package store_test import ( "context" "testing" "github.com/stretchr/testify/require" "github.com/filecoin-project/lotus/chain/gen" ) func TestChainCheckpoint(t *testing.T) { cg, err := gen.NewGenerator() if err != nil { t.Fatal(err) } // Let the first miner mine some blocks. last := cg.CurTipset.TipSet() for i := 0; i < 4; i++ { ts, err := cg.NextTipSetFromMiners(last, cg.Miners[:1]) require.NoError(t, err) last = ts.TipSet.TipSet() } cs := cg.ChainStore() checkpoint := last checkpointParents, err := cs.GetTipSetFromKey(checkpoint.Parents()) require.NoError(t, err) // Set the head to the block before the checkpoint. err = cs.SetHead(checkpointParents) require.NoError(t, err) // Verify it worked. head := cs.GetHeaviestTipSet() require.True(t, head.Equals(checkpointParents)) // Try to set the checkpoint in the future, it should fail. err = cs.SetCheckpoint(checkpoint) require.Error(t, err) // Then move the head back. err = cs.SetHead(checkpoint) require.NoError(t, err) // Verify it worked. head = cs.GetHeaviestTipSet() require.True(t, head.Equals(checkpoint)) // And checkpoint it. err = cs.SetCheckpoint(checkpoint) require.NoError(t, err) // Let the second miner miner mine a fork last = checkpointParents for i := 0; i < 4; i++ { ts, err := cg.NextTipSetFromMiners(last, cg.Miners[1:]) require.NoError(t, err) last = ts.TipSet.TipSet() } // See if the chain will take the fork, it shouldn't. err = cs.MaybeTakeHeavierTipSet(context.Background(), last) require.NoError(t, err) head = cs.GetHeaviestTipSet() require.True(t, head.Equals(checkpoint)) // Remove the checkpoint. err = cs.RemoveCheckpoint() require.NoError(t, err) // Now switch to the other fork. err = cs.MaybeTakeHeavierTipSet(context.Background(), last) require.NoError(t, err) head = cs.GetHeaviestTipSet() require.True(t, head.Equals(last)) // Setting a checkpoint on the other fork should fail. err = cs.SetCheckpoint(checkpoint) require.Error(t, err) // Setting a checkpoint on this fork should succeed. err = cs.SetCheckpoint(checkpointParents) require.NoError(t, err) }