ethash

Documentation

Overview

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

Index

• Variables
• func CalcDifficulty(config *params.ChainConfig, time uint64, parent *types.Header) *big.Int
• func GetBlockEra(blockNum, eraLength *big.Int) *big.Int
• func GetBlockUncleRewardByEra(era *big.Int, header, uncle *types.Header, blockReward *big.Int) *big.Int
• func GetBlockWinnerRewardByEra(era *big.Int, blockReward *big.Int) *big.Int
• func GetBlockWinnerRewardForUnclesByEra(era *big.Int, uncles []*types.Header, blockReward *big.Int) *big.Int
• func MakeCache(block uint64, dir string)
• func MakeDataset(block uint64, dir string)
• func SeedHash(block uint64) []byte
• type Config
• type Ethash
  • func New(config Config) *Ethash
  • func NewFakeDelayer(delay time.Duration) *Ethash
  • func NewFakeFailer(fail uint64) *Ethash
  • func NewFaker() *Ethash
  • func NewFullFaker() *Ethash
  • func NewShared() *Ethash
  • func NewTester() *Ethash
  • func (ethash *Ethash) APIs(chain consensus.ChainReader) []rpc.API
  • func (ethash *Ethash) Author(header *types.Header) (common.Address, error)
  • func (ethash *Ethash) CalcDifficulty(chain consensus.ChainReader, time uint64, parent *types.Header) *big.Int
  • func (ethash *Ethash) Finalize(chain consensus.ChainReader, header *types.Header, state *state.StateDB, ...) (*types.Block, error)
  • func (ethash *Ethash) Hashrate() float64
  • func (ethash *Ethash) Prepare(chain consensus.ChainReader, header *types.Header) error
  • func (ethash *Ethash) Seal(chain consensus.ChainReader, block *types.Block, stop <-chan struct{}) (*types.Block, error)
  • func (ethash *Ethash) SetThreads(threads int)
  • func (ethash *Ethash) Threads() int
  • func (ethash *Ethash) VerifyHeader(chain consensus.ChainReader, header *types.Header, seal bool) error
  • func (ethash *Ethash) VerifyHeaders(chain consensus.ChainReader, headers []*types.Header, seals []bool) (chan<- struct{}, <-chan error)
  • func (ethash *Ethash) VerifySeal(chain consensus.ChainReader, header *types.Header) error
  • func (ethash *Ethash) VerifyUncles(chain consensus.ChainReader, block *types.Block) error
• type Mode

Variables

var (
	FrontierBlockReward  *big.Int = big.NewInt(5e+18)                                   // Block reward in wei for successfully mining a block
	ByzantiumBlockReward *big.Int = big.NewInt(3e+18)                                   // Block reward in wei for successfully mining a block upward from Byzantium
	SocialBlockReward    *big.Int = new(big.Int).Mul(big.NewInt(50), big.NewInt(1e+18)) // Block reward in wei for successfully mining a block upward for Ethereum Social

	DisinflationRateQuotient = big.NewInt(4)      // Disinflation rate quotient for ECIP1017
	DisinflationRateDivisor  = big.NewInt(5)      // Disinflation rate divisor for ECIP1017
	ExpDiffPeriod            = big.NewInt(100000) // Exponential diff period for ECIP1010
)

Ethash proof-of-work protocol constants.

var ErrInvalidDumpMagic = errors.New("invalid dump magic")

Functions

func CalcDifficulty

func CalcDifficulty(config *params.ChainConfig, 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 GetBlockEra

func GetBlockEra(blockNum, eraLength *big.Int) *big.Int

GetBlockEra gets which "Era" a given block is within, given an era length (ecip-1017 has era=5,000,000 blocks) Returns a zero-index era number, so "Era 1": 0, "Era 2": 1, "Era 3": 2 ...

func GetBlockUncleRewardByEra

func GetBlockUncleRewardByEra(era *big.Int, header, uncle *types.Header, blockReward *big.Int) *big.Int

GetBlockUncleRewardByEra gets called _for each uncle miner_ associated with a winner block's uncles.

func GetBlockWinnerRewardByEra

func GetBlockWinnerRewardByEra(era *big.Int, blockReward *big.Int) *big.Int

GetRewardByEra gets a block reward at disinflation rate. Constants MaxBlockReward, DisinflationRateQuotient, and DisinflationRateDivisor assumed.

func GetBlockWinnerRewardForUnclesByEra

func GetBlockWinnerRewardForUnclesByEra(era *big.Int, uncles []*types.Header, blockReward *big.Int) *big.Int

GetBlockWinnerRewardForUnclesByEra gets called _per winner_, and accumulates rewards for each included uncle. Assumes uncles have been validated and limited (@ func (v *BlockValidator) VerifyUncles).

func MakeCache

func MakeCache(block uint64, dir string)

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

func MakeDataset

func MakeDataset(block uint64, dir string)

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

func SeedHash

func SeedHash(block uint64) []byte

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

Types

type Config

type Config struct {
	CacheDir       string
	CachesInMem    int
	CachesOnDisk   int
	DatasetDir     string
	DatasetsInMem  int
	DatasetsOnDisk int
	PowMode        Mode
}

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 proot-of-work implementing the ethash algorithm.

func New

func New(config Config) *Ethash

New creates a full sized ethash PoW scheme.

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 NewShared

func NewShared() *Ethash

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

func NewTester

func NewTester() *Ethash

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

func (*Ethash) APIs

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

APIs implements consensus.Engine, returning the user facing RPC APIs. Currently that is empty.

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) CalcDifficulty

func (ethash *Ethash) CalcDifficulty(chain consensus.ChainReader, 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) Finalize

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

Finalize 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.

func (*Ethash) Prepare

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

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

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) 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.ChainReader, 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.ChainReader, 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) VerifySeal

func (ethash *Ethash) VerifySeal(chain consensus.ChainReader, header *types.Header) error

VerifySeal implements consensus.Engine, checking whether the given block satisfies the PoW difficulty requirements.

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
	ModeFullFake
)