Fix: drand: calculation of round from Filecoin epochs #8606
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Added test. |
chain/beacon/drand/drand.go
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| // we take the time from genesis divided by the periods in seconds, that | ||
| // gives us the number of periods since genesis. We also add +1 because | ||
| // round 1 starts at genesis time. | ||
| return uint64(math.Floor(float64(fromGenesis)/db.interval.Seconds())) + 1 |
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I feel a bit uneasy using floats for this.
As you only need Floor it should be simple to do using pure ints.
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I agree, simplifying this.
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Hey, how does it work during the upgrade? |
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Ahh, right in this upgrade we only add on one breacon. Ok, I can see how that can work. |
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Yeah, so what should happen is just that the first block after the upgrade kicks in should have 2 beacon entries (exactly as we have after a null tipset). |
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| dround := (latestTs - db.drandGenTime) / uint64(db.interval.Seconds()) | ||
| return dround | ||
| } | ||
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| func (db *DrandBeacon) maxBeaconRoundV2(latestTs uint64) uint64 { | ||
| if latestTs < db.drandGenTime { | ||
| return 1 |
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When latestTs == db.drandGenTime, the round will be 1. I don't know if it matters, but it may make more sense to let the round be 0 before that.
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Not super important for mainnet, but I think your argument makes sense. Changing.
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Actually, looking at Drand code, round 0 seems to indicate a special value that says "give me the latest entry".
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Gonna leave as is, for now.
Related Issues
Resolves #2170
Proposed Changes
This PR was originally opened for the v14 upgrade, but descoped.
Additional Info
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<PR type>: <area>: <change being made>fix: mempool: Introduce a cache for valid signaturesPR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, testarea: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps