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-rw-r--r--core/blockchain.go13
-rw-r--r--core/blockchain_test.go48
2 files changed, 54 insertions, 7 deletions
diff --git a/core/blockchain.go b/core/blockchain.go
index 737fbe3ee..f886ffe4e 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -465,7 +465,7 @@ func (bc *BlockChain) insert(block *types.Block) {
}
bc.currentBlock = block
- // If the block is better than out head or is on a different chain, force update heads
+ // If the block is better than our head or is on a different chain, force update heads
if updateHeads {
bc.hc.SetCurrentHeader(block.Header())
@@ -1140,18 +1140,17 @@ func (bc *BlockChain) reorg(oldBlock, newBlock *types.Block) error {
} else {
log.Error("Impossible reorg, please file an issue", "oldnum", oldBlock.Number(), "oldhash", oldBlock.Hash(), "newnum", newBlock.Number(), "newhash", newBlock.Hash())
}
+ // Insert the new chain, taking care of the proper incremental order
var addedTxs types.Transactions
- // insert blocks. Order does not matter. Last block will be written in ImportChain itself which creates the new head properly
- for _, block := range newChain {
+ for i := len(newChain) - 1; i >= 0; i-- {
// insert the block in the canonical way, re-writing history
- bc.insert(block)
+ bc.insert(newChain[i])
// write lookup entries for hash based transaction/receipt searches
- if err := WriteTxLookupEntries(bc.chainDb, block); err != nil {
+ if err := WriteTxLookupEntries(bc.chainDb, newChain[i]); err != nil {
return err
}
- addedTxs = append(addedTxs, block.Transactions()...)
+ addedTxs = append(addedTxs, newChain[i].Transactions()...)
}
-
// calculate the difference between deleted and added transactions
diff := types.TxDifference(deletedTxs, addedTxs)
// When transactions get deleted from the database that means the
diff --git a/core/blockchain_test.go b/core/blockchain_test.go
index 26c816027..cbde3bcd2 100644
--- a/core/blockchain_test.go
+++ b/core/blockchain_test.go
@@ -1197,3 +1197,51 @@ func TestEIP161AccountRemoval(t *testing.T) {
t.Error("account should not exist")
}
}
+
+// This is a regression test (i.e. as weird as it is, don't delete it ever), which
+// tests that under weird reorg conditions the blockchain and its internal header-
+// chain return the same latest block/header.
+//
+// https://github.com/ethereum/go-ethereum/pull/15941
+func TestBlockchainHeaderchainReorgConsistency(t *testing.T) {
+ // Generate a canonical chain to act as the main dataset
+ engine := ethash.NewFaker()
+
+ db, _ := ethdb.NewMemDatabase()
+ genesis := new(Genesis).MustCommit(db)
+ blocks, _ := GenerateChain(params.TestChainConfig, genesis, engine, db, 64, func(i int, b *BlockGen) { b.SetCoinbase(common.Address{1}) })
+
+ // Generate a bunch of fork blocks, each side forking from the canonical chain
+ forks := make([]*types.Block, len(blocks))
+ for i := 0; i < len(forks); i++ {
+ parent := genesis
+ if i > 0 {
+ parent = blocks[i-1]
+ }
+ fork, _ := GenerateChain(params.TestChainConfig, parent, engine, db, 1, func(i int, b *BlockGen) { b.SetCoinbase(common.Address{2}) })
+ forks[i] = fork[0]
+ }
+ // Import the canonical and fork chain side by side, verifying the current block
+ // and current header consistency
+ diskdb, _ := ethdb.NewMemDatabase()
+ new(Genesis).MustCommit(diskdb)
+
+ chain, err := NewBlockChain(diskdb, params.TestChainConfig, engine, vm.Config{})
+ if err != nil {
+ t.Fatalf("failed to create tester chain: %v", err)
+ }
+ for i := 0; i < len(blocks); i++ {
+ if _, err := chain.InsertChain(blocks[i : i+1]); err != nil {
+ t.Fatalf("block %d: failed to insert into chain: %v", i, err)
+ }
+ if chain.CurrentBlock().Hash() != chain.CurrentHeader().Hash() {
+ t.Errorf("block %d: current block/header mismatch: block #%d [%x…], header #%d [%x…]", i, chain.CurrentBlock().Number(), chain.CurrentBlock().Hash().Bytes()[:4], chain.CurrentHeader().Number, chain.CurrentHeader().Hash().Bytes()[:4])
+ }
+ if _, err := chain.InsertChain(forks[i : i+1]); err != nil {
+ t.Fatalf(" fork %d: failed to insert into chain: %v", i, err)
+ }
+ if chain.CurrentBlock().Hash() != chain.CurrentHeader().Hash() {
+ t.Errorf(" fork %d: current block/header mismatch: block #%d [%x…], header #%d [%x…]", i, chain.CurrentBlock().Number(), chain.CurrentBlock().Hash().Bytes()[:4], chain.CurrentHeader().Number, chain.CurrentHeader().Hash().Bytes()[:4])
+ }
+ }
+}