forked from cerc-io/ipld-eth-server
104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
package merkledag
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import (
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"encoding/json"
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"fmt"
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"github.com/ipfs/go-block-format"
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cid "github.com/ipfs/go-cid"
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u "github.com/ipfs/go-ipfs-util"
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ipld "github.com/ipfs/go-ipld-format"
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)
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// RawNode represents a node which only contains data.
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type RawNode struct {
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blocks.Block
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}
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// NewRawNode creates a RawNode using the default sha2-256 hash function.
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func NewRawNode(data []byte) *RawNode {
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h := u.Hash(data)
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c := cid.NewCidV1(cid.Raw, h)
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blk, _ := blocks.NewBlockWithCid(data, c)
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return &RawNode{blk}
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}
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// DecodeRawBlock is a block decoder for raw IPLD nodes conforming to `node.DecodeBlockFunc`.
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func DecodeRawBlock(block blocks.Block) (ipld.Node, error) {
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if block.Cid().Type() != cid.Raw {
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return nil, fmt.Errorf("raw nodes cannot be decoded from non-raw blocks: %d", block.Cid().Type())
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}
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// Once you "share" a block, it should be immutable. Therefore, we can just use this block as-is.
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return &RawNode{block}, nil
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}
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var _ ipld.DecodeBlockFunc = DecodeRawBlock
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// NewRawNodeWPrefix creates a RawNode using the provided cid builder
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func NewRawNodeWPrefix(data []byte, builder cid.Builder) (*RawNode, error) {
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builder = builder.WithCodec(cid.Raw)
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c, err := builder.Sum(data)
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if err != nil {
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return nil, err
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}
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blk, err := blocks.NewBlockWithCid(data, c)
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if err != nil {
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return nil, err
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}
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return &RawNode{blk}, nil
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}
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// Links returns nil.
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func (rn *RawNode) Links() []*ipld.Link {
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return nil
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}
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// ResolveLink returns an error.
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func (rn *RawNode) ResolveLink(path []string) (*ipld.Link, []string, error) {
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return nil, nil, ErrLinkNotFound
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}
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// Resolve returns an error.
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func (rn *RawNode) Resolve(path []string) (interface{}, []string, error) {
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return nil, nil, ErrLinkNotFound
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}
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// Tree returns nil.
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func (rn *RawNode) Tree(p string, depth int) []string {
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return nil
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}
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// Copy performs a deep copy of this node and returns it as an ipld.Node
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func (rn *RawNode) Copy() ipld.Node {
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copybuf := make([]byte, len(rn.RawData()))
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copy(copybuf, rn.RawData())
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nblk, err := blocks.NewBlockWithCid(rn.RawData(), rn.Cid())
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if err != nil {
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// programmer error
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panic("failure attempting to clone raw block: " + err.Error())
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}
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return &RawNode{nblk}
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}
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// Size returns the size of this node
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func (rn *RawNode) Size() (uint64, error) {
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return uint64(len(rn.RawData())), nil
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}
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// Stat returns some Stats about this node.
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func (rn *RawNode) Stat() (*ipld.NodeStat, error) {
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return &ipld.NodeStat{
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CumulativeSize: len(rn.RawData()),
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DataSize: len(rn.RawData()),
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}, nil
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}
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// MarshalJSON is required for our "ipfs dag" commands.
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func (rn *RawNode) MarshalJSON() ([]byte, error) {
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return json.Marshal(string(rn.RawData()))
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}
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var _ ipld.Node = (*RawNode)(nil)
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