this is a trivial operation for storagenode/console, as it doesn't
really need or use kademlia in the first place.
What:
Removes kademlia from storagenode/console
Why:
We are in the process of getting rid of kademlia, and this is one place where it's particularly easy.
Please describe the tests:
Existing tests exercise storagenode/console behavior; if they continue to work, everything here should be tested satisfactorily.
Please describe the performance impact:
None
Deprecate the pieceinfo database, and start storing piece info as a header to
piece files. Institute a "storage format version" concept allowing us to handle
pieces stored under multiple different types of storage. Add a piece_expirations
table which will still be used to track expiration times, so we can query it, but
which should be much smaller than the pieceinfo database would be for the
same number of pieces. (Only pieces with expiration times need to be stored in piece_expirations, and we don't need to store large byte blobs like the serialized
order limit, etc.) Use specialized names for accessing any functionality related
only to dealing with V0 pieces (e.g., `store.V0PieceInfo()`). Move SpaceUsed-
type functionality under the purview of the piece store. Add some generic
interfaces for traversing all blobs or all pieces. Add lots of tests.
