fixed issues with schema of network policy

also fixed encoding of matahLabels. Now using json format so that it
also works for empty maps.

cmd/policygen/templates/netpol/namespace/dns.yaml

@@ -0,0 +1,19 @@
+{{- if not .Open }}
+
+---
+kind: NetworkPolicy
+apiVersion: networking.k8s.io/v1
+metadata:
+  name: allow-dns-in-namespace
+  namespace: {{ .Name }}
+spec:
+  podSelector: {}
+  policyTypes:
+    - Egress
+  egress:
+    - ports:
+        - port: 53
+          protocol: TCP
+        - port: 53
+          protocol: UDP
+{{- end }}

cmd/policygen/templates/netpol/pod/pod.yaml

@@ -8,9 +8,10 @@
 {{- end }}
 {{- define "peers" }}
       {{- range .Applications }}
+  - {{.Rule}}:
       # {{ .Application.Namespace.Name }}/{{ .Application.Name }}
       - podSelector:
-          matchLabels: {{ .Application.MatchLabels | toYaml | nindent 12 }}
+          matchLabels: {{ .Application.MatchLabels | toJson }}
         namespaceSelector:
           matchLabels:
             kubernetes.io/metadata.name: {{ .Application.Namespace.Name }}
@@ -22,6 +23,7 @@
 {{- end }}
 {{- define "networks" }}
       {{- range .Networks }}
+  - {{.Rule}}:
       # {{ .Network.Name }}
       - ipBlock:
           cidr: {{ .Network.CIDR}}
@@ -46,7 +48,8 @@ metadata:
   labels: {{ .labels | toYaml | nindent 4 }}
 spec:
   # {{ .app.Namespace.Name }}/{{ .app.Name }}
-  podSelector: {{ .app.MatchLabels | toYaml | nindent 4 }}
+  podSelector:
+    matchLabels: {{ .app.MatchLabels | toJson }}
   policyTypes:
     {{- if or .ingress.Applications .ingress.Networks }}
     - Ingress
@@ -57,14 +60,12 @@ spec:
 
   {{- if or .ingress.Applications .ingress.Networks }}
   ingress:
-    from:
       {{- template "peers" .ingress }}
       {{- template "networks" .ingress }}
   {{- end }}
 
   {{- if or .egress.Applications .egress.Networks }}
   egress:
-    to:
       {{- template "peers" .egress }}
       {{- template "networks" .egress }}
   {{- end }}