path: root/core/dao_test.go

// 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(params.TestChainConfig, genesis, db, int(forkBlock.Int64()-1), func(i int, gen *BlockGen) {})

    // Create the concurrent, conflicting two nodes
    proDb, _ := ethdb.NewMemDatabase()
    WriteGenesisBlockForTesting(proDb)
    proConf := &params.ChainConfig{HomesteadBlock: big.NewInt(0), DAOForkBlock: forkBlock, DAOForkSupport: true}
    proBc, _ := NewBlockChain(proDb, proConf, new(FakePow), new(event.TypeMux))

    conDb, _ := ethdb.NewMemDatabase()
    WriteGenesisBlockForTesting(conDb)
    conConf := &params.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)
    }
}