Routed Host Hangs

[ericxtang]

This used to work, but something happened recently that it no longer works.

For example, if you take example/echo.go, add

func makeKadHost(h host.Host) (host.Host, error) {
	dhtRouting := kad.NewDHT(context.Background(), h, ds.NewMapDatastore())
	if err := dhtRouting.Bootstrap(context.Background()); err != nil {
		glog.Errorf("Error bootstraping dht: %v", err)
		return nil, err
	}

	rHost := rhost.Wrap(h, dhtRouting)
	return rHost, nil
}

(rhost is github.com/libp2p/go-libp2p/p2p/host/routed)

If we use the KadHost instead of the basicHost for making connections, the connection hangs. Am I missing something here?

[Stebalien]

Could you post a complete repro (or open a PR that reproduces the issue)?

[ericxtang]

@Stebalien yeah - made a PR #206

[Stebalien]

It works for me after importing/rewriting the deps using gx (we use gx to deal with dependency versioning):

gx-go rewrite

# New deps from your patch.
gx import github.com/libp2p/go-libp2p-kad-dht
gx import github.com/ipfs/go-datastore

[ericxtang]

Woot! That worked. Seems like an issue where gx and github has different versions.

Thanks @Stebalien.

gx looks like a good way to do versioning. Is there a good tutorial for it besides the github repo? I'm interested in trying it out, but the hashes scare me. It would be great to have something like a go-path-to-hash lookup command.

[Stebalien]

Sorry for the slow response.

I'm not aware of any good tutorials for it and, unfortunately, the hashes are kind of unavoidable due to how go manages dependencies. @whyrusleeping considered using symlinks but go treats packages with different names as different packages even if they have the same code.

Note: You don't need to check the hashes into your code (just into packages.json). Instead, you can just call gx-go rw before building.