filestore

package
v0.19.4 Latest Latest
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 Go to latest Published: Aug 29, 2019 License: AGPL-3.0 Imports: 14 Imported by: 0

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Index

Constants

View Source 
const (
	// FormatV0 is the identifier for storage format v0, which also corresponds to an absence of
	// format version information.
	FormatV0 storage.FormatVersion = 0
	// FormatV1 is the identifier for storage format v1
	FormatV1 storage.FormatVersion = 1
)
View Source 
const (
	// MaxFormatVersionSupported is the highest supported storage format version for reading, and
	// the only supported storage format version for writing. If stored blobs claim a higher
	// storage format version than this, or a caller requests _writing_ a storage format version
	// which is not this, this software will not know how to perform the read or write and an error
	// will be returned.
	MaxFormatVersionSupported = FormatV1

	// MinFormatVersionSupported is the lowest supported storage format version for reading. If
	// stored blobs claim a lower storage format version than this, this software will not know how
	// to perform the read and an error will be returned.
	MinFormatVersionSupported = FormatV0
)

Variables

View Source 
var (
	// Error is the default filestore error class
	Error = errs.Class("filestore error")
)

Functions

This section is empty.

Types

type Dir 

type Dir struct {
	// contains filtered or unexported fields
}

Dir represents single folder for storing blobs

func NewDir 

func NewDir(path string) (*Dir, error)

NewDir returns folder for storing blobs

func (*Dir) Commit 

func (dir *Dir) Commit(ctx context.Context, file *os.File, ref storage.BlobRef, formatVersion storage.FormatVersion) (err error)

Commit commits the temporary file to permanent storage.

func (*Dir) CreateTemporaryFile 

func (dir *Dir) CreateTemporaryFile(ctx context.Context, prealloc int64) (_ *os.File, err error)

CreateTemporaryFile creates a preallocated temporary file in the temp directory prealloc preallocates file to make writing faster

func (*Dir) Delete 

func (dir *Dir) Delete(ctx context.Context, ref storage.BlobRef) (err error)

Delete deletes blobs with the specified ref (in all supported storage formats).

func (*Dir) DeleteTemporary 

func (dir *Dir) DeleteTemporary(ctx context.Context, file *os.File) (err error)

DeleteTemporary deletes a temporary file

func (*Dir) GarbageCollect 

func (dir *Dir) GarbageCollect(ctx context.Context) (err error)

GarbageCollect collects files that are pending deletion.

func (*Dir) Info 

func (dir *Dir) Info() (DiskInfo, error)

Info returns information about the current state of the dir

func (*Dir) ListNamespaces added in v0.18.0 

func (dir *Dir) ListNamespaces(ctx context.Context) (ids [][]byte, err error)

ListNamespaces finds all known namespace IDs in use in local storage. They are not guaranteed to contain any blobs.

func (*Dir) Open 

func (dir *Dir) Open(ctx context.Context, ref storage.BlobRef) (_ *os.File, _ storage.FormatVersion, err error)

Open opens the file with the specified ref. It may need to check in more than one location in order to find the blob, if it was stored with an older version of the storage node software. In cases where the storage format version of a blob is already known, OpenWithStorageFormat() will generally be a better choice.

func (*Dir) OpenWithStorageFormat added in v0.18.0 

func (dir *Dir) OpenWithStorageFormat(ctx context.Context, blobRef storage.BlobRef, formatVer storage.FormatVersion) (_ *os.File, err error)

OpenWithStorageFormat opens an already-located blob file with a known storage format version, which avoids the potential need to search through multiple storage formats to find the blob.

func (*Dir) Path 

func (dir *Dir) Path() string

Path returns the directory path

func (*Dir) Stat added in v0.18.0 

func (dir *Dir) Stat(ctx context.Context, ref storage.BlobRef) (_ storage.BlobInfo, err error)

Stat looks up disk metadata on the blob file. It may need to check in more than one location in order to find the blob, if it was stored with an older version of the storage node software. In cases where the storage format version of a blob is already known, StatWithStorageFormat() will generally be a better choice.

func (*Dir) StatWithStorageFormat added in v0.18.0 

func (dir *Dir) StatWithStorageFormat(ctx context.Context, ref storage.BlobRef, formatVer storage.FormatVersion) (_ storage.BlobInfo, err error)

StatWithStorageFormat looks up disk metadata on the blob file with the given storage format version. This avoids the need for checking for the file in multiple different storage format types.

func (*Dir) WalkNamespace added in v0.18.0 

func (dir *Dir) WalkNamespace(ctx context.Context, namespace []byte, walkFunc func(storage.BlobInfo) error) (err error)

WalkNamespace executes walkFunc for each locally stored blob, stored with storage format V1 or greater, in the given namespace. If walkFunc returns a non-nil error, WalkNamespace will stop iterating and return the error immediately. The ctx parameter is intended specifically to allow canceling iteration early.

type DiskInfo 

type DiskInfo struct {
	ID             string
	AvailableSpace int64
}

DiskInfo contains statistics about this dir

type Store 

type Store struct {
	// contains filtered or unexported fields
}

Store implements a blob store

func New 

func New(log *zap.Logger, dir *Dir) *Store

New creates a new disk blob store in the specified directory

func NewAt 

func NewAt(log *zap.Logger, path string) (*Store, error)

NewAt creates a new disk blob store in the specified directory

func (*Store) Close 

func (store *Store) Close() error

Close closes the store.

func (*Store) Create 

func (store *Store) Create(ctx context.Context, ref storage.BlobRef, size int64) (_ storage.BlobWriter, err error)

Create creates a new blob that can be written optionally takes a size argument for performance improvements, -1 is unknown size

func (*Store) Delete 

func (store *Store) Delete(ctx context.Context, ref storage.BlobRef) (err error)

Delete deletes blobs with the specified ref

func (*Store) FreeSpace 

func (store *Store) FreeSpace() (int64, error)

FreeSpace returns how much space left in underlying directory

func (*Store) GarbageCollect 

func (store *Store) GarbageCollect(ctx context.Context) (err error)

GarbageCollect tries to delete any files that haven't yet been deleted

func (*Store) ListNamespaces added in v0.18.0 

func (store *Store) ListNamespaces(ctx context.Context) (ids [][]byte, err error)

ListNamespaces finds all known namespace IDs in use in local storage. They are not guaranteed to contain any blobs.

func (*Store) Open 

func (store *Store) Open(ctx context.Context, ref storage.BlobRef) (_ storage.BlobReader, err error)

Open loads blob with the specified hash

func (*Store) OpenWithStorageFormat added in v0.18.0 

func (store *Store) OpenWithStorageFormat(ctx context.Context, blobRef storage.BlobRef, formatVer storage.FormatVersion) (_ storage.BlobReader, err error)

OpenWithStorageFormat loads the already-located blob, avoiding the potential need to check multiple storage formats to find the blob.

func (*Store) SpaceUsed added in v0.18.0 

func (store *Store) SpaceUsed(ctx context.Context) (space int64, err error)

SpaceUsed adds up the space used in all namespaces for blob storage

func (*Store) SpaceUsedInNamespace added in v0.18.0 

func (store *Store) SpaceUsedInNamespace(ctx context.Context, namespace []byte) (int64, error)

SpaceUsedInNamespace adds up how much is used in the given namespace for blob storage

func (*Store) Stat added in v0.18.0 

func (store *Store) Stat(ctx context.Context, ref storage.BlobRef) (_ storage.BlobInfo, err error)

Stat looks up disk metadata on the blob file

func (*Store) StatWithStorageFormat added in v0.18.0 

func (store *Store) StatWithStorageFormat(ctx context.Context, ref storage.BlobRef, formatVer storage.FormatVersion) (_ storage.BlobInfo, err error)

StatWithStorageFormat looks up disk metadata on the blob file with the given storage format version

func (*Store) TestCreateV0 added in v0.18.0 

func (store *Store) TestCreateV0(ctx context.Context, ref storage.BlobRef) (_ storage.BlobWriter, err error)

TestCreateV0 creates a new V0 blob that can be written. This is only appropriate in test situations.

func (*Store) WalkNamespace added in v0.18.0 

func (store *Store) WalkNamespace(ctx context.Context, namespace []byte, walkFunc func(storage.BlobInfo) error) (err error)

WalkNamespace executes walkFunc for each locally stored blob in the given namespace. If walkFunc returns a non-nil error, WalkNamespace will stop iterating and return the error immediately. The ctx parameter is intended specifically to allow canceling iteration early.

type StoreForTest added in v0.18.0 

type StoreForTest struct {
	*Store
}

StoreForTest is a wrapper for Store that also allows writing new V0 blobs (in order to test situations involving those)

Source Files

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