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