consensus

Documentation

Overview

Package consensus implements different Ethereum consensus engines.

Package consensus implements different Ethereum consensus engines.

Index

• Constants
• Variables
• func Ecrecover(header *types.Header, sigcache *lru.ARCCache) (common.Address, error)
• func SigHash(header *types.Header) (hash common.Hash)
• type Broadcaster
• type ChainReader
• type CostInfo
• type Engine
• type Handler
• type Iris
• type Peer
• type Protocol
• type StatusInfo
  • func (s *StatusInfo) LoadCostInfo() (*CostInfo, error)
  • func (s *StatusInfo) LoadEvent() (*event.TypeMuxSubscription, error)
  • func (s *StatusInfo) StoreCostInfo(info *CostInfo)
  • func (s *StatusInfo) StoreEvent(event *event.TypeMuxSubscription)

Constants

const (
	Eth62 = 62
	Eth63 = 63
)

Constants to match up protocol versions and messages

Variables

var (
	// ErrUnknownAncestor is returned when validating a block requires an ancestor
	// that is unknown.
	ErrUnknownAncestor = errors.New("unknown ancestor")

	// ErrPrunedAncestor is returned when validating a block requires an ancestor
	// that is known, but the state of which is not available.
	ErrPrunedAncestor = errors.New("pruned ancestor")

	// ErrFutureBlock is returned when a block's timestamp is in the future according
	// to the current node.
	ErrFutureBlock = errors.New("block in the future")

	// ErrInvalidNumber is returned if a block's number doesn't equal it's parent's
	// plus one.
	ErrInvalidNumber = errors.New("invalid block number")
)

var (
	ExtraSeal = 65 // Fixed number of extra-data suffix bytes reserved for signer seal
	// ErrMissingSignature is returned if a block's extra-data section doesn't seem
	// to contain a 65 byte secp256k1 signature.
	ErrMissingSignature = errors.New("extra-data 65 byte signature suffix missing")
)

var (
	EthProtocol = Protocol{
		Name:     "eth",
		Versions: []uint{Eth62, Eth63},
		Lengths:  []uint64{17, 8},
	}
)

Functions

func Ecrecover

func Ecrecover(header *types.Header, sigcache *lru.ARCCache) (common.Address, error)

Ecrecover extracts the Ethereum account address from a signed header.

func SigHash

func SigHash(header *types.Header) (hash common.Hash)

SigHash returns the hash which is used as input for the proof-of-authority signing. It is the hash of the entire header apart from the 65 byte signature contained at the end of the extra data.

Note, the method requires the extra data to be at least 65 bytes, otherwise it panics. This is done to avoid accidentally using both forms (signature present or not), which could be abused to produce different hashes for the same header.

Types

type Broadcaster

type Broadcaster interface {
	// Enqueue add a block into fetcher queue
	Enqueue(id string, block *types.Block)
	// FindPeers retrives peers by addresses
	FindPeers(map[common.Address]bool) map[common.Address]Peer
}

Broadcaster defines the interface to enqueue blocks to fetcher and find peer

type ChainReader

type ChainReader interface {
	// Config retrieves the blockchain's chain configuration.
	Config() *params.ChainConfig

	// CurrentHeader retrieves the current header from the local chain.
	CurrentHeader() *types.Header

	// GetHeader retrieves a block header from the database by hash and number.
	GetHeader(hash common.Hash, number uint64) *types.Header

	// GetHeaderByNumber retrieves a block header from the database by number.
	GetHeaderByNumber(number uint64) *types.Header

	// GetHeaderByHash retrieves a block header from the database by its hash.
	GetHeaderByHash(hash common.Hash) *types.Header

	// GetBlock retrieves a block from the database by hash and number.
	GetBlock(hash common.Hash, number uint64) *types.Block

	IsLightNode() bool
}

ChainReader defines a small collection of methods needed to access the local blockchain during header verification.

type CostInfo

type CostInfo struct {
	BlockNum            uint64
	ConsensusCostTime   uint64
	CurrentBlockTxCount uint64
	IsTimeout           bool
	IsUsed              bool //this costInfo whether to use
}

CostInfo consensus cost time

type Engine

type Engine interface {
	// Author retrieves the Ethereum address of the account that minted the given
	// block, which may be different from the header's coinbase if a consensus
	// engine is based on signatures.
	Author(header *types.Header) (common.Address, error)

	// VerifyHeader checks whether a header conforms to the consensus rules of a
	// given engine. Verifying the seal may be done optionally here, or explicitly
	// via the VerifySeal method.
	VerifyHeader(chain ChainReader, header *types.Header, seal bool) 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 (the order is that of
	// the input slice).
	VerifyHeaders(chain ChainReader, headers []*types.Header, seals []bool) (chan<- struct{}, <-chan error)

	// VerifySeal checks whether the crypto seal on a header is valid according to
	// the consensus rules of the given engine.
	VerifySeal(chain ChainReader, header *types.Header) error

	// Prepare initializes the consensus fields of a block header according to the
	// rules of a particular engine. The changes are executed inline.
	Prepare(chain ChainReader, header *types.Header) error

	// Finalize runs any post-transaction state modifications (e.g. block rewards)
	// and assembles the final block.
	// Note: The block header and state database might be updated to reflect any
	// consensus rules that happen at finalization (e.g. block rewards).
	Finalize(chain ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction,
		receipts []*types.Receipt, dag types.DAG) (*types.Block, error)

	// Seal generates a new sealing request for the given input block and pushes
	// the result into the given channel.
	//
	// Note, the method returns immediately and will send the result async. More
	// than one result may also be returned depending on the consensus algorithm.
	Seal(chain ChainReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) (*types.Block, error)

	// SealHash returns the hash of a block prior to it being sealed.
	SealHash(header *types.Header) common.Hash

	// APIs returns the RPC APIs this consensus engine provides.
	APIs(chain ChainReader) []rpc.API

	GetStatusInfo() *StatusInfo

	// Close terminates any background threads maintained by the consensus engine.
	Close() error
}

Engine is an algorithm agnostic consensus engine.

type Handler

type Handler interface {
	// NewChainHead handles a new head block comes
	NewChainHead() error

	// HandleMsg handles a message from peer
	HandleMsg(address common.Address, data p2p.Msg) (bool, error)

	// SetBroadcaster sets the broadcaster to send message to peers
	SetBroadcaster(Broadcaster)
}

Handler should be implemented is the consensus needs to handle and send peer's message

type Iris

type Iris interface {
	Engine

	ShouldSeal() bool

	// Start starts the engine
	Start(chain ChainReader, currentBlock func() *types.Block) error

	// Stop stops the engine
	Stop() error
}

Iris is a consensus engine to avoid byzantine failure

type Peer

type Peer interface {
	// Send sends the message to this peer
	Send(msgcode uint64, data interface{}) error
}

Peer defines the interface to communicate with peer

type Protocol

type Protocol struct {
	// Official short name of the protocol used during capability negotiation.
	Name string
	// Supported versions of the eth protocol (first is primary).
	Versions []uint
	// Number of implemented message corresponding to different protocol versions.
	Lengths []uint64
}

Protocol defines the protocol of the consensus

type StatusInfo

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

func (*StatusInfo) LoadCostInfo

func (s *StatusInfo) LoadCostInfo() (*CostInfo, error)

func (*StatusInfo) LoadEvent

func (s *StatusInfo) LoadEvent() (*event.TypeMuxSubscription, error)

func (*StatusInfo) StoreCostInfo

func (s *StatusInfo) StoreCostInfo(info *CostInfo)

func (*StatusInfo) StoreEvent

func (s *StatusInfo) StoreEvent(event *event.TypeMuxSubscription)