forked from ETHFSx/interface-go-ipfs-core
/
unixfs.go
308 lines (260 loc) · 7.28 KB
/
unixfs.go
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package options
import (
"errors"
"fmt"
cid "github.com/ipfs/go-cid"
dag "github.com/ipfs/go-merkledag"
"github.com/libp2p/go-libp2p-core/peer"
mh "github.com/multiformats/go-multihash"
)
type Layout int
const (
BalancedLayout Layout = iota
TrickleLayout
)
type UnixfsAddSettings struct {
CidVersion int
MhType uint64
Inline bool
InlineLimit int
RawLeaves bool
RawLeavesSet bool
Chunker string
Layout Layout
Pin bool
OnlyHash bool
FsCache bool
NoCopy bool
Events chan<- interface{}
Silent bool
Progress bool
EncryptPwd string
Identity peer.ID
}
type UnixfsLsSettings struct {
ResolveChildren bool
}
type UnixfsAddOption func(*UnixfsAddSettings) error
type UnixfsLsOption func(*UnixfsLsSettings) error
func UnixfsAddOptions(opts ...UnixfsAddOption) (*UnixfsAddSettings, cid.Prefix, error) {
options := &UnixfsAddSettings{
CidVersion: -1,
MhType: mh.SHA2_256,
Inline: false,
InlineLimit: 32,
RawLeaves: false,
RawLeavesSet: false,
Chunker: "size-262144",
Layout: BalancedLayout,
Pin: false,
OnlyHash: false,
FsCache: false,
NoCopy: false,
Events: nil,
Silent: false,
Progress: false,
EncryptPwd: "",
}
for _, opt := range opts {
err := opt(options)
if err != nil {
return nil, cid.Prefix{}, err
}
}
// nocopy -> rawblocks
if options.NoCopy && !options.RawLeaves {
// fixed?
if options.RawLeavesSet {
return nil, cid.Prefix{}, fmt.Errorf("nocopy option requires '--raw-leaves' to be enabled as well")
}
// No, satisfy mandatory constraint.
options.RawLeaves = true
}
// (hash != "sha2-256") -> CIDv1
if options.MhType != mh.SHA2_256 {
switch options.CidVersion {
case 0:
return nil, cid.Prefix{}, errors.New("CIDv0 only supports sha2-256")
case 1, -1:
options.CidVersion = 1
default:
return nil, cid.Prefix{}, fmt.Errorf("unknown CID version: %d", options.CidVersion)
}
} else {
if options.CidVersion < 0 {
// Default to CIDv0
options.CidVersion = 0
}
}
// cidV1 -> raw blocks (by default)
if options.CidVersion > 0 && !options.RawLeavesSet {
options.RawLeaves = true
}
prefix, err := dag.PrefixForCidVersion(options.CidVersion)
if err != nil {
return nil, cid.Prefix{}, err
}
prefix.MhType = options.MhType
prefix.MhLength = -1
return options, prefix, nil
}
func UnixfsLsOptions(opts ...UnixfsLsOption) (*UnixfsLsSettings, error) {
options := &UnixfsLsSettings{
ResolveChildren: true,
}
for _, opt := range opts {
err := opt(options)
if err != nil {
return nil, err
}
}
return options, nil
}
type unixfsOpts struct{}
var Unixfs unixfsOpts
// CidVersion specifies which CID version to use. Defaults to 0 unless an option
// that depends on CIDv1 is passed.
func (unixfsOpts) CidVersion(version int) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.CidVersion = version
return nil
}
}
// Hash function to use. Implies CIDv1 if not set to sha2-256 (default).
//
// Table of functions is declared in https://github.com/multiformats/go-multihash/blob/master/multihash.go
func (unixfsOpts) Hash(mhtype uint64) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.MhType = mhtype
return nil
}
}
// RawLeaves specifies whether to use raw blocks for leaves (data nodes with no
// links) instead of wrapping them with unixfs structures.
func (unixfsOpts) RawLeaves(enable bool) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.RawLeaves = enable
settings.RawLeavesSet = true
return nil
}
}
// Inline tells the adder to inline small blocks into CIDs
func (unixfsOpts) Inline(enable bool) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.Inline = enable
return nil
}
}
// InlineLimit sets the amount of bytes below which blocks will be encoded
// directly into CID instead of being stored and addressed by it's hash.
// Specifying this option won't enable block inlining. For that use `Inline`
// option. Default: 32 bytes
//
// Note that while there is no hard limit on the number of bytes, it should be
// kept at a reasonably low value, such as 64; implementations may choose to
// reject anything larger.
func (unixfsOpts) InlineLimit(limit int) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.InlineLimit = limit
return nil
}
}
// Chunker specifies settings for the chunking algorithm to use.
//
// Default: size-262144, formats:
// size-[bytes] - Simple chunker splitting data into blocks of n bytes
// rabin-[min]-[avg]-[max] - Rabin chunker
func (unixfsOpts) Chunker(chunker string) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.Chunker = chunker
return nil
}
}
// Layout tells the adder how to balance data between leaves.
// options.BalancedLayout is the default, it's optimized for static seekable
// files.
// options.TrickleLayout is optimized for streaming data,
func (unixfsOpts) Layout(layout Layout) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.Layout = layout
return nil
}
}
// Pin tells the adder to pin the file root recursively after adding
func (unixfsOpts) Pin(pin bool) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.Pin = pin
return nil
}
}
// HashOnly will make the adder calculate data hash without storing it in the
// blockstore or announcing it to the network
func (unixfsOpts) HashOnly(hashOnly bool) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.OnlyHash = hashOnly
return nil
}
}
// Events specifies channel which will be used to report events about ongoing
// Add operation.
//
// Note that if this channel blocks it may slowdown the adder
func (unixfsOpts) Events(sink chan<- interface{}) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.Events = sink
return nil
}
}
// Silent reduces event output
func (unixfsOpts) Silent(silent bool) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.Silent = silent
return nil
}
}
// Progress tells the adder whether to enable progress events
func (unixfsOpts) Progress(enable bool) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.Progress = enable
return nil
}
}
// FsCache tells the adder to check the filestore for pre-existing blocks
//
// Experimental
func (unixfsOpts) FsCache(enable bool) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.FsCache = enable
return nil
}
}
// NoCopy tells the adder to add the files using filestore. Implies RawLeaves.
//
// Experimental
func (unixfsOpts) Nocopy(enable bool) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.NoCopy = enable
return nil
}
}
func (unixfsOpts) ResolveChildren(resolve bool) UnixfsLsOption {
return func(settings *UnixfsLsSettings) error {
settings.ResolveChildren = resolve
return nil
}
}
// EncryptPwd specifies settings for the encrypt password to use.
//
// Default: empty
func (unixfsOpts) EncryptPwd(encryptPwd string) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.EncryptPwd = encryptPwd
return nil
}
}
func (unixfsOpts) Identity(id peer.ID) UnixfsAddOption {
return func(settings *UnixfsAddSettings) error {
settings.Identity = id
return nil
}
}