Use CoreAPI within `Unixfs().Get()`

[Stebalien]

Currently, this directly invokes the ls HTTP API endpoint but that means we need to duplicate some logic. It would be nice if we could just call Unixfs().Ls() and use that.

[tarekbadrsh]

Hello @Stebalien
I'm so exciting to work with IPFS
I'm trying to find what this issue about
I found that we are able to use Unixfs().Get() normally as you can find in this Gist
https://gist.github.com/tarekbadrshalaan/3efa2d69d169d00dc5d717e9afa1b284#file-use_go-ipfs-http-client-go-L24

so please try to explain more and I will work on it.

[Stebalien]

This issue is about refactoring Unixfs().Get() to use Unixfs().Ls() instead of manually calling ls:

go-ipfs-http-client/apifile.go

Lines 228 to 231 in 6062f4d

	resp, err := api.core().Request("ls", p.String()).
	Option("resolve-size", true).
	Option("stream", true).Send(ctx)

That way, we don't need to re-implement decoding ls here:

go-ipfs-http-client/apifile.go

Lines 147 to 196 in 6062f4d

	func (it *apiIter) Next() bool {
	if it.ctx.Err() != nil {
	it.err = it.ctx.Err()
	return false
	}
	var out lsOutput
	if err := it.dec.Decode(&out); err != nil {
	if err != io.EOF {
	it.err = err
	}
	return false
	}
	if len(out.Objects) != 1 {
	it.err = fmt.Errorf("ls returned more objects than expected (%d)", len(out.Objects))
	return false
	}
	if len(out.Objects[0].Links) != 1 {
	it.err = fmt.Errorf("ls returned more links than expected (%d)", len(out.Objects[0].Links))
	return false
	}
	it.cur = out.Objects[0].Links[0]
	c, err := cid.Parse(it.cur.Hash)
	if err != nil {
	it.err = err
	return false
	}
	switch it.cur.Type {
	case unixfs.THAMTShard, unixfs.TMetadata, unixfs.TDirectory:
	it.curFile, err = it.core.getDir(it.ctx, path.IpfsPath(c), int64(it.cur.Size))
	if err != nil {
	it.err = err
	return false
	}
	case unixfs.TFile:
	it.curFile, err = it.core.getFile(it.ctx, path.IpfsPath(c), int64(it.cur.Size))
	if err != nil {
	it.err = err
	return false
	}
	default:
	it.err = fmt.Errorf("file type %d not supported", it.cur.Type)
	return false
	}
	return true
	}