From b1870631a4829e075eae77064973ef94aa2166b3 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Wed, 4 Feb 2015 05:52:59 -0800
Subject: WIP miner

---
 miner/worker.go | 164 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 miner/worker.go

(limited to 'miner')

diff --git a/miner/worker.go b/miner/worker.go
new file mode 100644
index 000000000..dbb8a5832
--- /dev/null
+++ b/miner/worker.go
@@ -0,0 +1,164 @@
+package miner
+
+import (
+	"fmt"
+	"math/big"
+	"sort"
+
+	"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 worker struct {
+	agents []chan<- *types.Block
+	mux    *event.TypeMux
+	quit   chan struct{}
+	pow    pow.PoW
+
+	eth      *eth.Ethereum
+	chain    *core.ChainManager
+	proc     *core.BlockProcessor
+	coinbase []byte
+
+	current *environment
+}
+
+func (self *worker) register(agent chan<- *types.Block) {
+	self.agents = append(self.agents, agent)
+}
+
+func (self *worker) update() {
+	events := self.mux.Subscribe(core.NewBlockEvent{}, core.TxPreEvent{}, &LocalTx{})
+
+out:
+	for {
+		select {
+		case event := <-events.Chan():
+			switch event := event.(type) {
+			case core.NewBlockEvent:
+				block := event.Block
+				if self.eth.ChainManager().HasBlock(block.Hash()) {
+				} else if true {
+				}
+			case core.TxPreEvent, *LocalTx:
+			}
+		case <-self.quit:
+			break out
+		}
+	}
+}
+
+func (self *worker) commit() {
+	self.current.state.Update(ethutil.Big0)
+	self.current.block.SetRoot(self.current.state.Root())
+
+	for _, agent := range self.agents {
+		agent <- self.current.block
+	}
+}
+
+func (self *worker) commitNewWork() {
+	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 = append(remove, tx)
+		case core.IsGasLimitErr(err):
+			// ignore
+		default:
+			minerlogger.Infoln(err)
+			remove = append(remove, tx)
+		}
+	}
+	self.eth.TxPool().RemoveSet(remove)
+
+	self.current.coinbase.AddAmount(core.BlockReward)
+
+	self.commit()
+}
+
+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, txGas, err := self.proc.ApplyTransaction(self.current.coinbase, self.current.state, self.current.block, tx, self.current.totalUsedGas, true)
+	if err != nil {
+		self.current.state.Set(snapshot)
+
+		return err
+	}
+
+	self.current.totalUsedGas.Add(self.current.totalUsedGas, txGas)
+	self.current.block.AddTransaction(tx)
+	self.current.block.AddReceipt(receipt)
+
+	return nil
+}
-- 
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