|
| 1 | +package images |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "sync" |
| 6 | + |
| 7 | + "github.com/containerd/containerd/content" |
| 8 | + c8derrdefs "github.com/containerd/containerd/errdefs" |
| 9 | + "github.com/containerd/containerd/leases" |
| 10 | + "github.com/containerd/containerd/log" |
| 11 | + "github.com/containerd/containerd/namespaces" |
| 12 | + "github.com/docker/docker/distribution" |
| 13 | + "github.com/docker/docker/image" |
| 14 | + "github.com/docker/docker/layer" |
| 15 | + digest "github.com/opencontainers/go-digest" |
| 16 | + "github.com/pkg/errors" |
| 17 | + "github.com/sirupsen/logrus" |
| 18 | +) |
| 19 | + |
| 20 | +func imageKey(dgst digest.Digest) string { |
| 21 | + return "moby-image-" + dgst.String() |
| 22 | +} |
| 23 | + |
| 24 | +// imageStoreWithLease wraps the configured image store with one that deletes the lease |
| 25 | +// reigstered for a given image ID, if one exists |
| 26 | +// |
| 27 | +// This is used by the main image service to wrap delete calls to the real image store. |
| 28 | +type imageStoreWithLease struct { |
| 29 | + image.Store |
| 30 | + leases leases.Manager |
| 31 | + |
| 32 | + // Normally we'd pass namespace down through a context.Context, however... |
| 33 | + // The interface for image store doesn't allow this, so we store it here. |
| 34 | + ns string |
| 35 | +} |
| 36 | + |
| 37 | +func (s *imageStoreWithLease) Delete(id image.ID) ([]layer.Metadata, error) { |
| 38 | + ctx := namespaces.WithNamespace(context.TODO(), s.ns) |
| 39 | + if err := s.leases.Delete(ctx, leases.Lease{ID: imageKey(digest.Digest(id))}); err != nil && !c8derrdefs.IsNotFound(err) { |
| 40 | + return nil, errors.Wrap(err, "error deleting lease") |
| 41 | + } |
| 42 | + return s.Store.Delete(id) |
| 43 | +} |
| 44 | + |
| 45 | +// iamgeStoreForPull is created for each pull It wraps an underlying image store |
| 46 | +// to handle registering leases for content fetched in a single image pull. |
| 47 | +type imageStoreForPull struct { |
| 48 | + distribution.ImageConfigStore |
| 49 | + leases leases.Manager |
| 50 | + ingested *contentStoreForPull |
| 51 | +} |
| 52 | + |
| 53 | +func (s *imageStoreForPull) Put(ctx context.Context, config []byte) (digest.Digest, error) { |
| 54 | + id, err := s.ImageConfigStore.Put(ctx, config) |
| 55 | + if err != nil { |
| 56 | + return "", err |
| 57 | + } |
| 58 | + return id, s.updateLease(ctx, id) |
| 59 | +} |
| 60 | + |
| 61 | +func (s *imageStoreForPull) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) { |
| 62 | + id, err := s.ImageConfigStore.Get(ctx, dgst) |
| 63 | + if err != nil { |
| 64 | + return nil, err |
| 65 | + } |
| 66 | + return id, s.updateLease(ctx, dgst) |
| 67 | +} |
| 68 | + |
| 69 | +func (s *imageStoreForPull) updateLease(ctx context.Context, dgst digest.Digest) error { |
| 70 | + leaseID := imageKey(dgst) |
| 71 | + lease, err := s.leases.Create(ctx, leases.WithID(leaseID)) |
| 72 | + if err != nil { |
| 73 | + if !c8derrdefs.IsAlreadyExists(err) { |
| 74 | + return errors.Wrap(err, "error creating lease") |
| 75 | + } |
| 76 | + lease = leases.Lease{ID: leaseID} |
| 77 | + } |
| 78 | + |
| 79 | + digested := s.ingested.getDigested() |
| 80 | + resource := leases.Resource{ |
| 81 | + Type: "content", |
| 82 | + } |
| 83 | + for _, dgst := range digested { |
| 84 | + log.G(ctx).WithFields(logrus.Fields{ |
| 85 | + "digest": dgst, |
| 86 | + "lease": lease.ID, |
| 87 | + }).Debug("Adding content digest to lease") |
| 88 | + |
| 89 | + resource.ID = dgst.String() |
| 90 | + if err := s.leases.AddResource(ctx, lease, resource); err != nil { |
| 91 | + return errors.Wrapf(err, "error adding content digest to lease: %s", dgst) |
| 92 | + } |
| 93 | + } |
| 94 | + return nil |
| 95 | +} |
| 96 | + |
| 97 | +// contentStoreForPull is used to wrap the configured content store to |
| 98 | +// add lease management for a single `pull` |
| 99 | +// It stores all committed digests so that `imageStoreForPull` can add |
| 100 | +// the digsted resources to the lease for an image. |
| 101 | +type contentStoreForPull struct { |
| 102 | + distribution.ContentStore |
| 103 | + leases leases.Manager |
| 104 | + |
| 105 | + mu sync.Mutex |
| 106 | + digested []digest.Digest |
| 107 | +} |
| 108 | + |
| 109 | +func (c *contentStoreForPull) addDigested(dgst digest.Digest) { |
| 110 | + c.mu.Lock() |
| 111 | + c.digested = append(c.digested, dgst) |
| 112 | + c.mu.Unlock() |
| 113 | +} |
| 114 | + |
| 115 | +func (c *contentStoreForPull) getDigested() []digest.Digest { |
| 116 | + c.mu.Lock() |
| 117 | + digested := make([]digest.Digest, len(c.digested)) |
| 118 | + copy(digested, c.digested) |
| 119 | + c.mu.Unlock() |
| 120 | + return digested |
| 121 | +} |
| 122 | + |
| 123 | +func (c *contentStoreForPull) Writer(ctx context.Context, opts ...content.WriterOpt) (content.Writer, error) { |
| 124 | + w, err := c.ContentStore.Writer(ctx, opts...) |
| 125 | + if err != nil { |
| 126 | + if c8derrdefs.IsAlreadyExists(err) { |
| 127 | + var cfg content.WriterOpts |
| 128 | + for _, o := range opts { |
| 129 | + if err := o(&cfg); err != nil { |
| 130 | + return nil, err |
| 131 | + } |
| 132 | + |
| 133 | + } |
| 134 | + c.addDigested(cfg.Desc.Digest) |
| 135 | + } |
| 136 | + return nil, err |
| 137 | + } |
| 138 | + return &contentWriter{ |
| 139 | + cs: c, |
| 140 | + Writer: w, |
| 141 | + }, nil |
| 142 | +} |
| 143 | + |
| 144 | +type contentWriter struct { |
| 145 | + cs *contentStoreForPull |
| 146 | + content.Writer |
| 147 | +} |
| 148 | + |
| 149 | +func (w *contentWriter) Commit(ctx context.Context, size int64, expected digest.Digest, opts ...content.Opt) error { |
| 150 | + err := w.Writer.Commit(ctx, size, expected, opts...) |
| 151 | + if err == nil || c8derrdefs.IsAlreadyExists(err) { |
| 152 | + w.cs.addDigested(expected) |
| 153 | + } |
| 154 | + return err |
| 155 | +} |
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