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