1cdb010783
Updates content service to handle lock errors and return them to the client. The client remote handler has been updated to retry when a resource is locked until the resource is unlocked or the expected resource exists. Signed-off-by: Derek McGowan <derek@mcgstyle.net>
120 lines
3.1 KiB
Go
120 lines
3.1 KiB
Go
package content
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import (
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"context"
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"io"
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"sync"
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"time"
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"github.com/opencontainers/go-digest"
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"github.com/pkg/errors"
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)
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var (
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// ErrNotFound is returned when an item is not found.
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//
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// Use IsNotFound(err) to detect this condition.
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ErrNotFound = errors.New("content: not found")
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// ErrExists is returned when something exists when it may not be expected.
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//
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// Use IsExists(err) to detect this condition.
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ErrExists = errors.New("content: exists")
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// ErrLocked is returned when content is actively being uploaded, this
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// indicates that another process is attempting to upload the same content.
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//
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// Use IsLocked(err) to detect this condition.
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ErrLocked = errors.New("content: locked")
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bufPool = sync.Pool{
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New: func() interface{} {
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return make([]byte, 1<<20)
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},
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}
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)
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type Provider interface {
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Reader(ctx context.Context, dgst digest.Digest) (io.ReadCloser, error)
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}
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type Ingester interface {
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Writer(ctx context.Context, ref string, size int64, expected digest.Digest) (Writer, error)
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}
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// TODO(stevvooe): Consider a very different name for this struct. Info is way
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// to general. It also reads very weird in certain context, like pluralization.
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type Info struct {
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Digest digest.Digest
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Size int64
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CommittedAt time.Time
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}
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type Status struct {
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Ref string
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Offset int64
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Total int64
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Expected digest.Digest
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StartedAt time.Time
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UpdatedAt time.Time
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}
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// WalkFunc defines the callback for a blob walk.
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type WalkFunc func(Info) error
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// Manager provides methods for inspecting, listing and removing content.
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type Manager interface {
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// Info will return metadata about content available in the content store.
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//
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// If the content is not present, ErrNotFound will be returned.
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Info(ctx context.Context, dgst digest.Digest) (Info, error)
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// Walk will call fn for each item in the content store.
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Walk(ctx context.Context, fn WalkFunc) error
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// Delete removes the content from the store.
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Delete(ctx context.Context, dgst digest.Digest) error
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// Status returns the status of any active ingestions whose ref match the
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// provided regular expression. If empty, all active ingestions will be
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// returned.
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//
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// TODO(stevvooe): Status may be slighly out of place here. If this remains
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// here, we should remove Manager and just define these on store.
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Status(ctx context.Context, re string) ([]Status, error)
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// Abort completely cancels the ingest operation targeted by ref.
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//
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// TODO(stevvooe): Same consideration as above. This should really be
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// restricted to an ingest management interface.
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Abort(ctx context.Context, ref string) error
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}
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type Writer interface {
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io.WriteCloser
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Status() (Status, error)
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Digest() digest.Digest
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Commit(size int64, expected digest.Digest) error
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Truncate(size int64) error
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}
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// Store combines the methods of content-oriented interfaces into a set that
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// are commonly provided by complete implementations.
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type Store interface {
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Manager
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Ingester
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Provider
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}
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func IsNotFound(err error) bool {
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return errors.Cause(err) == ErrNotFound
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}
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func IsExists(err error) bool {
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return errors.Cause(err) == ErrExists
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}
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func IsLocked(err error) bool {
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return errors.Cause(err) == ErrLocked
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}
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