/
coreapi.go
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/
coreapi.go
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package coreapi
import (
"context"
core "github.com/ipfs/go-ipfs/core"
coreiface "github.com/ipfs/go-ipfs/core/coreapi/interface"
namesys "github.com/ipfs/go-ipfs/namesys"
ipfspath "github.com/ipfs/go-ipfs/path"
resolver "github.com/ipfs/go-ipfs/path/resolver"
uio "github.com/ipfs/go-ipfs/unixfs/io"
cid "gx/ipfs/QmcZfnkapfECQGcLZaf9B79NRg7cRa9EnZh4LSbkCzwNvY/go-cid"
ipld "gx/ipfs/Qme5bWv7wtjUNGsK2BNGVUFPKiuxWrsqrtvYwCLRw8YFES/go-ipld-format"
)
type CoreAPI struct {
node *core.IpfsNode
}
// NewCoreAPI creates new instance of IPFS CoreAPI backed by go-ipfs Node.
func NewCoreAPI(n *core.IpfsNode) coreiface.CoreAPI {
api := &CoreAPI{n}
return api
}
// Unixfs returns the UnixfsAPI interface backed by the go-ipfs node
func (api *CoreAPI) Unixfs() coreiface.UnixfsAPI {
return (*UnixfsAPI)(api)
}
func (api *CoreAPI) Block() coreiface.BlockAPI {
return &BlockAPI{api, nil}
}
// Dag returns the DagAPI interface backed by the go-ipfs node
func (api *CoreAPI) Dag() coreiface.DagAPI {
return &DagAPI{api, nil}
}
// Name returns the NameAPI interface backed by the go-ipfs node
func (api *CoreAPI) Name() coreiface.NameAPI {
return &NameAPI{api, nil}
}
// Key returns the KeyAPI interface backed by the go-ipfs node
func (api *CoreAPI) Key() coreiface.KeyAPI {
return &KeyAPI{api, nil}
}
//Object returns the ObjectAPI interface backed by the go-ipfs node
func (api *CoreAPI) Object() coreiface.ObjectAPI {
return &ObjectAPI{api, nil}
}
func (api *CoreAPI) Pin() coreiface.PinAPI {
return &PinAPI{api, nil}
}
// ResolveNode resolves the path `p` using Unixfx resolver, gets and returns the
// resolved Node.
func (api *CoreAPI) ResolveNode(ctx context.Context, p coreiface.Path) (coreiface.Node, error) {
return resolveNode(ctx, api.node.DAG, api.node.Namesys, p)
}
func resolveNode(ctx context.Context, ng ipld.NodeGetter, nsys namesys.NameSystem, p coreiface.Path) (coreiface.Node, error) {
p, err := resolvePath(ctx, ng, nsys, p)
if err != nil {
return nil, err
}
node, err := ng.Get(ctx, p.Cid())
if err != nil {
return nil, err
}
return node, nil
}
// ResolvePath resolves the path `p` using Unixfs resolver, returns the
// resolved path.
// TODO: store all of ipfspath.Resolver.ResolvePathComponents() in Path
func (api *CoreAPI) ResolvePath(ctx context.Context, p coreiface.Path) (coreiface.Path, error) {
return resolvePath(ctx, api.node.DAG, api.node.Namesys, p)
}
func resolvePath(ctx context.Context, ng ipld.NodeGetter, nsys namesys.NameSystem, p coreiface.Path) (coreiface.Path, error) {
if p.Resolved() {
return p, nil
}
r := &resolver.Resolver{
DAG: ng,
ResolveOnce: uio.ResolveUnixfsOnce,
}
p2 := ipfspath.FromString(p.String())
node, err := core.Resolve(ctx, nsys, r, p2)
if err == core.ErrNoNamesys {
return nil, coreiface.ErrOffline
} else if err != nil {
return nil, err
}
var root *cid.Cid
if p2.IsJustAKey() {
root = node.Cid()
}
return ResolvedPath(p.String(), node.Cid(), root), nil
}
// Implements coreiface.Path
type path struct {
path ipfspath.Path
cid *cid.Cid
root *cid.Cid
}
// ParsePath parses path `p` using ipfspath parser, returns the parsed path.
func ParsePath(p string) (coreiface.Path, error) {
pp, err := ipfspath.ParsePath(p)
if err != nil {
return nil, err
}
return &path{path: pp}, nil
}
// ParseCid parses the path from `c`, retruns the parsed path.
func ParseCid(c *cid.Cid) coreiface.Path {
return &path{path: ipfspath.FromCid(c), cid: c, root: c}
}
// ResolvePath parses path from string `p`, returns parsed path.
func ResolvedPath(p string, c *cid.Cid, r *cid.Cid) coreiface.Path {
return &path{path: ipfspath.FromString(p), cid: c, root: r}
}
func (p *path) String() string { return p.path.String() }
func (p *path) Cid() *cid.Cid { return p.cid }
func (p *path) Root() *cid.Cid { return p.root }
func (p *path) Resolved() bool { return p.cid != nil }