feat: integrate gossipsub by default

[vasco-santos]

This PR modified the configuration of a libp2p node, in order to allow the selection of the pubsub implementation to use.

Also, Gossipsub was added as the default pubsub implementation.

Needs:

• Release gossipsub-js
• Green CI on daemon libp2p/js-libp2p-daemon#26
• js-libp2p#365

[vasco-santos]

cc @wemeetagain @Mikerah

[jacobheun]

There are some unrelated failures in CI. This should be gtg once deps are updated.

[jacobheun]

@vasco-santos fyi, I rebased with master to get the latest test fixes here.

[vasco-santos]

Thanks @jacobheun

[vasco-santos]

@jacobheun updated this with the newest release candidate of js-libp2p.

I could remove the pubsub wrapper for promises, which was great. However, I had to do minor changes to start and dial. Basically, with the initial step for promises with https://github.com/libp2p/js-libp2p/blob/master/src/index.js#L191-L196 was overwriting the start and dial and I replaced them with _start and _ dial for now. Once we fully move to promises, we can remove this, what do you think?

[jacobheun]

@vasco-santos if that is breaking the sub class we need to fix js-libp2p. If other users are extending the libp2p class that's going to be a huge pain for them.

[vasco-santos]

I was thinking about it earlier. I don't know how common it is to extend the libp2p class and override start, dial, ... But anyway, we should avoid causing those problems.

The easier solution I see now is to change all the following functions: 'start', 'stop', 'dial', 'dialProtocol', 'dialFSM', 'hangUp', 'ping'. We need to check if we receive a callback and return a Promise if not. We will need to add a lot of spaghetti code though. What do you think?

[jacobheun]

@vasco-santos I think libp2p/js-libp2p#394 should resolve the problem.

[vasco-santos]

Thanks, I will try that here! But seems to fix the issue

[vasco-santos]

It worked 🎉

[jacobheun]

🎉just working on 1 last PR for libp2p and then I'll do another RC release

[jacobheun]

v0.26.0-rc.2 is on the web

[vasco-santos]

Updated here! Thanks @jacobheun

[jacobheun]

Updated to the latest release of libp2p, this is gtg!