93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
package containerd
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import (
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"context"
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"time"
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leasesapi "github.com/containerd/containerd/api/services/leases/v1"
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"github.com/containerd/containerd/leases"
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)
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// Lease is used to hold a reference to active resources which have not been
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// referenced by a root resource. This is useful for preventing garbage
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// collection of resources while they are actively being updated.
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type Lease struct {
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id string
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createdAt time.Time
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client *Client
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}
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// CreateLease creates a new lease
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func (c *Client) CreateLease(ctx context.Context) (Lease, error) {
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lapi := leasesapi.NewLeasesClient(c.conn)
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resp, err := lapi.Create(ctx, &leasesapi.CreateRequest{})
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if err != nil {
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return Lease{}, err
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}
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return Lease{
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id: resp.Lease.ID,
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client: c,
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}, nil
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}
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// ListLeases lists active leases
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func (c *Client) ListLeases(ctx context.Context) ([]Lease, error) {
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lapi := leasesapi.NewLeasesClient(c.conn)
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resp, err := lapi.List(ctx, &leasesapi.ListRequest{})
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if err != nil {
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return nil, err
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}
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leases := make([]Lease, len(resp.Leases))
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for i := range resp.Leases {
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leases[i] = Lease{
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id: resp.Leases[i].ID,
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createdAt: resp.Leases[i].CreatedAt,
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client: c,
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}
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}
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return leases, nil
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}
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// WithLease attaches a lease on the context
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func (c *Client) WithLease(ctx context.Context) (context.Context, func() error, error) {
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_, ok := leases.Lease(ctx)
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if ok {
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return ctx, func() error {
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return nil
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}, nil
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}
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l, err := c.CreateLease(ctx)
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if err != nil {
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return nil, nil, err
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}
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ctx = leases.WithLease(ctx, l.ID())
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return ctx, func() error {
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return l.Delete(ctx)
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}, nil
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}
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// ID returns the lease ID
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func (l Lease) ID() string {
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return l.id
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}
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// CreatedAt returns the time at which the lease was created
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func (l Lease) CreatedAt() time.Time {
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return l.createdAt
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}
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// Delete deletes the lease, removing the reference to all resources created
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// during the lease.
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func (l Lease) Delete(ctx context.Context) error {
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lapi := leasesapi.NewLeasesClient(l.client.conn)
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_, err := lapi.Delete(ctx, &leasesapi.DeleteRequest{
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ID: l.id,
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})
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return err
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}
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