DockerCLI/cli/command/stack/kubernetes/collision.go

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package kubernetes
import (
"fmt"
"sort"
composetypes "github.com/docker/cli/cli/compose/types"
apiv1beta1 "github.com/docker/cli/kubernetes/compose/v1beta1"
"github.com/docker/cli/kubernetes/labels"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
)
// IsColliding verify that services defined in the stack collides with already deployed services
func IsColliding(services corev1.ServiceInterface, stack *apiv1beta1.Stack, cfg *composetypes.Config) error {
stackObjects := getServices(cfg)
for _, srv := range stackObjects {
if err := verify(services, stack.Name, srv); err != nil {
return err
}
}
return nil
}
// verify checks wether the service is already present in kubernetes.
// If we find the service by name but it doesn't have our label or it has a different value
// than the stack name for the label, we fail (i.e. it will collide)
func verify(services corev1.ServiceInterface, stackName string, service string) error {
svc, err := services.Get(service, metav1.GetOptions{})
if err == nil {
if key, ok := svc.ObjectMeta.Labels[labels.ForStackName]; ok {
if key != stackName {
return fmt.Errorf("service %s already present in stack named %s", service, key)
}
return nil
}
return fmt.Errorf("service %s already present in the cluster", service)
}
return nil
}
func getServices(cfg *composetypes.Config) []string {
services := make([]string, len(cfg.Services))
for i := range cfg.Services {
services[i] = cfg.Services[i].Name
}
sort.Strings(services)
return services
}