// 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], } }
// 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 }
// 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) }