func generateServiceName()

in controllers/utils.go [45:79]
29 lines of code
7 McCabe index (conditional complexity)

func generateServiceName(namespace string, name string, portStr string, serviceNameTemplate string) string {
	// The delimeter must be a character prohibited in kubernetes object names!
	nameString := strings.Join([]string{namespace, name, portStr}, ";")
	hash := fmt.Sprintf("%x", sha256.Sum256([]byte(nameString)))[:8]
	serviceTemplateTags := strings.Split(serviceNameTemplate, "-")

	var fieldsToTruncate []string
	for _, field := range serviceTemplateTags {
		switch field {
		case "{namespace}":
			fieldsToTruncate = append(fieldsToTruncate, namespace)
		case "{name}":
			fieldsToTruncate = append(fieldsToTruncate, name)
		case "{port}":
			fieldsToTruncate = append(fieldsToTruncate, portStr)
		}
	}

	// maxNameLength is the max length of service name without hyphens and hash (8). 63 - hashlength - numberOfHyphens
	maxNegLengthWoHash := maxNameLength - strings.Count(serviceNameTemplate, "{hash}")*8 - strings.Count(serviceNameTemplate, "-")
	truncFields := TrimFieldsEvenly(maxNegLengthWoHash, fieldsToTruncate...)

	// form the final neg name string with hash
	var fields []string
	indexTruncFields := 0
	for _, field := range serviceTemplateTags {
		if field == "{hash}" {
			fields = append(fields, hash)
		} else {
			fields = append(fields, truncFields[indexTruncFields])
			indexTruncFields++
		}
	}
	return strings.Join(fields, "-")
}