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Signed-off-by: Erik Sipsma <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| package cache | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/containerd/containerd/leases" | ||
| ctdsnapshots "github.com/containerd/containerd/snapshots" | ||
| cerrdefs "github.com/containerd/errdefs" | ||
| "github.com/moby/buildkit/client" | ||
| "github.com/moby/buildkit/snapshot" | ||
| "github.com/moby/buildkit/snapshot/containerd" | ||
| "github.com/moby/buildkit/solver/pb" | ||
| "github.com/moby/buildkit/util/bklog" | ||
| ) | ||
|
|
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| type AcquireSnapshotter interface { | ||
| Acquire(ctx context.Context, key string, sharingMode pb.CacheSharingOpt) (func() error, error) | ||
| } | ||
|
|
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| type CtdVolumeSnapshotter interface { | ||
| ctdsnapshots.Snapshotter | ||
| Name() string | ||
| AcquireSnapshotter | ||
| } | ||
|
|
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| type VolumeSnapshotter interface { | ||
| snapshot.MergeSnapshotter | ||
| AcquireSnapshotter | ||
| } | ||
|
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| func newVolumeSnapshotter(ctx context.Context, ctdSnapshoter CtdVolumeSnapshotter, leaseManager leases.Manager) VolumeSnapshotter { | ||
| return volumeSnapshotterAdapter{ | ||
| MergeSnapshotter: snapshot.NewMergeSnapshotter(ctx, containerd.NewSnapshotter( | ||
| ctdSnapshoter.Name(), | ||
| ctdSnapshoter, | ||
| "buildkit", | ||
| nil, // no idmapping | ||
| ), leaseManager), | ||
| base: ctdSnapshoter, | ||
| } | ||
|
|
||
| } | ||
|
|
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| type volumeSnapshotterAdapter struct { | ||
| snapshot.MergeSnapshotter | ||
| base CtdVolumeSnapshotter | ||
| } | ||
|
|
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| var _ VolumeSnapshotter = (*volumeSnapshotterAdapter)(nil) | ||
|
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| func (sn volumeSnapshotterAdapter) Acquire(ctx context.Context, key string, sharingMode pb.CacheSharingOpt) (func() error, error) { | ||
| return sn.base.Acquire(ctx, key, sharingMode) | ||
| } | ||
|
|
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| func (cm *cacheManager) GetOrInitVolume( | ||
| ctx context.Context, | ||
| id string, | ||
| sharingMode pb.CacheSharingOpt, | ||
| parent ImmutableRef, | ||
| ) (_ MutableRef, rerr error) { | ||
| // TODO: support parent ref | ||
| if parent != nil { | ||
| return nil, fmt.Errorf("parent ref is not supported") | ||
| } | ||
| parentID := "" | ||
|
|
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| rec, err := func() (*cacheRecord, error) { | ||
| cm.mu.Lock() | ||
| defer cm.mu.Unlock() | ||
|
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| rec, err := cm.getRecord(ctx, id) | ||
| switch { | ||
| case err == nil: | ||
| return rec, nil | ||
|
|
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| case errors.Is(err, errNotFound): | ||
| // TODO: more optimal to Lease+Prepare outside of manager lock, could put in rec lock? | ||
|
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| l, err := cm.LeaseManager.Create(ctx, func(l *leases.Lease) error { | ||
| l.ID = id | ||
| l.Labels = map[string]string{ | ||
| "containerd.io/gc.flat": time.Now().UTC().Format(time.RFC3339Nano), | ||
| } | ||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create lease: %w", err) | ||
| } | ||
| defer func() { | ||
| if err != nil { | ||
| ctx := context.WithoutCancel(ctx) | ||
| if err := cm.LeaseManager.Delete(ctx, leases.Lease{ | ||
| ID: l.ID, | ||
| }); err != nil { | ||
| bklog.G(ctx).Errorf("failed to remove lease: %+v", err) | ||
| } | ||
| } | ||
| }() | ||
|
|
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| if err := cm.LeaseManager.AddResource(ctx, l, leases.Resource{ | ||
| ID: id, | ||
| Type: "snapshots/" + cm.volumeSnapshotter.Name(), | ||
| }); err != nil && !cerrdefs.IsAlreadyExists(err) { | ||
| return nil, fmt.Errorf("failed to add snapshot %s resource to lease: %w", id, err) | ||
| } | ||
|
|
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| if err := cm.volumeSnapshotter.Prepare(ctx, id, parentID); err != nil { | ||
| return nil, fmt.Errorf("failed to prepare volume: %w", err) | ||
| } | ||
|
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| md, _ := cm.getMetadata(id) | ||
|
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| rec = &cacheRecord{ | ||
| mu: &sync.Mutex{}, | ||
| mutable: true, | ||
| cm: cm, | ||
| refs: make(map[ref]struct{}), | ||
| cacheMetadata: md, | ||
| } | ||
|
|
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| opts := []RefOption{ | ||
| WithRecordType(client.UsageRecordTypeCacheMount), | ||
| WithDescription(fmt.Sprintf("cache mount %s", id)), // TODO: support human readable name? | ||
| CachePolicyRetain, | ||
| withSnapshotID(id), | ||
| } | ||
| if err := initializeMetadata(rec.cacheMetadata, rec.parentRefs, opts...); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| cm.records[id] = rec | ||
| return rec, nil | ||
|
|
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| default: | ||
| return nil, fmt.Errorf("failed to get volume cache record: %w", err) | ||
| } | ||
| }() | ||
|
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| releaseFunc, err := cm.volumeSnapshotter.Acquire(ctx, id, sharingMode) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to acquire volume: %w", err) | ||
| } | ||
| defer func() { | ||
| if rerr != nil { | ||
| rerr = errors.Join(rerr, releaseFunc()) | ||
| } | ||
| }() | ||
|
|
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| rec.mu.Lock() | ||
| defer rec.mu.Unlock() | ||
|
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| // TODO: note about how we are creating multiple mutable refs on a cacheRecord but it is safe to do so it turns out | ||
| ref := rec.mref(true, DescHandlers{}) | ||
| ref.releaseFunc = releaseFunc | ||
| return ref, nil | ||
| } | ||
|
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| func (cm *cacheManager) snapshotterFor(md *cacheMetadata) snapshot.MergeSnapshotter { | ||
| if md.GetRecordType() == client.UsageRecordTypeCacheMount { | ||
| return cm.volumeSnapshotter | ||
| } | ||
| return cm.Snapshotter | ||
| } |
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