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eth/downloader: retrieve pivot header from local chain if necessary #24610

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merged 5 commits into from
Apr 4, 2022
Merged

eth/downloader: retrieve pivot header from local chain if necessary #24610

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91ed02e
eth/downloader: retrieve pivot header from local chain if necessary
rjl493456442 Mar 30, 2022
8f8cba6
eth/downloader: improve readability
rjl493456442 Mar 31, 2022
b1b5690
eth/downloader: update fix
rjl493456442 Apr 1, 2022
8d651cd
eth/downloader: add beacon sync tests
rjl493456442 Apr 1, 2022
b59d235
eth/downloader: remove duplicated code
rjl493456442 Apr 1, 2022
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19 changes: 16 additions & 3 deletions eth/downloader/downloader.go
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Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,9 @@ type LightChain interface {
// GetHeaderByHash retrieves a header from the local chain.
GetHeaderByHash(common.Hash) *types.Header

// GetHeaderByNumber retrieves a block header from the local chain by number.
GetHeaderByNumber(number uint64) *types.Header

// CurrentHeader retrieves the head header from the local chain.
CurrentHeader() *types.Header

Expand Down Expand Up @@ -477,15 +480,22 @@ func (d *Downloader) syncWithPeer(p *peerConnection, hash common.Hash, td, ttd *
return err
}
if latest.Number.Uint64() > uint64(fsMinFullBlocks) {
pivot = d.skeleton.Header(latest.Number.Uint64() - uint64(fsMinFullBlocks))
number := latest.Number.Uint64() - uint64(fsMinFullBlocks)
pivot = d.skeleton.Header(number)
if pivot == nil {
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// Retrieve the pivot point from the local chain if it's
// not in the range of skeleton.
pivot = d.lightchain.GetHeaderByNumber(number)
}
}
}
// If no pivot block was returned, the head is below the min full block
// threshold (i.e. new chain). In that case we won't really snap sync
// anyway, but still need a valid pivot block to avoid some code hitting
// nil panics on access.
var noSnap bool
if mode == SnapSync && pivot == nil {
pivot = d.blockchain.CurrentBlock().Header()
pivot, noSnap = d.blockchain.CurrentBlock().Header(), true
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}
height := latest.Number.Uint64()

Expand Down Expand Up @@ -516,7 +526,10 @@ func (d *Downloader) syncWithPeer(p *peerConnection, hash common.Hash, td, ttd *
origin = 0
} else {
pivotNumber := pivot.Number.Uint64()
if pivotNumber <= origin {

// Only cap the sync origin number by pivot point when
// state sync is required.
if pivotNumber <= origin && !noSnap {
origin = pivotNumber - 1
}
// Write out the pivot into the database so a rollback beyond it will
Expand Down