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-rw-r--r--consensus/ethash/algorithm.go8
-rw-r--r--consensus/ethash/api.go30
-rw-r--r--consensus/ethash/consensus.go44
-rw-r--r--consensus/ethash/ethash.go175
-rw-r--r--consensus/ethash/sealer.go357
5 files changed, 325 insertions, 289 deletions
diff --git a/consensus/ethash/algorithm.go b/consensus/ethash/algorithm.go
index 2b66c33..d6c8710 100644
--- a/consensus/ethash/algorithm.go
+++ b/consensus/ethash/algorithm.go
@@ -27,10 +27,10 @@ import (
"time"
"unsafe"
- "github.com/ava-labs/go-ethereum/common"
- "github.com/ava-labs/go-ethereum/common/bitutil"
- "github.com/ava-labs/go-ethereum/crypto"
- "github.com/ava-labs/go-ethereum/log"
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/common/bitutil"
+ "github.com/ethereum/go-ethereum/crypto"
+ "github.com/ethereum/go-ethereum/log"
"golang.org/x/crypto/sha3"
)
diff --git a/consensus/ethash/api.go b/consensus/ethash/api.go
index 34ed386..c983504 100644
--- a/consensus/ethash/api.go
+++ b/consensus/ethash/api.go
@@ -20,15 +20,15 @@ import (
"errors"
"github.com/ava-labs/coreth/core/types"
- "github.com/ava-labs/go-ethereum/common"
- "github.com/ava-labs/go-ethereum/common/hexutil"
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/common/hexutil"
)
var errEthashStopped = errors.New("ethash stopped")
// API exposes ethash related methods for the RPC interface.
type API struct {
- ethash *Ethash // Make sure the mode of ethash is normal.
+ ethash *Ethash
}
// GetWork returns a work package for external miner.
@@ -39,7 +39,7 @@ type API struct {
// result[2] - 32 bytes hex encoded boundary condition ("target"), 2^256/difficulty
// result[3] - hex encoded block number
func (api *API) GetWork() ([4]string, error) {
- if api.ethash.config.PowMode != ModeNormal && api.ethash.config.PowMode != ModeTest {
+ if api.ethash.remote == nil {
return [4]string{}, errors.New("not supported")
}
@@ -47,13 +47,11 @@ func (api *API) GetWork() ([4]string, error) {
workCh = make(chan [4]string, 1)
errc = make(chan error, 1)
)
-
select {
- case api.ethash.fetchWorkCh <- &sealWork{errc: errc, res: workCh}:
- case <-api.ethash.exitCh:
+ case api.ethash.remote.fetchWorkCh <- &sealWork{errc: errc, res: workCh}:
+ case <-api.ethash.remote.exitCh:
return [4]string{}, errEthashStopped
}
-
select {
case work := <-workCh:
return work, nil
@@ -66,23 +64,21 @@ func (api *API) GetWork() ([4]string, error) {
// It returns an indication if the work was accepted.
// Note either an invalid solution, a stale work a non-existent work will return false.
func (api *API) SubmitWork(nonce types.BlockNonce, hash, digest common.Hash) bool {
- if api.ethash.config.PowMode != ModeNormal && api.ethash.config.PowMode != ModeTest {
+ if api.ethash.remote == nil {
return false
}
var errc = make(chan error, 1)
-
select {
- case api.ethash.submitWorkCh <- &mineResult{
+ case api.ethash.remote.submitWorkCh <- &mineResult{
nonce: nonce,
mixDigest: digest,
hash: hash,
errc: errc,
}:
- case <-api.ethash.exitCh:
+ case <-api.ethash.remote.exitCh:
return false
}
-
err := <-errc
return err == nil
}
@@ -94,21 +90,19 @@ func (api *API) SubmitWork(nonce types.BlockNonce, hash, digest common.Hash) boo
// It accepts the miner hash rate and an identifier which must be unique
// between nodes.
func (api *API) SubmitHashRate(rate hexutil.Uint64, id common.Hash) bool {
- if api.ethash.config.PowMode != ModeNormal && api.ethash.config.PowMode != ModeTest {
+ if api.ethash.remote == nil {
return false
}
var done = make(chan struct{}, 1)
-
select {
- case api.ethash.submitRateCh <- &hashrate{done: done, rate: uint64(rate), id: id}:
- case <-api.ethash.exitCh:
+ case api.ethash.remote.submitRateCh <- &hashrate{done: done, rate: uint64(rate), id: id}:
+ case <-api.ethash.remote.exitCh:
return false
}
// Block until hash rate submitted successfully.
<-done
-
return true
}
diff --git a/consensus/ethash/consensus.go b/consensus/ethash/consensus.go
index dc88a79..dc56b6f 100644
--- a/consensus/ethash/consensus.go
+++ b/consensus/ethash/consensus.go
@@ -29,10 +29,11 @@ import (
"github.com/ava-labs/coreth/core/state"
"github.com/ava-labs/coreth/core/types"
"github.com/ava-labs/coreth/params"
- "github.com/ava-labs/go-ethereum/common"
- "github.com/ava-labs/go-ethereum/common/math"
- "github.com/ava-labs/go-ethereum/rlp"
mapset "github.com/deckarep/golang-set"
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/common/math"
+ "github.com/ethereum/go-ethereum/rlp"
+ "github.com/ethereum/go-ethereum/trie"
"golang.org/x/crypto/sha3"
)
@@ -44,6 +45,11 @@ var (
maxUncles = 2 // Maximum number of uncles allowed in a single block
allowedFutureBlockTime = 15 * time.Second // Max time from current time allowed for blocks, before they're considered future blocks
+ // calcDifficultyEip2384 is the difficulty adjustment algorithm as specified by EIP 2384.
+ // It offsets the bomb 4M blocks from Constantinople, so in total 9M blocks.
+ // Specification EIP-2384: https://eips.ethereum.org/EIPS/eip-2384
+ calcDifficultyEip2384 = makeDifficultyCalculator(big.NewInt(9000000))
+
// calcDifficultyConstantinople is the difficulty adjustment algorithm for Constantinople.
// It returns the difficulty that a new block should have when created at time given the
// parent block's time and difficulty. The calculation uses the Byzantium rules, but with
@@ -63,7 +69,7 @@ var (
// codebase, inherently breaking if the engine is swapped out. Please put common
// error types into the consensus package.
var (
- errZeroBlockTime = errors.New("timestamp equals parent's")
+ errOlderBlockTime = errors.New("timestamp older than parent")
errTooManyUncles = errors.New("too many uncles")
errDuplicateUncle = errors.New("duplicate uncle")
errUncleIsAncestor = errors.New("uncle is ancestor")
@@ -81,12 +87,12 @@ func (ethash *Ethash) Author(header *types.Header) (common.Address, error) {
// VerifyHeader checks whether a header conforms to the consensus rules of the
// stock Ethereum ethash engine.
-func (ethash *Ethash) VerifyHeader(chain consensus.ChainReader, header *types.Header, seal bool) error {
+func (ethash *Ethash) VerifyHeader(chain consensus.ChainHeaderReader, header *types.Header, seal bool) error {
// If we're running a full engine faking, accept any input as valid
if ethash.config.PowMode == ModeFullFake {
return nil
}
- // Short circuit if the header is known, or it's parent not
+ // Short circuit if the header is known, or its parent not
number := header.Number.Uint64()
if chain.GetHeader(header.Hash(), number) != nil {
return nil
@@ -102,7 +108,7 @@ func (ethash *Ethash) VerifyHeader(chain consensus.ChainReader, header *types.He
// VerifyHeaders is similar to VerifyHeader, but verifies a batch of headers
// concurrently. The method returns a quit channel to abort the operations and
// a results channel to retrieve the async verifications.
-func (ethash *Ethash) VerifyHeaders(chain consensus.ChainReader, headers []*types.Header, seals []bool) (chan<- struct{}, <-chan error) {
+func (ethash *Ethash) VerifyHeaders(chain consensus.ChainHeaderReader, headers []*types.Header, seals []bool) (chan<- struct{}, <-chan error) {
// If we're running a full engine faking, accept any input as valid
if ethash.config.PowMode == ModeFullFake || len(headers) == 0 {
abort, results := make(chan struct{}), make(chan error, len(headers))
@@ -164,7 +170,7 @@ func (ethash *Ethash) VerifyHeaders(chain consensus.ChainReader, headers []*type
return abort, errorsOut
}
-func (ethash *Ethash) verifyHeaderWorker(chain consensus.ChainReader, headers []*types.Header, seals []bool, index int) error {
+func (ethash *Ethash) verifyHeaderWorker(chain consensus.ChainHeaderReader, headers []*types.Header, seals []bool, index int) error {
var parent *types.Header
if index == 0 {
parent = chain.GetHeader(headers[0].ParentHash, headers[0].Number.Uint64()-1)
@@ -238,7 +244,7 @@ func (ethash *Ethash) VerifyUncles(chain consensus.ChainReader, block *types.Blo
// verifyHeader checks whether a header conforms to the consensus rules of the
// stock Ethereum ethash engine.
// See YP section 4.3.4. "Block Header Validity"
-func (ethash *Ethash) verifyHeader(chain consensus.ChainReader, header, parent *types.Header, uncle bool, seal bool) error {
+func (ethash *Ethash) verifyHeader(chain consensus.ChainHeaderReader, header, parent *types.Header, uncle bool, seal bool) error {
// Ensure that the header's extra-data section is of a reasonable size
if uint64(len(header.Extra)) > params.MaximumExtraDataSize {
return fmt.Errorf("extra-data too long: %d > %d", len(header.Extra), params.MaximumExtraDataSize)
@@ -250,9 +256,9 @@ func (ethash *Ethash) verifyHeader(chain consensus.ChainReader, header, parent *
}
}
if header.Time <= parent.Time {
- return errZeroBlockTime
+ return errOlderBlockTime
}
- // Verify the block's difficulty based in it's timestamp and parent's difficulty
+ // Verify the block's difficulty based on its timestamp and parent's difficulty
expected := ethash.CalcDifficulty(chain, header.Time, parent)
if expected.Cmp(header.Difficulty) != 0 {
@@ -301,7 +307,7 @@ func (ethash *Ethash) verifyHeader(chain consensus.ChainReader, header, parent *
// CalcDifficulty is the difficulty adjustment algorithm. It returns
// the difficulty that a new block should have when created at time
// given the parent block's time and difficulty.
-func (ethash *Ethash) CalcDifficulty(chain consensus.ChainReader, time uint64, parent *types.Header) *big.Int {
+func (ethash *Ethash) CalcDifficulty(chain consensus.ChainHeaderReader, time uint64, parent *types.Header) *big.Int {
return CalcDifficulty(chain.Config(), time, parent)
}
@@ -311,6 +317,8 @@ func (ethash *Ethash) CalcDifficulty(chain consensus.ChainReader, time uint64, p
func CalcDifficulty(config *params.ChainConfig, time uint64, parent *types.Header) *big.Int {
next := new(big.Int).Add(parent.Number, big1)
switch {
+ case config.IsMuirGlacier(next):
+ return calcDifficultyEip2384(time, parent)
case config.IsConstantinople(next):
return calcDifficultyConstantinople(time, parent)
case config.IsByzantium(next):
@@ -479,14 +487,14 @@ func calcDifficultyFrontier(time uint64, parent *types.Header) *big.Int {
// VerifySeal implements consensus.Engine, checking whether the given block satisfies
// the PoW difficulty requirements.
-func (ethash *Ethash) VerifySeal(chain consensus.ChainReader, header *types.Header) error {
+func (ethash *Ethash) VerifySeal(chain consensus.ChainHeaderReader, header *types.Header) error {
return ethash.verifySeal(chain, header, false)
}
// verifySeal checks whether a block satisfies the PoW difficulty requirements,
// either using the usual ethash cache for it, or alternatively using a full DAG
// to make remote mining fast.
-func (ethash *Ethash) verifySeal(chain consensus.ChainReader, header *types.Header, fulldag bool) error {
+func (ethash *Ethash) verifySeal(chain consensus.ChainHeaderReader, header *types.Header, fulldag bool) error {
// If we're running a fake PoW, accept any seal as valid
if ethash.config.PowMode == ModeFake || ethash.config.PowMode == ModeFullFake {
time.Sleep(ethash.fakeDelay)
@@ -551,7 +559,7 @@ func (ethash *Ethash) verifySeal(chain consensus.ChainReader, header *types.Head
// Prepare implements consensus.Engine, initializing the difficulty field of a
// header to conform to the ethash protocol. The changes are done inline.
-func (ethash *Ethash) Prepare(chain consensus.ChainReader, header *types.Header) error {
+func (ethash *Ethash) Prepare(chain consensus.ChainHeaderReader, header *types.Header) error {
parent := chain.GetHeader(header.ParentHash, header.Number.Uint64()-1)
if parent == nil {
return consensus.ErrUnknownAncestor
@@ -562,7 +570,7 @@ func (ethash *Ethash) Prepare(chain consensus.ChainReader, header *types.Header)
// Finalize implements consensus.Engine, accumulating the block and uncle rewards,
// setting the final state on the header
-func (ethash *Ethash) Finalize(chain consensus.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header) {
+func (ethash *Ethash) Finalize(chain consensus.ChainHeaderReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header) {
// Accumulate any block and uncle rewards and commit the final state root
accumulateRewards(chain.Config(), state, header, uncles)
header.Root = state.IntermediateRoot(chain.Config().IsEIP158(header.Number))
@@ -570,13 +578,13 @@ func (ethash *Ethash) Finalize(chain consensus.ChainReader, header *types.Header
// FinalizeAndAssemble implements consensus.Engine, accumulating the block and
// uncle rewards, setting the final state and assembling the block.
-func (ethash *Ethash) FinalizeAndAssemble(chain consensus.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error) {
+func (ethash *Ethash) FinalizeAndAssemble(chain consensus.ChainHeaderReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error) {
// Accumulate any block and uncle rewards and commit the final state root
accumulateRewards(chain.Config(), state, header, uncles)
header.Root = state.IntermediateRoot(chain.Config().IsEIP158(header.Number))
// Header seems complete, assemble into a block and return
- return types.NewBlock(header, txs, uncles, receipts, nil), nil
+ return types.NewBlock(header, txs, uncles, receipts, new(trie.Trie), nil), nil
}
// SealHash returns the hash of a block prior to it being sealed.
diff --git a/consensus/ethash/ethash.go b/consensus/ethash/ethash.go
index 53420d0..4a3912d 100644
--- a/consensus/ethash/ethash.go
+++ b/consensus/ethash/ethash.go
@@ -34,12 +34,10 @@ import (
"unsafe"
"github.com/ava-labs/coreth/consensus"
- "github.com/ava-labs/coreth/core/types"
"github.com/ava-labs/coreth/rpc"
- "github.com/ava-labs/go-ethereum/common"
- "github.com/ava-labs/go-ethereum/log"
- "github.com/ava-labs/go-ethereum/metrics"
mmap "github.com/edsrzf/mmap-go"
+ "github.com/ethereum/go-ethereum/log"
+ "github.com/ethereum/go-ethereum/metrics"
"github.com/hashicorp/golang-lru/simplelru"
)
@@ -50,7 +48,7 @@ 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, false)
+ sharedEthash = New(Config{"", 3, 0, false, "", 1, 0, false, ModeNormal, nil}, nil, false)
// algorithmRevision is the data structure version used for file naming.
algorithmRevision = 23
@@ -67,7 +65,7 @@ func isLittleEndian() bool {
}
// memoryMap tries to memory map a file of uint32s for read only access.
-func memoryMap(path string) (*os.File, mmap.MMap, []uint32, error) {
+func memoryMap(path string, lock bool) (*os.File, mmap.MMap, []uint32, error) {
file, err := os.OpenFile(path, os.O_RDONLY, 0644)
if err != nil {
return nil, nil, nil, err
@@ -84,6 +82,13 @@ func memoryMap(path string) (*os.File, mmap.MMap, []uint32, error) {
return nil, nil, nil, ErrInvalidDumpMagic
}
}
+ if lock {
+ if err := mem.Lock(); err != nil {
+ mem.Unmap()
+ file.Close()
+ return nil, nil, nil, err
+ }
+ }
return file, mem, buffer[len(dumpMagic):], err
}
@@ -109,7 +114,7 @@ func memoryMapFile(file *os.File, write bool) (mmap.MMap, []uint32, error) {
// memoryMapAndGenerate tries to memory map a temporary file of uint32s for write
// access, fill it with the data from a generator and then move it into the final
// path requested.
-func memoryMapAndGenerate(path string, size uint64, generator func(buffer []uint32)) (*os.File, mmap.MMap, []uint32, error) {
+func memoryMapAndGenerate(path string, size uint64, lock bool, generator func(buffer []uint32)) (*os.File, mmap.MMap, []uint32, error) {
// Ensure the data folder exists
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
return nil, nil, nil, err
@@ -144,7 +149,7 @@ func memoryMapAndGenerate(path string, size uint64, generator func(buffer []uint
if err := os.Rename(temp, path); err != nil {
return nil, nil, nil, err
}
- return memoryMap(path)
+ return memoryMap(path, lock)
}
// lru tracks caches or datasets by their last use time, keeping at most N of them.
@@ -215,7 +220,7 @@ func newCache(epoch uint64) interface{} {
}
// generate ensures that the cache content is generated before use.
-func (c *cache) generate(dir string, limit int, test bool) {
+func (c *cache) generate(dir string, limit int, lock bool, test bool) {
c.once.Do(func() {
size := cacheSize(c.epoch*epochLength + 1)
seed := seedHash(c.epoch*epochLength + 1)
@@ -242,7 +247,7 @@ func (c *cache) generate(dir string, limit int, test bool) {
// Try to load the file from disk and memory map it
var err error
- c.dump, c.mmap, c.cache, err = memoryMap(path)
+ c.dump, c.mmap, c.cache, err = memoryMap(path, lock)
if err == nil {
logger.Debug("Loaded old ethash cache from disk")
return
@@ -250,7 +255,7 @@ func (c *cache) generate(dir string, limit int, test bool) {
logger.Debug("Failed to load old ethash cache", "err", err)
// No previous cache available, create a new cache file to fill
- c.dump, c.mmap, c.cache, err = memoryMapAndGenerate(path, size, func(buffer []uint32) { generateCache(buffer, c.epoch, seed) })
+ c.dump, c.mmap, c.cache, err = memoryMapAndGenerate(path, size, lock, func(buffer []uint32) { generateCache(buffer, c.epoch, seed) })
if err != nil {
logger.Error("Failed to generate mapped ethash cache", "err", err)
@@ -292,7 +297,7 @@ func newDataset(epoch uint64) interface{} {
}
// generate ensures that the dataset content is generated before use.
-func (d *dataset) generate(dir string, limit int, test bool) {
+func (d *dataset) generate(dir string, limit int, lock bool, test bool) {
d.once.Do(func() {
// Mark the dataset generated after we're done. This is needed for remote
defer atomic.StoreUint32(&d.done, 1)
@@ -328,7 +333,7 @@ func (d *dataset) generate(dir string, limit int, test bool) {
// Try to load the file from disk and memory map it
var err error
- d.dump, d.mmap, d.dataset, err = memoryMap(path)
+ d.dump, d.mmap, d.dataset, err = memoryMap(path, lock)
if err == nil {
logger.Debug("Loaded old ethash dataset from disk")
return
@@ -339,7 +344,7 @@ func (d *dataset) generate(dir string, limit int, test bool) {
cache := make([]uint32, csize/4)
generateCache(cache, d.epoch, seed)
- d.dump, d.mmap, d.dataset, err = memoryMapAndGenerate(path, dsize, func(buffer []uint32) { generateDataset(buffer, d.epoch, cache) })
+ d.dump, d.mmap, d.dataset, err = memoryMapAndGenerate(path, dsize, lock, func(buffer []uint32) { generateDataset(buffer, d.epoch, cache) })
if err != nil {
logger.Error("Failed to generate mapped ethash dataset", "err", err)
@@ -374,13 +379,13 @@ func (d *dataset) finalizer() {
// MakeCache generates a new ethash cache and optionally stores it to disk.
func MakeCache(block uint64, dir string) {
c := cache{epoch: block / epochLength}
- c.generate(dir, math.MaxInt32, false)
+ c.generate(dir, math.MaxInt32, false, false)
}
// MakeDataset generates a new ethash dataset and optionally stores it to disk.
func MakeDataset(block uint64, dir string) {
d := dataset{epoch: block / epochLength}
- d.generate(dir, math.MaxInt32, false)
+ d.generate(dir, math.MaxInt32, false, false)
}
// Mode defines the type and amount of PoW verification an ethash engine makes.
@@ -396,43 +401,17 @@ const (
// Config are the configuration parameters of the ethash.
type Config struct {
- CacheDir string
- CachesInMem int
- CachesOnDisk int
- DatasetDir string
- DatasetsInMem int
- DatasetsOnDisk int
- PowMode Mode
-}
+ CacheDir string
+ CachesInMem int
+ CachesOnDisk int
+ CachesLockMmap bool
+ DatasetDir string
+ DatasetsInMem int
+ DatasetsOnDisk int
+ DatasetsLockMmap bool
+ 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
- mixDigest common.Hash
- hash common.Hash
-
- errc chan error
-}
-
-// hashrate wraps the hash rate submitted by the remote sealer.
-type hashrate struct {
- id common.Hash
- ping time.Time
- rate uint64
-
- done chan struct{}
-}
-
-// sealWork wraps a seal work package for remote sealer.
-type sealWork struct {
- errc chan error
- res chan [4]string
+ Log log.Logger `toml:"-"`
}
// Ethash is a consensus engine based on proof-of-work implementing the ethash
@@ -448,52 +427,42 @@ type Ethash struct {
threads int // Number of threads to mine on if mining
update chan struct{} // Notification channel to update mining parameters
hashrate metrics.Meter // Meter tracking the average hashrate
-
- // Remote sealer related fields
- 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
+ remote *remoteSealer
// The fields below are hooks for testing
shared *Ethash // Shared PoW verifier to avoid cache regeneration
fakeFail uint64 // Block number which fails PoW check even in fake mode
fakeDelay time.Duration // Time delay to sleep for before returning from verify
- lock sync.Mutex // Ensures thread safety for the in-memory caches and mining fields
- closeOnce sync.Once // Ensures exit channel will not be closed twice.
- exitCh chan chan error // Notification channel to exiting backend threads
+ lock sync.Mutex // Ensures thread safety for the in-memory caches and mining fields
+ closeOnce sync.Once // Ensures exit channel will not be closed twice.
}
// 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, noverify bool) *Ethash {
+ if config.Log == nil {
+ config.Log = log.Root()
+ }
if config.CachesInMem <= 0 {
- log.Warn("One ethash cache must always be in memory", "requested", config.CachesInMem)
+ config.Log.Warn("One ethash cache must always be in memory", "requested", config.CachesInMem)
config.CachesInMem = 1
}
if config.CacheDir != "" && config.CachesOnDisk > 0 {
- log.Info("Disk storage enabled for ethash caches", "dir", config.CacheDir, "count", config.CachesOnDisk)
+ config.Log.Info("Disk storage enabled for ethash caches", "dir", config.CacheDir, "count", config.CachesOnDisk)
}
if config.DatasetDir != "" && config.DatasetsOnDisk > 0 {
- log.Info("Disk storage enabled for ethash DAGs", "dir", config.DatasetDir, "count", config.DatasetsOnDisk)
+ config.Log.Info("Disk storage enabled for ethash DAGs", "dir", config.DatasetDir, "count", config.DatasetsOnDisk)
}
ethash := &Ethash{
- config: config,
- caches: newlru("cache", config.CachesInMem, newCache),
- datasets: newlru("dataset", config.DatasetsInMem, newDataset),
- update: make(chan struct{}),
- hashrate: metrics.NewMeterForced(),
- 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, noverify)
+ config: config,
+ caches: newlru("cache", config.CachesInMem, newCache),
+ datasets: newlru("dataset", config.DatasetsInMem, newDataset),
+ update: make(chan struct{}),
+ hashrate: metrics.NewMeterForced(),
+ }
+ ethash.remote = startRemoteSealer(ethash, notify, noverify)
return ethash
}
@@ -501,19 +470,13 @@ func New(config Config, notify []string, noverify bool) *Ethash {
// purposes.
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.NewMeterForced(),
- 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, noverify)
+ config: Config{PowMode: ModeTest, Log: log.Root()},
+ caches: newlru("cache", 1, newCache),
+ datasets: newlru("dataset", 1, newDataset),
+ update: make(chan struct{}),
+ hashrate: metrics.NewMeterForced(),
+ }
+ ethash.remote = startRemoteSealer(ethash, notify, noverify)
return ethash
}
@@ -524,6 +487,7 @@ func NewFaker() *Ethash {
return &Ethash{
config: Config{
PowMode: ModeFake,
+ Log: log.Root(),
},
}
}
@@ -535,6 +499,7 @@ func NewFakeFailer(fail uint64) *Ethash {
return &Ethash{
config: Config{
PowMode: ModeFake,
+ Log: log.Root(),
},
fakeFail: fail,
}
@@ -547,6 +512,7 @@ func NewFakeDelayer(delay time.Duration) *Ethash {
return &Ethash{
config: Config{
PowMode: ModeFake,
+ Log: log.Root(),
},
fakeDelay: delay,
}
@@ -558,6 +524,7 @@ func NewFullFaker() *Ethash {
return &Ethash{
config: Config{
PowMode: ModeFullFake,
+ Log: log.Root(),
},
}
}
@@ -573,13 +540,11 @@ func (ethash *Ethash) Close() error {
var err error
ethash.closeOnce.Do(func() {
// Short circuit if the exit channel is not allocated.
- if ethash.exitCh == nil {
+ if ethash.remote == nil {
return
}
- errc := make(chan error)
- ethash.exitCh <- errc
- err = <-errc
- close(ethash.exitCh)
+ close(ethash.remote.requestExit)
+ <-ethash.remote.exitCh
})
return err
}
@@ -593,12 +558,12 @@ func (ethash *Ethash) cache(block uint64) *cache {
current := currentI.(*cache)
// Wait for generation finish.
- current.generate(ethash.config.CacheDir, ethash.config.CachesOnDisk, ethash.config.PowMode == ModeTest)
+ current.generate(ethash.config.CacheDir, ethash.config.CachesOnDisk, ethash.config.CachesLockMmap, ethash.config.PowMode == ModeTest)
// If we need a new future cache, now's a good time to regenerate it.
if futureI != nil {
future := futureI.(*cache)
- go future.generate(ethash.config.CacheDir, ethash.config.CachesOnDisk, ethash.config.PowMode == ModeTest)
+ go future.generate(ethash.config.CacheDir, ethash.config.CachesOnDisk, ethash.config.CachesLockMmap, ethash.config.PowMode == ModeTest)
}
return current
}
@@ -618,20 +583,20 @@ func (ethash *Ethash) dataset(block uint64, async bool) *dataset {
// If async is specified, generate everything in a background thread
if async && !current.generated() {
go func() {
- current.generate(ethash.config.DatasetDir, ethash.config.DatasetsOnDisk, ethash.config.PowMode == ModeTest)
+ current.generate(ethash.config.DatasetDir, ethash.config.DatasetsOnDisk, ethash.config.DatasetsLockMmap, ethash.config.PowMode == ModeTest)
if futureI != nil {
future := futureI.(*dataset)
- future.generate(ethash.config.DatasetDir, ethash.config.DatasetsOnDisk, ethash.config.PowMode == ModeTest)
+ future.generate(ethash.config.DatasetDir, ethash.config.DatasetsOnDisk, ethash.config.DatasetsLockMmap, ethash.config.PowMode == ModeTest)
}
}()
} else {
// Either blocking generation was requested, or already done
- current.generate(ethash.config.DatasetDir, ethash.config.DatasetsOnDisk, ethash.config.PowMode == ModeTest)
+ current.generate(ethash.config.DatasetDir, ethash.config.DatasetsOnDisk, ethash.config.DatasetsLockMmap, ethash.config.PowMode == ModeTest)
if futureI != nil {
future := futureI.(*dataset)
- go future.generate(ethash.config.DatasetDir, ethash.config.DatasetsOnDisk, ethash.config.PowMode == ModeTest)
+ go future.generate(ethash.config.DatasetDir, ethash.config.DatasetsOnDisk, ethash.config.DatasetsLockMmap, ethash.config.PowMode == ModeTest)
}
}
return current
@@ -680,8 +645,8 @@ func (ethash *Ethash) Hashrate() float64 {
var res = make(chan uint64, 1)
select {
- case ethash.fetchRateCh <- res:
- case <-ethash.exitCh:
+ case ethash.remote.fetchRateCh <- res:
+ case <-ethash.remote.exitCh:
// Return local hashrate only if ethash is stopped.
return ethash.hashrate.Rate1()
}
@@ -691,7 +656,7 @@ func (ethash *Ethash) Hashrate() float64 {
}
// APIs implements consensus.Engine, returning the user facing RPC APIs.
-func (ethash *Ethash) APIs(chain consensus.ChainReader) []rpc.API {
+func (ethash *Ethash) APIs(chain consensus.ChainHeaderReader) []rpc.API {
// In order to ensure backward compatibility, we exposes ethash RPC APIs
// to both eth and ethash namespaces.
return []rpc.API{
diff --git a/consensus/ethash/sealer.go b/consensus/ethash/sealer.go
index 799be05..cb8eed7 100644
--- a/consensus/ethash/sealer.go
+++ b/consensus/ethash/sealer.go
@@ -18,6 +18,7 @@ package ethash
import (
"bytes"
+ "context"
crand "crypto/rand"
"encoding/json"
"errors"
@@ -31,9 +32,8 @@ import (
"github.com/ava-labs/coreth/consensus"
"github.com/ava-labs/coreth/core/types"
- "github.com/ava-labs/go-ethereum/common"
- "github.com/ava-labs/go-ethereum/common/hexutil"
- "github.com/ava-labs/go-ethereum/log"
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/common/hexutil"
)
const (
@@ -48,7 +48,7 @@ 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, results chan<- *types.Block, stop <-chan struct{}) error {
+func (ethash *Ethash) Seal(chain consensus.ChainHeaderReader, 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()
@@ -56,7 +56,7 @@ func (ethash *Ethash) Seal(chain consensus.ChainReader, block *types.Block, resu
select {
case results <- block.WithSeal(header):
default:
- log.Warn("Sealing result is not read by miner", "mode", "fake", "sealhash", ethash.SealHash(block.Header()))
+ ethash.config.Log.Warn("Sealing result is not read by miner", "mode", "fake", "sealhash", ethash.SealHash(block.Header()))
}
return nil
}
@@ -85,8 +85,8 @@ func (ethash *Ethash) Seal(chain consensus.ChainReader, block *types.Block, resu
threads = 0 // Allows disabling local mining without extra logic around local/remote
}
// Push new work to remote sealer
- if ethash.workCh != nil {
- ethash.workCh <- &sealTask{block: block, results: results}
+ if ethash.remote != nil {
+ ethash.remote.workCh <- &sealTask{block: block, results: results}
}
var (
pend sync.WaitGroup
@@ -111,14 +111,14 @@ func (ethash *Ethash) Seal(chain consensus.ChainReader, block *types.Block, resu
select {
case results <- result:
default:
- log.Warn("Sealing result is not read by miner", "mode", "local", "sealhash", ethash.SealHash(block.Header()))
+ ethash.config.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)
+ ethash.config.Log.Error("Failed to restart sealing after update", "err", err)
}
}
// Wait for all miners to terminate and return the block
@@ -143,7 +143,7 @@ func (ethash *Ethash) mine(block *types.Block, id int, seed uint64, abort chan s
attempts = int64(0)
nonce = seed
)
- logger := log.New("miner", id)
+ logger := ethash.config.Log.New("miner", id)
logger.Trace("Started ethash search for new nonces", "seed", seed)
search:
for {
@@ -186,160 +186,128 @@ search:
runtime.KeepAlive(dataset)
}
-// remote is a standalone goroutine to handle remote mining related stuff.
-func (ethash *Ethash) remote(notify []string, noverify bool) {
- var (
- works = make(map[common.Hash]*types.Block)
- rates = make(map[common.Hash]hashrate)
+// This is the timeout for HTTP requests to notify external miners.
+const remoteSealerTimeout = 1 * time.Second
- results chan<- *types.Block
- currentBlock *types.Block
- currentWork [4]string
+type remoteSealer struct {
+ works map[common.Hash]*types.Block
+ rates map[common.Hash]hashrate
+ currentBlock *types.Block
+ currentWork [4]string
+ notifyCtx context.Context
+ cancelNotify context.CancelFunc // cancels all notification requests
+ reqWG sync.WaitGroup // tracks notification request goroutines
- notifyTransport = &http.Transport{}
- notifyClient = &http.Client{
- Transport: notifyTransport,
- Timeout: time.Second,
- }
- notifyReqs = make([]*http.Request, len(notify))
- )
- // notifyWork notifies all the specified mining endpoints of the availability of
- // new work to be processed.
- notifyWork := func() {
- work := currentWork
- blob, _ := json.Marshal(work)
-
- for i, url := range notify {
- // Terminate any previously pending request and create the new work
- if notifyReqs[i] != nil {
- notifyTransport.CancelRequest(notifyReqs[i])
- }
- notifyReqs[i], _ = http.NewRequest("POST", url, bytes.NewReader(blob))
- notifyReqs[i].Header.Set("Content-Type", "application/json")
-
- // Push the new work concurrently to all the remote nodes
- go func(req *http.Request, url string) {
- res, err := notifyClient.Do(req)
- if err != nil {
- log.Warn("Failed to notify remote miner", "err", err)
- } else {
- log.Trace("Notified remote miner", "miner", url, "hash", log.Lazy{Fn: func() common.Hash { return common.HexToHash(work[0]) }}, "target", work[2])
- res.Body.Close()
- }
- }(notifyReqs[i], url)
- }
- }
- // makeWork creates a work package for external miner.
- //
- // The work package consists of 3 strings:
- // result[0], 32 bytes hex encoded current block header pow-hash
- // result[1], 32 bytes hex encoded seed hash used for DAG
- // result[2], 32 bytes hex encoded boundary condition ("target"), 2^256/difficulty
- // result[3], hex encoded block number
- makeWork := func(block *types.Block) {
- hash := ethash.SealHash(block.Header())
-
- currentWork[0] = hash.Hex()
- currentWork[1] = common.BytesToHash(SeedHash(block.NumberU64())).Hex()
- currentWork[2] = common.BytesToHash(new(big.Int).Div(two256, block.Difficulty()).Bytes()).Hex()
- currentWork[3] = hexutil.EncodeBig(block.Number())
-
- // Trace the seal work fetched by remote sealer.
- currentBlock = block
- works[hash] = block
- }
- // 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, 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[sealhash]
- if block == nil {
- log.Warn("Work submitted but none pending", "sealhash", sealhash, "curnumber", currentBlock.NumberU64())
- return false
- }
- // Verify the correctness of submitted result.
- header := block.Header()
- header.Nonce = nonce
- header.MixDigest = mixDigest
-
- start := time.Now()
- if !noverify {
- if err := ethash.verifySeal(nil, header, true); err != nil {
- log.Warn("Invalid proof-of-work submitted", "sealhash", sealhash, "elapsed", common.PrettyDuration(time.Since(start)), "err", err)
- return false
- }
- }
- // 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", "sealhash", sealhash, "elapsed", common.PrettyDuration(time.Since(start)))
+ ethash *Ethash
+ noverify bool
+ notifyURLs []string
+ results chan<- *types.Block
+ 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
+ requestExit chan struct{}
+ exitCh chan struct{}
+}
- // Solutions seems to be valid, return to the miner and notify acceptance.
- solution := block.WithSeal(header)
+// sealTask wraps a seal block with relative result channel for remote sealer thread.
+type sealTask struct {
+ block *types.Block
+ results chan<- *types.Block
+}
- // 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
+// mineResult wraps the pow solution parameters for the specified block.
+type mineResult struct {
+ nonce types.BlockNonce
+ mixDigest common.Hash
+ hash common.Hash
+
+ errc chan error
+}
+
+// hashrate wraps the hash rate submitted by the remote sealer.
+type hashrate struct {
+ id common.Hash
+ ping time.Time
+ rate uint64
+
+ done chan struct{}
+}
+
+// sealWork wraps a seal work package for remote sealer.
+type sealWork struct {
+ errc chan error
+ res chan [4]string
+}
+
+func startRemoteSealer(ethash *Ethash, urls []string, noverify bool) *remoteSealer {
+ ctx, cancel := context.WithCancel(context.Background())
+ s := &remoteSealer{
+ ethash: ethash,
+ noverify: noverify,
+ notifyURLs: urls,
+ notifyCtx: ctx,
+ cancelNotify: cancel,
+ works: make(map[common.Hash]*types.Block),
+ rates: make(map[common.Hash]hashrate),
+ workCh: make(chan *sealTask),
+ fetchWorkCh: make(chan *sealWork),
+ submitWorkCh: make(chan *mineResult),
+ fetchRateCh: make(chan chan uint64),
+ submitRateCh: make(chan *hashrate),
+ requestExit: make(chan struct{}),
+ exitCh: make(chan struct{}),
}
+ go s.loop()
+ return s
+}
+
+func (s *remoteSealer) loop() {
+ defer func() {
+ s.ethash.config.Log.Trace("Ethash remote sealer is exiting")
+ s.cancelNotify()
+ s.reqWG.Wait()
+ close(s.exitCh)
+ }()
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
for {
select {
- case work := <-ethash.workCh:
+ case work := <-s.workCh:
// Update current work with new received block.
// Note same work can be past twice, happens when changing CPU threads.
- results = work.results
+ s.results = work.results
+ s.makeWork(work.block)
+ s.notifyWork()
- makeWork(work.block)
-
- // Notify and requested URLs of the new work availability
- notifyWork()
-
- case work := <-ethash.fetchWorkCh:
+ case work := <-s.fetchWorkCh:
// Return current mining work to remote miner.
- if currentBlock == nil {
+ if s.currentBlock == nil {
work.errc <- errNoMiningWork
} else {
- work.res <- currentWork
+ work.res <- s.currentWork
}
- case result := <-ethash.submitWorkCh:
+ case result := <-s.submitWorkCh:
// Verify submitted PoW solution based on maintained mining blocks.
- if submitWork(result.nonce, result.mixDigest, result.hash) {
+ if s.submitWork(result.nonce, result.mixDigest, result.hash) {
result.errc <- nil
} else {
result.errc <- errInvalidSealResult
}
- case result := <-ethash.submitRateCh:
+ case result := <-s.submitRateCh:
// Trace remote sealer's hash rate by submitted value.
- rates[result.id] = hashrate{rate: result.rate, ping: time.Now()}
+ s.rates[result.id] = hashrate{rate: result.rate, ping: time.Now()}
close(result.done)
- case req := <-ethash.fetchRateCh:
+ case req := <-s.fetchRateCh:
// Gather all hash rate submitted by remote sealer.
var total uint64
- for _, rate := range rates {
+ for _, rate := range s.rates {
// this could overflow
total += rate.rate
}
@@ -347,25 +315,126 @@ func (ethash *Ethash) remote(notify []string, noverify bool) {
case <-ticker.C:
// Clear stale submitted hash rate.
- for id, rate := range rates {
+ for id, rate := range s.rates {
if time.Since(rate.ping) > 10*time.Second {
- delete(rates, id)
+ delete(s.rates, id)
}
}
// Clear stale pending blocks
- if currentBlock != nil {
- for hash, block := range works {
- if block.NumberU64()+staleThreshold <= currentBlock.NumberU64() {
- delete(works, hash)
+ if s.currentBlock != nil {
+ for hash, block := range s.works {
+ if block.NumberU64()+staleThreshold <= s.currentBlock.NumberU64() {
+ delete(s.works, hash)
}
}
}
- case errc := <-ethash.exitCh:
- // Exit remote loop if ethash is closed and return relevant error.
- errc <- nil
- log.Trace("Ethash remote sealer is exiting")
+ case <-s.requestExit:
return
}
}
}
+
+// makeWork creates a work package for external miner.
+//
+// The work package consists of 3 strings:
+// result[0], 32 bytes hex encoded current block header pow-hash
+// result[1], 32 bytes hex encoded seed hash used for DAG
+// result[2], 32 bytes hex encoded boundary condition ("target"), 2^256/difficulty
+// result[3], hex encoded block number
+func (s *remoteSealer) makeWork(block *types.Block) {
+ hash := s.ethash.SealHash(block.Header())
+ s.currentWork[0] = hash.Hex()
+ s.currentWork[1] = common.BytesToHash(SeedHash(block.NumberU64())).Hex()
+ s.currentWork[2] = common.BytesToHash(new(big.Int).Div(two256, block.Difficulty()).Bytes()).Hex()
+ s.currentWork[3] = hexutil.EncodeBig(block.Number())
+
+ // Trace the seal work fetched by remote sealer.
+ s.currentBlock = block
+ s.works[hash] = block
+}
+
+// notifyWork notifies all the specified mining endpoints of the availability of
+// new work to be processed.
+func (s *remoteSealer) notifyWork() {
+ work := s.currentWork
+ blob, _ := json.Marshal(work)
+ s.reqWG.Add(len(s.notifyURLs))
+ for _, url := range s.notifyURLs {
+ go s.sendNotification(s.notifyCtx, url, blob, work)
+ }
+}
+
+func (s *remoteSealer) sendNotification(ctx context.Context, url string, json []byte, work [4]string) {
+ defer s.reqWG.Done()
+
+ req, err := http.NewRequest("POST", url, bytes.NewReader(json))
+ if err != nil {
+ s.ethash.config.Log.Warn("Can't create remote miner notification", "err", err)
+ return
+ }
+ ctx, cancel := context.WithTimeout(ctx, remoteSealerTimeout)
+ defer cancel()
+ req = req.WithContext(ctx)
+ req.Header.Set("Content-Type", "application/json")
+
+ resp, err := http.DefaultClient.Do(req)
+ if err != nil {
+ s.ethash.config.Log.Warn("Failed to notify remote miner", "err", err)
+ } else {
+ s.ethash.config.Log.Trace("Notified remote miner", "miner", url, "hash", work[0], "target", work[2])
+ resp.Body.Close()
+ }
+}
+
+// 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).
+func (s *remoteSealer) submitWork(nonce types.BlockNonce, mixDigest common.Hash, sealhash common.Hash) bool {
+ if s.currentBlock == nil {
+ s.ethash.config.Log.Error("Pending work without block", "sealhash", sealhash)
+ return false
+ }
+ // Make sure the work submitted is present
+ block := s.works[sealhash]
+ if block == nil {
+ s.ethash.config.Log.Warn("Work submitted but none pending", "sealhash", sealhash, "curnumber", s.currentBlock.NumberU64())
+ return false
+ }
+ // Verify the correctness of submitted result.
+ header := block.Header()
+ header.Nonce = nonce
+ header.MixDigest = mixDigest
+
+ start := time.Now()
+ if !s.noverify {
+ if err := s.ethash.verifySeal(nil, header, true); err != nil {
+ s.ethash.config.Log.Warn("Invalid proof-of-work submitted", "sealhash", sealhash, "elapsed", common.PrettyDuration(time.Since(start)), "err", err)
+ return false
+ }
+ }
+ // Make sure the result channel is assigned.
+ if s.results == nil {
+ s.ethash.config.Log.Warn("Ethash result channel is empty, submitted mining result is rejected")
+ return false
+ }
+ s.ethash.config.Log.Trace("Verified correct proof-of-work", "sealhash", sealhash, "elapsed", common.PrettyDuration(time.Since(start)))
+
+ // Solutions seems to be valid, return to the miner and notify acceptance.
+ solution := block.WithSeal(header)
+
+ // The submitted solution is within the scope of acceptance.
+ if solution.NumberU64()+staleThreshold > s.currentBlock.NumberU64() {
+ select {
+ case s.results <- solution:
+ s.ethash.config.Log.Debug("Work submitted is acceptable", "number", solution.NumberU64(), "sealhash", sealhash, "hash", solution.Hash())
+ return true
+ default:
+ s.ethash.config.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.
+ s.ethash.config.Log.Warn("Work submitted is too old", "number", solution.NumberU64(), "sealhash", sealhash, "hash", solution.Hash())
+ return false
+}
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