfigGen.AsPath.AccessListsItem.Entries()
+            entries.append_new(type="permit", match=self.shared_utils.bgp_as)
+            self.structured_config.as_path.access_lists.append_new(name="ASPATH-WAN", entries=entries)