Finding a friend's subfeed

[staltz]

Add a find method to be able to find "my friends helsinki feed"

cc @mixmix

I think this could be achieved with branchStream, although branch stream is going to return all the intermediate branches, like

• root
• root-->v1
• root-->v1-->7
• root-->v1-->7-->chess
• root-->v1-->7-->gatherings

And we might need a simpler API that allows us to just get:

• chess
• gatherings

MAYBE. Because we might also need the friend's root metafeed (say we need to calculate the shard feed for their helsinki group feed, and to calculate shards we need to know the root MF ID).

[arj03]

Isn't this triangulate?

[staltz]

Yes I think we could close this issue. getTree has been pretty useful: https://github.com/ssbc/ssb-box2/blob/40399820ad007e058594eaf0e18633a5813d83cd/monitor.js#L66