Move ingress handling to a resource processor

This change moves the handling of IngressClasses and Ingresses to their
own resource processors. Because this was the last Kubernetes type being
handled by the fetcher, we also remove the legacy code for handling
different types. Going forward, all new Kubernetes object handling will
go into a separate processor type.

CHANGELOG.md

@@ -67,7 +67,10 @@ Please see the [Envoy documentation](https://www.envoyproxy.io/docs/envoy/latest
 
 ## Next Release
 
+### Ambasssador API Gateway + Ambassador Edge Stack
+
 - Bugfix: Fix an issue that caused Dev Portal to sporadically respond with upstream connect timeout when loading content
+- Bugfix: Prevent potential reconcile loop when updating the status of an Ingress.
 
 ## [1.11.1] February 04, 2021
 [1.11.1]: https://github.com/datawire/ambassador/compare/v1.11.0...v1.11.1

python/ambassador/config/config.py

@@ -148,8 +148,6 @@ def __init__(self, schema_dir_path: Optional[str]=None) -> None:
 
         self.logger.debug("SCHEMA DIR    %s" % os.path.abspath(self.schema_dir_path))
         self.k8s_status_updates: Dict[str, Tuple[str, str, Optional[Dict[str, Any]]]] = {}  # Tuple is (name, namespace, status_json)
-        self.k8s_ingresses: Dict[str, Any] = {}
-        self.k8s_ingress_classes: Dict[str, Any] = {}
         self.pod_labels: Dict[str, str] = {}
         self._reset()
 

python/ambassador/fetch/dependency.py

@@ -42,6 +42,21 @@ def watt_key(self) -> str:
         return 'secret'
 
 
+class IngressClassesDependency (Dependency):
+    """
+    A dependency that provides the list of ingress classes that are valid (i.e.,
+    have the proper controller) for this cluster.
+    """
+
+    ingress_classes: MutableSet[str]
+
+    def __init__(self):
+        self.ingress_classes = set()
+
+    def watt_key(self) -> str:
+        return 'ingressclasses'
+
+
 D = TypeVar('D', bound=Dependency)