Merge from concat -> aleph nodes

[yusefnapora]

This is basically working, but there's a few missing pieces:

• no support for "partially successful" merges. If an error is encountered after some number of successful statement / object ingestions, the merge promise will fail, and you don't get the counts
• I'm not yet verifying that the multihash for data objects we receive matches their keys
• need to test the signStatement / verifyStatement code

I need to look through this some more tomorrow to make sure I'm not forgetting anything; I can't see the forest for the trees at the moment :)

[parkan]

I'm assuming build failures here are related to what vyzo is working on right now?

[yusefnapora]

pretty sure this was another case of go dependencies getting out of sync with our docker image. I rebuilt it and re-ran... one failed with "MAC invalid" (wtf?)

[parkan]

yeah I've seen the MAC invalid error a few times in this situation (every time?)

[parkan]

Curious, was there a specific reason for doing this? Are the tests noticeably faster this way?

[yusefnapora]

I wanted to make sure that data from one test wouldn't "contaminate" the results for a subsequent test, since I'm asserting on e.g. the number of objects merged, and if I unthinkingly reuse the same {foo: "bar"} object in multiple tests, I might get the wrong result if the node already had it in the store from a previous test.

I tried doing a garbage collection pass on the datastore after each test, but you have to take the node offline first, and I was getting weird connection reset errors. So I figured I'd just make sure that all the data objects had a random component, so there's no chance of a duplicate object throwing things off.

[parkan]

ok, that makes sense