// SwaggerSchema retrieves and parses the swagger API schema the server supports.
func (d *DiscoveryClient) SwaggerSchema(version unversioned.GroupVersion) (*swagger.ApiDeclaration, error) {
if version.IsEmpty() {
return nil, fmt.Errorf("groupVersion cannot be empty")
}
groupList, err := d.ServerGroups()
if err != nil {
return nil, err
}
groupVersions := ExtractGroupVersions(groupList)
// This check also takes care the case that kubectl is newer than the running endpoint
if stringDoesntExistIn(version.String(), groupVersions) {
return nil, fmt.Errorf("API version: %v is not supported by the server. Use one of: %v", version, groupVersions)
}
var path string
if version == v1.SchemeGroupVersion {
path = "/swaggerapi/api/" + version.Version
} else {
path = "/swaggerapi/apis/" + version.Group + "/" + version.Version
}
body, err := d.Get().AbsPath(path).Do().Raw()
if err != nil {
return nil, err
}
var schema swagger.ApiDeclaration
err = json.Unmarshal(body, &schema)
if err != nil {
return nil, fmt.Errorf("got '%s': %v", string(body), err)
}
return &schema, nil
}
// 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, targetVersion unversioned.GroupVersion) (interface{}, error) {
obj, sourceKind, 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
}
// if the targetVersion 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 targetVersion.IsEmpty() {
exists := false
targetVersion, exists = s.InternalVersions[sourceKind.Group]
if !exists {
return nil, fmt.Errorf("no internalVersion specified for %v", targetVersion)
}
}
// Convert if needed.
if targetVersion != sourceKind.GroupVersion() {
objOut, err := s.NewObject(targetVersion.WithKind(sourceKind.Kind))
if err != nil {
return nil, err
}
flags, meta := s.generateConvertMeta(sourceKind.GroupVersion(), targetVersion, obj)
if err := s.converter.Convert(obj, objOut, flags, meta); err != nil {
return nil, err
}
obj = objOut
}
return obj, nil
}
// generateConvertMeta constructs the meta value we pass to Convert.
func (s *Scheme) generateConvertMeta(srcGroupVersion, destGroupVersion unversioned.GroupVersion, in interface{}) (FieldMatchingFlags, *Meta) {
t := reflect.TypeOf(in)
return s.converter.inputDefaultFlags[t], &Meta{
SrcVersion: srcGroupVersion.String(),
DestVersion: destGroupVersion.String(),
KeyNameMapping: s.converter.inputFieldMappingFuncs[t],
}
}
// AddKnownTypes registers all types passed in 'types' as being members of version 'version'.
// Encode() will refuse objects unless their type has been registered with AddKnownTypes.
// All objects passed to types should be pointers to structs. The name that go reports for
// the struct becomes the "kind" field when encoding.
func (s *Scheme) AddKnownTypes(gv unversioned.GroupVersion, types ...interface{}) {
for _, obj := range types {
t := reflect.TypeOf(obj)
if t.Kind() != reflect.Ptr {
panic("All types must be pointers to structs.")
}
t = t.Elem()
if t.Kind() != reflect.Struct {
panic("All types must be pointers to structs.")
}
gvk := gv.WithKind(t.Name())
s.gvkToType[gvk] = t
s.typeToGVK[t] = append(s.typeToGVK[t], gvk)
}
}
// 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())
}
groups, err := client.ServerGroups()
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
}
versions := ExtractGroupVersions(groups)
serverVersions := sets.String{}
for _, v := range 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)
}
