iface

Documentation

Overview

Package iface defines IPFS Core API which is a set of interfaces used to interact with IPFS nodes.

Index

• Variables
• type BadPinNode
• type BlockAPI
• type BlockStat
• type CoreAPI
• type DagAPI
• type IpnsEntry
• type Key
• type KeyAPI
• type NameAPI
• type ObjectAPI
• type ObjectStat
• type Path
  • func ParsePath(p string) (Path, error)
• type Pin
• type PinAPI
• type PinStatus
• type Reader
• type ResolvedPath
  • func IpfsPath(c *cid.Cid) ResolvedPath
  • func IpldPath(c *cid.Cid) ResolvedPath
  • func NewResolvedPath(ipath ipfspath.Path, c *cid.Cid, root *cid.Cid, remainder string) ResolvedPath
• type UnixfsAPI

Variables

var (
	ErrIsDir   = errors.New("object is a directory")
	ErrOffline = errors.New("can't resolve, ipfs node is offline")
)

Types

type BadPinNode

type BadPinNode interface {
	// Path is the path of the node
	Path() ResolvedPath

	// Err is the reason why the node has been marked as bad
	Err() error
}

BadPinNode is a node that has been marked as bad by Pin.Verify

type BlockAPI

type BlockAPI interface {
	// Put imports raw block data, hashing it using specified settings.
	Put(context.Context, io.Reader, ...options.BlockPutOption) (ResolvedPath, error)

	// Get attempts to resolve the path and return a reader for data in the block
	Get(context.Context, Path) (io.Reader, error)

	// Rm removes the block specified by the path from local blockstore.
	// By default an error will be returned if the block can't be found locally.
	//
	// NOTE: If the specified block is pinned it won't be removed and no error
	// will be returned
	Rm(context.Context, Path, ...options.BlockRmOption) error

	// Stat returns information on
	Stat(context.Context, Path) (BlockStat, error)
}

BlockAPI specifies the interface to the block layer

type BlockStat

type BlockStat interface {
	// Size is the size of a block
	Size() int

	// Path returns path to the block
	Path() ResolvedPath
}

BlockStat contains information about a block

type CoreAPI

type CoreAPI interface {
	// Unixfs returns an implementation of Unixfs API
	Unixfs() UnixfsAPI

	// Block returns an implementation of Block API
	Block() BlockAPI

	// Dag returns an implementation of Dag API
	Dag() DagAPI

	// Name returns an implementation of Name API
	Name() NameAPI

	// Key returns an implementation of Key API
	Key() KeyAPI

	// Pin returns an implementation of Pin API
	Pin() PinAPI

	// ObjectAPI returns an implementation of Object API
	Object() ObjectAPI

	// ResolvePath resolves the path using Unixfs resolver
	ResolvePath(context.Context, Path) (ResolvedPath, error)

	// ResolveNode resolves the path (if not resolved already) using Unixfs
	// resolver, gets and returns the resolved Node
	ResolveNode(context.Context, Path) (ipld.Node, error)
}

CoreAPI defines an unified interface to IPFS for Go programs

type DagAPI

type DagAPI interface {
	// Put inserts data using specified format and input encoding.
	// Unless used with WithCodec or WithHash, the defaults "dag-cbor" and
	// "sha256" are used.
	Put(ctx context.Context, src io.Reader, opts ...options.DagPutOption) (ResolvedPath, error)

	// Get attempts to resolve and get the node specified by the path
	Get(ctx context.Context, path Path) (ipld.Node, error)

	// Tree returns list of paths within a node specified by the path.
	Tree(ctx context.Context, path Path, opts ...options.DagTreeOption) ([]Path, error)
}

DagAPI specifies the interface to IPLD

type IpnsEntry

type IpnsEntry interface {
	// Name returns IpnsEntry name
	Name() string
	// Value returns IpnsEntry value
	Value() Path
}

IpnsEntry specifies the interface to IpnsEntries

type Key

type Key interface {
	// Key returns key name
	Name() string
	// Path returns key path
	Path() Path
}

Key specifies the interface to Keys in KeyAPI Keystore

type KeyAPI

type KeyAPI interface {
	// Generate generates new key, stores it in the keystore under the specified
	// name and returns a base58 encoded multihash of it's public key
	Generate(ctx context.Context, name string, opts ...options.KeyGenerateOption) (Key, error)

	// Rename renames oldName key to newName. Returns the key and whether another
	// key was overwritten, or an error
	Rename(ctx context.Context, oldName string, newName string, opts ...options.KeyRenameOption) (Key, bool, error)

	// List lists keys stored in keystore
	List(ctx context.Context) ([]Key, error)

	// Remove removes keys from keystore. Returns ipns path of the removed key
	Remove(ctx context.Context, name string) (Path, error)
}

KeyAPI specifies the interface to Keystore

type NameAPI

type NameAPI interface {
	// Publish announces new IPNS name
	Publish(ctx context.Context, path Path, opts ...options.NamePublishOption) (IpnsEntry, error)

	// Resolve attempts to resolve the newest version of the specified name
	Resolve(ctx context.Context, name string, opts ...options.NameResolveOption) (Path, error)
}

NameAPI specifies the interface to IPNS.

IPNS is a PKI namespace, where names are the hashes of public keys, and the private key enables publishing new (signed) values. In both publish and resolve, the default name used is the node's own PeerID, which is the hash of its public key.

You can use .Key API to list and generate more names and their respective keys.

type ObjectAPI

type ObjectAPI interface {
	// New creates new, empty (by default) dag-node.
	New(context.Context, ...options.ObjectNewOption) (ipld.Node, error)

	// Put imports the data into merkledag
	Put(context.Context, io.Reader, ...options.ObjectPutOption) (ResolvedPath, error)

	// Get returns the node for the path
	Get(context.Context, Path) (ipld.Node, error)

	// Data returns reader for data of the node
	Data(context.Context, Path) (io.Reader, error)

	// Links returns lint or links the node contains
	Links(context.Context, Path) ([]*ipld.Link, error)

	// Stat returns information about the node
	Stat(context.Context, Path) (*ObjectStat, error)

	// AddLink adds a link under the specified path. child path can point to a
	// subdirectory within the patent which must be present (can be overridden
	// with WithCreate option).
	AddLink(ctx context.Context, base Path, name string, child Path, opts ...options.ObjectAddLinkOption) (ResolvedPath, error)

	// RmLink removes a link from the node
	RmLink(ctx context.Context, base Path, link string) (ResolvedPath, error)

	// AppendData appends data to the node
	AppendData(context.Context, Path, io.Reader) (ResolvedPath, error)

	// SetData sets the data contained in the node
	SetData(context.Context, Path, io.Reader) (ResolvedPath, error)
}

ObjectAPI specifies the interface to MerkleDAG and contains useful utilities for manipulating MerkleDAG data structures.

type ObjectStat

type ObjectStat struct {
	// Cid is the CID of the node
	Cid *cid.Cid

	// NumLinks is number of links the node contains
	NumLinks int

	// BlockSize is size of the raw serialized node
	BlockSize int

	// LinksSize is size of the links block section
	LinksSize int

	// DataSize is the size of data block section
	DataSize int

	// CumulativeSize is size of the tree (BlockSize + link sizes)
	CumulativeSize int
}

ObjectStat provides information about dag nodes

type Path

type Path interface {
	// String returns the path as a string.
	String() string

	// Namespace returns the first component of the path.
	//
	// For example path "/ipfs/QmHash", calling Namespace() will return "ipfs"
	Namespace() string

	// Mutable returns false if the data pointed to by this path in guaranteed
	// to not change.
	//
	// Note that resolved mutable path can be immutable.
	Mutable() bool
}

Path is a generic wrapper for paths used in the API. A path can be resolved to a CID using one of Resolve functions in the API.

Paths must be prefixed with a valid prefix:

* /ipfs - Immutable unixfs path (files) * /ipld - Immutable ipld path (data) * /ipns - Mutable names. Usually resolves to one of the immutable paths TODO: /local (MFS)

func ParsePath

func ParsePath(p string) (Path, error)

ParsePath parses string path to a Path

type Pin

type Pin interface {
	// Path to the pinned object
	Path() ResolvedPath

	// Type of the pin
	Type() string
}

Pin holds information about pinned resource

type PinAPI

type PinAPI interface {
	// Add creates new pin, be default recursive - pinning the whole referenced
	// tree
	Add(context.Context, Path, ...options.PinAddOption) error

	// Ls returns list of pinned objects on this node
	Ls(context.Context, ...options.PinLsOption) ([]Pin, error)

	// Rm removes pin for object specified by the path
	Rm(context.Context, Path) error

	// Update changes one pin to another, skipping checks for matching paths in
	// the old tree
	Update(ctx context.Context, from Path, to Path, opts ...options.PinUpdateOption) error

	// Verify verifies the integrity of pinned objects
	Verify(context.Context) (<-chan PinStatus, error)
}

PinAPI specifies the interface to pining

type PinStatus

type PinStatus interface {
	// Ok indicates whether the pin has been verified to be correct
	Ok() bool

	// BadNodes returns any bad (usually missing) nodes from the pin
	BadNodes() []BadPinNode
}

PinStatus holds information about pin health

type Reader

type Reader interface {
	io.ReadSeeker
	io.Closer
}

type ResolvedPath

type ResolvedPath interface {
	// Cid returns the CID of the node referenced by the path. Remainder of the
	// path is guaranteed to be within the node.
	//
	// Examples:
	// If you have 3 linked objects: QmRoot -> A -> B:
	//
	// cidB := {"foo": {"bar": 42 }}
	// cidA := {"B": {"/": cidB }}
	// cidRoot := {"A": {"/": cidA }}
	//
	// And resolve paths:
	// * "/ipfs/${cidRoot}"
	//   * Calling Cid() will return `cidRoot`
	//   * Calling Root() will return `cidRoot`
	//   * Calling Remainder() will return “
	//
	// * "/ipfs/${cidRoot}/A"
	//   * Calling Cid() will return `cidA`
	//   * Calling Root() will return `cidRoot`
	//   * Calling Remainder() will return “
	//
	// * "/ipfs/${cidRoot}/A/B/foo"
	//   * Calling Cid() will return `cidB`
	//   * Calling Root() will return `cidRoot`
	//   * Calling Remainder() will return `foo`
	//
	// * "/ipfs/${cidRoot}/A/B/foo/bar"
	//   * Calling Cid() will return `cidB`
	//   * Calling Root() will return `cidRoot`
	//   * Calling Remainder() will return `foo/bar`
	Cid() *cid.Cid

	// Root returns the CID of the root object of the path
	//
	// Example:
	// If you have 3 linked objects: QmRoot -> A -> B, and resolve path
	// "/ipfs/QmRoot/A/B", the Root method will return the CID of object QmRoot
	//
	// For more examples see the documentation of Cid() method
	Root() *cid.Cid

	// Remainder returns unresolved part of the path
	//
	// Example:
	// If you have 2 linked objects: QmRoot -> A, where A is a CBOR node
	// containing the following data:
	//
	// {"foo": {"bar": 42 }}
	//
	// When resolving "/ipld/QmRoot/A/foo/bar", Remainder will return "foo/bar"
	//
	// For more examples see the documentation of Cid() method
	Remainder() string

	Path
}

ResolvedPath is a path which was resolved to the last resolvable node

func IpfsPath

func IpfsPath(c *cid.Cid) ResolvedPath

IpfsPath creates new /ipfs path from the provided CID

func IpldPath

func IpldPath(c *cid.Cid) ResolvedPath

IpldPath creates new /ipld path from the provided CID

func NewResolvedPath

func NewResolvedPath(ipath ipfspath.Path, c *cid.Cid, root *cid.Cid, remainder string) ResolvedPath

NewResolvedPath creates new ResolvedPath. This function performs no checks and is intended to be used by resolver implementations. Incorrect inputs may cause panics. Handle with care.

type UnixfsAPI

type UnixfsAPI interface {
	// Add imports the data from the reader into merkledag file
	Add(context.Context, io.Reader) (ResolvedPath, error)

	// Cat returns a reader for the file
	Cat(context.Context, Path) (Reader, error)

	// Ls returns the list of links in a directory
	Ls(context.Context, Path) ([]*ipld.Link, error)
}

UnixfsAPI is the basic interface to immutable files in IPFS