Official Go implementation of the Ethereum protocol
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go-ethereum/miner/worker.go

280 lines
6.6 KiB

package miner
import (
"fmt"
"math/big"
"sort"
"sync"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/pow"
"github.com/ethereum/go-ethereum/state"
"gopkg.in/fatih/set.v0"
)
var jsonlogger = logger.NewJsonLogger()
type environment struct {
totalUsedGas *big.Int
state *state.StateDB
coinbase *state.StateObject
block *types.Block
ancestors *set.Set
uncles *set.Set
}
func env(block *types.Block, eth core.Backend) *environment {
state := state.New(block.Root(), eth.StateDb())
env := &environment{
totalUsedGas: new(big.Int),
state: state,
block: block,
ancestors: set.New(),
uncles: set.New(),
coinbase: state.GetOrNewStateObject(block.Coinbase()),
}
for _, ancestor := range eth.ChainManager().GetAncestors(block, 7) {
env.ancestors.Add(ancestor.Hash())
}
return env
}
type Work struct {
Number uint64
Nonce uint64
MixDigest []byte
SeedHash []byte
}
type Agent interface {
Work() chan<- *types.Block
SetWorkCh(chan<- Work)
Stop()
Start()
GetHashRate() int64
}
type worker struct {
mu sync.Mutex
agents []Agent
recv chan Work
mux *event.TypeMux
quit chan struct{}
pow pow.PoW
eth core.Backend
chain *core.ChainManager
proc *core.BlockProcessor
coinbase common.Address
current *environment
mining bool
}
func newWorker(coinbase common.Address, eth core.Backend) *worker {
return &worker{
eth: eth,
mux: eth.EventMux(),
recv: make(chan Work),
chain: eth.ChainManager(),
proc: eth.BlockProcessor(),
coinbase: coinbase,
}
}
func (self *worker) start() {
self.mining = true
self.quit = make(chan struct{})
// spin up agents
for _, agent := range self.agents {
agent.Start()
}
go self.update()
go self.wait()
}
func (self *worker) stop() {
self.mining = false
close(self.quit)
}
func (self *worker) register(agent Agent) {
self.agents = append(self.agents, agent)
agent.SetWorkCh(self.recv)
}
func (self *worker) update() {
events := self.mux.Subscribe(core.ChainHeadEvent{}, core.NewMinedBlockEvent{})
timer := time.NewTicker(2 * time.Second)
out:
for {
select {
case event := <-events.Chan():
switch ev := event.(type) {
case core.ChainHeadEvent:
if self.current.block != ev.Block {
self.commitNewWork()
}
case core.NewMinedBlockEvent:
self.commitNewWork()
}
case <-self.quit:
// stop all agents
for _, agent := range self.agents {
agent.Stop()
}
break out
case <-timer.C:
minerlogger.Infoln("Hash rate:", self.HashRate(), "Khash")
}
}
events.Unsubscribe()
}
func (self *worker) wait() {
for {
for work := range self.recv {
// Someone Successfully Mined!
block := self.current.block
if block.Number().Uint64() == work.Number && block.Nonce() == 0 {
self.current.block.SetNonce(work.Nonce)
self.current.block.Header().MixDigest = common.BytesToHash(work.MixDigest)
jsonlogger.LogJson(&logger.EthMinerNewBlock{
BlockHash: block.Hash().Hex(),
BlockNumber: block.Number(),
ChainHeadHash: block.ParentHeaderHash.Hex(),
BlockPrevHash: block.ParentHeaderHash.Hex(),
})
if err := self.chain.InsertChain(types.Blocks{self.current.block}); err == nil {
self.mux.Post(core.NewMinedBlockEvent{self.current.block})
} else {
self.commitNewWork()
}
}
break
}
}
}
func (self *worker) push() {
if self.mining {
self.current.block.Header().GasUsed = self.current.totalUsedGas
self.current.block.SetRoot(self.current.state.Root())
// push new work to agents
for _, agent := range self.agents {
agent.Work() <- self.current.block
}
}
}
func (self *worker) commitNewWork() {
self.mu.Lock()
defer self.mu.Unlock()
block := self.chain.NewBlock(self.coinbase)
self.current = env(block, self.eth)
parent := self.chain.GetBlock(self.current.block.ParentHash())
self.current.coinbase.SetGasPool(core.CalcGasLimit(parent, self.current.block))
transactions := self.eth.TxPool().GetTransactions()
sort.Sort(types.TxByNonce{transactions})
minerlogger.Infof("committing new work with %d txs\n", len(transactions))
// Keep track of transactions which return errors so they can be removed
var remove types.Transactions
gasLimit:
for i, tx := range transactions {
err := self.commitTransaction(tx)
switch {
case core.IsNonceErr(err):
fallthrough
case core.IsInvalidTxErr(err):
// Remove invalid transactions
from, _ := tx.From()
self.chain.TxState().RemoveNonce(from, tx.Nonce())
remove = append(remove, tx)
minerlogger.Infof("TX (%x) failed, will be removed: %v\n", tx.Hash().Bytes()[:4], err)
minerlogger.Infoln(tx)
case state.IsGasLimitErr(err):
minerlogger.Infof("Gas limit reached for block. %d TXs included in this block\n", i)
// Break on gas limit
break gasLimit
}
}
self.eth.TxPool().RemoveSet(remove)
self.current.state.AddBalance(self.coinbase, core.BlockReward)
self.current.state.Update(common.Big0)
self.push()
}
var (
inclusionReward = new(big.Int).Div(core.BlockReward, big.NewInt(32))
_uncleReward = new(big.Int).Mul(core.BlockReward, big.NewInt(15))
uncleReward = new(big.Int).Div(_uncleReward, big.NewInt(16))
)
func (self *worker) commitUncle(uncle *types.Header) error {
if self.current.uncles.Has(uncle.Hash()) {
// Error not unique
return core.UncleError("Uncle not unique")
}
self.current.uncles.Add(uncle.Hash())
if !self.current.ancestors.Has(uncle.ParentHash) {
return core.UncleError(fmt.Sprintf("Uncle's parent unknown (%x)", uncle.ParentHash[0:4]))
}
if !self.pow.Verify(types.NewBlockWithHeader(uncle)) {
return core.ValidationError("Uncle's nonce is invalid (= %x)", uncle.Nonce)
}
uncleAccount := self.current.state.GetAccount(uncle.Coinbase)
uncleAccount.AddBalance(uncleReward)
self.current.coinbase.AddBalance(uncleReward)
return nil
}
func (self *worker) commitTransaction(tx *types.Transaction) error {
snap := self.current.state.Copy()
receipt, _, err := self.proc.ApplyTransaction(self.current.coinbase, self.current.state, self.current.block, tx, self.current.totalUsedGas, true)
if err != nil && (core.IsNonceErr(err) || state.IsGasLimitErr(err) || core.IsInvalidTxErr(err)) {
self.current.state.Set(snap)
return err
}
self.current.block.AddTransaction(tx)
self.current.block.AddReceipt(receipt)
return nil
}
func (self *worker) HashRate() int64 {
var tot int64
for _, agent := range self.agents {
tot += agent.GetHashRate()
}
return tot
}