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110 lines
3.1 KiB
Go
110 lines
3.1 KiB
Go
package coreapi
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import (
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"context"
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core "github.com/ipfs/go-ipfs/core"
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coreiface "github.com/ipfs/go-ipfs/core/coreapi/interface"
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caopts "github.com/ipfs/go-ipfs/core/coreapi/interface/options"
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namesys "github.com/ipfs/go-ipfs/namesys"
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ipfspath "github.com/ipfs/go-ipfs/path"
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resolver "github.com/ipfs/go-ipfs/path/resolver"
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uio "github.com/ipfs/go-ipfs/unixfs/io"
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ipld "gx/ipfs/QmWi2BYBL5gJ3CiAiQchg6rn1A8iBsrWy51EYxvHVjFvLb/go-ipld-format"
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cid "gx/ipfs/QmapdYm1b22Frv3k17fqrBYTFRxwiaVJkB299Mfn33edeB/go-cid"
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)
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// ResolveNode resolves the path `p` using Unixfx resolver, gets and returns the
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// resolved Node.
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func (api *CoreAPI) ResolveNode(ctx context.Context, p coreiface.Path) (ipld.Node, error) {
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return resolveNode(ctx, api.node.DAG, api.node.Namesys, p)
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}
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func resolveNode(ctx context.Context, ng ipld.NodeGetter, nsys namesys.NameSystem, p coreiface.Path) (ipld.Node, error) {
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p, err := resolvePath(ctx, ng, nsys, p)
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if err != nil {
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return nil, err
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}
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node, err := ng.Get(ctx, p.Cid())
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if err != nil {
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return nil, err
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}
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return node, nil
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}
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// ResolvePath resolves the path `p` using Unixfs resolver, returns the
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// resolved path.
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// TODO: store all of ipfspath.Resolver.ResolvePathComponents() in Path
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func (api *CoreAPI) ResolvePath(ctx context.Context, p coreiface.Path) (coreiface.Path, error) {
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return resolvePath(ctx, api.node.DAG, api.node.Namesys, p)
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}
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func resolvePath(ctx context.Context, ng ipld.NodeGetter, nsys namesys.NameSystem, p coreiface.Path) (coreiface.Path, error) {
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if p.Resolved() {
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return p, nil
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}
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r := &resolver.Resolver{
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DAG: ng,
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ResolveOnce: uio.ResolveUnixfsOnce,
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}
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p2 := ipfspath.FromString(p.String())
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node, err := core.Resolve(ctx, nsys, r, p2)
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if err == core.ErrNoNamesys {
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return nil, coreiface.ErrOffline
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} else if err != nil {
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return nil, err
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}
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var root *cid.Cid
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if p2.IsJustAKey() {
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root = node.Cid()
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}
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return ResolvedPath(p.String(), node.Cid(), root), nil
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}
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// Implements coreiface.Path
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type path struct {
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path ipfspath.Path
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cid *cid.Cid
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root *cid.Cid
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}
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// ParsePath parses path `p` using ipfspath parser, returns the parsed path.
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func (api *CoreAPI) ParsePath(ctx context.Context, p string, opts ...caopts.ParsePathOption) (coreiface.Path, error) {
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options, err := caopts.ParsePathOptions(opts...)
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if err != nil {
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return nil, err
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}
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pp, err := ipfspath.ParsePath(p)
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if err != nil {
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return nil, err
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}
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res := &path{path: pp}
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if options.Resolve {
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return api.ResolvePath(ctx, res)
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}
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return res, nil
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}
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// ParseCid parses the path from `c`, retruns the parsed path.
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func (api *CoreAPI) ParseCid(c *cid.Cid) coreiface.Path {
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return &path{path: ipfspath.FromCid(c), cid: c, root: c}
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}
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// ResolvePath parses path from string `p`, returns parsed path.
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func ResolvedPath(p string, c *cid.Cid, r *cid.Cid) coreiface.Path {
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return &path{path: ipfspath.FromString(p), cid: c, root: r}
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}
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func (p *path) String() string { return p.path.String() }
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func (p *path) Cid() *cid.Cid { return p.cid }
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func (p *path) Root() *cid.Cid { return p.root }
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func (p *path) Resolved() bool { return p.cid != nil }
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