[platform] Autodetect RobotLB (#1271)

If running in Hetzner and using Hetzner's cloud load balancers, node
ports need to be allocated for the load balancer to function correctly.
Therefore if RobotLB is enabled, we probably need to assign node ports.

Release note:
[platform] Autodetect if node ports should be assigned to load balancer
services.

packages/apps/ferretdb/templates/external-svc.yaml

@@ -8,7 +8,9 @@ spec:
   type: {{ ternary "LoadBalancer" "ClusterIP" .Values.external }}
   {{- if .Values.external }}
   externalTrafficPolicy: Local
+    {{- if (include "cozy-lib.network.disableLoadBalancerNodePorts" $ | fromYaml) }}
   allocateLoadBalancerNodePorts: false
+    {{- end }}
   {{- end }}
   ports:
   - name: ferretdb

packages/apps/http-cache/templates/haproxy/service.yaml

@@ -10,7 +10,9 @@ spec:
   type: {{ ternary "LoadBalancer" "ClusterIP" .Values.external }}
   {{- if .Values.external }}
   externalTrafficPolicy: Local
+    {{- if (include "cozy-lib.network.disableLoadBalancerNodePorts" $ | fromYaml) }}
   allocateLoadBalancerNodePorts: false
+    {{- end }}
   {{- end }}
   selector:
     app: {{ .Release.Name }}-haproxy

packages/apps/postgres/templates/external-svc.yaml

@@ -7,7 +7,9 @@ spec:
   type: {{ ternary "LoadBalancer" "ClusterIP" .Values.external }}
   {{- if .Values.external }}
   externalTrafficPolicy: Local
+    {{- if (include "cozy-lib.network.disableLoadBalancerNodePorts" $ | fromYaml) }}
   allocateLoadBalancerNodePorts: false
+    {{- end }}
   {{- end }}
   ports:
   - name: postgres

packages/apps/redis/templates/service.yaml

@@ -11,7 +11,9 @@ spec:
   type: {{ ternary "LoadBalancer" "ClusterIP" .Values.external }}
   {{- if .Values.external }}
   externalTrafficPolicy: Local
+    {{- if (include "cozy-lib.network.disableLoadBalancerNodePorts" $ | fromYaml) }}
   allocateLoadBalancerNodePorts: false
+    {{- end }}
   {{- end }}
   selector:
     app.kubernetes.io/component: redis

packages/apps/tcp-balancer/templates/service.yaml

@@ -10,7 +10,9 @@ spec:
   type: {{ ternary "LoadBalancer" "ClusterIP" .Values.external }}
   {{- if .Values.external }}
   externalTrafficPolicy: Local
+    {{- if (include "cozy-lib.network.disableLoadBalancerNodePorts" $ | fromYaml) }}
   allocateLoadBalancerNodePorts: false
+    {{- end }}
   {{- end }}
   selector:
     app: {{ .Release.Name }}-haproxy

packages/apps/virtual-machine/templates/service.yaml

@@ -13,7 +13,9 @@ metadata:
 spec:
   type: {{ ternary "LoadBalancer" "ClusterIP" .Values.external }}
   externalTrafficPolicy: Local
+    {{- if (include "cozy-lib.network.disableLoadBalancerNodePorts" $ | fromYaml) }}
   allocateLoadBalancerNodePorts: false
+    {{- end }}
   selector:
     {{- include "virtual-machine.selectorLabels" . | nindent 4 }}
   ports:

packages/apps/vm-instance/templates/service.yaml

@@ -13,7 +13,9 @@ metadata:
 spec:
   type: {{ ternary "LoadBalancer" "ClusterIP" .Values.external }}
   externalTrafficPolicy: Local
+    {{- if (include "cozy-lib.network.disableLoadBalancerNodePorts" $ | fromYaml) }}
   allocateLoadBalancerNodePorts: false
+    {{- end }}
   selector:
     {{- include "virtual-machine.selectorLabels" . | nindent 4 }}
   ports:

packages/library/cozy-lib/templates/_network.tpl

@@ -0,0 +1,23 @@
+{{- define "cozy-lib.network.defaultDisableLoadBalancerNodePorts" }}
+{{/* Default behavior prior to introduction */}}
+{{-   `true` }}
+{{- end }}
+
+{{/* 
+Invoke as {{ include "cozy-lib.network.disableLoadBalancerNodePorts" $ }}.
+Detects whether the current load balancer class requires nodeports to function
+correctly. Currently just checks if Hetzner's RobotLB is enabled, which does
+require nodeports, and so, returns `false`. Otherwise assumes that metallb is
+in use and returns `true`.
+*/}}
+
+{{- define "cozy-lib.network.disableLoadBalancerNodePorts" }}
+{{-   include "cozy-lib.loadCozyConfig" (list "" .) }}
+{{-   $cozyConfig := index . 1 "cozyConfig" }}
+{{-   if not $cozyConfig }}
+{{-     include "cozy-lib.network.defaultDisableLoadBalancerNodePorts" . }}
+{{-   else }}
+{{-     $enabledComponents := splitList "," ((index $cozyConfig.data "bundle-enable") | default "") }}
+{{-     not (has "robotlb" $enabledComponents) }}
+{{-   end }}
+{{- end }}