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Diffstat (limited to 'consensus/consensus.go')
| -rw-r--r-- | consensus/consensus.go | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/consensus/consensus.go b/consensus/consensus.go new file mode 100644 index 000000000..e318e57c0 --- /dev/null +++ b/consensus/consensus.go @@ -0,0 +1,94 @@ +// Copyright 2017 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 consensus implements different Ethereum consensus engines. +package consensus + +import ( + "github.com/ethereum/go-ethereum/common" + "github.com/ethereum/go-ethereum/core/state" + "github.com/ethereum/go-ethereum/core/types" + "github.com/ethereum/go-ethereum/params" + "github.com/ethereum/go-ethereum/rpc" +) + +// ChainReader defines a small collection of methods needed to access the local +// blockchain during header and/or uncle verification. +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 + + // GetBlock retrieves a block from the database by hash and number. + GetBlock(hash common.Hash, number uint64) *types.Block +} + +// Engine is an algorithm agnostic consensus engine. +type Engine interface { + // 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) + + // VerifyUncles verifies that the given block's uncles conform to the consensus + // rules of a given engine. + VerifyUncles(chain ChainReader, block *types.Block) 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, + uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error) + + // Seal generates a new block for the given input block with the local miner's + // seal place on top. + Seal(chain ChainReader, block *types.Block, stop <-chan struct{}) (*types.Block, error) + + // APIs returns the RPC APIs this consensus engine provides. + APIs(chain ChainReader) []rpc.API +} + +// PoW is a consensus engine based on proof-of-work. +type PoW interface { + Engine + + // Hashrate returns the current mining hashrate of a PoW consensus engine. + Hashrate() float64 +} |