mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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224 lines
7.1 KiB
Go
224 lines
7.1 KiB
Go
// Copyright 2014 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 miner implements Ethereum block creation and mining.
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package miner
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import (
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"fmt"
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"math/big"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/consensus"
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"github.com/ethereum/go-ethereum/core"
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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/eth/downloader"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/params"
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)
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// Backend wraps all methods required for mining.
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type Backend interface {
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BlockChain() *core.BlockChain
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TxPool() *core.TxPool
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}
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// Config is the configuration parameters of mining.
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type Config struct {
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Etherbase common.Address `toml:",omitempty"` // Public address for block mining rewards (default = first account)
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Notify []string `toml:",omitempty"` // HTTP URL list to be notified of new work packages (only useful in ethash).
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NotifyFull bool `toml:",omitempty"` // Notify with pending block headers instead of work packages
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ExtraData hexutil.Bytes `toml:",omitempty"` // Block extra data set by the miner
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GasFloor uint64 // Target gas floor for mined blocks.
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GasCeil uint64 // Target gas ceiling for mined blocks.
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GasPrice *big.Int // Minimum gas price for mining a transaction
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Recommit time.Duration // The time interval for miner to re-create mining work.
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Noverify bool // Disable remote mining solution verification(only useful in ethash).
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}
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// Miner creates blocks and searches for proof-of-work values.
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type Miner struct {
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mux *event.TypeMux
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worker *worker
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coinbase common.Address
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eth Backend
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engine consensus.Engine
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exitCh chan struct{}
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startCh chan common.Address
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stopCh chan struct{}
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}
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func New(eth Backend, config *Config, chainConfig *params.ChainConfig, mux *event.TypeMux, engine consensus.Engine, isLocalBlock func(block *types.Block) bool) *Miner {
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miner := &Miner{
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eth: eth,
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mux: mux,
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engine: engine,
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exitCh: make(chan struct{}),
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startCh: make(chan common.Address),
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stopCh: make(chan struct{}),
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worker: newWorker(config, chainConfig, engine, eth, mux, isLocalBlock, true),
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}
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go miner.update()
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return miner
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}
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// update keeps track of the downloader events. Please be aware that this is a one shot type of update loop.
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// It's entered once and as soon as `Done` or `Failed` has been broadcasted the events are unregistered and
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// the loop is exited. This to prevent a major security vuln where external parties can DOS you with blocks
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// and halt your mining operation for as long as the DOS continues.
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func (miner *Miner) update() {
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events := miner.mux.Subscribe(downloader.StartEvent{}, downloader.DoneEvent{}, downloader.FailedEvent{})
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defer func() {
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if !events.Closed() {
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events.Unsubscribe()
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}
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}()
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shouldStart := false
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canStart := true
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dlEventCh := events.Chan()
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for {
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select {
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case ev := <-dlEventCh:
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if ev == nil {
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// Unsubscription done, stop listening
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dlEventCh = nil
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continue
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}
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switch ev.Data.(type) {
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case downloader.StartEvent:
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wasMining := miner.Mining()
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miner.worker.stop()
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canStart = false
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if wasMining {
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// Resume mining after sync was finished
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shouldStart = true
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log.Info("Mining aborted due to sync")
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}
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case downloader.FailedEvent:
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canStart = true
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if shouldStart {
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miner.SetEtherbase(miner.coinbase)
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miner.worker.start()
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}
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case downloader.DoneEvent:
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canStart = true
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if shouldStart {
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miner.SetEtherbase(miner.coinbase)
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miner.worker.start()
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}
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// Stop reacting to downloader events
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events.Unsubscribe()
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}
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case addr := <-miner.startCh:
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miner.SetEtherbase(addr)
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if canStart {
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miner.worker.start()
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}
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shouldStart = true
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case <-miner.stopCh:
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shouldStart = false
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miner.worker.stop()
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case <-miner.exitCh:
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miner.worker.close()
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return
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}
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}
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}
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func (miner *Miner) Start(coinbase common.Address) {
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miner.startCh <- coinbase
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}
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func (miner *Miner) Stop() {
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miner.stopCh <- struct{}{}
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}
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func (miner *Miner) Close() {
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close(miner.exitCh)
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}
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func (miner *Miner) Mining() bool {
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return miner.worker.isRunning()
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}
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func (miner *Miner) Hashrate() uint64 {
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if pow, ok := miner.engine.(consensus.PoW); ok {
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return uint64(pow.Hashrate())
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}
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return 0
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}
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func (miner *Miner) SetExtra(extra []byte) error {
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if uint64(len(extra)) > params.MaximumExtraDataSize {
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return fmt.Errorf("extra exceeds max length. %d > %v", len(extra), params.MaximumExtraDataSize)
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}
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miner.worker.setExtra(extra)
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return nil
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}
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// SetRecommitInterval sets the interval for sealing work resubmitting.
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func (miner *Miner) SetRecommitInterval(interval time.Duration) {
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miner.worker.setRecommitInterval(interval)
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}
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// Pending returns the currently pending block and associated state.
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func (miner *Miner) Pending() (*types.Block, *state.StateDB) {
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return miner.worker.pending()
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}
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// PendingBlock returns the currently pending block.
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//
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// Note, to access both the pending block and the pending state
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// simultaneously, please use Pending(), as the pending state can
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// change between multiple method calls
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func (miner *Miner) PendingBlock() *types.Block {
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return miner.worker.pendingBlock()
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}
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func (miner *Miner) SetEtherbase(addr common.Address) {
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miner.coinbase = addr
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miner.worker.setEtherbase(addr)
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}
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// EnablePreseal turns on the preseal mining feature. It's enabled by default.
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// Note this function shouldn't be exposed to API, it's unnecessary for users
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// (miners) to actually know the underlying detail. It's only for outside project
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// which uses this library.
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func (miner *Miner) EnablePreseal() {
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miner.worker.enablePreseal()
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}
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// DisablePreseal turns off the preseal mining feature. It's necessary for some
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// fake consensus engine which can seal blocks instantaneously.
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// Note this function shouldn't be exposed to API, it's unnecessary for users
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// (miners) to actually know the underlying detail. It's only for outside project
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// which uses this library.
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func (miner *Miner) DisablePreseal() {
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miner.worker.disablePreseal()
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}
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// SubscribePendingLogs starts delivering logs from pending transactions
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// to the given channel.
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func (miner *Miner) SubscribePendingLogs(ch chan<- []*types.Log) event.Subscription {
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return miner.worker.pendingLogsFeed.Subscribe(ch)
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}
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