Initial XBR protocol implementation

[om26er]

Implements the XBR Buyer and Seller

There are things that still don't work, we still have a sample.js file that needs to be removed before landing it.

[oberstet]

I closed above PR, but added CI test coverage for using native binary payloads across JS and Py via

autobahn-js/test/test_binary.js

Line 21 in caa775a

AutobahnJS supports use of native binary values in application payload args/kwargs

- IOW: this "should work" (calling the market maker with native bytes). we could also add CI tests actually running a crossbarfx node with market maker .. more work though;)

[oberstet]

to enforce using CBOR, a WAMP connection can be created like this:

var config = {
    url: "ws://127.0.0.1:8080/ws",
    realm: "realm1",
    serializers: [new autobahn.serializer.CBORSerializer()]
};

var connection = new autobahn.Connection(config);

[oberstet]

yeah, this looks good! basic class structure is there and uses the new dependencies for actual crypto. guess it is quite close to full interop with ABPy based XBR stuff .. awesome=)

[om26er]

The Buyer and Seller both are implemented now (close to ABPy), but require feedback on method signatures (added inline comment).

Also @oberstet is it fine to do a release right after this lands ?

[om26er]

@oberstet Need your input on this API signature. Currently it takes two callbacks on_success and on_failure as parameters because start() makes a call to session.call() and returns instantly, hence we can't really return the result as we do in the Python implementation.

Are you fine with that approach or do we want to use something different here (and in other places below).

[oberstet]

start should return a proper promise (not take callback args), and then you can fire the promise with success or error later on ..

[oberstet]

rgd new release: sure!

[om26er]

OK, now moved from callback(s) approach to deferred as used by other parts of the library.

Note: Moved around small part of the library code into utils.js.

[oberstet]

@om26er should we merge this or do you want to piggyback more onto? if you wanna merge, go ahead (merge yourself)! looks good

[om26er]

Ok, landing this now. More fixes/changes to follow