mfs

package
Version: v0.4.17 Latest Latest
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Published: Jul 27, 2018 License: MIT Imports: 19 Imported by: 0

Documentation

Overview

package mfs implements an in memory model of a mutable IPFS filesystem.

It consists of four main structs: 1) The Filesystem

The filesystem serves as a container and entry point for various mfs filesystems

2) Root

Root represents an individual filesystem mounted within the mfs system as a whole

3) Directories 4) Files

Index

Constants

View Source
const (
	OpenReadOnly = iota
	OpenWriteOnly
	OpenReadWrite
)

Variables

View Source
var ErrDirExists = errors.New("directory already has entry by that name")
View Source
var ErrInvalidChild = errors.New("invalid child node")
View Source
var ErrIsDirectory = errors.New("error: is a directory")
View Source
var ErrNotExist = errors.New("no such rootfs")
View Source
var ErrNotYetImplemented = errors.New("not yet implemented")

Functions

func FlushPath

func FlushPath(rt *Root, pth string) error

func Mkdir

func Mkdir(r *Root, pth string, opts MkdirOpts) error

Mkdir creates a directory at 'path' under the directory 'd', creating intermediary directories as needed if 'mkparents' is set to true

func Mv

func Mv(r *Root, src, dst string) error

Mv moves the file or directory at 'src' to 'dst'

func PutNode

func PutNode(r *Root, path string, nd ipld.Node) error

PutNode inserts 'nd' at 'path' in the given mfs

Types

type Directory

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

func NewDirectory

func NewDirectory(ctx context.Context, name string, node ipld.Node, parent childCloser, dserv ipld.DAGService) (*Directory, error)

NewDirectory constructs a new MFS directory.

You probably don't want to call this directly. Instead, construct a new root using NewRoot.

func (*Directory) AddChild

func (d *Directory) AddChild(name string, nd ipld.Node) error

AddChild adds the node 'nd' under this directory giving it the name 'name'

func (*Directory) AddUnixFSChild added in v0.4.17

func (d *Directory) AddUnixFSChild(name string, node ipld.Node) error

AddUnixFSChild adds a child to the inner UnixFS directory and transitions to a HAMT implementation if needed.

func (*Directory) Child

func (d *Directory) Child(name string) (FSNode, error)

Child returns the child of this directory by the given name

func (*Directory) Flush

func (d *Directory) Flush() error

func (*Directory) ForEachEntry added in v0.4.8

func (d *Directory) ForEachEntry(ctx context.Context, f func(NodeListing) error) error

func (*Directory) GetNode

func (d *Directory) GetNode() (ipld.Node, error)

func (*Directory) GetPrefix added in v0.4.12

func (d *Directory) GetPrefix() *cid.Prefix

GetPrefix gets the CID prefix of the root node

func (*Directory) List

func (d *Directory) List(ctx context.Context) ([]NodeListing, error)

func (*Directory) ListNames

func (d *Directory) ListNames(ctx context.Context) ([]string, error)

func (*Directory) Mkdir

func (d *Directory) Mkdir(name string) (*Directory, error)

func (*Directory) Path

func (d *Directory) Path() string

func (*Directory) SetPrefix added in v0.4.9

func (d *Directory) SetPrefix(prefix *cid.Prefix)

SetPrefix sets the CID prefix

func (*Directory) Type

func (d *Directory) Type() NodeType

func (*Directory) Uncache added in v0.4.3

func (d *Directory) Uncache(name string)
func (d *Directory) Unlink(name string) error

type FSNode

type FSNode interface {
	GetNode() (ipld.Node, error)
	Flush() error
	Type() NodeType
}

FSNode represents any node (directory, root, or file) in the mfs filesystem.

func DirLookup

func DirLookup(d *Directory, pth string) (FSNode, error)

DirLookup will look up a file or directory at the given path under the directory 'd'

func Lookup

func Lookup(r *Root, path string) (FSNode, error)

Lookup extracts the root directory and performs a lookup under it. TODO: Now that the root is always a directory, can this function be collapsed with `DirLookup`? Or at least be made a method of `Root`?

type File

type File struct {
	RawLeaves bool
	// contains filtered or unexported fields
}

func NewFile

func NewFile(name string, node ipld.Node, parent childCloser, dserv ipld.DAGService) (*File, error)

NewFile returns a NewFile object with the given parameters. If the Cid version is non-zero RawLeaves will be enabled.

func (*File) Flush

func (fi *File) Flush() error

func (*File) GetNode

func (fi *File) GetNode() (ipld.Node, error)

GetNode returns the dag node associated with this file

func (*File) Open

func (fi *File) Open(flags int, sync bool) (FileDescriptor, error)

func (*File) Size

func (fi *File) Size() (int64, error)

Size returns the size of this file

func (*File) Sync

func (fi *File) Sync() error

func (*File) Type

func (fi *File) Type() NodeType

Type returns the type FSNode this is

type FileDescriptor

type FileDescriptor interface {
	io.Reader
	CtxReadFull(context.Context, []byte) (int, error)

	io.Writer
	io.WriterAt

	io.Closer
	io.Seeker

	Truncate(int64) error
	Size() (int64, error)
	Sync() error
	Flush() error
}

type MkdirOpts added in v0.4.12

type MkdirOpts struct {
	Mkparents bool
	Flush     bool
	Prefix    *cid.Prefix
}

MkdirOpts is used by Mkdir

type NodeListing

type NodeListing struct {
	Name string
	Type int
	Size int64
	Hash string
}

type NodeType

type NodeType int
const (
	TFile NodeType = iota
	TDir
)

type PubFunc

type PubFunc func(context.Context, *cid.Cid) error

PubFunc is the function used by the `publish()` method.

type Republisher

type Republisher struct {
	TimeoutLong  time.Duration
	TimeoutShort time.Duration
	Publish      chan struct{}
	// contains filtered or unexported fields
}

Republisher manages when to publish a given entry.

func NewRepublisher

func NewRepublisher(ctx context.Context, pf PubFunc, tshort, tlong time.Duration) *Republisher

NewRepublisher creates a new Republisher object to republish the given root using the given short and long time intervals.

func (*Republisher) Close

func (p *Republisher) Close() error

func (*Republisher) Run

func (np *Republisher) Run()

Run is the main republisher loop.

func (*Republisher) Update

func (np *Republisher) Update(c *cid.Cid)

Touch signals that an update has occurred since the last publish. Multiple consecutive touches may extend the time period before the next Publish occurs in order to more efficiently batch updates.

func (*Republisher) WaitPub

func (p *Republisher) WaitPub()

WaitPub Returns immediately if `lastpub` value is consistent with the current value `val`, else will block until `val` has been published.

type Root

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

Root represents the root of a filesystem tree.

func NewRoot

func NewRoot(parent context.Context, ds ipld.DAGService, node *dag.ProtoNode, pf PubFunc) (*Root, error)

NewRoot creates a new Root and starts up a republisher routine for it.

func (*Root) Close

func (kr *Root) Close() error

func (*Root) Flush

func (kr *Root) Flush() error

Flush signals that an update has occurred since the last publish, and updates the Root republisher.

func (*Root) FlushMemFree added in v0.4.14

func (kr *Root) FlushMemFree(ctx context.Context) error

FlushMemFree flushes the root directory and then uncaches all of its links. This has the effect of clearing out potentially stale references and allows them to be garbage collected. CAUTION: Take care not to ever call this while holding a reference to any child directories. Those directories will be bad references and using them may have unintended racy side effects. A better implemented mfs system (one that does smarter internal caching and refcounting) shouldnt need this method.

func (*Root) GetDirectory added in v0.4.17

func (kr *Root) GetDirectory() *Directory

GetDirectory returns the root directory.

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