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Replace snapshotter in pkg/backends with a GCE cloud lister implement…
…ation that is solely used for garbage collection
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /* | ||
| Copyright 2018 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 cloudlist | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/golang/glog" | ||
| ) | ||
|
|
||
| // Lister is an interface to list the names of one specific object from the cloud. | ||
| type Lister interface { | ||
| // List returns the names of one specific object from the cloud. | ||
| List() ([]string, error) | ||
| } | ||
|
|
||
| type keyFunc func(interface{}) (string, error) | ||
|
|
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| type objectLister interface { | ||
| List() ([]interface{}, error) | ||
| } | ||
|
|
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| // GCECLister lists the names of a single GCE object. | ||
| type GCELister struct { | ||
| // name is used to distinguish different listers in the logs. | ||
| name string | ||
| // An interface that lists objects of a specific type from GCE. | ||
| objectLister objectLister | ||
| // A function capable of producing a key for a given object. | ||
| keyGetter keyFunc | ||
| } | ||
|
|
||
| // List implements Lister. | ||
| func (c *GCELister) List() ([]string, error) { | ||
| glog.V(4).Infof("GCELister %q is pulling objects", c.name) | ||
|
|
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| items, err := c.objectLister.List() | ||
| if err != nil { | ||
| return []string{}, fmt.Errorf("Failed to list %q: %v", c.name, err) | ||
| } | ||
|
|
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| objectNames := make([]string, 0) | ||
| for i := range items { | ||
| key, err := c.keyGetter(items[i]) | ||
| if err != nil { | ||
| glog.V(5).Infof("GCELister %q failed to extract key from object %+v: %v", c.name, i, err) | ||
| continue | ||
| } | ||
| objectNames = append(objectNames, key) | ||
| } | ||
|
|
||
| return objectNames, nil | ||
| } | ||
|
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| // NewGCELister lists the names of a specific object from GCE. | ||
| func NewGCELister(name string, k keyFunc, objectLister objectLister) Lister { | ||
| gceLister := &GCELister{ | ||
| name: name, | ||
| objectLister: objectLister, | ||
| keyGetter: k, | ||
| } | ||
| glog.V(4).Infof("Starting GCELister %q", gceLister.name) | ||
| return gceLister | ||
| } |
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