eth/downloader: terminate beacon sync early when linked to local chain #24550
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MariusVanDerWijden
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ethereum#24550) * eth/downloader: terminate beacon sync early when linked to local chain * eth/downloader: fix backfiller resume on early beacon termination
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ethereum#24550) * eth/downloader: terminate beacon sync early when linked to local chain * eth/downloader: fix backfiller resume on early beacon termination
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ethereum#24550) * eth/downloader: terminate beacon sync early when linked to local chain * eth/downloader: fix backfiller resume on early beacon termination
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Up until now the beacon sync ran until we downloaded all the header up to genesis and we started using that as the driver for the backfiller. Whilst this is simple and elegant, it does pose a problem during mainnet transition: a peer will stall on the first sethead until it redownloads all the headers it already has locally.
This PR adds a database check for every beacon header acceptance to check if the associated (parent) block body and receipt is present already in the local chain or not. If both are present (the header is surely present in that case), we can stop downloading headers and just call it a day.
Some additional checks needed to be added to ensure that we ignore the part of the beacon headers that have not been downloaded.