| /* |
| Copyright 2017 The Kubernetes Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| package openapi |
| |
| import ( |
| "sync" |
| |
| "k8s.io/client-go/discovery" |
| ) |
| |
| // synchronizedOpenAPIGetter fetches the openapi schema once and then caches it in memory |
| type synchronizedOpenAPIGetter struct { |
| // Cached results |
| sync.Once |
| openAPISchema Resources |
| err error |
| |
| openAPIClient discovery.OpenAPISchemaInterface |
| } |
| |
| var _ Getter = &synchronizedOpenAPIGetter{} |
| |
| // Getter is an interface for fetching openapi specs and parsing them into an Resources struct |
| type Getter interface { |
| // OpenAPIData returns the parsed OpenAPIData |
| Get() (Resources, error) |
| } |
| |
| // NewOpenAPIGetter returns an object to return OpenAPIDatas which reads |
| // from a server, and then stores in memory for subsequent invocations |
| func NewOpenAPIGetter(openAPIClient discovery.OpenAPISchemaInterface) Getter { |
| return &synchronizedOpenAPIGetter{ |
| openAPIClient: openAPIClient, |
| } |
| } |
| |
| // Resources implements Getter |
| func (g *synchronizedOpenAPIGetter) Get() (Resources, error) { |
| g.Do(func() { |
| s, err := g.openAPIClient.OpenAPISchema() |
| if err != nil { |
| g.err = err |
| return |
| } |
| |
| g.openAPISchema, g.err = NewOpenAPIData(s) |
| }) |
| |
| // Return the save result |
| return g.openAPISchema, g.err |
| } |