lotus/chain/checkpoint.go

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package chain
import (
"context"
"golang.org/x/xerrors"
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"github.com/filecoin-project/lotus/chain/types"
)
func (syncer *Syncer) SyncCheckpoint(ctx context.Context, tsk types.TipSetKey) error {
if tsk == types.EmptyTSK {
return xerrors.Errorf("called with empty tsk")
}
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ts, err := syncer.ChainStore().LoadTipSet(ctx, tsk)
if err != nil {
tss, err := syncer.Exchange.GetBlocks(ctx, tsk, 1)
if err != nil {
return xerrors.Errorf("failed to fetch tipset: %w", err)
} else if len(tss) != 1 {
return xerrors.Errorf("expected 1 tipset, got %d", len(tss))
}
ts = tss[0]
}
hts := syncer.ChainStore().GetHeaviestTipSet()
if !hts.Equals(ts) {
if anc, err := syncer.store.IsAncestorOf(ctx, ts, hts); err != nil {
return xerrors.Errorf("failed to walk the chain when checkpointing: %w", err)
} else if !anc {
if err := syncer.collectChain(ctx, ts, hts, true); err != nil {
return xerrors.Errorf("failed to collect chain for checkpoint: %w", err)
}
} // else new checkpoint is on the current chain, we definitely have the tipsets.
} // else current head, no need to switch.
if err := syncer.ChainStore().SetCheckpoint(ctx, ts); err != nil {
return xerrors.Errorf("failed to set the chain checkpoint: %w", err)
}
return nil
}