8f309b214b
That way, checkpoints can be enforced by the chainstore, removing a potential race where an in-progress sync of a fork could bypass a sync checkpoint.
58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
package chain
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import (
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"context"
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"github.com/filecoin-project/lotus/chain/types"
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"golang.org/x/xerrors"
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)
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func (syncer *Syncer) SyncCheckpoint(ctx context.Context, tsk types.TipSetKey) error {
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if tsk == types.EmptyTSK {
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return xerrors.Errorf("called with empty tsk")
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}
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ts, err := syncer.ChainStore().LoadTipSet(tsk)
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if err != nil {
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tss, err := syncer.Exchange.GetBlocks(ctx, tsk, 1)
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if err != nil {
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return xerrors.Errorf("failed to fetch tipset: %w", err)
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} else if len(tss) != 1 {
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return xerrors.Errorf("expected 1 tipset, got %d", len(tss))
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}
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ts = tss[0]
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}
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if err := syncer.switchChain(ctx, ts); err != nil {
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return xerrors.Errorf("failed to switch chain when syncing checkpoint: %w", err)
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}
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if err := syncer.ChainStore().SetCheckpoint(ts); err != nil {
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return xerrors.Errorf("failed to set the chain checkpoint: %w", err)
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}
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return nil
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}
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func (syncer *Syncer) switchChain(ctx context.Context, ts *types.TipSet) error {
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hts := syncer.ChainStore().GetHeaviestTipSet()
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if hts.Equals(ts) {
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return nil
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}
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if anc, err := syncer.store.IsAncestorOf(ts, hts); err == nil && anc {
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return nil
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}
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// Otherwise, sync the chain and set the head.
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if err := syncer.collectChain(ctx, ts, hts, true); err != nil {
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return xerrors.Errorf("failed to collect chain for checkpoint: %w", err)
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}
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if err := syncer.ChainStore().SetHead(ts); err != nil {
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return xerrors.Errorf("failed to set the chain head: %w", err)
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}
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return nil
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}
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