ethash

package
v0.0.6 Latest Latest
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 Go to latest Published: Nov 1, 2024 License: GPL-3.0 Imports: 48 Imported by: 0

Documentation

Overview

Copyright 2019 The multi-geth Authors This file is part of the multi-geth library.

The multi-geth 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 multi-geth 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 multi-geth library. If not, see <http://www.gnu.org/licenses/>.

Package ethash implements the ethash proof-of-work consensus engine.

Index

Constants

This section is empty.

Variables

View Source 
var DynamicDifficultyCalculator = MakeDifficultyCalculatorU256
View Source 
var ErrInvalidDumpMagic = errors.New("invalid dump magic")
View Source 
var FrontierDifficultyCalculator = CalcDifficultyFrontierU256

Exported for fuzzing

View Source 
var HomesteadDifficultyCalculator = CalcDifficultyHomesteadU256

Functions

func CalcDifficulty 

func CalcDifficulty(config ctypes.ChainConfigurator, time uint64, parent *types.Header) *big.Int

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 CalcDifficultyFrontierU256 

func CalcDifficultyFrontierU256(time uint64, parent *types.Header) *big.Int

CalcDifficultyFrontierU256 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 CalcDifficultyHomesteadU256 

func CalcDifficultyHomesteadU256(time uint64, parent *types.Header) *big.Int

CalcDifficultyHomesteadU256 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 CalcEpoch 

func CalcEpoch(block uint64, epochLength uint64) uint64

CalcEpoch returns the epoch for a given block number (ECIP-1099)

func CalcEpochLength 

func CalcEpochLength(block uint64, ecip1099FBlock *uint64) uint64

CalcEpochLength returns the epoch length for a given block number (ECIP-1099)

func HashimotoFull added in v0.0.6 

func HashimotoFull(dataset []uint32, hash []byte, nonce uint64) ([]byte, []byte)

func HashimotoLight added in v0.0.2 

func HashimotoLight(size uint64, cache []uint32, hash []byte, nonce uint64) ([]byte, []byte)

func MakeCache 

func MakeCache(block uint64, epochLength uint64, dir string)

MakeCache generates a new ethash cache and optionally stores it to disk.

func MakeDataset 

func MakeDataset(block uint64, epochLength uint64, dir string)

MakeDataset generates a new ethash dataset and optionally stores it to disk.

func MakeDifficultyCalculatorU256 

func MakeDifficultyCalculatorU256(bombDelay *big.Int) func(time uint64, parent *types.Header) *big.Int

MakeDifficultyCalculatorU256 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 SeedHash 

func SeedHash(epoch uint64, epochLength uint64) []byte

SeedHash is the seed to use for generating a verification cache and the mining dataset.

Types

type API 

type API struct {
	// contains filtered or unexported fields
}

API exposes ethash related methods for the RPC interface.

func (*API) GetHashrate 

func (api *API) GetHashrate() uint64

GetHashrate returns the current hashrate for local CPU miner and remote miner.

func (*API) GetWork 

func (api *API) GetWork() ([4]string, error)

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) SubmitHashrate 

func (api *API) SubmitHashrate(rate hexutil.Uint64, id common.Hash) bool

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) SubmitWork 

func (api *API) SubmitWork(nonce types.BlockNonce, hash, digest common.Hash) bool

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.

type Cache added in v0.0.4 

type Cache struct {
	// contains filtered or unexported fields
}

func NewCache added in v0.0.3 

func NewCache(epoch uint64, epochLength uint64) *Cache

func (*Cache) Generate added in v0.0.4 

func (c *Cache) Generate(dir string, limit int, lock bool, test bool)

func (*Cache) GetCache added in v0.0.5 

func (c *Cache) GetCache() []uint32

type Config 

type Config struct {
	CacheDir         string
	CachesInMem      int
	CachesOnDisk     int
	CachesLockMmap   bool
	DatasetDir       string
	DatasetsInMem    int
	DatasetsOnDisk   int
	DatasetsLockMmap bool
	PowMode          Mode

	// When set, notifications sent by the remote sealer will
	// be block header JSON objects instead of work package arrays.
	NotifyFull bool

	Log log.Logger `toml:"-"`
	// ECIP-1099
	ECIP1099Block *uint64 `toml:"-"`
}

Config are the configuration parameters of the ethash.

type Ethash 

type Ethash struct {
	// contains filtered or unexported fields
}

Ethash is a consensus engine based on proof-of-work implementing the ethash algorithm.

func New 

func New(config Config, notify []string, noverify bool) *Ethash

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 NewFakeDelayer 

func NewFakeDelayer(delay time.Duration) *Ethash

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 NewFakeFailer 

func NewFakeFailer(fail uint64) *Ethash

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 NewFaker 

func NewFaker() *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 NewFullFaker 

func NewFullFaker() *Ethash

NewFullFaker creates an ethash consensus engine with a full fake scheme that accepts all blocks as valid, without checking any consensus rules whatsoever.

func NewPoissonFaker 

func NewPoissonFaker() *Ethash

NewPoissonFaker creates a ethash consensus engine with a fake PoW scheme that accepts all blocks as valid, but delays mining by some time based on miner.threads, though they still have to conform to the Ethereum consensus rules.

func NewShared 

func NewShared() *Ethash

NewShared creates a full sized ethash PoW shared between all requesters running in the same process.

func NewTester 

func NewTester(notify []string, noverify bool) *Ethash

NewTester creates a small sized ethash PoW scheme useful only for testing purposes.

func (*Ethash) APIs 

func (ethash *Ethash) APIs(chain consensus.ChainHeaderReader) []rpc.API

APIs implements consensus.Engine, returning the user facing RPC APIs.

func (*Ethash) Author 

func (ethash *Ethash) Author(header *types.Header) (common.Address, error)

Author implements consensus.Engine, returning the header's coinbase as the proof-of-work verified author of the block.

func (*Ethash) Cache added in v0.0.4 

func (ethash *Ethash) Cache(block uint64) *Cache

func (*Ethash) CalcDifficulty 

func (ethash *Ethash) CalcDifficulty(chain consensus.ChainHeaderReader, time uint64, parent *types.Header) *big.Int

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) Close 

func (ethash *Ethash) Close() error

Close closes the exit channel to notify all backend threads exiting.

func (*Ethash) Finalize 

func (ethash *Ethash) Finalize(chain consensus.ChainHeaderReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header, withdrawals []*types.Withdrawal)

Finalize implements consensus.Engine, accumulating the block and uncle rewards.

func (*Ethash) FinalizeAndAssemble 

func (ethash *Ethash) FinalizeAndAssemble(chain consensus.ChainHeaderReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header, receipts []*types.Receipt, withdrawals []*types.Withdrawal) (*types.Block, error)

FinalizeAndAssemble implements consensus.Engine, accumulating the block and uncle rewards, setting the final state and assembling the block.

func (*Ethash) Hashrate 

func (ethash *Ethash) Hashrate() float64

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) Prepare 

func (ethash *Ethash) Prepare(chain consensus.ChainHeaderReader, header *types.Header) error

Prepare implements consensus.Engine, initializing the difficulty field of a header to conform to the ethash protocol. The changes are done inline.

func (*Ethash) Seal 

func (ethash *Ethash) Seal(chain consensus.ChainHeaderReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error

Seal implements consensus.Engine, attempting to find a nonce that satisfies the block's difficulty requirements.

func (*Ethash) SealHash 

func (ethash *Ethash) SealHash(header *types.Header) (hash common.Hash)

SealHash returns the hash of a block prior to it being sealed.

func (*Ethash) SetThreads 

func (ethash *Ethash) SetThreads(threads int)

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) StopRemoteSealer 

func (ethash *Ethash) StopRemoteSealer() error

StopRemoteSealer stops the remote sealer

func (*Ethash) Threads 

func (ethash *Ethash) Threads() int

Threads returns the number of mining threads currently enabled. This doesn't necessarily mean that mining is running!

func (*Ethash) VerifyHeader 

func (ethash *Ethash) VerifyHeader(chain consensus.ChainHeaderReader, header *types.Header, seal bool) error

VerifyHeader checks whether a header conforms to the consensus rules of the stock Ethereum ethash engine.

func (*Ethash) VerifyHeaders 

func (ethash *Ethash) VerifyHeaders(chain consensus.ChainHeaderReader, headers []*types.Header, seals []bool) (chan<- struct{}, <-chan error)

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) VerifyUncles 

func (ethash *Ethash) VerifyUncles(chain consensus.ChainReader, block *types.Block) error

VerifyUncles verifies that the given block's uncles conform to the consensus rules of the stock Ethereum ethash engine.

type Mode 

type Mode uint

Mode defines the type and amount of PoW verification an ethash engine makes. 

const (
	ModeNormal Mode = iota
	ModeShared
	ModeTest
	ModeFake
	ModePoissonFake
	ModeFullFake
)

func (Mode) String 

func (m Mode) String() string

Source Files

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