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package miner
import (
"fmt"
"math/big"
"sort"
"sync"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/pow"
"github.com/ethereum/go-ethereum/state"
"gopkg.in/fatih/set.v0"
)
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 *eth.Ethereum) *environment {
state := state.New(block.Root(), eth.Db())
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(string(ancestor.Hash()))
}
return env
}
type Work struct {
Number uint64
Nonce []byte
}
type Agent interface {
Work() chan<- *types.Block
SetWorkCh(chan<- Work)
Stop()
Start()
Pow() pow.PoW
}
type worker struct {
mu sync.Mutex
agents []Agent
recv chan Work
mux *event.TypeMux
quit chan struct{}
pow pow.PoW
eth *eth.Ethereum
chain *core.ChainManager
proc *core.BlockProcessor
coinbase []byte
current *environment
mining bool
}
func newWorker(coinbase []byte, eth *eth.Ethereum) *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.ChainEvent{}, core.TxPreEvent{})
out:
for {
select {
case event := <-events.Chan():
switch event.(type) {
case core.ChainEvent, core.TxPreEvent:
self.commitNewWork()
}
case <-self.quit:
// stop all agents
for _, agent := range self.agents {
agent.Stop()
}
break out
}
}
events.Unsubscribe()
}
func (self *worker) wait() {
for {
for work := range self.recv {
block := self.current.block
if block.Number().Uint64() == work.Number && block.Nonce() == nil {
self.current.block.Header().Nonce = work.Nonce
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()
self.current = env(self.chain.NewBlock(self.coinbase), 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})
// Keep track of transactions which return errors so they can be removed
var remove types.Transactions
for _, tx := range transactions {
err := self.commitTransaction(tx)
switch {
case core.IsNonceErr(err):
// Remove invalid transactions
remove = append(remove, tx)
case core.IsGasLimitErr(err):
// Break on gas limit
break
}
if err != nil {
minerlogger.Infoln(err)
}
}
self.eth.TxPool().RemoveSet(remove)
self.current.coinbase.AddAmount(core.BlockReward)
self.current.state.Update(ethutil.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(string(uncle.Hash())) {
// Error not unique
return core.UncleError("Uncle not unique")
}
self.current.uncles.Add(string(uncle.Hash()))
if !self.current.ancestors.Has(string(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 (= %v)", ethutil.Bytes2Hex(uncle.Nonce))
}
uncleAccount := self.current.state.GetAccount(uncle.Coinbase)
uncleAccount.AddAmount(uncleReward)
self.current.coinbase.AddBalance(uncleReward)
return nil
}
func (self *worker) commitTransaction(tx *types.Transaction) error {
snapshot := 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) || core.IsGasLimitErr(err)) {
self.current.state.Set(snapshot)
return err
}
self.current.block.AddTransaction(tx)
self.current.block.AddReceipt(receipt)
return nil
}
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