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/
block.go
126 lines (104 loc) · 2.85 KB
/
block.go
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package options
import (
"fmt"
cid "github.com/ipsn/go-ipfs/gxlibs/github.com/ipfs/go-cid"
mh "github.com/ipsn/go-ipfs/gxlibs/github.com/multiformats/go-multihash"
)
type BlockPutSettings struct {
Codec string
MhType uint64
MhLength int
Pin bool
}
type BlockRmSettings struct {
Force bool
}
type BlockPutOption func(*BlockPutSettings) error
type BlockRmOption func(*BlockRmSettings) error
func BlockPutOptions(opts ...BlockPutOption) (*BlockPutSettings, cid.Prefix, error) {
options := &BlockPutSettings{
Codec: "",
MhType: mh.SHA2_256,
MhLength: -1,
Pin: false,
}
for _, opt := range opts {
err := opt(options)
if err != nil {
return nil, cid.Prefix{}, err
}
}
var pref cid.Prefix
pref.Version = 1
if options.Codec == "" {
if options.MhType != mh.SHA2_256 || (options.MhLength != -1 && options.MhLength != 32) {
options.Codec = "protobuf"
} else {
options.Codec = "v0"
}
}
if options.Codec == "v0" && options.MhType == mh.SHA2_256 {
pref.Version = 0
}
formatval, ok := cid.Codecs[options.Codec]
if !ok {
return nil, cid.Prefix{}, fmt.Errorf("unrecognized format: %s", options.Codec)
}
if options.Codec == "v0" {
if options.MhType != mh.SHA2_256 || (options.MhLength != -1 && options.MhLength != 32) {
return nil, cid.Prefix{}, fmt.Errorf("only sha2-255-32 is allowed with CIDv0")
}
}
pref.Codec = formatval
pref.MhType = options.MhType
pref.MhLength = options.MhLength
return options, pref, nil
}
func BlockRmOptions(opts ...BlockRmOption) (*BlockRmSettings, error) {
options := &BlockRmSettings{
Force: false,
}
for _, opt := range opts {
err := opt(options)
if err != nil {
return nil, err
}
}
return options, nil
}
type blockOpts struct{}
var Block blockOpts
// Format is an option for Block.Put which specifies the multicodec to use to
// serialize the object. Default is "v0"
func (blockOpts) Format(codec string) BlockPutOption {
return func(settings *BlockPutSettings) error {
settings.Codec = codec
return nil
}
}
// Hash is an option for Block.Put which specifies the multihash settings to use
// when hashing the object. Default is mh.SHA2_256 (0x12).
// If mhLen is set to -1, default length for the hash will be used
func (blockOpts) Hash(mhType uint64, mhLen int) BlockPutOption {
return func(settings *BlockPutSettings) error {
settings.MhType = mhType
settings.MhLength = mhLen
return nil
}
}
// Pin is an option for Block.Put which specifies whether to (recursively) pin
// added blocks
func (blockOpts) Pin(pin bool) BlockPutOption {
return func(settings *BlockPutSettings) error {
settings.Pin = pin
return nil
}
}
// Force is an option for Block.Rm which, when set to true, will ignore
// non-existing blocks
func (blockOpts) Force(force bool) BlockRmOption {
return func(settings *BlockRmSettings) error {
settings.Force = force
return nil
}
}