fix: routegroup does not apply default algorithm

dataclients/kubernetes/definitions/routegroups.go

@@ -231,10 +231,6 @@ func (sb *SkipperBackend) UnmarshalJSON(value []byte) error {
 		perr = err
 	}
 
-	if a == loadbalancer.None {
-		a = loadbalancer.RoundRobin
-	}
-
 	var b SkipperBackend
 	b.Name = p.Name
 	b.Type = bt

dataclients/kubernetes/testdata/routegroups/loadbalancer-algorithm/default-ch-algorithm-with-override.eskip

@@ -0,0 +1,6 @@
+kube_rg__default__myapp__all__0_0:
+	Host("^(example[.]org[.]?(:[0-9]+)?)$")
+	&& PathSubtree("/")
+	-> <powerOfRandomNChoices, "http://10.2.9.103:7272", "http://10.2.9.104:7272">;
+
+kube_rg____example_org__catchall__0_0: Host("^(example[.]org[.]?(:[0-9]+)?)$") -> <shunt>;

dataclients/kubernetes/testdata/routegroups/loadbalancer-algorithm/default-ch-algorithm-with-override.kube

@@ -0,0 +1 @@
+default-lb-algorithm: consistentHash

dataclients/kubernetes/testdata/routegroups/loadbalancer-algorithm/default-ch-algorithm-with-override.yaml

@@ -0,0 +1,50 @@
+apiVersion: zalando.org/v1
+kind: RouteGroup
+metadata:
+  name: myapp
+spec:
+  hosts:
+  - example.org
+  backends:
+  - name: myapp
+    type: service
+    serviceName: myapp
+    servicePort: 80
+    algorithm: powerOfRandomNChoices
+  routes:
+  - pathSubtree: /
+    backends:
+    - backendName: myapp
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    application: myapp
+  name: myapp
+spec:
+  clusterIP: 10.3.190.97
+  ports:
+  - name: main
+    port: 80
+    protocol: TCP
+    targetPort: 7272
+  selector:
+    application: myapp
+  type: ClusterIP
+---
+apiVersion: v1
+kind: Endpoints
+metadata:
+  labels:
+    application: myapp
+  name: myapp
+  namespace: default
+subsets:
+- addresses:
+  - ip: 10.2.9.103
+  - ip: 10.2.9.104
+  ports:
+  - name: main
+    port: 7272
+    protocol: TCP

dataclients/kubernetes/testdata/routegroups/loadbalancer-algorithm/default-ch-algorithm-with-wrong-spelling.eskip

@@ -0,0 +1,6 @@
+kube_rg__default__myapp__all__0_0:
+	Host("^(example[.]org[.]?(:[0-9]+)?)$")
+	&& PathSubtree("/")
+	-> <roundRobin, "http://10.2.9.103:7272", "http://10.2.9.104:7272">;
+
+kube_rg____example_org__catchall__0_0: Host("^(example[.]org[.]?(:[0-9]+)?)$") -> <shunt>;

dataclients/kubernetes/testdata/routegroups/loadbalancer-algorithm/default-ch-algorithm-with-wrong-spelling.kube

@@ -0,0 +1 @@
+default-lb-algorithm: does-not-exist

dataclients/kubernetes/testdata/routegroups/loadbalancer-algorithm/default-ch-algorithm-with-wrong-spelling.yaml

@@ -0,0 +1,49 @@
+apiVersion: zalando.org/v1
+kind: RouteGroup
+metadata:
+  name: myapp
+spec:
+  hosts:
+  - example.org
+  backends:
+  - name: myapp
+    type: service
+    serviceName: myapp
+    servicePort: 80
+  routes:
+  - pathSubtree: /
+    backends:
+    - backendName: myapp
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    application: myapp
+  name: myapp
+spec:
+  clusterIP: 10.3.190.97
+  ports:
+  - name: main
+    port: 80
+    protocol: TCP
+    targetPort: 7272
+  selector:
+    application: myapp
+  type: ClusterIP
+---
+apiVersion: v1
+kind: Endpoints
+metadata:
+  labels:
+    application: myapp
+  name: myapp
+  namespace: default
+subsets:
+- addresses:
+  - ip: 10.2.9.103
+  - ip: 10.2.9.104
+  ports:
+  - name: main
+    port: 7272
+    protocol: TCP

dataclients/kubernetes/testdata/routegroups/loadbalancer-algorithm/default-ch-algorithm.eskip

@@ -1,6 +1,6 @@
 kube_rg__default__myapp__all__0_0:
 	Host("^(example[.]org[.]?(:[0-9]+)?)$")
 	&& PathSubtree("/")
-	-> <roundRobin, "http://10.2.9.103:7272", "http://10.2.9.104:7272">;
+	-> <consistentHash, "http://10.2.9.103:7272", "http://10.2.9.104:7272">;
 
 kube_rg____example_org__catchall__0_0: Host("^(example[.]org[.]?(:[0-9]+)?)$") -> <shunt>;

dataclients/kubernetes/testdata/routegroups/loadbalancer-algorithm/default-ch-algorithm.kube

@@ -1 +1 @@
-default-lb-algorithm: consistantHash
+default-lb-algorithm: consistentHash