1 files changed, 132 insertions, 0 deletions
diff --git a/core/dao_test.go b/core/dao_test.go
new file mode 100644
index 000000000..0830b1231
--- /dev/null
+++ b/core/dao_test.go
@@ -0,0 +1,132 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/event"
+	"github.com/ethereum/go-ethereum/params"
+)
+
+// Tests that DAO-fork enabled clients can properly filter out fork-commencing
+// blocks based on their extradata fields.
+func TestDAOForkRangeExtradata(t *testing.T) {
+	forkBlock := big.NewInt(32)
+
+	// Generate a common prefix for both pro-forkers and non-forkers
+	db, _ := ethdb.NewMemDatabase()
+	genesis := WriteGenesisBlockForTesting(db)
+	prefix, _ := GenerateChain(nil, genesis, db, int(forkBlock.Int64()-1), func(i int, gen *BlockGen) {})
+
+	// Create the concurrent, conflicting two nodes
+	proDb, _ := ethdb.NewMemDatabase()
+	WriteGenesisBlockForTesting(proDb)
+	proConf := &ChainConfig{HomesteadBlock: big.NewInt(0), DAOForkBlock: forkBlock, DAOForkSupport: true}
+	proBc, _ := NewBlockChain(proDb, proConf, new(FakePow), new(event.TypeMux))
+
+	conDb, _ := ethdb.NewMemDatabase()
+	WriteGenesisBlockForTesting(conDb)
+	conConf := &ChainConfig{HomesteadBlock: big.NewInt(0), DAOForkBlock: forkBlock, DAOForkSupport: false}
+	conBc, _ := NewBlockChain(conDb, conConf, new(FakePow), new(event.TypeMux))
+
+	if _, err := proBc.InsertChain(prefix); err != nil {
+		t.Fatalf("pro-fork: failed to import chain prefix: %v", err)
+	}
+	if _, err := conBc.InsertChain(prefix); err != nil {
+		t.Fatalf("con-fork: failed to import chain prefix: %v", err)
+	}
+	// Try to expand both pro-fork and non-fork chains iteratively with other camp's blocks
+	for i := int64(0); i < params.DAOForkExtraRange.Int64(); i++ {
+		// Create a pro-fork block, and try to feed into the no-fork chain
+		db, _ = ethdb.NewMemDatabase()
+		WriteGenesisBlockForTesting(db)
+		bc, _ := NewBlockChain(db, conConf, new(FakePow), new(event.TypeMux))
+
+		blocks := conBc.GetBlocksFromHash(conBc.CurrentBlock().Hash(), int(conBc.CurrentBlock().NumberU64()+1))
+		for j := 0; j < len(blocks)/2; j++ {
+			blocks[j], blocks[len(blocks)-1-j] = blocks[len(blocks)-1-j], blocks[j]
+		}
+		if _, err := bc.InsertChain(blocks); err != nil {
+			t.Fatalf("failed to import contra-fork chain for expansion: %v", err)
+		}
+		blocks, _ = GenerateChain(proConf, conBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
+		if _, err := conBc.InsertChain(blocks); err == nil {
+			t.Fatalf("contra-fork chain accepted pro-fork block: %v", blocks[0])
+		}
+		// Create a proper no-fork block for the contra-forker
+		blocks, _ = GenerateChain(conConf, conBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
+		if _, err := conBc.InsertChain(blocks); err != nil {
+			t.Fatalf("contra-fork chain didn't accepted no-fork block: %v", err)
+		}
+		// Create a no-fork block, and try to feed into the pro-fork chain
+		db, _ = ethdb.NewMemDatabase()
+		WriteGenesisBlockForTesting(db)
+		bc, _ = NewBlockChain(db, proConf, new(FakePow), new(event.TypeMux))
+
+		blocks = proBc.GetBlocksFromHash(proBc.CurrentBlock().Hash(), int(proBc.CurrentBlock().NumberU64()+1))
+		for j := 0; j < len(blocks)/2; j++ {
+			blocks[j], blocks[len(blocks)-1-j] = blocks[len(blocks)-1-j], blocks[j]
+		}
+		if _, err := bc.InsertChain(blocks); err != nil {
+			t.Fatalf("failed to import pro-fork chain for expansion: %v", err)
+		}
+		blocks, _ = GenerateChain(conConf, proBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
+		if _, err := proBc.InsertChain(blocks); err == nil {
+			t.Fatalf("pro-fork chain accepted contra-fork block: %v", blocks[0])
+		}
+		// Create a proper pro-fork block for the pro-forker
+		blocks, _ = GenerateChain(proConf, proBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
+		if _, err := proBc.InsertChain(blocks); err != nil {
+			t.Fatalf("pro-fork chain didn't accepted pro-fork block: %v", err)
+		}
+	}
+	// Verify that contra-forkers accept pro-fork extra-datas after forking finishes
+	db, _ = ethdb.NewMemDatabase()
+	WriteGenesisBlockForTesting(db)
+	bc, _ := NewBlockChain(db, conConf, new(FakePow), new(event.TypeMux))
+
+	blocks := conBc.GetBlocksFromHash(conBc.CurrentBlock().Hash(), int(conBc.CurrentBlock().NumberU64()+1))
+	for j := 0; j < len(blocks)/2; j++ {
+		blocks[j], blocks[len(blocks)-1-j] = blocks[len(blocks)-1-j], blocks[j]
+	}
+	if _, err := bc.InsertChain(blocks); err != nil {
+		t.Fatalf("failed to import contra-fork chain for expansion: %v", err)
+	}
+	blocks, _ = GenerateChain(proConf, conBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
+	if _, err := conBc.InsertChain(blocks); err != nil {
+		t.Fatalf("contra-fork chain didn't accept pro-fork block post-fork: %v", err)
+	}
+	// Verify that pro-forkers accept contra-fork extra-datas after forking finishes
+	db, _ = ethdb.NewMemDatabase()
+	WriteGenesisBlockForTesting(db)
+	bc, _ = NewBlockChain(db, proConf, new(FakePow), new(event.TypeMux))
+
+	blocks = proBc.GetBlocksFromHash(proBc.CurrentBlock().Hash(), int(proBc.CurrentBlock().NumberU64()+1))
+	for j := 0; j < len(blocks)/2; j++ {
+		blocks[j], blocks[len(blocks)-1-j] = blocks[len(blocks)-1-j], blocks[j]
+	}
+	if _, err := bc.InsertChain(blocks); err != nil {
+		t.Fatalf("failed to import pro-fork chain for expansion: %v", err)
+	}
+	blocks, _ = GenerateChain(conConf, proBc.CurrentBlock(), db, 1, func(i int, gen *BlockGen) {})
+	if _, err := proBc.InsertChain(blocks); err != nil {
+		t.Fatalf("pro-fork chain didn't accept contra-fork block post-fork: %v", err)
+	}
+}