all: swap out the C++ ethash to the pure Go one (mining todo)

10 files changed, 52 insertions, 58 deletions

diff --git a/core/bench_test.go b/core/bench_test.go
index 8a1600557..42d50a7b1 100644
--- a/core/bench_test.go
+++ b/core/bench_test.go
@@ -31,6 +31,7 @@ import (
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/pow"
 )
 
 func BenchmarkInsertChain_empty_memdb(b *testing.B) {
@@ -171,7 +172,7 @@ func benchInsertChain(b *testing.B, disk bool, gen func(int, *BlockGen)) {
 	// Time the insertion of the new chain.
 	// State and blocks are stored in the same DB.
 	evmux := new(event.TypeMux)
-	chainman, _ := NewBlockChain(db, &params.ChainConfig{HomesteadBlock: new(big.Int)}, FakePow{}, evmux, vm.Config{})
+	chainman, _ := NewBlockChain(db, &params.ChainConfig{HomesteadBlock: new(big.Int)}, pow.FakePow{}, evmux, vm.Config{})
 	defer chainman.Stop()
 	b.ReportAllocs()
 	b.ResetTimer()
@@ -281,7 +282,7 @@ func benchReadChain(b *testing.B, full bool, count uint64) {
 		if err != nil {
 			b.Fatalf("error opening database at %v: %v", dir, err)
 		}
-		chain, err := NewBlockChain(db, testChainConfig(), FakePow{}, new(event.TypeMux), vm.Config{})
+		chain, err := NewBlockChain(db, testChainConfig(), pow.FakePow{}, new(event.TypeMux), vm.Config{})
 		if err != nil {
 			b.Fatalf("error creating chain: %v", err)
 		}
diff --git a/core/block_validator.go b/core/block_validator.go
index ed5cc3ab6..f93a9f40b 100644
--- a/core/block_validator.go
+++ b/core/block_validator.go
@@ -244,7 +244,7 @@ func ValidateHeader(config *params.ChainConfig, pow pow.PoW, header *types.Heade
 
 	if checkPow {
 		// Verify the nonce of the header. Return an error if it's not valid
-		if !pow.Verify(types.NewBlockWithHeader(header)) {
+		if err := pow.Verify(types.NewBlockWithHeader(header)); err != nil {
 			return &BlockNonceErr{header.Number, header.Hash(), header.Nonce.Uint64()}
 		}
 	}
diff --git a/core/block_validator_test.go b/core/block_validator_test.go
index 01931efd2..c13aa83db 100644
--- a/core/block_validator_test.go
+++ b/core/block_validator_test.go
@@ -28,6 +28,7 @@ import (
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/pow"
 )
 
 func testChainConfig() *params.ChainConfig {
@@ -40,7 +41,7 @@ func proc() (Validator, *BlockChain) {
 	var mux event.TypeMux
 
 	WriteTestNetGenesisBlock(db)
-	blockchain, err := NewBlockChain(db, testChainConfig(), thePow(), &mux, vm.Config{})
+	blockchain, err := NewBlockChain(db, testChainConfig(), pow.NewTestEthash(), &mux, vm.Config{})
 	if err != nil {
 		fmt.Println(err)
 	}
@@ -54,13 +55,13 @@ func TestNumber(t *testing.T) {
 	cfg := testChainConfig()
 	header := makeHeader(cfg, chain.Genesis(), statedb)
 	header.Number = big.NewInt(3)
-	err := ValidateHeader(cfg, FakePow{}, header, chain.Genesis().Header(), false, false)
+	err := ValidateHeader(cfg, pow.FakePow{}, header, chain.Genesis().Header(), false, false)
 	if err != BlockNumberErr {
 		t.Errorf("expected block number error, got %q", err)
 	}
 
 	header = makeHeader(cfg, chain.Genesis(), statedb)
-	err = ValidateHeader(cfg, FakePow{}, header, chain.Genesis().Header(), false, false)
+	err = ValidateHeader(cfg, pow.FakePow{}, header, chain.Genesis().Header(), false, false)
 	if err == BlockNumberErr {
 		t.Errorf("didn't expect block number error")
 	}
diff --git a/core/blockchain.go b/core/blockchain.go
index 0c752b3f9..765a4b318 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -223,6 +223,9 @@ func (self *BlockChain) loadLastState() error {
 	log.Info("Loaded most recent local full block", "number", self.currentBlock.Number(), "hash", self.currentBlock.Hash(), "td", blockTd)
 	log.Info("Loaded most recent local fast block", "number", self.currentFastBlock.Number(), "hash", self.currentFastBlock.Hash(), "td", fastTd)
 
+	// Try to be smart and issue a pow verification for the head to pre-generate caches
+	go self.pow.Verify(types.NewBlockWithHeader(currentHeader))
+
 	return nil
 }
 
diff --git a/core/blockchain_test.go b/core/blockchain_test.go
index 99b155620..2f06f0735 100644
--- a/core/blockchain_test.go
+++ b/core/blockchain_test.go
@@ -27,7 +27,6 @@ import (
 	"testing"
 	"time"
 
-	"github.com/ethereum/ethash"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -45,15 +44,10 @@ func init() {
 	runtime.GOMAXPROCS(runtime.NumCPU())
 }
 
-func thePow() pow.PoW {
-	pow, _ := ethash.NewForTesting()
-	return pow
-}
-
 func theBlockChain(db ethdb.Database, t *testing.T) *BlockChain {
 	var eventMux event.TypeMux
 	WriteTestNetGenesisBlock(db)
-	blockchain, err := NewBlockChain(db, testChainConfig(), thePow(), &eventMux, vm.Config{})
+	blockchain, err := NewBlockChain(db, testChainConfig(), pow.NewTestEthash(), &eventMux, vm.Config{})
 	if err != nil {
 		t.Error("failed creating blockchain:", err)
 		t.FailNow()
@@ -476,7 +470,7 @@ func chm(genesis *types.Block, db ethdb.Database) *BlockChain {
 		chainDb:      db,
 		genesisBlock: genesis,
 		eventMux:     &eventMux,
-		pow:          FakePow{},
+		pow:          pow.FakePow{},
 		config:       testChainConfig(),
 	}
 	valFn := func() HeaderValidator { return bc.Validator() }
@@ -615,7 +609,7 @@ func testReorgBadHashes(t *testing.T, full bool) {
 		defer func() { delete(BadHashes, headers[3].Hash()) }()
 	}
 	// Create a new chain manager and check it rolled back the state
-	ncm, err := NewBlockChain(db, testChainConfig(), FakePow{}, new(event.TypeMux), vm.Config{})
+	ncm, err := NewBlockChain(db, testChainConfig(), pow.FakePow{}, new(event.TypeMux), vm.Config{})
 	if err != nil {
 		t.Fatalf("failed to create new chain manager: %v", err)
 	}
@@ -736,7 +730,7 @@ func TestFastVsFullChains(t *testing.T) {
 	archiveDb, _ := ethdb.NewMemDatabase()
 	WriteGenesisBlockForTesting(archiveDb, GenesisAccount{address, funds})
 
-	archive, _ := NewBlockChain(archiveDb, testChainConfig(), FakePow{}, new(event.TypeMux), vm.Config{})
+	archive, _ := NewBlockChain(archiveDb, testChainConfig(), pow.FakePow{}, new(event.TypeMux), vm.Config{})
 
 	if n, err := archive.InsertChain(blocks); err != nil {
 		t.Fatalf("failed to process block %d: %v", n, err)
@@ -744,7 +738,7 @@ func TestFastVsFullChains(t *testing.T) {
 	// Fast import the chain as a non-archive node to test
 	fastDb, _ := ethdb.NewMemDatabase()
 	WriteGenesisBlockForTesting(fastDb, GenesisAccount{address, funds})
-	fast, _ := NewBlockChain(fastDb, testChainConfig(), FakePow{}, new(event.TypeMux), vm.Config{})
+	fast, _ := NewBlockChain(fastDb, testChainConfig(), pow.FakePow{}, new(event.TypeMux), vm.Config{})
 
 	headers := make([]*types.Header, len(blocks))
 	for i, block := range blocks {
@@ -820,7 +814,7 @@ func TestLightVsFastVsFullChainHeads(t *testing.T) {
 	archiveDb, _ := ethdb.NewMemDatabase()
 	WriteGenesisBlockForTesting(archiveDb, GenesisAccount{address, funds})
 
-	archive, _ := NewBlockChain(archiveDb, testChainConfig(), FakePow{}, new(event.TypeMux), vm.Config{})
+	archive, _ := NewBlockChain(archiveDb, testChainConfig(), pow.FakePow{}, new(event.TypeMux), vm.Config{})
 
 	if n, err := archive.InsertChain(blocks); err != nil {
 		t.Fatalf("failed to process block %d: %v", n, err)
@@ -832,7 +826,7 @@ func TestLightVsFastVsFullChainHeads(t *testing.T) {
 	// Import the chain as a non-archive node and ensure all pointers are updated
 	fastDb, _ := ethdb.NewMemDatabase()
 	WriteGenesisBlockForTesting(fastDb, GenesisAccount{address, funds})
-	fast, _ := NewBlockChain(fastDb, testChainConfig(), FakePow{}, new(event.TypeMux), vm.Config{})
+	fast, _ := NewBlockChain(fastDb, testChainConfig(), pow.FakePow{}, new(event.TypeMux), vm.Config{})
 
 	headers := make([]*types.Header, len(blocks))
 	for i, block := range blocks {
@@ -851,7 +845,7 @@ func TestLightVsFastVsFullChainHeads(t *testing.T) {
 	// Import the chain as a light node and ensure all pointers are updated
 	lightDb, _ := ethdb.NewMemDatabase()
 	WriteGenesisBlockForTesting(lightDb, GenesisAccount{address, funds})
-	light, _ := NewBlockChain(lightDb, testChainConfig(), FakePow{}, new(event.TypeMux), vm.Config{})
+	light, _ := NewBlockChain(lightDb, testChainConfig(), pow.FakePow{}, new(event.TypeMux), vm.Config{})
 
 	if n, err := light.InsertHeaderChain(headers, 1); err != nil {
 		t.Fatalf("failed to insert header %d: %v", n, err)
@@ -917,7 +911,7 @@ func TestChainTxReorgs(t *testing.T) {
 	})
 	// Import the chain. This runs all block validation rules.
 	evmux := &event.TypeMux{}
-	blockchain, _ := NewBlockChain(db, testChainConfig(), FakePow{}, evmux, vm.Config{})
+	blockchain, _ := NewBlockChain(db, testChainConfig(), pow.FakePow{}, evmux, vm.Config{})
 	if i, err := blockchain.InsertChain(chain); err != nil {
 		t.Fatalf("failed to insert original chain[%d]: %v", i, err)
 	}
@@ -991,7 +985,7 @@ func TestLogReorgs(t *testing.T) {
 	)
 
 	evmux := &event.TypeMux{}
-	blockchain, _ := NewBlockChain(db, testChainConfig(), FakePow{}, evmux, vm.Config{})
+	blockchain, _ := NewBlockChain(db, testChainConfig(), pow.FakePow{}, evmux, vm.Config{})
 
 	subs := evmux.Subscribe(RemovedLogsEvent{})
 	chain, _ := GenerateChain(params.TestChainConfig, genesis, db, 2, func(i int, gen *BlockGen) {
@@ -1028,7 +1022,7 @@ func TestReorgSideEvent(t *testing.T) {
 	)
 
 	evmux := &event.TypeMux{}
-	blockchain, _ := NewBlockChain(db, testChainConfig(), FakePow{}, evmux, vm.Config{})
+	blockchain, _ := NewBlockChain(db, testChainConfig(), pow.FakePow{}, evmux, vm.Config{})
 
 	chain, _ := GenerateChain(params.TestChainConfig, genesis, db, 3, func(i int, gen *BlockGen) {})
 	if _, err := blockchain.InsertChain(chain); err != nil {
@@ -1104,7 +1098,7 @@ func TestCanonicalBlockRetrieval(t *testing.T) {
 	)
 
 	evmux := &event.TypeMux{}
-	blockchain, _ := NewBlockChain(db, testChainConfig(), FakePow{}, evmux, vm.Config{})
+	blockchain, _ := NewBlockChain(db, testChainConfig(), pow.FakePow{}, evmux, vm.Config{})
 
 	chain, _ := GenerateChain(params.TestChainConfig, genesis, db, 10, func(i int, gen *BlockGen) {})
 
@@ -1147,7 +1141,7 @@ func TestEIP155Transition(t *testing.T) {
 		mux        event.TypeMux
 	)
 
-	blockchain, _ := NewBlockChain(db, config, FakePow{}, &mux, vm.Config{})
+	blockchain, _ := NewBlockChain(db, config, pow.FakePow{}, &mux, vm.Config{})
 	blocks, _ := GenerateChain(config, genesis, db, 4, func(i int, block *BlockGen) {
 		var (
 			tx      *types.Transaction
@@ -1251,7 +1245,7 @@ func TestEIP161AccountRemoval(t *testing.T) {
 		}
 		mux event.TypeMux
 
-		blockchain, _ = NewBlockChain(db, config, FakePow{}, &mux, vm.Config{})
+		blockchain, _ = NewBlockChain(db, config, pow.FakePow{}, &mux, vm.Config{})
 	)
 	blocks, _ := GenerateChain(config, genesis, db, 3, func(i int, block *BlockGen) {
 		var (
diff --git a/core/chain_makers.go b/core/chain_makers.go
index 8b3b015a8..f63496fdc 100644
--- a/core/chain_makers.go
+++ b/core/chain_makers.go
@@ -43,17 +43,6 @@ func MakeChainConfig() *params.ChainConfig {
 	}
 }
 
-// FakePow is a non-validating proof of work implementation.
-// It returns true from Verify for any block.
-type FakePow struct{}
-
-func (f FakePow) Search(block pow.Block, stop <-chan struct{}, index int) (uint64, []byte) {
-	return 0, nil
-}
-func (f FakePow) Verify(block pow.Block) bool { return true }
-func (f FakePow) GetHashrate() int64          { return 0 }
-func (f FakePow) Turbo(bool)                  {}
-
 // So we can deterministically seed different blockchains
 var (
 	canonicalSeed = 1
@@ -256,7 +245,7 @@ func newCanonical(n int, full bool) (ethdb.Database, *BlockChain, error) {
 	// Initialize a fresh chain with only a genesis block
 	genesis, _ := WriteTestNetGenesisBlock(db)
 
-	blockchain, _ := NewBlockChain(db, MakeChainConfig(), FakePow{}, evmux, vm.Config{})
+	blockchain, _ := NewBlockChain(db, MakeChainConfig(), pow.FakePow{}, evmux, vm.Config{})
 	// Create and inject the requested chain
 	if n == 0 {
 		return db, blockchain, nil
diff --git a/core/chain_makers_test.go b/core/chain_makers_test.go
index 5c563de46..82751553f 100644
--- a/core/chain_makers_test.go
+++ b/core/chain_makers_test.go
@@ -26,6 +26,7 @@ import (
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/pow"
 )
 
 func ExampleGenerateChain() {
@@ -82,7 +83,7 @@ func ExampleGenerateChain() {
 
 	// Import the chain. This runs all block validation rules.
 	evmux := &event.TypeMux{}
-	blockchain, _ := NewBlockChain(db, chainConfig, FakePow{}, evmux, vm.Config{})
+	blockchain, _ := NewBlockChain(db, chainConfig, pow.FakePow{}, evmux, vm.Config{})
 	if i, err := blockchain.InsertChain(chain); err != nil {
 		fmt.Printf("insert error (block %d): %v\n", chain[i].NumberU64(), err)
 		return
diff --git a/core/chain_pow.go b/core/chain_pow.go
index c3b5788c1..e5ccd87e2 100644
--- a/core/chain_pow.go
+++ b/core/chain_pow.go
@@ -65,7 +65,7 @@ func verifyNonces(checker pow.PoW, items []pow.Block) (chan<- struct{}, <-chan n
 	for i := 0; i < workers; i++ {
 		go func() {
 			for index := range tasks {
-				results <- nonceCheckResult{index: index, valid: checker.Verify(items[index])}
+				results <- nonceCheckResult{index: index, valid: checker.Verify(items[index]) == nil}
 			}
 		}()
 	}
diff --git a/core/chain_pow_test.go b/core/chain_pow_test.go
index 1400b166f..311ca128e 100644
--- a/core/chain_pow_test.go
+++ b/core/chain_pow_test.go
@@ -17,6 +17,7 @@
 package core
 
 import (
+	"errors"
 	"math/big"
 	"runtime"
 	"testing"
@@ -35,12 +36,16 @@ type failPow struct {
 	failing uint64
 }
 
-func (pow failPow) Search(pow.Block, <-chan struct{}, int) (uint64, []byte) {
+func (pow failPow) Search(pow.Block, <-chan struct{}) (uint64, []byte) {
 	return 0, nil
 }
-func (pow failPow) Verify(block pow.Block) bool { return block.NumberU64() != pow.failing }
-func (pow failPow) GetHashrate() int64          { return 0 }
-func (pow failPow) Turbo(bool)                  {}
+func (pow failPow) Verify(block pow.Block) error {
+	if block.NumberU64() == pow.failing {
+		return errors.New("failed")
+	}
+	return nil
+}
+func (pow failPow) Hashrate() float64 { return 0 }
 
 // delayedPow is a non-validating proof of work implementation, that returns true
 // from Verify for all blocks, but delays them the configured amount of time.
@@ -48,12 +53,11 @@ type delayedPow struct {
 	delay time.Duration
 }
 
-func (pow delayedPow) Search(pow.Block, <-chan struct{}, int) (uint64, []byte) {
+func (pow delayedPow) Search(pow.Block, <-chan struct{}) (uint64, []byte) {
 	return 0, nil
 }
-func (pow delayedPow) Verify(block pow.Block) bool { time.Sleep(pow.delay); return true }
-func (pow delayedPow) GetHashrate() int64          { return 0 }
-func (pow delayedPow) Turbo(bool)                  {}
+func (pow delayedPow) Verify(block pow.Block) error { time.Sleep(pow.delay); return nil }
+func (pow delayedPow) Hashrate() float64            { return 0 }
 
 // Tests that simple POW verification works, for both good and bad blocks.
 func TestPowVerification(t *testing.T) {
@@ -75,11 +79,11 @@ func TestPowVerification(t *testing.T) {
 
 				switch {
 				case full && valid:
-					_, results = verifyNoncesFromBlocks(FakePow{}, []*types.Block{blocks[i]})
+					_, results = verifyNoncesFromBlocks(pow.FakePow{}, []*types.Block{blocks[i]})
 				case full && !valid:
 					_, results = verifyNoncesFromBlocks(failPow{blocks[i].NumberU64()}, []*types.Block{blocks[i]})
 				case !full && valid:
-					_, results = verifyNoncesFromHeaders(FakePow{}, []*types.Header{headers[i]})
+					_, results = verifyNoncesFromHeaders(pow.FakePow{}, []*types.Header{headers[i]})
 				case !full && !valid:
 					_, results = verifyNoncesFromHeaders(failPow{headers[i].Number.Uint64()}, []*types.Header{headers[i]})
 				}
@@ -134,11 +138,11 @@ func testPowConcurrentVerification(t *testing.T, threads int) {
 
 			switch {
 			case full && valid:
-				_, results = verifyNoncesFromBlocks(FakePow{}, blocks)
+				_, results = verifyNoncesFromBlocks(pow.FakePow{}, blocks)
 			case full && !valid:
 				_, results = verifyNoncesFromBlocks(failPow{uint64(len(blocks) - 1)}, blocks)
 			case !full && valid:
-				_, results = verifyNoncesFromHeaders(FakePow{}, headers)
+				_, results = verifyNoncesFromHeaders(pow.FakePow{}, headers)
 			case !full && !valid:
 				_, results = verifyNoncesFromHeaders(failPow{uint64(len(headers) - 1)}, headers)
 			}
diff --git a/core/dao_test.go b/core/dao_test.go
index b8b4c71cf..45b3235c7 100644
--- a/core/dao_test.go
+++ b/core/dao_test.go
@@ -24,6 +24,7 @@ import (
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/pow"
 )
 
 // Tests that DAO-fork enabled clients can properly filter out fork-commencing
@@ -40,12 +41,12 @@ func TestDAOForkRangeExtradata(t *testing.T) {
 	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), vm.Config{})
+	proBc, _ := NewBlockChain(proDb, proConf, new(pow.FakePow), new(event.TypeMux), vm.Config{})
 
 	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), vm.Config{})
+	conBc, _ := NewBlockChain(conDb, conConf, new(pow.FakePow), new(event.TypeMux), vm.Config{})
 
 	if _, err := proBc.InsertChain(prefix); err != nil {
 		t.Fatalf("pro-fork: failed to import chain prefix: %v", err)
@@ -58,7 +59,7 @@ func TestDAOForkRangeExtradata(t *testing.T) {
 		// 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), vm.Config{})
+		bc, _ := NewBlockChain(db, conConf, new(pow.FakePow), new(event.TypeMux), vm.Config{})
 
 		blocks := conBc.GetBlocksFromHash(conBc.CurrentBlock().Hash(), int(conBc.CurrentBlock().NumberU64()+1))
 		for j := 0; j < len(blocks)/2; j++ {
@@ -79,7 +80,7 @@ func TestDAOForkRangeExtradata(t *testing.T) {
 		// 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), vm.Config{})
+		bc, _ = NewBlockChain(db, proConf, new(pow.FakePow), new(event.TypeMux), vm.Config{})
 
 		blocks = proBc.GetBlocksFromHash(proBc.CurrentBlock().Hash(), int(proBc.CurrentBlock().NumberU64()+1))
 		for j := 0; j < len(blocks)/2; j++ {
@@ -101,7 +102,7 @@ func TestDAOForkRangeExtradata(t *testing.T) {
 	// 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), vm.Config{})
+	bc, _ := NewBlockChain(db, conConf, new(pow.FakePow), new(event.TypeMux), vm.Config{})
 
 	blocks := conBc.GetBlocksFromHash(conBc.CurrentBlock().Hash(), int(conBc.CurrentBlock().NumberU64()+1))
 	for j := 0; j < len(blocks)/2; j++ {
@@ -117,7 +118,7 @@ func TestDAOForkRangeExtradata(t *testing.T) {
 	// 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), vm.Config{})
+	bc, _ = NewBlockChain(db, proConf, new(pow.FakePow), new(event.TypeMux), vm.Config{})
 
 	blocks = proBc.GetBlocksFromHash(proBc.CurrentBlock().Hash(), int(proBc.CurrentBlock().NumberU64()+1))
 	for j := 0; j < len(blocks)/2; j++ {