diff options
Diffstat (limited to 'consensus/ethash')
| -rw-r--r-- | consensus/ethash/algorithm.go | 1148 | ||||
| -rw-r--r-- | consensus/ethash/api.go | 118 | ||||
| -rw-r--r-- | consensus/ethash/consensus.go | 637 | ||||
| -rw-r--r-- | consensus/ethash/ethash.go | 717 | ||||
| -rw-r--r-- | consensus/ethash/sealer.go | 371 |
5 files changed, 2991 insertions, 0 deletions
diff --git a/consensus/ethash/algorithm.go b/consensus/ethash/algorithm.go new file mode 100644 index 0000000..2b66c33 --- /dev/null +++ b/consensus/ethash/algorithm.go @@ -0,0 +1,1148 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package ethash + +import ( + "encoding/binary" + "hash" + "math/big" + "reflect" + "runtime" + "sync" + "sync/atomic" + "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" + "golang.org/x/crypto/sha3" +) + +const ( + datasetInitBytes = 1 << 30 // Bytes in dataset at genesis + datasetGrowthBytes = 1 << 23 // Dataset growth per epoch + cacheInitBytes = 1 << 24 // Bytes in cache at genesis + cacheGrowthBytes = 1 << 17 // Cache growth per epoch + epochLength = 30000 // Blocks per epoch + mixBytes = 128 // Width of mix + hashBytes = 64 // Hash length in bytes + hashWords = 16 // Number of 32 bit ints in a hash + datasetParents = 256 // Number of parents of each dataset element + cacheRounds = 3 // Number of rounds in cache production + loopAccesses = 64 // Number of accesses in hashimoto loop +) + +// cacheSize returns the size of the ethash verification cache that belongs to a certain +// block number. +func cacheSize(block uint64) uint64 { + epoch := int(block / epochLength) + if epoch < maxEpoch { + return cacheSizes[epoch] + } + return calcCacheSize(epoch) +} + +// calcCacheSize calculates the cache size for epoch. The cache size grows linearly, +// however, we always take the highest prime below the linearly growing threshold in order +// to reduce the risk of accidental regularities leading to cyclic behavior. +func calcCacheSize(epoch int) uint64 { + size := cacheInitBytes + cacheGrowthBytes*uint64(epoch) - hashBytes + for !new(big.Int).SetUint64(size / hashBytes).ProbablyPrime(1) { // Always accurate for n < 2^64 + size -= 2 * hashBytes + } + return size +} + +// datasetSize returns the size of the ethash mining dataset that belongs to a certain +// block number. +func datasetSize(block uint64) uint64 { + epoch := int(block / epochLength) + if epoch < maxEpoch { + return datasetSizes[epoch] + } + return calcDatasetSize(epoch) +} + +// calcDatasetSize calculates the dataset size for epoch. The dataset size grows linearly, +// however, we always take the highest prime below the linearly growing threshold in order +// to reduce the risk of accidental regularities leading to cyclic behavior. +func calcDatasetSize(epoch int) uint64 { + size := datasetInitBytes + datasetGrowthBytes*uint64(epoch) - mixBytes + for !new(big.Int).SetUint64(size / mixBytes).ProbablyPrime(1) { // Always accurate for n < 2^64 + size -= 2 * mixBytes + } + return size +} + +// hasher is a repetitive hasher allowing the same hash data structures to be +// reused between hash runs instead of requiring new ones to be created. +type hasher func(dest []byte, data []byte) + +// makeHasher creates a repetitive hasher, allowing the same hash data structures to +// be reused between hash runs instead of requiring new ones to be created. The returned +// function is not thread safe! +func makeHasher(h hash.Hash) hasher { + // sha3.state supports Read to get the sum, use it to avoid the overhead of Sum. + // Read alters the state but we reset the hash before every operation. + type readerHash interface { + hash.Hash + Read([]byte) (int, error) + } + rh, ok := h.(readerHash) + if !ok { + panic("can't find Read method on hash") + } + outputLen := rh.Size() + return func(dest []byte, data []byte) { + rh.Reset() + rh.Write(data) + rh.Read(dest[:outputLen]) + } +} + +// seedHash is the seed to use for generating a verification cache and the mining +// dataset. +func seedHash(block uint64) []byte { + seed := make([]byte, 32) + if block < epochLength { + return seed + } + keccak256 := makeHasher(sha3.NewLegacyKeccak256()) + for i := 0; i < int(block/epochLength); i++ { + keccak256(seed, seed) + } + return seed +} + +// generateCache creates a verification cache of a given size for an input seed. +// The cache production process involves first sequentially filling up 32 MB of +// memory, then performing two passes of Sergio Demian Lerner's RandMemoHash +// algorithm from Strict Memory Hard Hashing Functions (2014). The output is a +// set of 524288 64-byte values. +// This method places the result into dest in machine byte order. +func generateCache(dest []uint32, epoch uint64, seed []byte) { + // Print some debug logs to allow analysis on low end devices + logger := log.New("epoch", epoch) + + start := time.Now() + defer func() { + elapsed := time.Since(start) + + logFn := logger.Debug + if elapsed > 3*time.Second { + logFn = logger.Info + } + logFn("Generated ethash verification cache", "elapsed", common.PrettyDuration(elapsed)) + }() + // Convert our destination slice to a byte buffer + header := *(*reflect.SliceHeader)(unsafe.Pointer(&dest)) + header.Len *= 4 + header.Cap *= 4 + cache := *(*[]byte)(unsafe.Pointer(&header)) + + // Calculate the number of theoretical rows (we'll store in one buffer nonetheless) + size := uint64(len(cache)) + rows := int(size) / hashBytes + + // Start a monitoring goroutine to report progress on low end devices + var progress uint32 + + done := make(chan struct{}) + defer close(done) + + go func() { + for { + select { + case <-done: + return + case <-time.After(3 * time.Second): + logger.Info("Generating ethash verification cache", "percentage", atomic.LoadUint32(&progress)*100/uint32(rows)/4, "elapsed", common.PrettyDuration(time.Since(start))) + } + } + }() + // Create a hasher to reuse between invocations + keccak512 := makeHasher(sha3.NewLegacyKeccak512()) + + // Sequentially produce the initial dataset + keccak512(cache, seed) + for offset := uint64(hashBytes); offset < size; offset += hashBytes { + keccak512(cache[offset:], cache[offset-hashBytes:offset]) + atomic.AddUint32(&progress, 1) + } + // Use a low-round version of randmemohash + temp := make([]byte, hashBytes) + + for i := 0; i < cacheRounds; i++ { + for j := 0; j < rows; j++ { + var ( + srcOff = ((j - 1 + rows) % rows) * hashBytes + dstOff = j * hashBytes + xorOff = (binary.LittleEndian.Uint32(cache[dstOff:]) % uint32(rows)) * hashBytes + ) + bitutil.XORBytes(temp, cache[srcOff:srcOff+hashBytes], cache[xorOff:xorOff+hashBytes]) + keccak512(cache[dstOff:], temp) + + atomic.AddUint32(&progress, 1) + } + } + // Swap the byte order on big endian systems and return + if !isLittleEndian() { + swap(cache) + } +} + +// swap changes the byte order of the buffer assuming a uint32 representation. +func swap(buffer []byte) { + for i := 0; i < len(buffer); i += 4 { + binary.BigEndian.PutUint32(buffer[i:], binary.LittleEndian.Uint32(buffer[i:])) + } +} + +// fnv is an algorithm inspired by the FNV hash, which in some cases is used as +// a non-associative substitute for XOR. Note that we multiply the prime with +// the full 32-bit input, in contrast with the FNV-1 spec which multiplies the +// prime with one byte (octet) in turn. +func fnv(a, b uint32) uint32 { + return a*0x01000193 ^ b +} + +// fnvHash mixes in data into mix using the ethash fnv method. +func fnvHash(mix []uint32, data []uint32) { + for i := 0; i < len(mix); i++ { + mix[i] = mix[i]*0x01000193 ^ data[i] + } +} + +// generateDatasetItem combines data from 256 pseudorandomly selected cache nodes, +// and hashes that to compute a single dataset node. +func generateDatasetItem(cache []uint32, index uint32, keccak512 hasher) []byte { + // Calculate the number of theoretical rows (we use one buffer nonetheless) + rows := uint32(len(cache) / hashWords) + + // Initialize the mix + mix := make([]byte, hashBytes) + + binary.LittleEndian.PutUint32(mix, cache[(index%rows)*hashWords]^index) + for i := 1; i < hashWords; i++ { + binary.LittleEndian.PutUint32(mix[i*4:], cache[(index%rows)*hashWords+uint32(i)]) + } + keccak512(mix, mix) + + // Convert the mix to uint32s to avoid constant bit shifting + intMix := make([]uint32, hashWords) + for i := 0; i < len(intMix); i++ { + intMix[i] = binary.LittleEndian.Uint32(mix[i*4:]) + } + // fnv it with a lot of random cache nodes based on index + for i := uint32(0); i < datasetParents; i++ { + parent := fnv(index^i, intMix[i%16]) % rows + fnvHash(intMix, cache[parent*hashWords:]) + } + // Flatten the uint32 mix into a binary one and return + for i, val := range intMix { + binary.LittleEndian.PutUint32(mix[i*4:], val) + } + keccak512(mix, mix) + return mix +} + +// generateDataset generates the entire ethash dataset for mining. +// This method places the result into dest in machine byte order. +func generateDataset(dest []uint32, epoch uint64, cache []uint32) { + // Print some debug logs to allow analysis on low end devices + logger := log.New("epoch", epoch) + + start := time.Now() + defer func() { + elapsed := time.Since(start) + + logFn := logger.Debug + if elapsed > 3*time.Second { + logFn = logger.Info + } + logFn("Generated ethash verification cache", "elapsed", common.PrettyDuration(elapsed)) + }() + + // Figure out whether the bytes need to be swapped for the machine + swapped := !isLittleEndian() + + // Convert our destination slice to a byte buffer + header := *(*reflect.SliceHeader)(unsafe.Pointer(&dest)) + header.Len *= 4 + header.Cap *= 4 + dataset := *(*[]byte)(unsafe.Pointer(&header)) + + // Generate the dataset on many goroutines since it takes a while + threads := runtime.NumCPU() + size := uint64(len(dataset)) + + var pend sync.WaitGroup + pend.Add(threads) + + var progress uint32 + for i := 0; i < threads; i++ { + go func(id int) { + defer pend.Done() + + // Create a hasher to reuse between invocations + keccak512 := makeHasher(sha3.NewLegacyKeccak512()) + + // Calculate the data segment this thread should generate + batch := uint32((size + hashBytes*uint64(threads) - 1) / (hashBytes * uint64(threads))) + first := uint32(id) * batch + limit := first + batch + if limit > uint32(size/hashBytes) { + limit = uint32(size / hashBytes) + } + // Calculate the dataset segment + percent := uint32(size / hashBytes / 100) + for index := first; index < limit; index++ { + item := generateDatasetItem(cache, index, keccak512) + if swapped { + swap(item) + } + copy(dataset[index*hashBytes:], item) + + if status := atomic.AddUint32(&progress, 1); status%percent == 0 { + logger.Info("Generating DAG in progress", "percentage", uint64(status*100)/(size/hashBytes), "elapsed", common.PrettyDuration(time.Since(start))) + } + } + }(i) + } + // Wait for all the generators to finish and return + pend.Wait() +} + +// hashimoto aggregates data from the full dataset in order to produce our final +// value for a particular header hash and nonce. +func hashimoto(hash []byte, nonce uint64, size uint64, lookup func(index uint32) []uint32) ([]byte, []byte) { + // Calculate the number of theoretical rows (we use one buffer nonetheless) + rows := uint32(size / mixBytes) + + // Combine header+nonce into a 64 byte seed + seed := make([]byte, 40) + copy(seed, hash) + binary.LittleEndian.PutUint64(seed[32:], nonce) + + seed = crypto.Keccak512(seed) + seedHead := binary.LittleEndian.Uint32(seed) + + // Start the mix with replicated seed + mix := make([]uint32, mixBytes/4) + for i := 0; i < len(mix); i++ { + mix[i] = binary.LittleEndian.Uint32(seed[i%16*4:]) + } + // Mix in random dataset nodes + temp := make([]uint32, len(mix)) + + for i := 0; i < loopAccesses; i++ { + parent := fnv(uint32(i)^seedHead, mix[i%len(mix)]) % rows + for j := uint32(0); j < mixBytes/hashBytes; j++ { + copy(temp[j*hashWords:], lookup(2*parent+j)) + } + fnvHash(mix, temp) + } + // Compress mix + for i := 0; i < len(mix); i += 4 { + mix[i/4] = fnv(fnv(fnv(mix[i], mix[i+1]), mix[i+2]), mix[i+3]) + } + mix = mix[:len(mix)/4] + + digest := make([]byte, common.HashLength) + for i, val := range mix { + binary.LittleEndian.PutUint32(digest[i*4:], val) + } + return digest, crypto.Keccak256(append(seed, digest...)) +} + +// hashimotoLight aggregates data from the full dataset (using only a small +// in-memory cache) in order to produce our final value for a particular header +// hash and nonce. +func hashimotoLight(size uint64, cache []uint32, hash []byte, nonce uint64) ([]byte, []byte) { + keccak512 := makeHasher(sha3.NewLegacyKeccak512()) + + lookup := func(index uint32) []uint32 { + rawData := generateDatasetItem(cache, index, keccak512) + + data := make([]uint32, len(rawData)/4) + for i := 0; i < len(data); i++ { + data[i] = binary.LittleEndian.Uint32(rawData[i*4:]) + } + return data + } + return hashimoto(hash, nonce, size, lookup) +} + +// hashimotoFull aggregates data from the full dataset (using the full in-memory +// dataset) in order to produce our final value for a particular header hash and +// nonce. +func hashimotoFull(dataset []uint32, hash []byte, nonce uint64) ([]byte, []byte) { + lookup := func(index uint32) []uint32 { + offset := index * hashWords + return dataset[offset : offset+hashWords] + } + return hashimoto(hash, nonce, uint64(len(dataset))*4, lookup) +} + +const maxEpoch = 2048 + +// datasetSizes is a lookup table for the ethash dataset size for the first 2048 +// epochs (i.e. 61440000 blocks). +var datasetSizes = [maxEpoch]uint64{ + 1073739904, 1082130304, 1090514816, 1098906752, 1107293056, + 1115684224, 1124070016, 1132461952, 1140849536, 1149232768, + 1157627776, 1166013824, 1174404736, 1182786944, 1191180416, + 1199568512, 1207958912, 1216345216, 1224732032, 1233124736, + 1241513344, 1249902464, 1258290304, 1266673792, 1275067264, + 1283453312, 1291844992, 1300234112, 1308619904, 1317010048, + 1325397376, 1333787776, 1342176128, 1350561664, 1358954368, + 1367339392, 1375731584, 1384118144, 1392507008, 1400897408, + 1409284736, 1417673344, 1426062464, 1434451072, 1442839168, + 1451229056, 1459615616, 1468006016, 1476394112, 1484782976, + 1493171584, 1501559168, 1509948032, 1518337664, 1526726528, + 1535114624, 1543503488, 1551892096, 1560278656, 1568669056, + 1577056384, 1585446272, 1593831296, 1602219392, 1610610304, + 1619000192, 1627386752, 1635773824, 1644164224, 1652555648, + 1660943488, 1669332608, 1677721216, 1686109312, 1694497664, + 1702886272, 1711274624, 1719661184, 1728047744, 1736434816, + 1744829056, 1753218944, 1761606272, 1769995904, 1778382464, + 1786772864, 1795157888, 1803550592, 1811937664, 1820327552, + 1828711552, 1837102976, 1845488768, 1853879936, 1862269312, + 1870656896, 1879048064, 1887431552, 1895825024, 1904212096, + 1912601216, 1920988544, 1929379456, 1937765504, 1946156672, + 1954543232, 1962932096, 1971321728, 1979707264, 1988093056, + 1996487552, 2004874624, 2013262208, 2021653888, 2030039936, + 2038430848, 2046819968, 2055208576, 2063596672, 2071981952, + 2080373632, 2088762752, 2097149056, 2105539712, 2113928576, + 2122315136, 2130700672, 2139092608, 2147483264, 2155872128, + 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17649630848, 17658018944, 17666403968, 17674794112, + 17683178368, 17691573376, 17699962496, 17708350592, 17716739968, + 17725126528, 17733517184, 17741898112, 17750293888, 17758673024, + 17767070336, 17775458432, 17783848832, 17792236928, 17800625536, + 17809012352, 17817402752, 17825785984, 17834178944, 17842563968, + 17850955648, 17859344512, 17867732864, 17876119424, 17884511872, + 17892900224, 17901287296, 17909677696, 17918058112, 17926451072, + 17934843776, 17943230848, 17951609216, 17960008576, 17968397696, + 17976784256, 17985175424, 17993564032, 18001952128, 18010339712, + 18018728576, 18027116672, 18035503232, 18043894144, 18052283264, + 18060672128, 18069056384, 18077449856, 18085837184, 18094225792, + 18102613376, 18111004544, 18119388544, 18127781248, 18136170368, + 18144558976, 18152947328, 18161336192, 18169724288, 18178108544, + 18186498944, 18194886784, 18203275648, 18211666048, 18220048768, + 18228444544, 18236833408, 18245220736} + +// cacheSizes is a lookup table for the ethash verification cache size for the +// first 2048 epochs (i.e. 61440000 blocks). +var cacheSizes = [maxEpoch]uint64{ + 16776896, 16907456, 17039296, 17170112, 17301056, 17432512, 17563072, + 17693888, 17824192, 17955904, 18087488, 18218176, 18349504, 18481088, + 18611392, 18742336, 18874304, 19004224, 19135936, 19267264, 19398208, + 19529408, 19660096, 19791424, 19922752, 20053952, 20184896, 20315968, + 20446912, 20576576, 20709184, 20840384, 20971072, 21102272, 21233216, + 21364544, 21494848, 21626816, 21757376, 21887552, 22019392, 22151104, + 22281536, 22412224, 22543936, 22675264, 22806464, 22935872, 23068096, + 23198272, 23330752, 23459008, 23592512, 23723968, 23854912, 23986112, + 24116672, 24247616, 24378688, 24509504, 24640832, 24772544, 24903488, + 25034432, 25165376, 25296704, 25427392, 25558592, 25690048, 25820096, + 25951936, 26081728, 26214208, 26345024, 26476096, 26606656, 26737472, + 26869184, 26998208, 27131584, 27262528, 27393728, 27523904, 27655744, + 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+// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package ethash + +import ( + "errors" + + "github.com/ava-labs/coreth/core/types" + "github.com/ava-labs/go-ethereum/common" + "github.com/ava-labs/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. +} + +// GetWork returns 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 (api *API) GetWork() ([4]string, error) { + if api.ethash.config.PowMode != ModeNormal && api.ethash.config.PowMode != ModeTest { + return [4]string{}, errors.New("not supported") + } + + var ( + 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: + return [4]string{}, errEthashStopped + } + + select { + case work := <-workCh: + return work, nil + case err := <-errc: + return [4]string{}, err + } +} + +// SubmitWork can be used by external miner to submit their POW solution. +// 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 { + return false + } + + var errc = make(chan error, 1) + + select { + case api.ethash.submitWorkCh <- &mineResult{ + nonce: nonce, + mixDigest: digest, + hash: hash, + errc: errc, + }: + case <-api.ethash.exitCh: + return false + } + + err := <-errc + return err == nil +} + +// SubmitHashrate can be used for remote miners to submit their hash rate. +// This enables the node to report the combined hash rate of all miners +// which submit work through this node. +// +// 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 { + 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: + return false + } + + // Block until hash rate submitted successfully. + <-done + + return true +} + +// GetHashrate returns the current hashrate for local CPU miner and remote miner. +func (api *API) GetHashrate() uint64 { + return uint64(api.ethash.Hashrate()) +} diff --git a/consensus/ethash/consensus.go b/consensus/ethash/consensus.go new file mode 100644 index 0000000..d9130ec --- /dev/null +++ b/consensus/ethash/consensus.go @@ -0,0 +1,637 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package ethash + +import ( + "bytes" + "errors" + "fmt" + "math/big" + "runtime" + "time" + + "github.com/ava-labs/coreth/consensus" + "github.com/ava-labs/coreth/consensus/misc" + "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" + "golang.org/x/crypto/sha3" +) + +// Ethash proof-of-work protocol constants. +var ( + FrontierBlockReward = big.NewInt(5e+18) // Block reward in wei for successfully mining a block + ByzantiumBlockReward = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Byzantium + ConstantinopleBlockReward = big.NewInt(2e+18) // Block reward in wei for successfully mining a block upward from Constantinople + 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 + + // 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 + // bomb offset 5M. + // Specification EIP-1234: https://eips.ethereum.org/EIPS/eip-1234 + calcDifficultyConstantinople = makeDifficultyCalculator(big.NewInt(5000000)) + + // calcDifficultyByzantium 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. The calculation uses the Byzantium rules. + // Specification EIP-649: https://eips.ethereum.org/EIPS/eip-649 + calcDifficultyByzantium = makeDifficultyCalculator(big.NewInt(3000000)) +) + +// Various error messages to mark blocks invalid. These should be private to +// prevent engine specific errors from being referenced in the remainder of the +// 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") + errTooManyUncles = errors.New("too many uncles") + errDuplicateUncle = errors.New("duplicate uncle") + errUncleIsAncestor = errors.New("uncle is ancestor") + errDanglingUncle = errors.New("uncle's parent is not ancestor") + errInvalidDifficulty = errors.New("non-positive difficulty") + errInvalidMixDigest = errors.New("invalid mix digest") + errInvalidPoW = errors.New("invalid proof-of-work") +) + +// Author implements consensus.Engine, returning the header's coinbase as the +// proof-of-work verified author of the block. +func (ethash *Ethash) Author(header *types.Header) (common.Address, error) { + return header.Coinbase, nil +} + +// 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 { + // 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 + number := header.Number.Uint64() + if chain.GetHeader(header.Hash(), number) != nil { + return nil + } + parent := chain.GetHeader(header.ParentHash, number-1) + if parent == nil { + return consensus.ErrUnknownAncestor + } + // Sanity checks passed, do a proper verification + return ethash.verifyHeader(chain, header, parent, false, seal) +} + +// 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) { + // 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)) + for i := 0; i < len(headers); i++ { + results <- nil + } + return abort, results + } + + // Spawn as many workers as allowed threads + workers := runtime.GOMAXPROCS(0) + if len(headers) < workers { + workers = len(headers) + } + + // Create a task channel and spawn the verifiers + var ( + inputs = make(chan int) + done = make(chan int, workers) + errors = make([]error, len(headers)) + abort = make(chan struct{}) + ) + for i := 0; i < workers; i++ { + go func() { + for index := range inputs { + errors[index] = ethash.verifyHeaderWorker(chain, headers, seals, index) + done <- index + } + }() + } + + errorsOut := make(chan error, len(headers)) + go func() { + defer close(inputs) + var ( + in, out = 0, 0 + checked = make([]bool, len(headers)) + inputs = inputs + ) + for { + select { + case inputs <- in: + if in++; in == len(headers) { + // Reached end of headers. Stop sending to workers. + inputs = nil + } + case index := <-done: + for checked[index] = true; checked[out]; out++ { + errorsOut <- errors[out] + if out == len(headers)-1 { + return + } + } + case <-abort: + return + } + } + }() + return abort, errorsOut +} + +func (ethash *Ethash) verifyHeaderWorker(chain consensus.ChainReader, 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) + } else if headers[index-1].Hash() == headers[index].ParentHash { + parent = headers[index-1] + } + if parent == nil { + return consensus.ErrUnknownAncestor + } + if chain.GetHeader(headers[index].Hash(), headers[index].Number.Uint64()) != nil { + return nil // known block + } + return ethash.verifyHeader(chain, headers[index], parent, false, seals[index]) +} + +// VerifyUncles verifies that the given block's uncles conform to the consensus +// rules of the stock Ethereum ethash engine. +func (ethash *Ethash) VerifyUncles(chain consensus.ChainReader, block *types.Block) error { + // If we're running a full engine faking, accept any input as valid + if ethash.config.PowMode == ModeFullFake { + return nil + } + // Verify that there are at most 2 uncles included in this block + if len(block.Uncles()) > maxUncles { + return errTooManyUncles + } + if len(block.Uncles()) == 0 { + return nil + } + // Gather the set of past uncles and ancestors + uncles, ancestors := mapset.NewSet(), make(map[common.Hash]*types.Header) + + number, parent := block.NumberU64()-1, block.ParentHash() + for i := 0; i < 7; i++ { + ancestor := chain.GetBlock(parent, number) + if ancestor == nil { + break + } + ancestors[ancestor.Hash()] = ancestor.Header() + for _, uncle := range ancestor.Uncles() { + uncles.Add(uncle.Hash()) + } + parent, number = ancestor.ParentHash(), number-1 + } + ancestors[block.Hash()] = block.Header() + uncles.Add(block.Hash()) + + // Verify each of the uncles that it's recent, but not an ancestor + for _, uncle := range block.Uncles() { + // Make sure every uncle is rewarded only once + hash := uncle.Hash() + if uncles.Contains(hash) { + return errDuplicateUncle + } + uncles.Add(hash) + + // Make sure the uncle has a valid ancestry + if ancestors[hash] != nil { + return errUncleIsAncestor + } + if ancestors[uncle.ParentHash] == nil || uncle.ParentHash == block.ParentHash() { + return errDanglingUncle + } + if err := ethash.verifyHeader(chain, uncle, ancestors[uncle.ParentHash], true, true); err != nil { + return err + } + } + return nil +} + +// 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 { + // 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) + } + // Verify the header's timestamp + if !uncle { + if header.Time > uint64(time.Now().Add(allowedFutureBlockTime).Unix()) { + return consensus.ErrFutureBlock + } + } + if header.Time <= parent.Time { + return errZeroBlockTime + } + // Verify the block's difficulty based in it's timestamp and parent's difficulty + expected := ethash.CalcDifficulty(chain, header.Time, parent) + + if expected.Cmp(header.Difficulty) != 0 { + return fmt.Errorf("invalid difficulty: have %v, want %v", header.Difficulty, expected) + } + // Verify that the gas limit is <= 2^63-1 + cap := uint64(0x7fffffffffffffff) + if header.GasLimit > cap { + return fmt.Errorf("invalid gasLimit: have %v, max %v", header.GasLimit, cap) + } + // Verify that the gasUsed is <= gasLimit + if header.GasUsed > header.GasLimit { + return fmt.Errorf("invalid gasUsed: have %d, gasLimit %d", header.GasUsed, header.GasLimit) + } + + // Verify that the gas limit remains within allowed bounds + diff := int64(parent.GasLimit) - int64(header.GasLimit) + if diff < 0 { + diff *= -1 + } + limit := parent.GasLimit / params.GasLimitBoundDivisor + + if uint64(diff) >= limit || header.GasLimit < params.MinGasLimit { + return fmt.Errorf("invalid gas limit: have %d, want %d += %d", header.GasLimit, parent.GasLimit, limit) + } + // Verify that the block number is parent's +1 + if diff := new(big.Int).Sub(header.Number, parent.Number); diff.Cmp(big.NewInt(1)) != 0 { + return consensus.ErrInvalidNumber + } + // Verify the engine specific seal securing the block + if seal { + if err := ethash.VerifySeal(chain, header); err != nil { + return err + } + } + // If all checks passed, validate any special fields for hard forks + if err := misc.VerifyDAOHeaderExtraData(chain.Config(), header); err != nil { + return err + } + if err := misc.VerifyForkHashes(chain.Config(), header, uncle); err != nil { + return err + } + return nil +} + +// 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 { + return CalcDifficulty(chain.Config(), time, 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 CalcDifficulty(config *params.ChainConfig, time uint64, parent *types.Header) *big.Int { + next := new(big.Int).Add(parent.Number, big1) + switch { + case config.IsConstantinople(next): + return calcDifficultyConstantinople(time, parent) + case config.IsByzantium(next): + return calcDifficultyByzantium(time, parent) + case config.IsHomestead(next): + return calcDifficultyHomestead(time, parent) + default: + return calcDifficultyFrontier(time, parent) + } +} + +// Some weird constants to avoid constant memory allocs for them. +var ( + expDiffPeriod = big.NewInt(100000) + big1 = big.NewInt(1) + big2 = big.NewInt(2) + big9 = big.NewInt(9) + big10 = big.NewInt(10) + bigMinus99 = big.NewInt(-99) +) + +// makeDifficultyCalculator creates a difficultyCalculator with the given bomb-delay. +// the difficulty is calculated with Byzantium rules, which differs from Homestead in +// how uncles affect the calculation +func makeDifficultyCalculator(bombDelay *big.Int) func(time uint64, parent *types.Header) *big.Int { + // Note, the calculations below looks at the parent number, which is 1 below + // the block number. Thus we remove one from the delay given + bombDelayFromParent := new(big.Int).Sub(bombDelay, big1) + return func(time uint64, parent *types.Header) *big.Int { + // https://github.com/ethereum/EIPs/issues/100. + // algorithm: + // diff = (parent_diff + + // (parent_diff / 2048 * max((2 if len(parent.uncles) else 1) - ((timestamp - parent.timestamp) // 9), -99)) + // ) + 2^(periodCount - 2) + + bigTime := new(big.Int).SetUint64(time) + bigParentTime := new(big.Int).SetUint64(parent.Time) + + // holds intermediate values to make the algo easier to read & audit + x := new(big.Int) + y := new(big.Int) + + // (2 if len(parent_uncles) else 1) - (block_timestamp - parent_timestamp) // 9 + x.Sub(bigTime, bigParentTime) + x.Div(x, big9) + if parent.UncleHash == types.EmptyUncleHash { + x.Sub(big1, x) + } else { + x.Sub(big2, x) + } + // max((2 if len(parent_uncles) else 1) - (block_timestamp - parent_timestamp) // 9, -99) + if x.Cmp(bigMinus99) < 0 { + x.Set(bigMinus99) + } + // parent_diff + (parent_diff / 2048 * max((2 if len(parent.uncles) else 1) - ((timestamp - parent.timestamp) // 9), -99)) + y.Div(parent.Difficulty, params.DifficultyBoundDivisor) + x.Mul(y, x) + x.Add(parent.Difficulty, x) + + // minimum difficulty can ever be (before exponential factor) + if x.Cmp(params.MinimumDifficulty) < 0 { + x.Set(params.MinimumDifficulty) + } + // calculate a fake block number for the ice-age delay + // Specification: https://eips.ethereum.org/EIPS/eip-1234 + fakeBlockNumber := new(big.Int) + if parent.Number.Cmp(bombDelayFromParent) >= 0 { + fakeBlockNumber = fakeBlockNumber.Sub(parent.Number, bombDelayFromParent) + } + // for the exponential factor + periodCount := fakeBlockNumber + periodCount.Div(periodCount, expDiffPeriod) + + // the exponential factor, commonly referred to as "the bomb" + // diff = diff + 2^(periodCount - 2) + if periodCount.Cmp(big1) > 0 { + y.Sub(periodCount, big2) + y.Exp(big2, y, nil) + x.Add(x, y) + } + return x + } +} + +// calcDifficultyHomestead 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. The calculation uses the Homestead rules. +func calcDifficultyHomestead(time uint64, parent *types.Header) *big.Int { + // https://github.com/ethereum/EIPs/blob/master/EIPS/eip-2.md + // algorithm: + // diff = (parent_diff + + // (parent_diff / 2048 * max(1 - (block_timestamp - parent_timestamp) // 10, -99)) + // ) + 2^(periodCount - 2) + + bigTime := new(big.Int).SetUint64(time) + bigParentTime := new(big.Int).SetUint64(parent.Time) + + // holds intermediate values to make the algo easier to read & audit + x := new(big.Int) + y := new(big.Int) + + // 1 - (block_timestamp - parent_timestamp) // 10 + x.Sub(bigTime, bigParentTime) + x.Div(x, big10) + x.Sub(big1, x) + + // max(1 - (block_timestamp - parent_timestamp) // 10, -99) + if x.Cmp(bigMinus99) < 0 { + x.Set(bigMinus99) + } + // (parent_diff + parent_diff // 2048 * max(1 - (block_timestamp - parent_timestamp) // 10, -99)) + y.Div(parent.Difficulty, params.DifficultyBoundDivisor) + x.Mul(y, x) + x.Add(parent.Difficulty, x) + + // minimum difficulty can ever be (before exponential factor) + if x.Cmp(params.MinimumDifficulty) < 0 { + x.Set(params.MinimumDifficulty) + } + // for the exponential factor + periodCount := new(big.Int).Add(parent.Number, big1) + periodCount.Div(periodCount, expDiffPeriod) + + // the exponential factor, commonly referred to as "the bomb" + // diff = diff + 2^(periodCount - 2) + if periodCount.Cmp(big1) > 0 { + y.Sub(periodCount, big2) + y.Exp(big2, y, nil) + x.Add(x, y) + } + return x +} + +// calcDifficultyFrontier 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. The calculation uses the Frontier rules. +func calcDifficultyFrontier(time uint64, parent *types.Header) *big.Int { + diff := new(big.Int) + adjust := new(big.Int).Div(parent.Difficulty, params.DifficultyBoundDivisor) + bigTime := new(big.Int) + bigParentTime := new(big.Int) + + bigTime.SetUint64(time) + bigParentTime.SetUint64(parent.Time) + + if bigTime.Sub(bigTime, bigParentTime).Cmp(params.DurationLimit) < 0 { + diff.Add(parent.Difficulty, adjust) + } else { + diff.Sub(parent.Difficulty, adjust) + } + if diff.Cmp(params.MinimumDifficulty) < 0 { + diff.Set(params.MinimumDifficulty) + } + + periodCount := new(big.Int).Add(parent.Number, big1) + periodCount.Div(periodCount, expDiffPeriod) + if periodCount.Cmp(big1) > 0 { + // diff = diff + 2^(periodCount - 2) + expDiff := periodCount.Sub(periodCount, big2) + expDiff.Exp(big2, expDiff, nil) + diff.Add(diff, expDiff) + diff = math.BigMax(diff, params.MinimumDifficulty) + } + return diff +} + +// 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 { + 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 { + // 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) + if ethash.fakeFail == header.Number.Uint64() { + return errInvalidPoW + } + return nil + } + // If we're running a shared PoW, delegate verification to it + if ethash.shared != nil { + return ethash.shared.verifySeal(chain, header, fulldag) + } + // Ensure that we have a valid difficulty for the block + if header.Difficulty.Sign() <= 0 { + return errInvalidDifficulty + } + // Recompute the digest and PoW values + number := header.Number.Uint64() + + var ( + digest []byte + result []byte + ) + // If fast-but-heavy PoW verification was requested, use an ethash dataset + if fulldag { + dataset := ethash.dataset(number, true) + if dataset.generated() { + digest, result = hashimotoFull(dataset.dataset, ethash.SealHash(header).Bytes(), header.Nonce.Uint64()) + + // Datasets are unmapped in a finalizer. Ensure that the dataset stays alive + // until after the call to hashimotoFull so it's not unmapped while being used. + runtime.KeepAlive(dataset) + } else { + // Dataset not yet generated, don't hang, use a cache instead + fulldag = false + } + } + // If slow-but-light PoW verification was requested (or DAG not yet ready), use an ethash cache + if !fulldag { + cache := ethash.cache(number) + + size := datasetSize(number) + if ethash.config.PowMode == ModeTest { + size = 32 * 1024 + } + digest, result = hashimotoLight(size, cache.cache, ethash.SealHash(header).Bytes(), header.Nonce.Uint64()) + + // Caches are unmapped in a finalizer. Ensure that the cache stays alive + // until after the call to hashimotoLight so it's not unmapped while being used. + runtime.KeepAlive(cache) + } + // Verify the calculated values against the ones provided in the header + if !bytes.Equal(header.MixDigest[:], digest) { + return errInvalidMixDigest + } + target := new(big.Int).Div(two256, header.Difficulty) + if new(big.Int).SetBytes(result).Cmp(target) > 0 { + return errInvalidPoW + } + return nil +} + +// 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 { + parent := chain.GetHeader(header.ParentHash, header.Number.Uint64()-1) + if parent == nil { + return consensus.ErrUnknownAncestor + } + header.Difficulty = ethash.CalcDifficulty(chain, header.Time, parent) + return nil +} + +// 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) { + // 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)) +} + +// 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) { + // 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 +} + +// SealHash returns the hash of a block prior to it being sealed. +func (ethash *Ethash) SealHash(header *types.Header) (hash common.Hash) { + hasher := sha3.NewLegacyKeccak256() + + rlp.Encode(hasher, []interface{}{ + header.ParentHash, + header.UncleHash, + header.Coinbase, + header.Root, + header.TxHash, + header.ReceiptHash, + header.Bloom, + header.Difficulty, + header.Number, + header.GasLimit, + header.GasUsed, + header.Time, + header.Extra, + }) + hasher.Sum(hash[:0]) + return hash +} + +// Some weird constants to avoid constant memory allocs for them. +var ( + big8 = big.NewInt(8) + big32 = big.NewInt(32) +) + +// AccumulateRewards credits the coinbase of the given block with the mining +// reward. The total reward consists of the static block reward and rewards for +// included uncles. The coinbase of each uncle block is also rewarded. +func accumulateRewards(config *params.ChainConfig, state *state.StateDB, header *types.Header, uncles []*types.Header) { + // Select the correct block reward based on chain progression + blockReward := FrontierBlockReward + if config.IsByzantium(header.Number) { + blockReward = ByzantiumBlockReward + } + if config.IsConstantinople(header.Number) { + blockReward = ConstantinopleBlockReward + } + // Accumulate the rewards for the miner and any included uncles + reward := new(big.Int).Set(blockReward) + r := new(big.Int) + for _, uncle := range uncles { + r.Add(uncle.Number, big8) + r.Sub(r, header.Number) + r.Mul(r, blockReward) + r.Div(r, big8) + state.AddBalance(uncle.Coinbase, r) + + r.Div(blockReward, big32) + reward.Add(reward, r) + } + state.AddBalance(header.Coinbase, reward) +} diff --git a/consensus/ethash/ethash.go b/consensus/ethash/ethash.go new file mode 100644 index 0000000..53420d0 --- /dev/null +++ b/consensus/ethash/ethash.go @@ -0,0 +1,717 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +// Package ethash implements the ethash proof-of-work consensus engine. +package ethash + +import ( + "errors" + "fmt" + "math" + "math/big" + "math/rand" + "os" + "path/filepath" + "reflect" + "runtime" + "strconv" + "sync" + "sync/atomic" + "time" + "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/hashicorp/golang-lru/simplelru" +) + +var ErrInvalidDumpMagic = errors.New("invalid dump magic") + +var ( + // two256 is a big integer representing 2^256 + 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) + + // algorithmRevision is the data structure version used for file naming. + algorithmRevision = 23 + + // dumpMagic is a dataset dump header to sanity check a data dump. + dumpMagic = []uint32{0xbaddcafe, 0xfee1dead} +) + +// isLittleEndian returns whether the local system is running in little or big +// endian byte order. +func isLittleEndian() bool { + n := uint32(0x01020304) + return *(*byte)(unsafe.Pointer(&n)) == 0x04 +} + +// memoryMap tries to memory map a file of uint32s for read only access. +func memoryMap(path string) (*os.File, mmap.MMap, []uint32, error) { + file, err := os.OpenFile(path, os.O_RDONLY, 0644) + if err != nil { + return nil, nil, nil, err + } + mem, buffer, err := memoryMapFile(file, false) + if err != nil { + file.Close() + return nil, nil, nil, err + } + for i, magic := range dumpMagic { + if buffer[i] != magic { + mem.Unmap() + file.Close() + return nil, nil, nil, ErrInvalidDumpMagic + } + } + return file, mem, buffer[len(dumpMagic):], err +} + +// memoryMapFile tries to memory map an already opened file descriptor. +func memoryMapFile(file *os.File, write bool) (mmap.MMap, []uint32, error) { + // Try to memory map the file + flag := mmap.RDONLY + if write { + flag = mmap.RDWR + } + mem, err := mmap.Map(file, flag, 0) + if err != nil { + return nil, nil, err + } + // Yay, we managed to memory map the file, here be dragons + header := *(*reflect.SliceHeader)(unsafe.Pointer(&mem)) + header.Len /= 4 + header.Cap /= 4 + + return mem, *(*[]uint32)(unsafe.Pointer(&header)), nil +} + +// 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) { + // Ensure the data folder exists + if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil { + return nil, nil, nil, err + } + // Create a huge temporary empty file to fill with data + temp := path + "." + strconv.Itoa(rand.Int()) + + dump, err := os.Create(temp) + if err != nil { + return nil, nil, nil, err + } + if err = dump.Truncate(int64(len(dumpMagic))*4 + int64(size)); err != nil { + return nil, nil, nil, err + } + // Memory map the file for writing and fill it with the generator + mem, buffer, err := memoryMapFile(dump, true) + if err != nil { + dump.Close() + return nil, nil, nil, err + } + copy(buffer, dumpMagic) + + data := buffer[len(dumpMagic):] + generator(data) + + if err := mem.Unmap(); err != nil { + return nil, nil, nil, err + } + if err := dump.Close(); err != nil { + return nil, nil, nil, err + } + if err := os.Rename(temp, path); err != nil { + return nil, nil, nil, err + } + return memoryMap(path) +} + +// lru tracks caches or datasets by their last use time, keeping at most N of them. +type lru struct { + what string + new func(epoch uint64) interface{} + mu sync.Mutex + // Items are kept in a LRU cache, but there is a special case: + // We always keep an item for (highest seen epoch) + 1 as the 'future item'. + cache *simplelru.LRU + future uint64 + futureItem interface{} +} + +// newlru create a new least-recently-used cache for either the verification caches +// or the mining datasets. +func newlru(what string, maxItems int, new func(epoch uint64) interface{}) *lru { + if maxItems <= 0 { + maxItems = 1 + } + cache, _ := simplelru.NewLRU(maxItems, func(key, value interface{}) { + log.Trace("Evicted ethash "+what, "epoch", key) + }) + return &lru{what: what, new: new, cache: cache} +} + +// get retrieves or creates an item for the given epoch. The first return value is always +// non-nil. The second return value is non-nil if lru thinks that an item will be useful in +// the near future. +func (lru *lru) get(epoch uint64) (item, future interface{}) { + lru.mu.Lock() + defer lru.mu.Unlock() + + // Get or create the item for the requested epoch. + item, ok := lru.cache.Get(epoch) + if !ok { + if lru.future > 0 && lru.future == epoch { + item = lru.futureItem + } else { + log.Trace("Requiring new ethash "+lru.what, "epoch", epoch) + item = lru.new(epoch) + } + lru.cache.Add(epoch, item) + } + // Update the 'future item' if epoch is larger than previously seen. + if epoch < maxEpoch-1 && lru.future < epoch+1 { + log.Trace("Requiring new future ethash "+lru.what, "epoch", epoch+1) + future = lru.new(epoch + 1) + lru.future = epoch + 1 + lru.futureItem = future + } + return item, future +} + +// cache wraps an ethash cache with some metadata to allow easier concurrent use. +type cache struct { + epoch uint64 // Epoch for which this cache is relevant + dump *os.File // File descriptor of the memory mapped cache + mmap mmap.MMap // Memory map itself to unmap before releasing + cache []uint32 // The actual cache data content (may be memory mapped) + once sync.Once // Ensures the cache is generated only once +} + +// newCache creates a new ethash verification cache and returns it as a plain Go +// interface to be usable in an LRU cache. +func newCache(epoch uint64) interface{} { + return &cache{epoch: epoch} +} + +// generate ensures that the cache content is generated before use. +func (c *cache) generate(dir string, limit int, test bool) { + c.once.Do(func() { + size := cacheSize(c.epoch*epochLength + 1) + seed := seedHash(c.epoch*epochLength + 1) + if test { + size = 1024 + } + // If we don't store anything on disk, generate and return. + if dir == "" { + c.cache = make([]uint32, size/4) + generateCache(c.cache, c.epoch, seed) + return + } + // Disk storage is needed, this will get fancy + var endian string + if !isLittleEndian() { + endian = ".be" + } + path := filepath.Join(dir, fmt.Sprintf("cache-R%d-%x%s", algorithmRevision, seed[:8], endian)) + logger := log.New("epoch", c.epoch) + + // We're about to mmap the file, ensure that the mapping is cleaned up when the + // cache becomes unused. + runtime.SetFinalizer(c, (*cache).finalizer) + + // Try to load the file from disk and memory map it + var err error + c.dump, c.mmap, c.cache, err = memoryMap(path) + if err == nil { + logger.Debug("Loaded old ethash cache from disk") + return + } + 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) }) + if err != nil { + logger.Error("Failed to generate mapped ethash cache", "err", err) + + c.cache = make([]uint32, size/4) + generateCache(c.cache, c.epoch, seed) + } + // Iterate over all previous instances and delete old ones + for ep := int(c.epoch) - limit; ep >= 0; ep-- { + seed := seedHash(uint64(ep)*epochLength + 1) + path := filepath.Join(dir, fmt.Sprintf("cache-R%d-%x%s", algorithmRevision, seed[:8], endian)) + os.Remove(path) + } + }) +} + +// finalizer unmaps the memory and closes the file. +func (c *cache) finalizer() { + if c.mmap != nil { + c.mmap.Unmap() + c.dump.Close() + c.mmap, c.dump = nil, nil + } +} + +// dataset wraps an ethash dataset with some metadata to allow easier concurrent use. +type dataset struct { + epoch uint64 // Epoch for which this cache is relevant + dump *os.File // File descriptor of the memory mapped cache + mmap mmap.MMap // Memory map itself to unmap before releasing + dataset []uint32 // The actual cache data content + once sync.Once // Ensures the cache is generated only once + done uint32 // Atomic flag to determine generation status +} + +// newDataset creates a new ethash mining dataset and returns it as a plain Go +// interface to be usable in an LRU cache. +func newDataset(epoch uint64) interface{} { + return &dataset{epoch: epoch} +} + +// generate ensures that the dataset content is generated before use. +func (d *dataset) generate(dir string, limit int, 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) + + csize := cacheSize(d.epoch*epochLength + 1) + dsize := datasetSize(d.epoch*epochLength + 1) + seed := seedHash(d.epoch*epochLength + 1) + if test { + csize = 1024 + dsize = 32 * 1024 + } + // If we don't store anything on disk, generate and return + if dir == "" { + cache := make([]uint32, csize/4) + generateCache(cache, d.epoch, seed) + + d.dataset = make([]uint32, dsize/4) + generateDataset(d.dataset, d.epoch, cache) + + return + } + // Disk storage is needed, this will get fancy + var endian string + if !isLittleEndian() { + endian = ".be" + } + path := filepath.Join(dir, fmt.Sprintf("full-R%d-%x%s", algorithmRevision, seed[:8], endian)) + logger := log.New("epoch", d.epoch) + + // We're about to mmap the file, ensure that the mapping is cleaned up when the + // cache becomes unused. + runtime.SetFinalizer(d, (*dataset).finalizer) + + // Try to load the file from disk and memory map it + var err error + d.dump, d.mmap, d.dataset, err = memoryMap(path) + if err == nil { + logger.Debug("Loaded old ethash dataset from disk") + return + } + logger.Debug("Failed to load old ethash dataset", "err", err) + + // No previous dataset available, create a new dataset file to fill + 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) }) + if err != nil { + logger.Error("Failed to generate mapped ethash dataset", "err", err) + + d.dataset = make([]uint32, dsize/2) + generateDataset(d.dataset, d.epoch, cache) + } + // Iterate over all previous instances and delete old ones + for ep := int(d.epoch) - limit; ep >= 0; ep-- { + seed := seedHash(uint64(ep)*epochLength + 1) + path := filepath.Join(dir, fmt.Sprintf("full-R%d-%x%s", algorithmRevision, seed[:8], endian)) + os.Remove(path) + } + }) +} + +// generated returns whether this particular dataset finished generating already +// or not (it may not have been started at all). This is useful for remote miners +// to default to verification caches instead of blocking on DAG generations. +func (d *dataset) generated() bool { + return atomic.LoadUint32(&d.done) == 1 +} + +// finalizer closes any file handlers and memory maps open. +func (d *dataset) finalizer() { + if d.mmap != nil { + d.mmap.Unmap() + d.dump.Close() + d.mmap, d.dump = nil, nil + } +} + +// 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) +} + +// 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) +} + +// Mode defines the type and amount of PoW verification an ethash engine makes. +type Mode uint + +const ( + ModeNormal Mode = iota + ModeShared + ModeTest + ModeFake + ModeFullFake +) + +// 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 +} + +// 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 +} + +// Ethash is a consensus engine based on proof-of-work implementing the ethash +// algorithm. +type Ethash struct { + config Config + + caches *lru // In memory caches to avoid regenerating too often + datasets *lru // In memory datasets to avoid regenerating too often + + // Mining related fields + rand *rand.Rand // Properly seeded random source for nonces + 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 + + // 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 +} + +// 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.CachesInMem <= 0 { + 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) + } + if config.DatasetDir != "" && config.DatasetsOnDisk > 0 { + 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) + return ethash +} + +// NewTester creates a small sized ethash PoW scheme useful only for testing +// 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) + return ethash +} + +// NewFaker creates a ethash consensus engine with a fake PoW scheme that accepts +// all blocks' seal as valid, though they still have to conform to the Ethereum +// consensus rules. +func NewFaker() *Ethash { + return &Ethash{ + config: Config{ + PowMode: ModeFake, + }, + } +} + +// NewFakeFailer creates a ethash consensus engine with a fake PoW scheme that +// accepts all blocks as valid apart from the single one specified, though they +// still have to conform to the Ethereum consensus rules. +func NewFakeFailer(fail uint64) *Ethash { + return &Ethash{ + config: Config{ + PowMode: ModeFake, + }, + fakeFail: fail, + } +} + +// NewFakeDelayer creates a ethash consensus engine with a fake PoW scheme that +// accepts all blocks as valid, but delays verifications by some time, though +// they still have to conform to the Ethereum consensus rules. +func NewFakeDelayer(delay time.Duration) *Ethash { + return &Ethash{ + config: Config{ + PowMode: ModeFake, + }, + fakeDelay: delay, + } +} + +// NewFullFaker creates an ethash consensus engine with a full fake scheme that +// accepts all blocks as valid, without checking any consensus rules whatsoever. +func NewFullFaker() *Ethash { + return &Ethash{ + config: Config{ + PowMode: ModeFullFake, + }, + } +} + +// NewShared creates a full sized ethash PoW shared between all requesters running +// in the same process. +func NewShared() *Ethash { + return &Ethash{shared: sharedEthash} +} + +// Close closes the exit channel to notify all backend threads exiting. +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 { + return + } + errc := make(chan error) + ethash.exitCh <- errc + err = <-errc + close(ethash.exitCh) + }) + return err +} + +// cache tries to retrieve a verification cache for the specified block number +// by first checking against a list of in-memory caches, then against caches +// stored on disk, and finally generating one if none can be found. +func (ethash *Ethash) cache(block uint64) *cache { + epoch := block / epochLength + currentI, futureI := ethash.caches.get(epoch) + current := currentI.(*cache) + + // Wait for generation finish. + current.generate(ethash.config.CacheDir, ethash.config.CachesOnDisk, 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) + } + return current +} + +// dataset tries to retrieve a mining dataset for the specified block number +// by first checking against a list of in-memory datasets, then against DAGs +// stored on disk, and finally generating one if none can be found. +// +// If async is specified, not only the future but the current DAG is also +// generates on a background thread. +func (ethash *Ethash) dataset(block uint64, async bool) *dataset { + // Retrieve the requested ethash dataset + epoch := block / epochLength + currentI, futureI := ethash.datasets.get(epoch) + current := currentI.(*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) + + if futureI != nil { + future := futureI.(*dataset) + future.generate(ethash.config.DatasetDir, ethash.config.DatasetsOnDisk, 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) + + if futureI != nil { + future := futureI.(*dataset) + go future.generate(ethash.config.DatasetDir, ethash.config.DatasetsOnDisk, ethash.config.PowMode == ModeTest) + } + } + return current +} + +// Threads returns the number of mining threads currently enabled. This doesn't +// necessarily mean that mining is running! +func (ethash *Ethash) Threads() int { + ethash.lock.Lock() + defer ethash.lock.Unlock() + + return ethash.threads +} + +// SetThreads updates the number of mining threads currently enabled. Calling +// this method does not start mining, only sets the thread count. If zero is +// specified, the miner will use all cores of the machine. Setting a thread +// count below zero is allowed and will cause the miner to idle, without any +// work being done. +func (ethash *Ethash) SetThreads(threads int) { + ethash.lock.Lock() + defer ethash.lock.Unlock() + + // If we're running a shared PoW, set the thread count on that instead + if ethash.shared != nil { + ethash.shared.SetThreads(threads) + return + } + // Update the threads and ping any running seal to pull in any changes + ethash.threads = threads + select { + case ethash.update <- struct{}{}: + default: + } +} + +// Hashrate implements PoW, returning the measured rate of the search invocations +// per second over the last minute. +// Note the returned hashrate includes local hashrate, but also includes the total +// hashrate of all remote miner. +func (ethash *Ethash) Hashrate() float64 { + // Short circuit if we are run the ethash in normal/test mode. + if ethash.config.PowMode != ModeNormal && ethash.config.PowMode != ModeTest { + return ethash.hashrate.Rate1() + } + var res = make(chan uint64, 1) + + select { + case ethash.fetchRateCh <- res: + case <-ethash.exitCh: + // Return local hashrate only if ethash is stopped. + return ethash.hashrate.Rate1() + } + + // Gather total submitted hash rate of remote sealers. + return ethash.hashrate.Rate1() + float64(<-res) +} + +// APIs implements consensus.Engine, returning the user facing RPC APIs. +func (ethash *Ethash) APIs(chain consensus.ChainReader) []rpc.API { + // In order to ensure backward compatibility, we exposes ethash RPC APIs + // to both eth and ethash namespaces. + return []rpc.API{ + { + Namespace: "eth", + Version: "1.0", + Service: &API{ethash}, + Public: true, + }, + { + Namespace: "ethash", + Version: "1.0", + Service: &API{ethash}, + Public: true, + }, + } +} + +// SeedHash is the seed to use for generating a verification cache and the mining +// dataset. +func SeedHash(block uint64) []byte { + return seedHash(block) +} diff --git a/consensus/ethash/sealer.go b/consensus/ethash/sealer.go new file mode 100644 index 0000000..799be05 --- /dev/null +++ b/consensus/ethash/sealer.go @@ -0,0 +1,371 @@ +// Copyright 2017 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum library is free software: you can redistribute it and/or modify +// it under the terms of the GNU Lesser General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// The go-ethereum library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package ethash + +import ( + "bytes" + crand "crypto/rand" + "encoding/json" + "errors" + "math" + "math/big" + "math/rand" + "net/http" + "runtime" + "sync" + "time" + + "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" +) + +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") +) + +// 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 { + // 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{} + 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, results, stop) + } + // Create a runner and the multiple search threads it directs + abort := make(chan struct{}) + + ethash.lock.Lock() + threads := ethash.threads + if ethash.rand == nil { + seed, err := crand.Int(crand.Reader, big.NewInt(math.MaxInt64)) + if err != nil { + ethash.lock.Unlock() + return err + } + ethash.rand = rand.New(rand.NewSource(seed.Int64())) + } + ethash.lock.Unlock() + if threads == 0 { + threads = runtime.NumCPU() + } + if threads < 0 { + 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} + } + 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, locals) + }(i, uint64(ethash.rand.Int63())) + } + // Wait until sealing is terminated or a nonce is found + 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 nil +} + +// mine is the actual proof-of-work miner that searches for a nonce starting from +// seed that results in correct final block difficulty. +func (ethash *Ethash) mine(block *types.Block, id int, seed uint64, abort chan struct{}, found chan *types.Block) { + // Extract some data from the header + var ( + header = block.Header() + hash = ethash.SealHash(header).Bytes() + target = new(big.Int).Div(two256, header.Difficulty) + number = header.Number.Uint64() + dataset = ethash.dataset(number, false) + ) + // Start generating random nonces until we abort or find a good one + var ( + attempts = int64(0) + nonce = seed + ) + logger := log.New("miner", id) + logger.Trace("Started ethash search for new nonces", "seed", seed) +search: + for { + select { + case <-abort: + // Mining terminated, update stats and abort + logger.Trace("Ethash nonce search aborted", "attempts", nonce-seed) + ethash.hashrate.Mark(attempts) + break search + + default: + // We don't have to update hash rate on every nonce, so update after after 2^X nonces + attempts++ + if (attempts % (1 << 15)) == 0 { + ethash.hashrate.Mark(attempts) + attempts = 0 + } + // Compute the PoW value of this nonce + digest, result := hashimotoFull(dataset.dataset, hash, nonce) + if new(big.Int).SetBytes(result).Cmp(target) <= 0 { + // Correct nonce found, create a new header with it + header = types.CopyHeader(header) + header.Nonce = types.EncodeNonce(nonce) + header.MixDigest = common.BytesToHash(digest) + + // Seal and return a block (if still needed) + select { + case found <- block.WithSeal(header): + logger.Trace("Ethash nonce found and reported", "attempts", nonce-seed, "nonce", nonce) + case <-abort: + logger.Trace("Ethash nonce found but discarded", "attempts", nonce-seed, "nonce", nonce) + } + break search + } + nonce++ + } + } + // Datasets are unmapped in a finalizer. Ensure that the dataset stays live + // during sealing so it's not unmapped while being read. + 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) + + results chan<- *types.Block + currentBlock *types.Block + currentWork [4]string + + 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))) + + // 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 > 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) + defer ticker.Stop() + + for { + select { + case work := <-ethash.workCh: + // Update current work with new received block. + // Note same work can be past twice, happens when changing CPU threads. + results = work.results + + makeWork(work.block) + + // Notify and requested URLs of the new work availability + notifyWork() + + case work := <-ethash.fetchWorkCh: + // Return current mining work to remote miner. + if currentBlock == nil { + work.errc <- errNoMiningWork + } else { + work.res <- currentWork + } + + case result := <-ethash.submitWorkCh: + // Verify submitted PoW solution based on maintained mining blocks. + if submitWork(result.nonce, result.mixDigest, result.hash) { + result.errc <- nil + } else { + result.errc <- errInvalidSealResult + } + + case result := <-ethash.submitRateCh: + // Trace remote sealer's hash rate by submitted value. + rates[result.id] = hashrate{rate: result.rate, ping: time.Now()} + close(result.done) + + case req := <-ethash.fetchRateCh: + // Gather all hash rate submitted by remote sealer. + var total uint64 + for _, rate := range rates { + // this could overflow + total += rate.rate + } + req <- total + + case <-ticker.C: + // Clear stale submitted hash rate. + for id, rate := range rates { + if time.Since(rate.ping) > 10*time.Second { + 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. + errc <- nil + log.Trace("Ethash remote sealer is exiting") + return + } + } +} |