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85 lines
3.1 KiB
85 lines
3.1 KiB
// 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 ethash implements the ethash proof-of-work consensus engine.
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package ethash
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import (
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"time"
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"github.com/ethereum/go-ethereum/consensus"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// Ethash is a consensus engine based on proof-of-work implementing the ethash
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// algorithm.
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type Ethash struct {
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fakeFail *uint64 // Block number which fails PoW check even in fake mode
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fakeDelay *time.Duration // Time delay to sleep for before returning from verify
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fakeFull bool // Accepts everything as valid
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}
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// NewFaker creates an ethash consensus engine with a fake PoW scheme that accepts
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// all blocks' seal as valid, though they still have to conform to the Ethereum
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// consensus rules.
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func NewFaker() *Ethash {
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return new(Ethash)
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}
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// NewFakeFailer creates a ethash consensus engine with a fake PoW scheme that
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// accepts all blocks as valid apart from the single one specified, though they
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// still have to conform to the Ethereum consensus rules.
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func NewFakeFailer(fail uint64) *Ethash {
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return &Ethash{
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fakeFail: &fail,
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}
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}
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// NewFakeDelayer creates a ethash consensus engine with a fake PoW scheme that
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// accepts all blocks as valid, but delays verifications by some time, though
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// they still have to conform to the Ethereum consensus rules.
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func NewFakeDelayer(delay time.Duration) *Ethash {
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return &Ethash{
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fakeDelay: &delay,
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}
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}
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// NewFullFaker creates an ethash consensus engine with a full fake scheme that
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// accepts all blocks as valid, without checking any consensus rules whatsoever.
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func NewFullFaker() *Ethash {
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return &Ethash{
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fakeFull: true,
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}
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}
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// Close closes the exit channel to notify all backend threads exiting.
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func (ethash *Ethash) Close() error {
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return nil
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}
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// APIs implements consensus.Engine, returning no APIs as ethash is an empty
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// shell in the post-merge world.
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func (ethash *Ethash) APIs(chain consensus.ChainHeaderReader) []rpc.API {
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return []rpc.API{}
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}
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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. For the ethash engine, this method will
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// just panic as sealing is not supported anymore.
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func (ethash *Ethash) Seal(chain consensus.ChainHeaderReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error {
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panic("ethash (pow) sealing not supported any more")
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}
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