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