Resume sync if using IndexedBlockSource #17
Merged
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This PR adds the
IndexedBlockSource
trait, which is aBlockSource
that returns blocks sorted by their block count, along with the block count itself.Changed AddressIndex struct to take a trait object for the BlockSource, to allow dynamic dispatching over the BlockSource, and to potentially change BlockSource impl at run time in the future.
Using those traits, if available, the database will store the block count and resume from where it left off during sync