Golang GroupVersion.String方法代码示例

// DecodeToVersion converts a JSON string back into a pointer to an api object.
// Deduces the type based upon the fields added by the MetaInsertionFactory
// technique. The object will be converted, if necessary, into the versioned
// type before being returned. Decode will not decode objects without version
// set unless version is also "".
// a GroupVersion with .IsEmpty() == true is means "use the internal version for
// the object's group"
func (s *Scheme) DecodeToVersion(data []byte, gv unversioned.GroupVersion) (interface{}, error) {
	obj, sourceVersion, kind, err := s.DecodeToVersionedObject(data)
	if err != nil {
		return nil, err
	}
	// Version and Kind should be blank in memory.
	if err := s.SetVersionAndKind("", "", obj); err != nil {
		return nil, err
	}

	sourceGV, err := unversioned.ParseGroupVersion(sourceVersion)
	if err != nil {
		return nil, err
	}

	// if the gv is empty, then we want the internal version, but the internal version varies by
	// group.  We can lookup the group now because we have knowledge of the group
	if gv.IsEmpty() {
		exists := false
		gv, exists = s.InternalVersions[sourceGV.Group]
		if !exists {
			return nil, fmt.Errorf("no internalVersion specified for %v", gv)
		}
	}

	// Convert if needed.
	if gv != sourceGV {
		objOut, err := s.NewObject(gv.String(), kind)
		if err != nil {
			return nil, err
		}
		flags, meta := s.generateConvertMeta(sourceVersion, gv.String(), obj)
		if err := s.converter.Convert(obj, objOut, flags, meta); err != nil {
			return nil, err
		}
		obj = objOut
	}
	return obj, nil
}

See the License for the specific language governing permissions and
limitations under the License.
*/

package v1alpha1

import (
	"github.com/jordic/k8s/cloudsqlip/Godeps/_workspace/src/k8s.io/kubernetes/pkg/api"
	"github.com/jordic/k8s/cloudsqlip/Godeps/_workspace/src/k8s.io/kubernetes/pkg/api/unversioned"
	"github.com/jordic/k8s/cloudsqlip/Godeps/_workspace/src/k8s.io/kubernetes/pkg/runtime"
)

// SchemeGroupVersion is group version used to register these objects
var SchemeGroupVersion = unversioned.GroupVersion{Group: "metrics", Version: "v1alpha1"}

var Codec = runtime.CodecFor(api.Scheme, SchemeGroupVersion.String())

func init() {
	// Register the API.
	addKnownTypes()
}

// Adds the list of known types to api.Scheme.
func addKnownTypes() {
	api.Scheme.AddKnownTypes(SchemeGroupVersion,
		&RawNode{},
		&RawPod{},
	)
}

func (*RawNode) IsAnAPIObject() {}

// NegotiateVersion queries the server's supported api versions to find
// a version that both client and server support.
// - If no version is provided, try registered client versions in order of
//   preference.
// - If version is provided, but not default config (explicitly requested via
//   commandline flag), and is unsupported by the server, print a warning to
//   stderr and try client's registered versions in order of preference.
// - If version is config default, and the server does not support it,
//   return an error.
func NegotiateVersion(client *Client, c *Config, requestedGV *unversioned.GroupVersion, clientRegisteredGVs []unversioned.GroupVersion) (*unversioned.GroupVersion, error) {
	var err error
	if client == nil {
		client, err = New(c)
		if err != nil {
			return nil, err
		}
	}
	clientVersions := sets.String{}
	for _, gv := range clientRegisteredGVs {
		clientVersions.Insert(gv.String())
	}
	apiVersions, err := client.ServerAPIVersions()
	if err != nil {
		// This is almost always a connection error, and higher level code should treat this as a generic error,
		// not a negotiation specific error.
		return nil, err
	}
	serverVersions := sets.String{}
	for _, v := range apiVersions.Versions {
		serverVersions.Insert(v)
	}

	// If no version requested, use config version (may also be empty).
	// make a copy of the original so we don't risk mutating input here or in the returned value
	var preferredGV *unversioned.GroupVersion
	switch {
	case requestedGV != nil:
		t := *requestedGV
		preferredGV = &t
	case c.GroupVersion != nil:
		t := *c.GroupVersion
		preferredGV = &t
	}

	// If version explicitly requested verify that both client and server support it.
	// If server does not support warn, but try to negotiate a lower version.
	if preferredGV != nil {
		if !clientVersions.Has(preferredGV.String()) {
			return nil, fmt.Errorf("client does not support API version %q; client supported API versions: %v", preferredGV, clientVersions)

		}
		if serverVersions.Has(preferredGV.String()) {
			return preferredGV, nil
		}
		// If we are using an explicit config version the server does not support, fail.
		if (c.GroupVersion != nil) && (*preferredGV == *c.GroupVersion) {
			return nil, fmt.Errorf("server does not support API version %q", preferredGV)
		}
	}

	for _, clientGV := range clientRegisteredGVs {
		if serverVersions.Has(clientGV.String()) {
			// Version was not explicitly requested in command config (--api-version).
			// Ok to fall back to a supported version with a warning.
			// TODO: caesarxuchao: enable the warning message when we have
			// proper fix. Please refer to issue #14895.
			// if len(version) != 0 {
			// 	glog.Warningf("Server does not support API version '%s'. Falling back to '%s'.", version, clientVersion)
			// }
			t := clientGV
			return &t, nil
		}
	}
	return nil, fmt.Errorf("failed to negotiate an api version; server supports: %v, client supports: %v",
		serverVersions, clientVersions)
}