ethash

Documentation

Overview

Copyright 2018 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.

Index

• Variables
• func CalcDifficulty(config *params.ChainConfig, time uint64, parent *types.Header) *big.Int
• func MakeCache(block uint64, dir string)
• func MakeDataset(block uint64, dir string)
• func SeedHash(block uint64) []byte
• type API
  • func (api *API) GetHashrate() uint64
  • func (api *API) GetWork() ([3]string, error)
  • func (api *API) SubmitHashRate(rate hexutil.Uint64, id common.Hash) bool
  • func (api *API) SubmitWork(nonce types.BlockNonce, hash, digest common.Hash) bool
• 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) Close() error
  • 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 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 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() ([3]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

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
}

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 and starts a background thread for remote mining.

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.

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, 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

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
)