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+// Copyright 2016 The go-ethereum Authors
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+// This file is part of the go-ethereum library.
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+//
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+// The go-ethereum library is free software: you can redistribute it and/or modify
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+// it under the terms of the GNU Lesser General Public License as published by
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+// the Free Software Foundation, either version 3 of the License, or
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+// (at your option) any later version.
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+//
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+// The go-ethereum library is distributed in the hope that it will be useful,
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+// but WITHOUT ANY WARRANTY; without even the implied warranty of
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+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+// GNU Lesser General Public License for more details.
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+//
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+// You should have received a copy of the GNU Lesser General Public License
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+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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+
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+package core
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+
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+import (
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+ "math/big"
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+ "testing"
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+
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+ "github.com/ethereum/go-ethereum/ethdb"
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+ "github.com/ethereum/go-ethereum/event"
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+ "github.com/ethereum/go-ethereum/params"
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+)
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+
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+// Tests that DAO-fork enabled clients can properly filter out fork-commencing
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+// blocks based on their extradata fields.
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+func TestDAOForkRangeExtradata(t *testing.T) {
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+ forkBlock := big.NewInt(32)
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+
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+ // Generate a common prefix for both pro-forkers and non-forkers
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+ db, _ := ethdb.NewMemDatabase()
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+ genesis := WriteGenesisBlockForTesting(db)
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+ prefix, _ := GenerateChain(nil, genesis, db, int(forkBlock.Int64()-1), func(i int, gen *BlockGen) {})
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+
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+ // Create the concurrent, conflicting two nodes
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+ proDb, _ := ethdb.NewMemDatabase()
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+ WriteGenesisBlockForTesting(proDb)
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+ proConf := &ChainConfig{HomesteadBlock: big.NewInt(0), DAOForkBlock: forkBlock, DAOForkSupport: true}
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+ proBc, _ := NewBlockChain(proDb, proConf, new(FakePow), new(event.TypeMux))
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+
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+ conDb, _ := ethdb.NewMemDatabase()
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+ WriteGenesisBlockForTesting(conDb)
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+ conConf := &ChainConfig{HomesteadBlock: big.NewInt(0), DAOForkBlock: forkBlock, DAOForkSupport: false}
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+ conBc, _ := NewBlockChain(conDb, conConf, new(FakePow), new(event.TypeMux))
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+
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+ if _, err := proBc.InsertChain(prefix); err != nil {
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+ t.Fatalf("pro-fork: failed to import chain prefix: %v", err)
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+ }
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+ if _, err := conBc.InsertChain(prefix); err != nil {
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+ t.Fatalf("con-fork: failed to import chain prefix: %v", err)
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+ }
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+ // Try to expand both pro-fork and non-fork chains iteratively with other camp's blocks
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+ for i := int64(0); i < params.DAOForkExtraRange.Int64(); i++ {
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+ // Create a pro-fork block, and try to feed into the no-fork chain
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+ db, _ = ethdb.NewMemDatabase()
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+ WriteGenesisBlockForTesting(db)
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+ bc, _ := NewBlockChain(db, conConf, new(FakePow), new(event.TypeMux))
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+
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+ blocks := conBc.GetBlocksFromHash(conBc.CurrentBlock().Hash(), int(conBc.CurrentBlock().NumberU64()+1))
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+ for j := 0; j < len(blocks)/2; j++ {
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+ blocks[j], blocks[len(blocks)-1-j] = blocks[len(blocks)-1-j], blocks[j]
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+ }
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+ if _, err := bc.InsertChain(blocks); err != nil {
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+ t.Fatalf("failed to import contra-fork chain for expansion: %v", err)
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+ }
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+ blocks, _ = GenerateChain(proConf, conBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
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+ if _, err := conBc.InsertChain(blocks); err == nil {
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+ t.Fatalf("contra-fork chain accepted pro-fork block: %v", blocks[0])
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+ }
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+ // Create a proper no-fork block for the contra-forker
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+ blocks, _ = GenerateChain(conConf, conBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
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+ if _, err := conBc.InsertChain(blocks); err != nil {
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+ t.Fatalf("contra-fork chain didn't accepted no-fork block: %v", err)
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+ }
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+ // Create a no-fork block, and try to feed into the pro-fork chain
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+ db, _ = ethdb.NewMemDatabase()
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+ WriteGenesisBlockForTesting(db)
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+ bc, _ = NewBlockChain(db, proConf, new(FakePow), new(event.TypeMux))
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+
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+ blocks = proBc.GetBlocksFromHash(proBc.CurrentBlock().Hash(), int(proBc.CurrentBlock().NumberU64()+1))
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+ for j := 0; j < len(blocks)/2; j++ {
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+ blocks[j], blocks[len(blocks)-1-j] = blocks[len(blocks)-1-j], blocks[j]
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+ }
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+ if _, err := bc.InsertChain(blocks); err != nil {
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+ t.Fatalf("failed to import pro-fork chain for expansion: %v", err)
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+ }
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+ blocks, _ = GenerateChain(conConf, proBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
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+ if _, err := proBc.InsertChain(blocks); err == nil {
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+ t.Fatalf("pro-fork chain accepted contra-fork block: %v", blocks[0])
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+ }
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+ // Create a proper pro-fork block for the pro-forker
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+ blocks, _ = GenerateChain(proConf, proBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
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+ if _, err := proBc.InsertChain(blocks); err != nil {
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+ t.Fatalf("pro-fork chain didn't accepted pro-fork block: %v", err)
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+ }
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+ }
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+ // Verify that contra-forkers accept pro-fork extra-datas after forking finishes
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+ db, _ = ethdb.NewMemDatabase()
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+ WriteGenesisBlockForTesting(db)
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+ bc, _ := NewBlockChain(db, conConf, new(FakePow), new(event.TypeMux))
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+
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+ blocks := conBc.GetBlocksFromHash(conBc.CurrentBlock().Hash(), int(conBc.CurrentBlock().NumberU64()+1))
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+ for j := 0; j < len(blocks)/2; j++ {
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+ blocks[j], blocks[len(blocks)-1-j] = blocks[len(blocks)-1-j], blocks[j]
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+ }
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+ if _, err := bc.InsertChain(blocks); err != nil {
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+ t.Fatalf("failed to import contra-fork chain for expansion: %v", err)
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+ }
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+ blocks, _ = GenerateChain(proConf, conBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
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+ if _, err := conBc.InsertChain(blocks); err != nil {
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+ t.Fatalf("contra-fork chain didn't accept pro-fork block post-fork: %v", err)
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+ }
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+ // Verify that pro-forkers accept contra-fork extra-datas after forking finishes
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+ db, _ = ethdb.NewMemDatabase()
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+ WriteGenesisBlockForTesting(db)
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+ bc, _ = NewBlockChain(db, proConf, new(FakePow), new(event.TypeMux))
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+
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+ blocks = proBc.GetBlocksFromHash(proBc.CurrentBlock().Hash(), int(proBc.CurrentBlock().NumberU64()+1))
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+ for j := 0; j < len(blocks)/2; j++ {
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+ blocks[j], blocks[len(blocks)-1-j] = blocks[len(blocks)-1-j], blocks[j]
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+ }
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+ if _, err := bc.InsertChain(blocks); err != nil {
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+ t.Fatalf("failed to import pro-fork chain for expansion: %v", err)
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+ }
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+ blocks, _ = GenerateChain(conConf, proBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
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+ if _, err := proBc.InsertChain(blocks); err != nil {
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+ t.Fatalf("pro-fork chain didn't accept contra-fork block post-fork: %v", err)
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+ }
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+}
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Péter Szilágyi