144 lines
3.1 KiB
Go
144 lines
3.1 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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"sync"
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"github.com/containerd/containerd/namespaces"
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"github.com/pkg/errors"
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)
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var (
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// ErrTaskNotExists is returned when a task does not exist
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ErrTaskNotExists = errors.New("task does not exist")
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// ErrTaskAlreadyExists is returned when a task already exists
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ErrTaskAlreadyExists = errors.New("task already exists")
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)
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// NewTaskList returns a new TaskList
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func NewTaskList() *TaskList {
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return &TaskList{
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tasks: make(map[string]map[string]Task),
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}
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}
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// TaskList holds and provides locking around tasks
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type TaskList struct {
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mu sync.Mutex
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tasks map[string]map[string]Task
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}
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// Get a task
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func (l *TaskList) Get(ctx context.Context, id string) (Task, error) {
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l.mu.Lock()
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defer l.mu.Unlock()
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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 := l.tasks[namespace]
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if !ok {
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return nil, ErrTaskNotExists
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}
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t, ok := tasks[id]
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if !ok {
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return nil, ErrTaskNotExists
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}
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return t, nil
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}
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// GetAll tasks under a namespace
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func (l *TaskList) GetAll(ctx context.Context, noNS bool) ([]Task, error) {
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l.mu.Lock()
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defer l.mu.Unlock()
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var o []Task
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if noNS {
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for ns := range l.tasks {
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for _, t := range l.tasks[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 := l.tasks[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 (l *TaskList) Add(ctx context.Context, t Task) 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 l.AddWithNamespace(namespace, t)
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}
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// AddWithNamespace adds a task with the provided namespace
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func (l *TaskList) AddWithNamespace(namespace string, t Task) error {
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l.mu.Lock()
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defer l.mu.Unlock()
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id := t.ID()
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if _, ok := l.tasks[namespace]; !ok {
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l.tasks[namespace] = make(map[string]Task)
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}
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if _, ok := l.tasks[namespace][id]; ok {
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return errors.Wrap(ErrTaskAlreadyExists, id)
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}
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l.tasks[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 (l *TaskList) Delete(ctx context.Context, id string) {
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l.mu.Lock()
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defer l.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 := l.tasks[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 (l *TaskList) IsEmpty() bool {
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l.mu.Lock()
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defer l.mu.Unlock()
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for ns := range l.tasks {
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if len(l.tasks[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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