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package leaseutil
import (
"context"
"sync"
"time"
"github.com/containerd/containerd/leases"
"github.com/containerd/containerd/namespaces"
"github.com/pkg/errors"
)
func WithLease(ctx context.Context, ls leases.Manager, opts ...leases.Opt) (context.Context, func(context.Context) error, error) {
_, ok := leases.FromContext(ctx)
if ok {
return ctx, func(context.Context) error {
return nil
}, nil
}
lr, ctx, err := NewLease(ctx, ls, opts...)
if err != nil {
return ctx, nil, err
}
return ctx, func(ctx context.Context) error {
return ls.Delete(ctx, lr.l)
}, nil
}
func NewLease(ctx context.Context, lm leases.Manager, opts ...leases.Opt) (*LeaseRef, context.Context, error) {
l, err := lm.Create(ctx, append([]leases.Opt{leases.WithRandomID(), leases.WithExpiration(time.Hour)}, opts...)...)
if err != nil {
return nil, ctx, err
}
ctx = leases.WithLease(ctx, l.ID)
return &LeaseRef{lm: lm, l: l}, ctx, nil
}
type LeaseRef struct {
lm leases.Manager
l leases.Lease
once sync.Once
resources []leases.Resource
err error
}
func (l *LeaseRef) Discard() error {
return l.lm.Delete(context.Background(), l.l)
}
func (l *LeaseRef) Adopt(ctx context.Context) error {
l.once.Do(func() {
resources, err := l.lm.ListResources(ctx, l.l)
if err != nil {
l.err = err
return
}
l.resources = resources
})
if l.err != nil {
return l.err
}
currentID, ok := leases.FromContext(ctx)
if !ok {
return errors.Errorf("missing lease requirement for adopt")
}
for _, r := range l.resources {
if err := l.lm.AddResource(ctx, leases.Lease{ID: currentID}, r); err != nil {
return err
}
}
if len(l.resources) == 0 {
l.Discard()
return nil
}
go l.Discard()
return nil
}
func MakeTemporary(l *leases.Lease) error {
if l.Labels == nil {
l.Labels = map[string]string{}
}
l.Labels["buildkit/lease.temporary"] = time.Now().UTC().Format(time.RFC3339Nano)
return nil
}
func WithNamespace(lm leases.Manager, ns string) *Manager {
return &Manager{manager: lm, ns: ns}
}
type Manager struct {
manager leases.Manager
ns string
}
func (l *Manager) Namespace() string {
return l.ns
}
func (l *Manager) WithNamespace(ns string) *Manager {
return WithNamespace(l.manager, ns)
}
func (l *Manager) Create(ctx context.Context, opts ...leases.Opt) (leases.Lease, error) {
ctx = namespaces.WithNamespace(ctx, l.ns)
return l.manager.Create(ctx, opts...)
}
func (l *Manager) Delete(ctx context.Context, lease leases.Lease, opts ...leases.DeleteOpt) error {
ctx = namespaces.WithNamespace(ctx, l.ns)
return l.manager.Delete(ctx, lease, opts...)
}
func (l *Manager) List(ctx context.Context, filters ...string) ([]leases.Lease, error) {
ctx = namespaces.WithNamespace(ctx, l.ns)
return l.manager.List(ctx, filters...)
}
func (l *Manager) AddResource(ctx context.Context, lease leases.Lease, resource leases.Resource) error {
ctx = namespaces.WithNamespace(ctx, l.ns)
return l.manager.AddResource(ctx, lease, resource)
}
func (l *Manager) DeleteResource(ctx context.Context, lease leases.Lease, resource leases.Resource) error {
ctx = namespaces.WithNamespace(ctx, l.ns)
return l.manager.DeleteResource(ctx, lease, resource)
}
func (l *Manager) ListResources(ctx context.Context, lease leases.Lease) ([]leases.Resource, error) {
ctx = namespaces.WithNamespace(ctx, l.ns)
return l.manager.ListResources(ctx, lease)
}
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