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package nodeprovider
import (
"errors"
"fmt"
"regexp"
"strings"
)
var dns1123 = regexp.MustCompile(`^[a-z0-9]([a-z0-9.-]*[a-z0-9])?$`)
const HostnameMaxBytes = 64
var ErrBadName = errors.New("nodeprovider: derived node name is not DNS-1123")
func NodeName(clusterLabel, nodeID string) (string, error) {
if clusterLabel == "" || nodeID == "" {
return "", fmt.Errorf("%w: cluster and node id are both required", ErrBadName)
}
name := strings.ToLower(clusterLabel + "-" + nodeID)
if len(name) > 253 || !dns1123.MatchString(name) {
return "", fmt.Errorf("%w: %q", ErrBadName, name)
}
if len(name) > HostnameMaxBytes {
return "", fmt.Errorf("%w: %q is %d bytes, and a market node takes its node name as its hostname, "+
"which holds at most %d", ErrBadName, name, len(name), HostnameMaxBytes)
}
return name, nil
}
