github.com/timstclair/heapster@v0.20.0-alpha1/Godeps/_workspace/src/k8s.io/kubernetes/pkg/api/rest/delete.go (about) 1 /* 2 Copyright 2014 The Kubernetes Authors All rights reserved. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package rest 18 19 import ( 20 "time" 21 22 "k8s.io/kubernetes/pkg/api" 23 "k8s.io/kubernetes/pkg/api/unversioned" 24 "k8s.io/kubernetes/pkg/runtime" 25 ) 26 27 // RESTDeleteStrategy defines deletion behavior on an object that follows Kubernetes 28 // API conventions. 29 type RESTDeleteStrategy interface { 30 runtime.ObjectTyper 31 32 // CheckGracefulDelete should return true if the object can be gracefully deleted and set 33 // any default values on the DeleteOptions. 34 CheckGracefulDelete(obj runtime.Object, options *api.DeleteOptions) bool 35 } 36 37 // BeforeDelete tests whether the object can be gracefully deleted. If graceful is set the object 38 // should be gracefully deleted, if gracefulPending is set the object has already been gracefully deleted 39 // (and the provided grace period is longer than the time to deletion), and an error is returned if the 40 // condition cannot be checked or the gracePeriodSeconds is invalid. The options argument may be updated with 41 // default values if graceful is true. 42 func BeforeDelete(strategy RESTDeleteStrategy, ctx api.Context, obj runtime.Object, options *api.DeleteOptions) (graceful, gracefulPending bool, err error) { 43 if strategy == nil { 44 return false, false, nil 45 } 46 objectMeta, _, kerr := objectMetaAndKind(strategy, obj) 47 if kerr != nil { 48 return false, false, kerr 49 } 50 51 // if the object is already being deleted 52 if objectMeta.DeletionTimestamp != nil { 53 // if we are already being deleted, we may only shorten the deletion grace period 54 // this means the object was gracefully deleted previously but deletionGracePeriodSeconds was not set, 55 // so we force deletion immediately 56 if objectMeta.DeletionGracePeriodSeconds == nil { 57 return false, false, nil 58 } 59 // only a shorter grace period may be provided by a user 60 if options.GracePeriodSeconds != nil { 61 period := int64(*options.GracePeriodSeconds) 62 if period > *objectMeta.DeletionGracePeriodSeconds { 63 return false, true, nil 64 } 65 now := unversioned.NewTime(unversioned.Now().Add(time.Second * time.Duration(*options.GracePeriodSeconds))) 66 objectMeta.DeletionTimestamp = &now 67 objectMeta.DeletionGracePeriodSeconds = &period 68 options.GracePeriodSeconds = &period 69 return true, false, nil 70 } 71 // graceful deletion is pending, do nothing 72 options.GracePeriodSeconds = objectMeta.DeletionGracePeriodSeconds 73 return false, true, nil 74 } 75 76 if !strategy.CheckGracefulDelete(obj, options) { 77 return false, false, nil 78 } 79 now := unversioned.NewTime(unversioned.Now().Add(time.Second * time.Duration(*options.GracePeriodSeconds))) 80 objectMeta.DeletionTimestamp = &now 81 objectMeta.DeletionGracePeriodSeconds = options.GracePeriodSeconds 82 return true, false, nil 83 }