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statesync: check all necessary heights when adding snapshot to pool (#5516) (#5518)

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Fixes #5511.
This commit is contained in:
Erik Grinaker
2020-10-16 14:39:56 +02:00
committed by GitHub
parent bd1f43d793
commit b3238cdcd9
2 changed files with 18 additions and 8 deletions
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16
statesync/stateprovider.go
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@@ -94,6 +94,22 @@ func (s *lightClientStateProvider) AppHash(ctx context.Context, height uint64) (
if err != nil {
return nil, err
}
// We also try to fetch the blocks at height H and H+2, since we need these
// when building the state while restoring the snapshot. This avoids the race
// condition where we try to restore a snapshot before H+2 exists.
//
// FIXME This is a hack, since we can't add new methods to the interface without
// breaking it. We should instead have a Has(ctx, height) method which checks
// that the state provider has access to the necessary data for the height.
// We piggyback on AppHash() since it's called when adding snapshots to the pool.
_, err = s.lc.VerifyLightBlockAtHeight(ctx, int64(height+2), time.Now())
if err != nil {
return nil, err
}
_, err = s.lc.VerifyLightBlockAtHeight(ctx, int64(height), time.Now())
if err != nil {
return nil, err
}
return header.AppHash, nil
}