blockchain, aggregator, chaincfg, main, netsync: implement utreexo swiftsync #348
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kcalvinalvin
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We implement the aggregator and only add the leaf hashes that are still utxos at the end of the ttl state. We don't yet check that the aggregator ends up to 0 after we're finished with the swiftsync part of the ibd.
This is done so that the utreexoviewpoint will be re-loaded on shutdown and startup.
If we have ttls, it means we're still doing swiftsync part of the ibd which means that we don't perform any deletions. Since we don't perform deletions, there's no need to verify anything.
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The request bitmap is able to communicate that the requester wants all of the elements in each of the given fields in a utreexo proof.
After the swiftsync part of ibd has been completed, the aggregator should be at zero. The function let's outside callers handle the error if the aggregator isn't at zero.
When the swiftsync part of ibd is complete, the aggregator must be at 0. We now perform this check.
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