2019-02-06 16:01:04 +00:00
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import times, chronos
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2019-02-05 15:40:29 +00:00
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type
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FullNodeSyncer* = ref object
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chaindb: ChainDB
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FastChainSyncer = ref object
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RegularChainSyncer = ref object
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# How old (in seconds) must our local head be to cause us to start with a fast-sync before we
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# switch to regular-sync.
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const FAST_SYNC_CUTOFF = 60 * 60 * 24
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proc run(s: FullNodeSyncer) {.async.} =
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let head = await s.chaindb.getCanonicalHead()
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# We're still too slow at block processing, so if our local head is older than
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# FAST_SYNC_CUTOFF we first do a fast-sync run to catch up with the rest of the network.
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# See https://github.com/ethereum/py-evm/issues/654 for more details
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if head.timestamp < epochTime() - FAST_SYNC_CUTOFF:
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# Fast-sync chain data.
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self.logger.info("Starting fast-sync; current head: #%d", head.block_number)
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chain_syncer = FastChainSyncer(self.chaindb, self.peer_pool, self.cancel_token)
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await chain_syncer.run()
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# Ensure we have the state for our current head.
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head = await self.wait(self.chaindb.coro_get_canonical_head())
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if head.state_root != BLANK_ROOT_HASH and head.state_root not in self.base_db:
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self.logger.info(
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"Missing state for current head (#%d), downloading it", head.block_number)
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downloader = StateDownloader(
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self.base_db, head.state_root, self.peer_pool, self.cancel_token)
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await downloader.run()
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# Now, loop forever, fetching missing blocks and applying them.
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self.logger.info("Starting regular sync; current head: #%d", head.block_number)
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# This is a bit of a hack, but self.chain is stuck in the past as during the fast-sync we
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# did not use it to import the blocks, so we need this to get a Chain instance with our
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# latest head so that we can start importing blocks.
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new_chain = type(self.chain)(self.base_db)
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chain_syncer = RegularChainSyncer(
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new_chain, self.chaindb, self.peer_pool, self.cancel_token)
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await chain_syncer.run()
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