126 lines
5.3 KiB
Go
126 lines
5.3 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package consensus implements different Ethereum consensus engines.
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package consensus
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// ChainReader defines a small collection of methods needed to access the local
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// blockchain during header and/or uncle verification.
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type ChainReader interface {
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// Config retrieves the blockchain's chain configuration.
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Config() *params.ChainConfig
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// CurrentHeader retrieves the current header from the local chain.
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CurrentHeader() *types.Header
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// GetHeader retrieves a block header from the database by hash and number.
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GetHeader(hash common.Hash, number uint64) *types.Header
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// GetHeaderByNumber retrieves a block header from the database by number.
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GetHeaderByNumber(number uint64) *types.Header
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// GetHeaderByHash retrieves a block header from the database by its hash.
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GetHeaderByHash(hash common.Hash) *types.Header
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// GetBlock retrieves a block from the database by hash and number.
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GetBlock(hash common.Hash, number uint64) *types.Block
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}
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// Engine is an algorithm agnostic consensus engine.
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type Engine interface {
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// Author retrieves the Ethereum address of the account that minted the given
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// block, which may be different from the header's coinbase if a consensus
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// engine is based on signatures.
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Author(header *types.Header) (common.Address, error)
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// VerifyHeader checks whether a header conforms to the consensus rules of a
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// given engine. Verifying the seal may be done optionally here, or explicitly
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// via the VerifySeal method.
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VerifyHeader(chain ChainReader, header *types.Header, seal bool) error
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// VerifyHeaders is similar to VerifyHeader, but verifies a batch of headers
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// concurrently. The method returns a quit channel to abort the operations and
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// a results channel to retrieve the async verifications (the order is that of
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// the input slice).
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VerifyHeaders(chain ChainReader, headers []*types.Header, seals []bool) (chan<- struct{}, <-chan error)
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// VerifyUncles verifies that the given block's uncles conform to the consensus
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// rules of a given engine.
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VerifyUncles(chain ChainReader, block *types.Block) error
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// VerifySeal checks whether the crypto seal on a header is valid according to
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// the consensus rules of the given engine.
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VerifySeal(chain ChainReader, header *types.Header) error
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// Prepare initializes the consensus fields of a block header according to the
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// rules of a particular engine. The changes are executed inline.
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Prepare(chain ChainReader, header *types.Header) error
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// Finalize runs any post-transaction state modifications (e.g. block rewards)
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// but does not assemble the block.
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//
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// Note: The block header and state database might be updated to reflect any
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// consensus rules that happen at finalization (e.g. block rewards).
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Finalize(chain ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction,
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uncles []*types.Header)
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// FinalizeAndAssemble runs any post-transaction state modifications (e.g. block
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// rewards) and assembles the final block.
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//
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// Note: The block header and state database might be updated to reflect any
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// consensus rules that happen at finalization (e.g. block rewards).
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FinalizeAndAssemble(chain ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction,
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uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error)
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// Seal generates a new sealing request for the given input block and pushes
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// the result into the given channel.
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//
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// Note, the method returns immediately and will send the result async. More
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// than one result may also be returned depending on the consensus algorithm.
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Seal(chain ChainReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error
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// SealHash returns the hash of a block prior to it being sealed.
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SealHash(header *types.Header) common.Hash
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// CalcDifficulty is the difficulty adjustment algorithm. It returns the difficulty
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// that a new block should have.
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CalcDifficulty(chain ChainReader, time uint64, parent *types.Header) *big.Int
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// APIs returns the RPC APIs this consensus engine provides.
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APIs(chain ChainReader) []rpc.API
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// Close terminates any background threads maintained by the consensus engine.
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Close() error
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}
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// PoW is a consensus engine based on proof-of-work.
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type PoW interface {
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Engine
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// Hashrate returns the current mining hashrate of a PoW consensus engine.
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Hashrate() float64
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}
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