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consensus, miner: stale block mining support (#17506)

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* consensus, miner: stale block supporting

* consensus, miner: refactor seal signature

* cmd, consensus, eth: add miner noverify flag

* cmd, consensus, miner: polish
This commit is contained in:
gary rong
2018-08-28 21:59:05 +08:00
committed by Péter Szilágyi
parent 63352bf424
commit c1c003e4ff
16 changed files with 317 additions and 183 deletions
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39
consensus/clique/clique.go
View File

@ -590,17 +590,17 @@ func (c *Clique) Authorize(signer common.Address, signFn SignerFn) {
// Seal implements consensus.Engine, attempting to create a sealed block using
// the local signing credentials.
func (c *Clique) Seal(chain consensus.ChainReader, block *types.Block, stop <-chan struct{}) (*types.Block, error) {
func (c *Clique) Seal(chain consensus.ChainReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error {
header := block.Header()
// Sealing the genesis block is not supported
number := header.Number.Uint64()
if number == 0 {
return nil, errUnknownBlock
return errUnknownBlock
}
// For 0-period chains, refuse to seal empty blocks (no reward but would spin sealing)
if c.config.Period == 0 && len(block.Transactions()) == 0 {
return nil, errWaitTransactions
return errWaitTransactions
}
// Don't hold the signer fields for the entire sealing procedure
c.lock.RLock()
@ -610,10 +610,10 @@ func (c *Clique) Seal(chain consensus.ChainReader, block *types.Block, stop <-ch
// Bail out if we're unauthorized to sign a block
snap, err := c.snapshot(chain, number-1, header.ParentHash, nil)
if err != nil {
return nil, err
return err
}
if _, authorized := snap.Signers[signer]; !authorized {
return nil, errUnauthorized
return errUnauthorized
}
// If we're amongst the recent signers, wait for the next block
for seen, recent := range snap.Recents {
@ -621,8 +621,7 @@ func (c *Clique) Seal(chain consensus.ChainReader, block *types.Block, stop <-ch
// Signer is among recents, only wait if the current block doesn't shift it out
if limit := uint64(len(snap.Signers)/2 + 1); number < limit || seen > number-limit {
log.Info("Signed recently, must wait for others")
<-stop
return nil, nil
return nil
}
}
}
@ -635,21 +634,29 @@ func (c *Clique) Seal(chain consensus.ChainReader, block *types.Block, stop <-ch
log.Trace("Out-of-turn signing requested", "wiggle", common.PrettyDuration(wiggle))
}
log.Trace("Waiting for slot to sign and propagate", "delay", common.PrettyDuration(delay))
select {
case <-stop:
return nil, nil
case <-time.After(delay):
}
// Sign all the things!
sighash, err := signFn(accounts.Account{Address: signer}, sigHash(header).Bytes())
if err != nil {
return nil, err
return err
}
copy(header.Extra[len(header.Extra)-extraSeal:], sighash)
// Wait until sealing is terminated or delay timeout.
log.Trace("Waiting for slot to sign and propagate", "delay", common.PrettyDuration(delay))
go func() {
select {
case <-stop:
return
case <-time.After(delay):
}
return block.WithSeal(header), nil
select {
case results <- block.WithSeal(header):
default:
log.Warn("Sealing result is not read by miner", "sealhash", c.SealHash(header))
}
}()
return nil
}
// CalcDifficulty is the difficulty adjustment algorithm. It returns the difficulty

9
consensus/consensus.go
View File

@ -86,9 +86,12 @@ type Engine interface {
Finalize(chain ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction,
uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error)
// Seal generates a new block for the given input block with the local miner's
// seal place on top.
Seal(chain ChainReader, block *types.Block, stop <-chan struct{}) (*types.Block, error)
// Seal generates a new sealing request for the given input block and pushes
// the result into the given channel.
//
// Note, the method returns immediately and will send the result async. More
// than one result may also be returned depending on the consensus algorothm.
Seal(chain ChainReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error
// SealHash returns the hash of a block prior to it being sealed.
SealHash(header *types.Header) common.Hash

2
consensus/ethash/algorithm_test.go
View File

@ -729,7 +729,7 @@ func TestConcurrentDiskCacheGeneration(t *testing.T) {
go func(idx int) {
defer pend.Done()
ethash := New(Config{cachedir, 0, 1, "", 0, 0, ModeNormal}, nil)
ethash := New(Config{cachedir, 0, 1, "", 0, 0, ModeNormal}, nil, false)
defer ethash.Close()
if err := ethash.VerifySeal(nil, block.Header()); err != nil {
t.Errorf("proc %d: block verification failed: %v", idx, err)

33
consensus/ethash/ethash.go
View File

@ -50,7 +50,7 @@ var (
two256 = new(big.Int).Exp(big.NewInt(2), big.NewInt(256), big.NewInt(0))
// sharedEthash is a full instance that can be shared between multiple users.
sharedEthash = New(Config{"", 3, 0, "", 1, 0, ModeNormal}, nil)
sharedEthash = New(Config{"", 3, 0, "", 1, 0, ModeNormal}, nil, false)
// algorithmRevision is the data structure version used for file naming.
algorithmRevision = 23
@ -405,6 +405,12 @@ type Config struct {
PowMode Mode
}
// sealTask wraps a seal block with relative result channel for remote sealer thread.
type sealTask struct {
block *types.Block
results chan<- *types.Block
}
// mineResult wraps the pow solution parameters for the specified block.
type mineResult struct {
nonce types.BlockNonce
@ -444,12 +450,11 @@ type Ethash struct {
hashrate metrics.Meter // Meter tracking the average hashrate
// Remote sealer related fields
workCh chan *types.Block // Notification channel to push new work to remote sealer
resultCh chan *types.Block // Channel used by mining threads to return result
fetchWorkCh chan *sealWork // Channel used for remote sealer to fetch mining work
submitWorkCh chan *mineResult // Channel used for remote sealer to submit their mining result
fetchRateCh chan chan uint64 // Channel used to gather submitted hash rate for local or remote sealer.
submitRateCh chan *hashrate // Channel used for remote sealer to submit their mining hashrate
workCh chan *sealTask // Notification channel to push new work and relative result channel to remote sealer
fetchWorkCh chan *sealWork // Channel used for remote sealer to fetch mining work
submitWorkCh chan *mineResult // Channel used for remote sealer to submit their mining result
fetchRateCh chan chan uint64 // Channel used to gather submitted hash rate for local or remote sealer.
submitRateCh chan *hashrate // Channel used for remote sealer to submit their mining hashrate
// The fields below are hooks for testing
shared *Ethash // Shared PoW verifier to avoid cache regeneration
@ -464,7 +469,7 @@ type Ethash struct {
// New creates a full sized ethash PoW scheme and starts a background thread for
// remote mining, also optionally notifying a batch of remote services of new work
// packages.
func New(config Config, notify []string) *Ethash {
func New(config Config, notify []string, noverify bool) *Ethash {
if config.CachesInMem <= 0 {
log.Warn("One ethash cache must always be in memory", "requested", config.CachesInMem)
config.CachesInMem = 1
@ -481,36 +486,34 @@ func New(config Config, notify []string) *Ethash {
datasets: newlru("dataset", config.DatasetsInMem, newDataset),
update: make(chan struct{}),
hashrate: metrics.NewMeter(),
workCh: make(chan *types.Block),
resultCh: make(chan *types.Block),
workCh: make(chan *sealTask),
fetchWorkCh: make(chan *sealWork),
submitWorkCh: make(chan *mineResult),
fetchRateCh: make(chan chan uint64),
submitRateCh: make(chan *hashrate),
exitCh: make(chan chan error),
}
go ethash.remote(notify)
go ethash.remote(notify, noverify)
return ethash
}
// NewTester creates a small sized ethash PoW scheme useful only for testing
// purposes.
func NewTester(notify []string) *Ethash {
func NewTester(notify []string, noverify bool) *Ethash {
ethash := &Ethash{
config: Config{PowMode: ModeTest},
caches: newlru("cache", 1, newCache),
datasets: newlru("dataset", 1, newDataset),
update: make(chan struct{}),
hashrate: metrics.NewMeter(),
workCh: make(chan *types.Block),
resultCh: make(chan *types.Block),
workCh: make(chan *sealTask),
fetchWorkCh: make(chan *sealWork),
submitWorkCh: make(chan *mineResult),
fetchRateCh: make(chan chan uint64),
submitRateCh: make(chan *hashrate),
exitCh: make(chan chan error),
}
go ethash.remote(notify)
go ethash.remote(notify, noverify)
return ethash
}

40
consensus/ethash/ethash_test.go
View File

@ -34,17 +34,23 @@ import (
func TestTestMode(t *testing.T) {
header := &types.Header{Number: big.NewInt(1), Difficulty: big.NewInt(100)}
ethash := NewTester(nil)
ethash := NewTester(nil, false)
defer ethash.Close()
block, err := ethash.Seal(nil, types.NewBlockWithHeader(header), nil)
results := make(chan *types.Block)
err := ethash.Seal(nil, types.NewBlockWithHeader(header), results, nil)
if err != nil {
t.Fatalf("failed to seal block: %v", err)
}
header.Nonce = types.EncodeNonce(block.Nonce())
header.MixDigest = block.MixDigest()
if err := ethash.VerifySeal(nil, header); err != nil {
t.Fatalf("unexpected verification error: %v", err)
select {
case block := <-results:
header.Nonce = types.EncodeNonce(block.Nonce())
header.MixDigest = block.MixDigest()
if err := ethash.VerifySeal(nil, header); err != nil {
t.Fatalf("unexpected verification error: %v", err)
}
case <-time.NewTimer(time.Second).C:
t.Error("sealing result timeout")
}
}
@ -56,7 +62,7 @@ func TestCacheFileEvict(t *testing.T) {
t.Fatal(err)
}
defer os.RemoveAll(tmpdir)
e := New(Config{CachesInMem: 3, CachesOnDisk: 10, CacheDir: tmpdir, PowMode: ModeTest}, nil)
e := New(Config{CachesInMem: 3, CachesOnDisk: 10, CacheDir: tmpdir, PowMode: ModeTest}, nil, false)
defer e.Close()
workers := 8
@ -85,7 +91,7 @@ func verifyTest(wg *sync.WaitGroup, e *Ethash, workerIndex, epochs int) {
}
func TestRemoteSealer(t *testing.T) {
ethash := NewTester(nil)
ethash := NewTester(nil, false)
defer ethash.Close()
api := &API{ethash}
@ -97,7 +103,8 @@ func TestRemoteSealer(t *testing.T) {
sealhash := ethash.SealHash(header)
// Push new work.
ethash.Seal(nil, block, nil)
results := make(chan *types.Block)
ethash.Seal(nil, block, results, nil)
var (
work [3]string
@ -114,20 +121,11 @@ func TestRemoteSealer(t *testing.T) {
header = &types.Header{Number: big.NewInt(1), Difficulty: big.NewInt(1000)}
block = types.NewBlockWithHeader(header)
sealhash = ethash.SealHash(header)
ethash.Seal(nil, block, nil)
ethash.Seal(nil, block, results, nil)
if work, err = api.GetWork(); err != nil || work[0] != sealhash.Hex() {
t.Error("expect to return the latest pushed work")
}
// Push block with higher block number.
newHead := &types.Header{Number: big.NewInt(2), Difficulty: big.NewInt(100)}
newBlock := types.NewBlockWithHeader(newHead)
newSealhash := ethash.SealHash(newHead)
ethash.Seal(nil, newBlock, nil)
if res := api.SubmitWork(types.BlockNonce{}, newSealhash, common.Hash{}); res {
t.Error("expect to return false when submit a stale solution")
}
}
func TestHashRate(t *testing.T) {
@ -136,7 +134,7 @@ func TestHashRate(t *testing.T) {
expect uint64
ids = []common.Hash{common.HexToHash("a"), common.HexToHash("b"), common.HexToHash("c")}
)
ethash := NewTester(nil)
ethash := NewTester(nil, false)
defer ethash.Close()
if tot := ethash.Hashrate(); tot != 0 {
@ -156,7 +154,7 @@ func TestHashRate(t *testing.T) {
}
func TestClosedRemoteSealer(t *testing.T) {
ethash := NewTester(nil)
ethash := NewTester(nil, false)
time.Sleep(1 * time.Second) // ensure exit channel is listening
ethash.Close()

134
consensus/ethash/sealer.go
View File

@ -35,6 +35,11 @@ import (
"github.com/ethereum/go-ethereum/log"
)
const (
// staleThreshold is the maximum depth of the acceptable stale but valid ethash solution.
staleThreshold = 7
)
var (
errNoMiningWork = errors.New("no mining work available yet")
errInvalidSealResult = errors.New("invalid or stale proof-of-work solution")
@ -42,16 +47,21 @@ var (
// Seal implements consensus.Engine, attempting to find a nonce that satisfies
// the block's difficulty requirements.
func (ethash *Ethash) Seal(chain consensus.ChainReader, block *types.Block, stop <-chan struct{}) (*types.Block, error) {
func (ethash *Ethash) Seal(chain consensus.ChainReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error {
// If we're running a fake PoW, simply return a 0 nonce immediately
if ethash.config.PowMode == ModeFake || ethash.config.PowMode == ModeFullFake {
header := block.Header()
header.Nonce, header.MixDigest = types.BlockNonce{}, common.Hash{}
return block.WithSeal(header), nil
select {
case results <- block.WithSeal(header):
default:
log.Warn("Sealing result is not read by miner", "mode", "fake", "sealhash", ethash.SealHash(block.Header()))
}
return nil
}
// If we're running a shared PoW, delegate sealing to it
if ethash.shared != nil {
return ethash.shared.Seal(chain, block, stop)
return ethash.shared.Seal(chain, block, results, stop)
}
// Create a runner and the multiple search threads it directs
abort := make(chan struct{})
@ -62,7 +72,7 @@ func (ethash *Ethash) Seal(chain consensus.ChainReader, block *types.Block, stop
seed, err := crand.Int(crand.Reader, big.NewInt(math.MaxInt64))
if err != nil {
ethash.lock.Unlock()
return nil, err
return err
}
ethash.rand = rand.New(rand.NewSource(seed.Int64()))
}
@ -75,34 +85,45 @@ func (ethash *Ethash) Seal(chain consensus.ChainReader, block *types.Block, stop
}
// Push new work to remote sealer
if ethash.workCh != nil {
ethash.workCh <- block
ethash.workCh <- &sealTask{block: block, results: results}
}
var pend sync.WaitGroup
var (
pend sync.WaitGroup
locals = make(chan *types.Block)
)
for i := 0; i < threads; i++ {
pend.Add(1)
go func(id int, nonce uint64) {
defer pend.Done()
ethash.mine(block, id, nonce, abort, ethash.resultCh)
ethash.mine(block, id, nonce, abort, locals)
}(i, uint64(ethash.rand.Int63()))
}
// Wait until sealing is terminated or a nonce is found
var result *types.Block
select {
case <-stop:
// Outside abort, stop all miner threads
close(abort)
case result = <-ethash.resultCh:
// One of the threads found a block, abort all others
close(abort)
case <-ethash.update:
// Thread count was changed on user request, restart
close(abort)
go func() {
var result *types.Block
select {
case <-stop:
// Outside abort, stop all miner threads
close(abort)
case result = <-locals:
// One of the threads found a block, abort all others
select {
case results <- result:
default:
log.Warn("Sealing result is not read by miner", "mode", "local", "sealhash", ethash.SealHash(block.Header()))
}
close(abort)
case <-ethash.update:
// Thread count was changed on user request, restart
close(abort)
if err := ethash.Seal(chain, block, results, stop); err != nil {
log.Error("Failed to restart sealing after update", "err", err)
}
}
// Wait for all miners to terminate and return the block
pend.Wait()
return ethash.Seal(chain, block, stop)
}
// Wait for all miners to terminate and return the block
pend.Wait()
return result, nil
}()
return nil
}
// mine is the actual proof-of-work miner that searches for a nonce starting from
@ -165,11 +186,12 @@ search:
}
// remote is a standalone goroutine to handle remote mining related stuff.
func (ethash *Ethash) remote(notify []string) {
func (ethash *Ethash) remote(notify []string, noverify bool) {
var (
works = make(map[common.Hash]*types.Block)
rates = make(map[common.Hash]hashrate)
results chan<- *types.Block
currentBlock *types.Block
currentWork [3]string
@ -226,11 +248,15 @@ func (ethash *Ethash) remote(notify []string) {
// submitWork verifies the submitted pow solution, returning
// whether the solution was accepted or not (not can be both a bad pow as well as
// any other error, like no pending work or stale mining result).
submitWork := func(nonce types.BlockNonce, mixDigest common.Hash, hash common.Hash) bool {
submitWork := func(nonce types.BlockNonce, mixDigest common.Hash, sealhash common.Hash) bool {
if currentBlock == nil {
log.Error("Pending work without block", "sealhash", sealhash)
return false
}
// Make sure the work submitted is present
block := works[hash]
block := works[sealhash]
if block == nil {
log.Info("Work submitted but none pending", "hash", hash)
log.Warn("Work submitted but none pending", "sealhash", sealhash, "curnumber", currentBlock.NumberU64())
return false
}
// Verify the correctness of submitted result.
@ -239,26 +265,36 @@ func (ethash *Ethash) remote(notify []string) {
header.MixDigest = mixDigest
start := time.Now()
if err := ethash.verifySeal(nil, header, true); err != nil {
log.Warn("Invalid proof-of-work submitted", "hash", hash, "elapsed", time.Since(start), "err", err)
return false
if !noverify {
if err := ethash.verifySeal(nil, header, true); err != nil {
log.Warn("Invalid proof-of-work submitted", "sealhash", sealhash, "elapsed", time.Since(start), "err", err)
return false
}
}
// Make sure the result channel is created.
if ethash.resultCh == nil {
// Make sure the result channel is assigned.
if results == nil {
log.Warn("Ethash result channel is empty, submitted mining result is rejected")
return false
}
log.Trace("Verified correct proof-of-work", "hash", hash, "elapsed", time.Since(start))
log.Trace("Verified correct proof-of-work", "sealhash", sealhash, "elapsed", time.Since(start))
// Solutions seems to be valid, return to the miner and notify acceptance.
select {
case ethash.resultCh <- block.WithSeal(header):
delete(works, hash)
return true
default:
log.Info("Work submitted is stale", "hash", hash)
return false
solution := block.WithSeal(header)
// The submitted solution is within the scope of acceptance.
if solution.NumberU64()+staleThreshold > currentBlock.NumberU64() {
select {
case results <- solution:
log.Debug("Work submitted is acceptable", "number", solution.NumberU64(), "sealhash", sealhash, "hash", solution.Hash())
return true
default:
log.Warn("Sealing result is not read by miner", "mode", "remote", "sealhash", sealhash)
return false
}
}
// The submitted block is too old to accept, drop it.
log.Warn("Work submitted is too old", "number", solution.NumberU64(), "sealhash", sealhash, "hash", solution.Hash())
return false
}
ticker := time.NewTicker(5 * time.Second)
@ -266,14 +302,12 @@ func (ethash *Ethash) remote(notify []string) {
for {
select {
case block := <-ethash.workCh:
if currentBlock != nil && block.ParentHash() != currentBlock.ParentHash() {
// Start new round mining, throw out all previous work.
works = make(map[common.Hash]*types.Block)
}
case work := <-ethash.workCh:
// Update current work with new received block.
// Note same work can be past twice, happens when changing CPU threads.
makeWork(block)
results = work.results
makeWork(work.block)
// Notify and requested URLs of the new work availability
notifyWork()
@ -315,6 +349,14 @@ func (ethash *Ethash) remote(notify []string) {
delete(rates, id)
}
}
// Clear stale pending blocks
if currentBlock != nil {
for hash, block := range works {
if block.NumberU64()+staleThreshold <= currentBlock.NumberU64() {
delete(works, hash)
}
}
}
case errc := <-ethash.exitCh:
// Exit remote loop if ethash is closed and return relevant error.

94
consensus/ethash/sealer_test.go
View File

@ -41,14 +41,14 @@ func TestRemoteNotify(t *testing.T) {
go server.Serve(listener)
// Create the custom ethash engine
ethash := NewTester([]string{"http://" + listener.Addr().String()})
ethash := NewTester([]string{"http://" + listener.Addr().String()}, false)
defer ethash.Close()
// Stream a work task and ensure the notification bubbles out
header := &types.Header{Number: big.NewInt(1), Difficulty: big.NewInt(100)}
block := types.NewBlockWithHeader(header)
ethash.Seal(nil, block, nil)
ethash.Seal(nil, block, nil, nil)
select {
case work := <-sink:
if want := ethash.SealHash(header).Hex(); work[0] != want {
@ -66,7 +66,7 @@ func TestRemoteNotify(t *testing.T) {
}
}
// Tests that pushing work packages fast to the miner doesn't cause any daa race
// Tests that pushing work packages fast to the miner doesn't cause any data race
// issues in the notifications.
func TestRemoteMultiNotify(t *testing.T) {
// Start a simple webserver to capture notifications
@ -95,7 +95,7 @@ func TestRemoteMultiNotify(t *testing.T) {
go server.Serve(listener)
// Create the custom ethash engine
ethash := NewTester([]string{"http://" + listener.Addr().String()})
ethash := NewTester([]string{"http://" + listener.Addr().String()}, false)
defer ethash.Close()
// Stream a lot of work task and ensure all the notifications bubble out
@ -103,7 +103,7 @@ func TestRemoteMultiNotify(t *testing.T) {
header := &types.Header{Number: big.NewInt(int64(i)), Difficulty: big.NewInt(100)}
block := types.NewBlockWithHeader(header)
ethash.Seal(nil, block, nil)
ethash.Seal(nil, block, nil, nil)
}
for i := 0; i < cap(sink); i++ {
select {
@ -113,3 +113,87 @@ func TestRemoteMultiNotify(t *testing.T) {
}
}
}
// Tests whether stale solutions are correctly processed.
func TestStaleSubmission(t *testing.T) {
ethash := NewTester(nil, true)
defer ethash.Close()
api := &API{ethash}
fakeNonce, fakeDigest := types.BlockNonce{0x01, 0x02, 0x03}, common.HexToHash("deadbeef")
testcases := []struct {
headers []*types.Header
submitIndex int
submitRes bool
}{
// Case1: submit solution for the latest mining package
{
[]*types.Header{
{ParentHash: common.BytesToHash([]byte{0xa}), Number: big.NewInt(1), Difficulty: big.NewInt(100000000)},
},
0,
true,
},
// Case2: submit solution for the previous package but have same parent.
{
[]*types.Header{
{ParentHash: common.BytesToHash([]byte{0xb}), Number: big.NewInt(2), Difficulty: big.NewInt(100000000)},
{ParentHash: common.BytesToHash([]byte{0xb}), Number: big.NewInt(2), Difficulty: big.NewInt(100000001)},
},
0,
true,
},
// Case3: submit stale but acceptable solution
{
[]*types.Header{
{ParentHash: common.BytesToHash([]byte{0xc}), Number: big.NewInt(3), Difficulty: big.NewInt(100000000)},
{ParentHash: common.BytesToHash([]byte{0xd}), Number: big.NewInt(9), Difficulty: big.NewInt(100000000)},
},
0,
true,
},
// Case4: submit very old solution
{
[]*types.Header{
{ParentHash: common.BytesToHash([]byte{0xe}), Number: big.NewInt(10), Difficulty: big.NewInt(100000000)},
{ParentHash: common.BytesToHash([]byte{0xf}), Number: big.NewInt(17), Difficulty: big.NewInt(100000000)},
},
0,
false,
},
}
results := make(chan *types.Block, 16)
for id, c := range testcases {
for _, h := range c.headers {
ethash.Seal(nil, types.NewBlockWithHeader(h), results, nil)
}
if res := api.SubmitWork(fakeNonce, ethash.SealHash(c.headers[c.submitIndex]), fakeDigest); res != c.submitRes {
t.Errorf("case %d submit result mismatch, want %t, get %t", id+1, c.submitRes, res)
}
if !c.submitRes {
continue
}
select {
case res := <-results:
if res.Header().Nonce != fakeNonce {
t.Errorf("case %d block nonce mismatch, want %s, get %s", id+1, fakeNonce, res.Header().Nonce)
}
if res.Header().MixDigest != fakeDigest {
t.Errorf("case %d block digest mismatch, want %s, get %s", id+1, fakeDigest, res.Header().MixDigest)
}
if res.Header().Difficulty.Uint64() != c.headers[c.submitIndex].Difficulty.Uint64() {
t.Errorf("case %d block difficulty mismatch, want %d, get %d", id+1, c.headers[c.submitIndex].Difficulty, res.Header().Difficulty)
}
if res.Header().Number.Uint64() != c.headers[c.submitIndex].Number.Uint64() {
t.Errorf("case %d block number mismatch, want %d, get %d", id+1, c.headers[c.submitIndex].Number.Uint64(), res.Header().Number.Uint64())
}
if res.Header().ParentHash != c.headers[c.submitIndex].ParentHash {
t.Errorf("case %d block parent hash mismatch, want %s, get %s", id+1, c.headers[c.submitIndex].ParentHash.Hex(), res.Header().ParentHash.Hex())
}
case <-time.NewTimer(time.Second).C:
t.Errorf("case %d fetch ethash result timeout", id+1)
}
}
}