[common] Add common chart from KaH

charts/common/templates/classes/_service_ports.tpl

@@ -0,0 +1,27 @@
+{{/*
+Return the primary port for a given Service object.
+*/}}
+{{- define "common.classes.service.ports.primary" -}}
+  {{- $enabledPorts := dict -}}
+  {{- range $name, $port := .values.ports -}}
+    {{- if $port.enabled -}}
+      {{- $_ := set $enabledPorts $name . -}}
+    {{- end -}}
+  {{- end -}}
+
+  {{- if eq 0 (len $enabledPorts) }}
+    {{- fail (printf "No ports are enabled for service \"%s\"!" .serviceName) }}
+  {{- end }}
+
+  {{- $result := "" -}}
+  {{- range $name, $port := $enabledPorts -}}
+    {{- if and (hasKey $port "primary") $port.primary -}}
+      {{- $result = $name -}}
+    {{- end -}}
+  {{- end -}}
+
+  {{- if not $result -}}
+    {{- $result = keys $enabledPorts | first -}}
+  {{- end -}}
+  {{- $result -}}
+{{- end -}}