library-chart/chart/templates/classes/_service_ports.tpl

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{{/*
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 -}}