storage

Documentation

Overview

Package storage implements storage backends for package torrent.

Index

• func CreateNativeZeroLengthFile(name string) error
• func NewFileWithCompletion(baseDir string, completion PieceCompletion) *fileClientImpl
• func NewMMapWithCompletion(baseDir string, completion PieceCompletion) *mmapClientImpl
• func NewSqlitePieceCompletion(dir string) (ret *sqlitePieceCompletion, err error)
• func ToSafeFilePath(fileInfoComponents ...string) (string, error)
• type Client
  • func NewClient(cl ClientImpl) *Client
  • func (cl Client) OpenTorrent(info *metainfo.Info, infoHash metainfo.Hash) (*Torrent, error)
• type ClientImpl
  • func NewFileByInfoHash(baseDir string) ClientImpl
  • func NewFileWithCustomPathMaker(baseDir string, ...) ClientImpl
  • func NewResourcePieces(p PieceProvider) ClientImpl
• type ClientImplCloser
  • func NewBoltDB(filePath string) ClientImplCloser
  • func NewFile(baseDir string) ClientImplCloser
  • func NewMMap(baseDir string) ClientImplCloser
• type Completion
• type ConsecutiveChunkWriter
• type Piece
  • func (p Piece) ReadAt(b []byte, off int64) (n int, err error)
  • func (p Piece) WriteAt(b []byte, off int64) (n int, err error)
  • func (p Piece) WriteTo(w io.Writer) (int64, error)
• type PieceCompletion
  • func NewBoltPieceCompletion(dir string) (ret PieceCompletion, err error)
  • func NewMapPieceCompletion() PieceCompletion
• type PieceCompletionGetSetter
• type PieceImpl
• type PieceProvider
• type Torrent
  • func (t Torrent) Piece(p metainfo.Piece) Piece
• type TorrentImpl

Functions

func CreateNativeZeroLengthFile

func CreateNativeZeroLengthFile(name string) error

A helper to create zero-length files which won't appear for file-orientated storage since no writes will ever occur to them (no torrent data is associated with a zero-length file). The caller should make sure the file name provided is safe/sanitized.

func NewFileWithCompletion

func NewFileWithCompletion(baseDir string, completion PieceCompletion) *fileClientImpl

func NewMMapWithCompletion

func NewMMapWithCompletion(baseDir string, completion PieceCompletion) *mmapClientImpl

func NewSqlitePieceCompletion

func NewSqlitePieceCompletion(dir string) (ret *sqlitePieceCompletion, err error)

func ToSafeFilePath

func ToSafeFilePath(fileInfoComponents ...string) (string, error)

Combines file info path components, ensuring the result won't escape into parent directories.

Types

type Client

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

func NewClient

func NewClient(cl ClientImpl) *Client

func (Client) OpenTorrent

func (cl Client) OpenTorrent(info *metainfo.Info, infoHash metainfo.Hash) (*Torrent, error)

type ClientImpl

type ClientImpl interface {
	OpenTorrent(info *metainfo.Info, infoHash metainfo.Hash) (TorrentImpl, error)
}

Represents data storage for an unspecified torrent.

func NewFileByInfoHash

func NewFileByInfoHash(baseDir string) ClientImpl

File storage with data partitioned by infohash.

func NewFileWithCustomPathMaker

func NewFileWithCustomPathMaker(baseDir string, pathMaker func(baseDir string, info *metainfo.Info, infoHash metainfo.Hash) string) ClientImpl

Allows passing a function to determine the path for storing torrent data. The function is responsible for sanitizing the info if it uses some part of it (for example sanitizing info.Name).

func NewResourcePieces

func NewResourcePieces(p PieceProvider) ClientImpl

type ClientImplCloser

type ClientImplCloser interface {
	ClientImpl
	Close() error
}

func NewBoltDB

func NewBoltDB(filePath string) ClientImplCloser

func NewFile

func NewFile(baseDir string) ClientImplCloser

All Torrent data stored in this baseDir

func NewMMap

func NewMMap(baseDir string) ClientImplCloser

type Completion

type Completion struct {
	Complete bool
	Ok       bool
}

type ConsecutiveChunkWriter

type ConsecutiveChunkWriter interface {
	WriteConsecutiveChunks(prefix string, _ io.Writer) (int64, error)
}

type Piece

type Piece struct {
	PieceImpl
	// contains filtered or unexported fields
}

func (Piece) ReadAt

func (p Piece) ReadAt(b []byte, off int64) (n int, err error)

func (Piece) WriteAt

func (p Piece) WriteAt(b []byte, off int64) (n int, err error)

func (Piece) WriteTo

func (p Piece) WriteTo(w io.Writer) (int64, error)

Why do we have this wrapper? Well PieceImpl doesn't implement io.Reader, so we can't let io.Copy and friends check for io.WriterTo and fallback for us since they expect an io.Reader.

type PieceCompletion

type PieceCompletion interface {
	PieceCompletionGetSetter
	Close() error
}

Implementations track the completion of pieces. It must be concurrent-safe.

func NewBoltPieceCompletion

func NewBoltPieceCompletion(dir string) (ret PieceCompletion, err error)

func NewMapPieceCompletion

func NewMapPieceCompletion() PieceCompletion

type PieceCompletionGetSetter

type PieceCompletionGetSetter interface {
	Get(metainfo.PieceKey) (Completion, error)
	Set(_ metainfo.PieceKey, complete bool) error
}

type PieceImpl

type PieceImpl interface {
	// These interfaces are not as strict as normally required. They can
	// assume that the parameters are appropriate for the dimensions of the
	// piece.
	io.ReaderAt
	io.WriterAt
	// Called when the client believes the piece data will pass a hash check.
	// The storage can move or mark the piece data as read-only as it sees
	// fit.
	MarkComplete() error
	MarkNotComplete() error
	// Returns true if the piece is complete.
	Completion() Completion
}

Interacts with torrent piece data. Optional interfaces to implement include io.WriterTo, such as when a piece supports a more efficient way to write out incomplete chunks

type PieceProvider

type PieceProvider interface {
	resource.Provider
}

type Torrent

type Torrent struct {
	TorrentImpl
}

func (Torrent) Piece

func (t Torrent) Piece(p metainfo.Piece) Piece

type TorrentImpl

type TorrentImpl interface {
	Piece(metainfo.Piece) PieceImpl
	Close() error
}

Data storage bound to a torrent.