ethash

package
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 Go to latest Published: Feb 27, 2020 License: GPL-3.0 Imports: 40 Imported by: 0

Documentation

Overview

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

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

Index

Constants

This section is empty.

Variables

View Source 
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
	EtherCoreBlockReward      = big.NewInt(1e+18) // Block reward in wei for successfully mining a block upward for EtherCore

	DisinflationRateQuotient = big.NewInt(4) // Disinflation rate quotient for ECIP1017
	DisinflationRateDivisor  = big.NewInt(5) // Disinflation rate divisor for ECIP1017

)

Ethash proof-of-work protocol constants.

View Source 
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 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 Config 

type Config struct {
	CacheDir       string
	CachesInMem    int
	CachesOnDisk   int
	DatasetDir     string
	DatasetsInMem  int
	DatasetsOnDisk int
	PowMode        Mode
	ProgpowBlock   *big.Int // Block number at which to use progpow instead of hashimoto

	Log log.Logger `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 NewShared 

func NewShared(progpowNumber *big.Int) *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.ChainReader) []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) 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) 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.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header)

Finalize implements consensus.Engine, accumulating the block and uncle rewards, setting the final state on the header

func (*Ethash) FinalizeAndAssemble 

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)

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.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, 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) 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
)

Source Files

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