diff options
Diffstat (limited to 'vendor/k8s.io/client-go/tools/pager/pager.go')
-rw-r--r-- | vendor/k8s.io/client-go/tools/pager/pager.go | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/vendor/k8s.io/client-go/tools/pager/pager.go b/vendor/k8s.io/client-go/tools/pager/pager.go deleted file mode 100644 index 2e0874e0e..000000000 --- a/vendor/k8s.io/client-go/tools/pager/pager.go +++ /dev/null @@ -1,118 +0,0 @@ -/* -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 pager - -import ( - "fmt" - - "golang.org/x/net/context" - - "k8s.io/apimachinery/pkg/api/errors" - "k8s.io/apimachinery/pkg/api/meta" - metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion" - metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" - "k8s.io/apimachinery/pkg/runtime" -) - -const defaultPageSize = 500 - -// ListPageFunc returns a list object for the given list options. -type ListPageFunc func(ctx context.Context, opts metav1.ListOptions) (runtime.Object, error) - -// SimplePageFunc adapts a context-less list function into one that accepts a context. -func SimplePageFunc(fn func(opts metav1.ListOptions) (runtime.Object, error)) ListPageFunc { - return func(ctx context.Context, opts metav1.ListOptions) (runtime.Object, error) { - return fn(opts) - } -} - -// ListPager assists client code in breaking large list queries into multiple -// smaller chunks of PageSize or smaller. PageFn is expected to accept a -// metav1.ListOptions that supports paging and return a list. The pager does -// not alter the field or label selectors on the initial options list. -type ListPager struct { - PageSize int64 - PageFn ListPageFunc - - FullListIfExpired bool -} - -// New creates a new pager from the provided pager function using the default -// options. It will fall back to a full list if an expiration error is encountered -// as a last resort. -func New(fn ListPageFunc) *ListPager { - return &ListPager{ - PageSize: defaultPageSize, - PageFn: fn, - FullListIfExpired: true, - } -} - -// TODO: introduce other types of paging functions - such as those that retrieve from a list -// of namespaces. - -// List returns a single list object, but attempts to retrieve smaller chunks from the -// server to reduce the impact on the server. If the chunk attempt fails, it will load -// the full list instead. The Limit field on options, if unset, will default to the page size. -func (p *ListPager) List(ctx context.Context, options metav1.ListOptions) (runtime.Object, error) { - if options.Limit == 0 { - options.Limit = p.PageSize - } - var list *metainternalversion.List - for { - obj, err := p.PageFn(ctx, options) - if err != nil { - if !errors.IsResourceExpired(err) || !p.FullListIfExpired { - return nil, err - } - // the list expired while we were processing, fall back to a full list - options.Limit = 0 - options.Continue = "" - return p.PageFn(ctx, options) - } - m, err := meta.ListAccessor(obj) - if err != nil { - return nil, fmt.Errorf("returned object must be a list: %v", err) - } - - // exit early and return the object we got if we haven't processed any pages - if len(m.GetContinue()) == 0 && list == nil { - return obj, nil - } - - // initialize the list and fill its contents - if list == nil { - list = &metainternalversion.List{Items: make([]runtime.Object, 0, options.Limit+1)} - list.ResourceVersion = m.GetResourceVersion() - list.SelfLink = m.GetSelfLink() - } - if err := meta.EachListItem(obj, func(obj runtime.Object) error { - list.Items = append(list.Items, obj) - return nil - }); err != nil { - return nil, err - } - - // if we have no more items, return the list - if len(m.GetContinue()) == 0 { - return list, nil - } - - // set the next loop up - options.Continue = m.GetContinue() - } -} |