143 lines
2.9 KiB
Go
143 lines
2.9 KiB
Go
/*
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Copyright The containerd 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 runtime
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import (
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"context"
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"fmt"
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"sync"
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"github.com/containerd/containerd/errdefs"
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"github.com/containerd/containerd/namespaces"
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)
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type object interface {
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ID() string
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}
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// NSMap extends Map type with a notion of namespaces passed via Context.
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type NSMap[T object] struct {
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mu sync.Mutex
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objects map[string]map[string]T
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}
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// NewNSMap returns a new NSMap
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func NewNSMap[T object]() *NSMap[T] {
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return &NSMap[T]{
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objects: make(map[string]map[string]T),
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}
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}
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// Get a task
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func (m *NSMap[T]) Get(ctx context.Context, id string) (T, error) {
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m.mu.Lock()
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defer m.mu.Unlock()
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namespace, err := namespaces.NamespaceRequired(ctx)
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var t T
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if err != nil {
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return t, err
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}
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tasks, ok := m.objects[namespace]
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if !ok {
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return t, errdefs.ErrNotFound
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}
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t, ok = tasks[id]
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if !ok {
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return t, errdefs.ErrNotFound
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}
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return t, nil
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}
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// GetAll objects under a namespace
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func (m *NSMap[T]) GetAll(ctx context.Context, noNS bool) ([]T, error) {
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m.mu.Lock()
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defer m.mu.Unlock()
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var o []T
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if noNS {
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for ns := range m.objects {
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for _, t := range m.objects[ns] {
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o = append(o, t)
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}
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}
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return o, nil
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}
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namespace, err := namespaces.NamespaceRequired(ctx)
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if err != nil {
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return nil, err
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}
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tasks, ok := m.objects[namespace]
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if !ok {
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return o, nil
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}
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for _, t := range tasks {
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o = append(o, t)
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}
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return o, nil
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}
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// Add a task
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func (m *NSMap[T]) Add(ctx context.Context, t T) error {
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namespace, err := namespaces.NamespaceRequired(ctx)
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if err != nil {
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return err
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}
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return m.AddWithNamespace(namespace, t)
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}
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// AddWithNamespace adds a task with the provided namespace
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func (m *NSMap[T]) AddWithNamespace(namespace string, t T) error {
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m.mu.Lock()
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defer m.mu.Unlock()
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id := t.ID()
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if _, ok := m.objects[namespace]; !ok {
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m.objects[namespace] = make(map[string]T)
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}
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if _, ok := m.objects[namespace][id]; ok {
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return fmt.Errorf("%s: %w", id, errdefs.ErrAlreadyExists)
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}
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m.objects[namespace][id] = t
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return nil
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}
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// Delete a task
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func (m *NSMap[T]) Delete(ctx context.Context, id string) {
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m.mu.Lock()
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defer m.mu.Unlock()
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namespace, err := namespaces.NamespaceRequired(ctx)
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if err != nil {
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return
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}
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tasks, ok := m.objects[namespace]
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if ok {
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delete(tasks, id)
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}
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}
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func (m *NSMap[T]) IsEmpty() bool {
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m.mu.Lock()
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defer m.mu.Unlock()
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for ns := range m.objects {
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if len(m.objects[ns]) > 0 {
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return false
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}
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}
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return true
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}
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