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package kubernetes
import (
apiv1alpha3 "github.com/docker/compose-on-kubernetes/api/compose/v1alpha3"
apiv1beta1 "github.com/docker/compose-on-kubernetes/api/compose/v1beta1"
apiv1beta2 "github.com/docker/compose-on-kubernetes/api/compose/v1beta2"
"github.com/pkg/errors"
apimachinerymetav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
)
// StackVersion represents the detected Compose Component on Kubernetes side.
type StackVersion string
const (
// StackAPIV1Beta1 is returned if it's the most recent version available.
StackAPIV1Beta1 = StackVersion("v1beta1")
// StackAPIV1Beta2 is returned if it's the most recent version available.
StackAPIV1Beta2 = StackVersion("v1beta2")
// StackAPIV1Alpha3 is returned if it's the most recent version available, and experimental flag is on.
StackAPIV1Alpha3 = StackVersion("v1alpha3")
)
// GetStackAPIVersion returns the most appropriate stack API version installed.
func GetStackAPIVersion(serverGroups discovery.ServerGroupsInterface) (StackVersion, error) {
groups, err := serverGroups.ServerGroups()
if err != nil {
return "", err
}
return getAPIVersion(groups)
}
func getAPIVersion(groups *metav1.APIGroupList) (StackVersion, error) {
switch {
case findVersion(apiv1alpha3.SchemeGroupVersion, groups.Groups):
return StackAPIV1Alpha3, nil
case findVersion(apiv1beta2.SchemeGroupVersion, groups.Groups):
return StackAPIV1Beta2, nil
case findVersion(apiv1beta1.SchemeGroupVersion, groups.Groups):
return StackAPIV1Beta1, nil
default:
return "", errors.New("failed to find a Stack API version")
}
}
func findVersion(stackAPI schema.GroupVersion, groups []apimachinerymetav1.APIGroup) bool {
for _, group := range groups {
if group.Name == stackAPI.Group {
for _, version := range group.Versions {
if version.Version == stackAPI.Version {
return true
}
}
}
}
return false
}
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