github.com/percona/percona-xtradb-cluster-operator@v1.14.0/pkg/pxc/backup/names.go

package backup

import (
	api "github.com/percona/percona-xtradb-cluster-operator/pkg/apis/pxc/v1"
)

// GenName63 generates legit name for backup resources.
// k8s sets the `job-name` label for the created by job pod.
// So we have to be sure that job name won't be longer than 63 symbols.
// Yet the job name has to have some meaningful name which won't be conflicting with other jobs' names.
func GenName63(cr *api.PerconaXtraDBClusterBackup) string {
	postfix := cr.Name
	maxNameLen := 16
	typ, ok := cr.GetLabels()["type"]

	// in case it's not a cron-job we're not sure if the name fits rules
	// but there is more room for names
	if !ok || typ != "cron" {
		maxNameLen = 29
		postfix = trimNameRight(postfix, maxNameLen)
	}

	name := "xb-" + postfix

	return name
}

// trimNameRight if needed cut off symbol by symbol from the name right side
// until it satisfy requirements to end with an alphanumeric character and have a length no more than ln
func trimNameRight(name string, ln int) string {
	if len(name) <= ln {
		ln = len(name)
	}

	for ; ln > 0; ln-- {
		if name[ln-1] >= 'a' && name[ln-1] <= 'z' ||
			name[ln-1] >= '0' && name[ln-1] <= '9' {
			break
		}
	}

	return name[:ln]
}