Merge branch 'develop' into release/0.5.15

19 files changed, 521 insertions, 295 deletions

diff --git a/ethchain/block_chain.go b/ethchain/block_chain.go
index 286a158ba..d0fea6641 100644
--- a/ethchain/block_chain.go
+++ b/ethchain/block_chain.go
@@ -2,13 +2,15 @@ package ethchain
 
 import (
 	"bytes"
+	"github.com/ethereum/eth-go/ethlog"
 	"github.com/ethereum/eth-go/ethutil"
 	"github.com/ethereum/eth-go/ethwire"
-	"log"
 	"math"
 	"math/big"
 )
 
+var chainlogger = ethlog.NewLogger("CHAIN")
+
 type BlockChain struct {
 	Ethereum EthManager
 	// The famous, the fabulous Mister GENESIIIIIIS (block)
@@ -129,38 +131,38 @@ func (bc *BlockChain) FindCanonicalChain(blocks []*Block, commonBlockHash []byte
 	// Start with the newest block we got, all the way back to the common block we both know
 	for _, block := range blocks {
 		if bytes.Compare(block.Hash(), commonBlockHash) == 0 {
-			log.Println("[CHAIN] We have found the common parent block, breaking")
+			chainlogger.Infoln("[CHAIN] We have found the common parent block, breaking")
 			break
 		}
 		chainDifficulty.Add(chainDifficulty, bc.CalculateBlockTD(block))
 	}
 
-	log.Println("[CHAIN] Incoming chain difficulty:", chainDifficulty)
+	chainlogger.Infoln("Incoming chain difficulty:", chainDifficulty)
 
 	curChainDifficulty := new(big.Int)
 	block := bc.CurrentBlock
 	for i := 0; block != nil; block = bc.GetBlock(block.PrevHash) {
 		i++
 		if bytes.Compare(block.Hash(), commonBlockHash) == 0 {
-			log.Println("[CHAIN] We have found the common parent block, breaking")
+			chainlogger.Infoln("We have found the common parent block, breaking")
 			break
 		}
 		anOtherBlock := bc.GetBlock(block.PrevHash)
 		if anOtherBlock == nil {
 			// We do not want to count the genesis block for difficulty since that's not being sent
-			log.Println("[CHAIN] At genesis block, breaking")
+			chainlogger.Infoln("At genesis block, breaking")
 			break
 		}
 		curChainDifficulty.Add(curChainDifficulty, bc.CalculateBlockTD(block))
 	}
 
-	log.Println("[CHAIN] Current chain difficulty:", curChainDifficulty)
+	chainlogger.Infoln("Current chain difficulty:", curChainDifficulty)
 	if chainDifficulty.Cmp(curChainDifficulty) == 1 {
-		log.Printf("[CHAIN] The incoming Chain beat our asses, resetting to block: %x", commonBlockHash)
+		chainlogger.Infof("The incoming Chain beat our asses, resetting to block: %x", commonBlockHash)
 		bc.ResetTillBlockHash(commonBlockHash)
 		return false
 	} else {
-		log.Println("[CHAIN] Our chain showed the incoming chain who is boss. Ignoring.")
+		chainlogger.Infoln("Our chain showed the incoming chain who is boss. Ignoring.")
 		return true
 	}
 }
@@ -189,7 +191,7 @@ func (bc *BlockChain) ResetTillBlockHash(hash []byte) error {
 	var block *Block
 	for ; block != nil; block = bc.GetBlock(block.PrevHash) {
 		if bytes.Compare(block.Hash(), hash) == 0 {
-			log.Println("[CHAIN] We have arrived at the the common parent block, breaking")
+			chainlogger.Infoln("We have arrived at the the common parent block, breaking")
 			break
 		}
 		err = ethutil.Config.Db.Delete(block.Hash())
@@ -197,7 +199,7 @@ func (bc *BlockChain) ResetTillBlockHash(hash []byte) error {
 			return err
 		}
 	}
-	log.Println("[CHAIN] Split chain deleted and reverted to common parent block.")
+	chainlogger.Infoln("Split chain deleted and reverted to common parent block.")
 	return nil
 }
 
@@ -226,7 +228,7 @@ func (bc *BlockChain) GetChainFromHash(hash []byte, max uint64) []interface{} {
 		// Get the block of the chain
 		block := bc.GetBlock(currentHash)
 		if block == nil {
-			ethutil.Config.Log.Debugf("Unexpected error during GetChainFromHash: Unable to find %x\n", currentHash)
+			chainlogger.Debugf("Unexpected error during GetChainFromHash: Unable to find %x\n", currentHash)
 			break
 		}
 
@@ -285,7 +287,7 @@ func (bc *BlockChain) setLastBlock() {
 		bc.LastBlockHash = block.Hash()
 		bc.LastBlockNumber = block.Number.Uint64()
 
-		ethutil.Config.Log.Infof("[CHAIN] Last known block height #%d\n", bc.LastBlockNumber)
+		chainlogger.Infof("Last known block height #%d\n", bc.LastBlockNumber)
 	} else {
 		AddTestNetFunds(bc.genesisBlock)
 
@@ -293,14 +295,14 @@ func (bc *BlockChain) setLastBlock() {
 		// Prepare the genesis block
 		bc.Add(bc.genesisBlock)
 
-		//log.Printf("root %x\n", bm.bc.genesisBlock.State().Root)
+		//chainlogger.Infof("root %x\n", bm.bc.genesisBlock.State().Root)
 		//bm.bc.genesisBlock.PrintHash()
 	}
 
 	// Set the last know difficulty (might be 0x0 as initial value, Genesis)
 	bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
 
-	ethutil.Config.Log.Infof("Last block: %x\n", bc.CurrentBlock.Hash())
+	chainlogger.Infof("Last block: %x\n", bc.CurrentBlock.Hash())
 }
 
 func (bc *BlockChain) SetTotalDifficulty(td *big.Int) {
@@ -357,6 +359,6 @@ func (bc *BlockChain) writeBlockInfo(block *Block) {
 
 func (bc *BlockChain) Stop() {
 	if bc.CurrentBlock != nil {
-		log.Println("[CHAIN] Stopped")
+		chainlogger.Infoln("Stopped")
 	}
 }
diff --git a/ethchain/dagger.go b/ethchain/dagger.go
index 565e1e447..08c4826db 100644
--- a/ethchain/dagger.go
+++ b/ethchain/dagger.go
@@ -1,15 +1,17 @@
 package ethchain
 
 import (
+	"github.com/ethereum/eth-go/ethlog"
 	"github.com/ethereum/eth-go/ethutil"
 	"github.com/obscuren/sha3"
 	"hash"
-	"log"
 	"math/big"
 	"math/rand"
 	"time"
 )
 
+var powlogger = ethlog.NewLogger("POW")
+
 type PoW interface {
 	Search(block *Block, reactChan chan ethutil.React) []byte
 	Verify(hash []byte, diff *big.Int, nonce []byte) bool
@@ -29,14 +31,13 @@ func (pow *EasyPow) Search(block *Block, reactChan chan ethutil.React) []byte {
 	for {
 		select {
 		case <-reactChan:
-			//ethutil.Config.Log.Infoln("[POW] Received reactor event; breaking out.")
 			return nil
 		default:
 			i++
 			if i%1234567 == 0 {
 				elapsed := time.Now().UnixNano() - start
 				hashes := ((float64(1e9) / float64(elapsed)) * float64(i)) / 1000
-				ethutil.Config.Log.Infoln("[POW] Hashing @", int64(hashes), "khash")
+				powlogger.Infoln("Hashing @", int64(hashes), "khash")
 			}
 
 			sha := ethutil.Sha3Bin(big.NewInt(r.Int63()).Bytes())
@@ -81,7 +82,7 @@ func (dag *Dagger) Find(obj *big.Int, resChan chan int64) {
 		rnd := r.Int63()
 
 		res := dag.Eval(big.NewInt(rnd))
-		log.Printf("rnd %v\nres %v\nobj %v\n", rnd, res, obj)
+		powlogger.Infof("rnd %v\nres %v\nobj %v\n", rnd, res, obj)
 		if res.Cmp(obj) < 0 {
 			// Post back result on the channel
 			resChan <- rnd
diff --git a/ethchain/state.go b/ethchain/state.go
index a08dfac83..e28b91909 100644
--- a/ethchain/state.go
+++ b/ethchain/state.go
@@ -125,7 +125,7 @@ func (self *State) GetOrNewStateObject(addr []byte) *StateObject {
 }
 
 func (self *State) NewStateObject(addr []byte) *StateObject {
-	ethutil.Config.Log.Printf(ethutil.LogLevelInfo, "(+) %x\n", addr)
+	statelogger.Infof("(+) %x\n", addr)
 
 	stateObject := NewStateObject(addr)
 	self.stateObjects[string(addr)] = stateObject
diff --git a/ethchain/state_manager.go b/ethchain/state_manager.go
index 7444d5180..312ba3084 100644
--- a/ethchain/state_manager.go
+++ b/ethchain/state_manager.go
@@ -3,7 +3,7 @@ package ethchain
 import (
 	"bytes"
 	"container/list"
-	"fmt"
+	"github.com/ethereum/eth-go/ethlog"
 	"github.com/ethereum/eth-go/ethutil"
 	"github.com/ethereum/eth-go/ethwire"
 	"math/big"
@@ -11,6 +11,8 @@ import (
 	"time"
 )
 
+var statelogger = ethlog.NewLogger("STATE")
+
 type BlockProcessor interface {
 	ProcessBlock(block *Block)
 }
@@ -120,7 +122,7 @@ done:
 
 				break done
 			default:
-				ethutil.Config.Log.Infoln(err)
+				statelogger.Infoln(err)
 			}
 		}
 
@@ -172,10 +174,10 @@ func (sm *StateManager) Process(block *Block, dontReact bool) (err error) {
 		if err != nil {
 			if len(receipts) == len(block.Receipts()) {
 				for i, receipt := range block.Receipts() {
-					ethutil.Config.Log.Debugf("diff (r) %v ~ %x  <=>  (c) %v ~ %x (%x)\n", receipt.CumulativeGasUsed, receipt.PostState[0:4], receipts[i].CumulativeGasUsed, receipts[i].PostState[0:4], receipt.Tx.Hash())
+					statelogger.Debugf("diff (r) %v ~ %x  <=>  (c) %v ~ %x (%x)\n", receipt.CumulativeGasUsed, receipt.PostState[0:4], receipts[i].CumulativeGasUsed, receipts[i].PostState[0:4], receipt.Tx.Hash())
 				}
 			} else {
-				ethutil.Config.Log.Debugln("Unable to print receipt diff. Length didn't match", len(receipts), "for", len(block.Receipts()))
+				statelogger.Warnln("Unable to print receipt diff. Length didn't match", len(receipts), "for", len(block.Receipts()))
 			}
 		}
 	}()
@@ -186,19 +188,19 @@ func (sm *StateManager) Process(block *Block, dontReact bool) (err error) {
 
 	// Block validation
 	if err = sm.ValidateBlock(block); err != nil {
-		fmt.Println("[SM] Error validating block:", err)
+		statelogger.Errorln("Error validating block:", err)
 		return err
 	}
 
 	// I'm not sure, but I don't know if there should be thrown
 	// any errors at this time.
 	if err = sm.AccumelateRewards(state, block); err != nil {
-		fmt.Println("[SM] Error accumulating reward", err)
+		statelogger.Errorln("Error accumulating reward", err)
 		return err
 	}
 
 	if !block.State().Cmp(state) {
-		err = fmt.Errorf("Invalid merkle root.\nrec: %x\nis:  %x", block.State().trie.Root, state.trie.Root)
+		statelogger.Errorf("Invalid merkle root.\nrec: %x\nis:  %x", block.State().trie.Root, state.trie.Root)
 		return
 	}
 
@@ -211,7 +213,7 @@ func (sm *StateManager) Process(block *Block, dontReact bool) (err error) {
 		sm.bc.Add(block)
 		sm.notifyChanges(state)
 
-		ethutil.Config.Log.Infof("[STATE] Added block #%d (%x)\n", block.Number, block.Hash())
+		statelogger.Infof("Added block #%d (%x)\n", block.Number, block.Hash())
 		if dontReact == false {
 			sm.Ethereum.Reactor().Post("newBlock", block)
 
@@ -222,7 +224,7 @@ func (sm *StateManager) Process(block *Block, dontReact bool) (err error) {
 
 		sm.Ethereum.TxPool().RemoveInvalid(state)
 	} else {
-		fmt.Println("total diff failed")
+		statelogger.Errorln("total diff failed")
 	}
 
 	return nil
diff --git a/ethchain/state_object.go b/ethchain/state_object.go
index 270c9a7f8..480b4055d 100644
--- a/ethchain/state_object.go
+++ b/ethchain/state_object.go
@@ -130,13 +130,13 @@ func (c *StateObject) ReturnGas(gas, price *big.Int, state *State) {
 func (c *StateObject) AddAmount(amount *big.Int) {
 	c.SetAmount(new(big.Int).Add(c.Amount, amount))
 
-	ethutil.Config.Log.Printf(ethutil.LogLevelInfo, "%x: #%d %v (+ %v)\n", c.Address(), c.Nonce, c.Amount, amount)
+	statelogger.Infof("%x: #%d %v (+ %v)\n", c.Address(), c.Nonce, c.Amount, amount)
 }
 
 func (c *StateObject) SubAmount(amount *big.Int) {
 	c.SetAmount(new(big.Int).Sub(c.Amount, amount))
 
-	ethutil.Config.Log.Printf(ethutil.LogLevelInfo, "%x: #%d %v (- %v)\n", c.Address(), c.Nonce, c.Amount, amount)
+	statelogger.Infof("%x: #%d %v (- %v)\n", c.Address(), c.Nonce, c.Amount, amount)
 }
 
 func (c *StateObject) SetAmount(amount *big.Int) {
@@ -157,7 +157,7 @@ func (c *StateObject) ConvertGas(gas, price *big.Int) error {
 func (self *StateObject) SetGasPool(gasLimit *big.Int) {
 	self.gasPool = new(big.Int).Set(gasLimit)
 
-	ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "%x: fuel (+ %v)", self.Address(), self.gasPool)
+	statelogger.DebugDetailf("%x: fuel (+ %v)", self.Address(), self.gasPool)
 }
 
 func (self *StateObject) BuyGas(gas, price *big.Int) error {
diff --git a/ethchain/state_transition.go b/ethchain/state_transition.go
index 1f5b4f959..f84c3486b 100644
--- a/ethchain/state_transition.go
+++ b/ethchain/state_transition.go
@@ -2,7 +2,6 @@ package ethchain
 
 import (
 	"fmt"
-	"github.com/ethereum/eth-go/ethutil"
 	"math/big"
 )
 
@@ -135,12 +134,12 @@ func (self *StateTransition) preCheck() (err error) {
 }
 
 func (self *StateTransition) TransitionState() (err error) {
-	ethutil.Config.Log.Printf(ethutil.LogLevelInfo, "(~) %x\n", self.tx.Hash())
+	statelogger.Infof("(~) %x\n", self.tx.Hash())
 
 	/*
 		defer func() {
 			if r := recover(); r != nil {
-				ethutil.Config.Log.Infoln(r)
+				logger.Infoln(r)
 				err = fmt.Errorf("state transition err %v", r)
 			}
 		}()
@@ -231,7 +230,7 @@ func (self *StateTransition) transferValue(sender, receiver *StateObject) error
 	// Add the amount to receivers account which should conclude this transaction
 	receiver.AddAmount(self.value)
 
-	//ethutil.Config.Log.Debugf("%x => %x (%v)\n", sender.Address()[:4], receiver.Address()[:4], self.value)
+	//statelogger.Debugf("%x => %x (%v)\n", sender.Address()[:4], receiver.Address()[:4], self.value)
 	//}
 
 	return nil
diff --git a/ethchain/transaction_pool.go b/ethchain/transaction_pool.go
index 24836222a..6ab8d83d9 100644
--- a/ethchain/transaction_pool.go
+++ b/ethchain/transaction_pool.go
@@ -3,15 +3,15 @@ package ethchain
 import (
 	"bytes"
 	"container/list"
-	"errors"
 	"fmt"
-	"github.com/ethereum/eth-go/ethutil"
+	"github.com/ethereum/eth-go/ethlog"
 	"github.com/ethereum/eth-go/ethwire"
-	"log"
 	"math/big"
 	"sync"
 )
 
+var txplogger = ethlog.NewLogger("TXP")
+
 const (
 	txPoolQueueSize = 50
 )
@@ -97,7 +97,7 @@ func (pool *TxPool) ProcessTransaction(tx *Transaction, state *State, toContract
 	fmt.Printf("state root before update %x\n", state.Root())
 	defer func() {
 		if r := recover(); r != nil {
-			ethutil.Config.Log.Infoln(r)
+			txplogger.Infoln(r)
 			err = fmt.Errorf("%v", r)
 		}
 	}()
@@ -156,7 +156,7 @@ func (pool *TxPool) ProcessTransaction(tx *Transaction, state *State, toContract
 		fmt.Printf("state root after receiver update %x\n", state.Root())
 	}
 
-	ethutil.Config.Log.Infof("[TXPL] Processed Tx %x\n", tx.Hash())
+	txplogger.Infof("[TXPL] Processed Tx %x\n", tx.Hash())
 
 	return
 }
@@ -168,7 +168,7 @@ func (pool *TxPool) ValidateTransaction(tx *Transaction) error {
 	block := pool.Ethereum.BlockChain().CurrentBlock
 	// Something has gone horribly wrong if this happens
 	if block == nil {
-		return errors.New("[TXPL] No last block on the block chain")
+		return fmt.Errorf("[TXPL] No last block on the block chain")
 	}
 
 	if len(tx.Recipient) != 20 {
@@ -188,7 +188,7 @@ func (pool *TxPool) ValidateTransaction(tx *Transaction) error {
 
 	if tx.IsContract() {
 		if tx.GasPrice.Cmp(big.NewInt(minGasPrice)) < 0 {
-			return fmt.Errorf("[TXPL] Gasprice to low, %s given should be at least %d.", tx.GasPrice, minGasPrice)
+			return fmt.Errorf("[TXPL] Gasprice too low, %s given should be at least %d.", tx.GasPrice, minGasPrice)
 		}
 	}
 
@@ -215,12 +215,12 @@ out:
 			// Validate the transaction
 			err := pool.ValidateTransaction(tx)
 			if err != nil {
-				ethutil.Config.Log.Debugln("Validating Tx failed", err)
+				txplogger.Debugln("Validating Tx failed", err)
 			} else {
 				// Call blocking version.
 				pool.addTransaction(tx)
 
-				ethutil.Config.Log.Debugf("(t) %x => %x (%v) %x\n", tx.Sender()[:4], tx.Recipient[:4], tx.Value, tx.Hash())
+				txplogger.Debugf("(t) %x => %x (%v) %x\n", tx.Sender()[:4], tx.Recipient[:4], tx.Value, tx.Hash())
 
 				// Notify the subscribers
 				pool.Ethereum.Reactor().Post("newTx:pre", tx)
@@ -282,5 +282,5 @@ func (pool *TxPool) Stop() {
 
 	pool.Flush()
 
-	log.Println("[TXP] Stopped")
+	txplogger.Infoln("Stopped")
 }
diff --git a/ethchain/vm.go b/ethchain/vm.go
index 199eaae50..82591e274 100644
--- a/ethchain/vm.go
+++ b/ethchain/vm.go
@@ -2,11 +2,14 @@ package ethchain
 
 import (
 	"fmt"
+	"github.com/ethereum/eth-go/ethlog"
 	"github.com/ethereum/eth-go/ethutil"
 	"math"
 	"math/big"
 )
 
+var vmlogger = ethlog.NewLogger("VM")
+
 var (
 	GasStep    = big.NewInt(1)
 	GasSha     = big.NewInt(20)
@@ -72,7 +75,7 @@ func (self *Vm) Printf(format string, v ...interface{}) *Vm {
 
 func (self *Vm) Endl() *Vm {
 	if self.Verbose {
-		ethutil.Config.Log.Infoln(self.logStr)
+		vmlogger.Infoln(self.logStr)
 		self.logStr = ""
 	}
 
@@ -93,11 +96,11 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
 		if r := recover(); r != nil {
 			ret = closure.Return(nil)
 			err = fmt.Errorf("%v", r)
-			fmt.Println(err)
+			vmlogger.Errorln("vm err", err)
 		}
 	}()
 
-	ethutil.Config.Log.Debugf("[VM] (~) %x gas: %v (d) %x\n", closure.object.Address(), closure.Gas, closure.Args)
+	vmlogger.Debugf("(~) %x gas: %v (d) %x\n", closure.object.Address(), closure.Gas, closure.Args)
 
 	var (
 		op OpCode
@@ -642,7 +645,7 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
 			args := mem.Get(inOffset.Int64(), inSize.Int64())
 
 			if closure.object.Amount.Cmp(value) < 0 {
-				ethutil.Config.Log.Debugf("Insufficient funds to transfer value. Req %v, has %v", value, closure.object.Amount)
+				vmlogger.Debugf("Insufficient funds to transfer value. Req %v, has %v", value, closure.object.Amount)
 
 				stack.Push(ethutil.BigFalse)
 			} else {
@@ -661,7 +664,7 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
 				if err != nil {
 					stack.Push(ethutil.BigFalse)
 
-					ethutil.Config.Log.Debugf("Closure execution failed. %v\n", err)
+					vmlogger.Debugf("Closure execution failed. %v\n", err)
 
 					vm.err = err
 					vm.state.Set(snapshot)
@@ -696,7 +699,7 @@ func (vm *Vm) RunClosure(closure *Closure, hook DebugHook) (ret []byte, err erro
 
 			return closure.Return(nil), nil
 		default:
-			ethutil.Config.Log.Debugf("Invalid opcode %x\n", op)
+			vmlogger.Debugf("Invalid opcode %x\n", op)
 
 			return closure.Return(nil), fmt.Errorf("Invalid opcode %x", op)
 		}
diff --git a/ethereum.go b/ethereum.go
index 6345f8864..a3df23e92 100644
--- a/ethereum.go
+++ b/ethereum.go
@@ -5,11 +5,11 @@ import (
 	"fmt"
 	"github.com/ethereum/eth-go/ethchain"
 	"github.com/ethereum/eth-go/ethdb"
+	"github.com/ethereum/eth-go/ethlog"
 	"github.com/ethereum/eth-go/ethrpc"
 	"github.com/ethereum/eth-go/ethutil"
 	"github.com/ethereum/eth-go/ethwire"
 	"io/ioutil"
-	"log"
 	"math/rand"
 	"net"
 	"net/http"
@@ -20,6 +20,8 @@ import (
 	"time"
 )
 
+var ethlogger = ethlog.NewLogger("SERV")
+
 func eachPeer(peers *list.List, callback func(*Peer, *list.Element)) {
 	// Loop thru the peers and close them (if we had them)
 	for e := peers.Front(); e != nil; e = e.Next() {
@@ -85,7 +87,7 @@ func New(caps Caps, usePnp bool) (*Ethereum, error) {
 	if usePnp {
 		nat, err = Discover()
 		if err != nil {
-			ethutil.Config.Log.Debugln("UPnP failed", err)
+			ethlogger.Debugln("UPnP failed", err)
 		}
 	}
 
@@ -163,7 +165,7 @@ func (s *Ethereum) AddPeer(conn net.Conn) {
 		if s.peers.Len() < s.MaxPeers {
 			peer.Start()
 		} else {
-			ethutil.Config.Log.Debugf("[SERV] Max connected peers reached. Not adding incoming peer.")
+			ethlogger.Debugf("Max connected peers reached. Not adding incoming peer.")
 		}
 	}
 }
@@ -223,7 +225,7 @@ func (s *Ethereum) ConnectToPeer(addr string) error {
 
 			if phost == chost {
 				alreadyConnected = true
-				//ethutil.Config.Log.Debugf("[SERV] Peer %s already added.\n", chost)
+				//ethlogger.Debugf("Peer %s already added.\n", chost)
 				return
 			}
 		})
@@ -340,12 +342,12 @@ func (s *Ethereum) Start(seed bool) {
 	// Bind to addr and port
 	ln, err := net.Listen("tcp", ":"+s.Port)
 	if err != nil {
-		ethutil.Config.Log.Infof("port=%s in use. Connection listening disabled.")
+		ethlogger.Warnf("Port %s in use. Connection listening disabled. Acting as client", s.Port)
 		s.listening = false
 	} else {
 		s.listening = true
 		// Starting accepting connections
-		ethutil.Config.Log.Infoln("Ready and accepting connections")
+		ethlogger.Infoln("Ready and accepting connections")
 		// Start the peer handler
 		go s.peerHandler(ln)
 	}
@@ -360,10 +362,11 @@ func (s *Ethereum) Start(seed bool) {
 	if seed {
 		s.Seed()
 	}
+	ethlogger.Infoln("Server started")
 }
 
 func (s *Ethereum) Seed() {
-	ethutil.Config.Log.Debugln("[SERV] Retrieving seed nodes")
+	ethlogger.Debugln("Retrieving seed nodes")
 
 	// Eth-Go Bootstrapping
 	ips, er := net.LookupIP("seed.bysh.me")
@@ -371,7 +374,7 @@ func (s *Ethereum) Seed() {
 		peers := []string{}
 		for _, ip := range ips {
 			node := fmt.Sprintf("%s:%d", ip.String(), 30303)
-			ethutil.Config.Log.Debugln("[SERV] Found DNS Go Peer:", node)
+			ethlogger.Debugln("Found DNS Go Peer:", node)
 			peers = append(peers, node)
 		}
 		s.ProcessPeerList(peers)
@@ -391,11 +394,11 @@ func (s *Ethereum) Seed() {
 				for _, a := range addr {
 					// Build string out of SRV port and Resolved IP
 					peer := net.JoinHostPort(a, port)
-					ethutil.Config.Log.Debugln("[SERV] Found DNS Bootstrap Peer:", peer)
+					ethlogger.Debugln("Found DNS Bootstrap Peer:", peer)
 					peers = append(peers, peer)
 				}
 			} else {
-				ethutil.Config.Log.Debugln("[SERV] Couldn't resolve :", target)
+				ethlogger.Debugln("Couldn't resolve :", target)
 			}
 		}
 		// Connect to Peer list
@@ -404,13 +407,13 @@ func (s *Ethereum) Seed() {
 		// Fallback to servers.poc3.txt
 		resp, err := http.Get("http://www.ethereum.org/servers.poc3.txt")
 		if err != nil {
-			log.Println("Fetching seed failed:", err)
+			ethlogger.Warnln("Fetching seed failed:", err)
 			return
 		}
 		defer resp.Body.Close()
 		body, err := ioutil.ReadAll(resp.Body)
 		if err != nil {
-			log.Println("Reading seed failed:", err)
+			ethlogger.Warnln("Reading seed failed:", err)
 			return
 		}
 
@@ -422,7 +425,7 @@ func (s *Ethereum) peerHandler(listener net.Listener) {
 	for {
 		conn, err := listener.Accept()
 		if err != nil {
-			ethutil.Config.Log.Debugln(err)
+			ethlogger.Debugln(err)
 
 			continue
 		}
@@ -447,6 +450,7 @@ func (s *Ethereum) Stop() {
 	s.txPool.Stop()
 	s.stateManager.Stop()
 
+	ethlogger.Infoln("Server stopped")
 	close(s.shutdownChan)
 }
 
@@ -468,13 +472,13 @@ out:
 			var err error
 			_, err = s.nat.AddPortMapping("TCP", int(lport), int(lport), "eth listen port", 20*60)
 			if err != nil {
-				ethutil.Config.Log.Debugln("can't add UPnP port mapping:", err)
+				ethlogger.Debugln("can't add UPnP port mapping:", err)
 				break out
 			}
 			if first && err == nil {
 				_, err = s.nat.GetExternalAddress()
 				if err != nil {
-					ethutil.Config.Log.Debugln("UPnP can't get external address:", err)
+					ethlogger.Debugln("UPnP can't get external address:", err)
 					continue out
 				}
 				first = false
@@ -488,8 +492,8 @@ out:
 	timer.Stop()
 
 	if err := s.nat.DeletePortMapping("TCP", int(lport), int(lport)); err != nil {
-		ethutil.Config.Log.Debugln("unable to remove UPnP port mapping:", err)
+		ethlogger.Debugln("unable to remove UPnP port mapping:", err)
 	} else {
-		ethutil.Config.Log.Debugln("succesfully disestablished UPnP port mapping")
+		ethlogger.Debugln("succesfully disestablished UPnP port mapping")
 	}
 }
diff --git a/ethlog/README.md b/ethlog/README.md
new file mode 100644
index 000000000..d9b69e106
--- /dev/null
+++ b/ethlog/README.md
@@ -0,0 +1,62 @@
+## Features
+
+- packages use tagged logger sending log messages to shared (process-wide) logging engine
+- log writers (interface ethlog.LogSystem) can be added to the logging engine by wrappers/guis/clients
+- shared logging engine dispatching to multiple log systems
+- log level can be set separately per log system
+- async logging thread: logging IO does not block main thread 
+- log messages are synchronously stringified to avoid incorrectly logging of changed states 
+- log level enum: ethlog.LogLevel:   Silence, ErrorLevel, WarnLevel, InfoLevel, DebugLevel, DebugDetailLevel
+
+## Usage
+
+In an ethereum component package:
+
+    import "github.com/ethereum/eth-go/ethlog"
+
+    // package-wide logger using tag
+    var logger = ethlog.NewLogger("TAG")
+
+Logger provides named Printf and Println style methods for all loglevels
+
+    logger.Infoln("this is info") # > [TAG] This is info
+    logger.Infof("this %v is info", object) # > [TAG] This object is info
+
+Ethereum wrappers should register log systems conforming to ethlog.LogSystem
+
+    import "github.com/ethereum/eth-go/ethlog"
+    
+    type CustomLogWriter struct {
+      logLevel ethlog.LogLevel
+    }
+
+    func (t *TestLogSystem) SetLogLevel(i LogLevel) {
+      t.level = i
+    }
+
+    func (t *TestLogSystem) GetLogLevel() LogLevel {
+      return t.level
+    }
+
+    func (c *CustomLogWriter) Printf(format string, v...interface{}) {
+      //....
+    }
+
+    func (c *CustomLogWriter) Println(v...interface{}) {
+      //....
+    }
+
+    ethlog.AddLogWriter(&CustomLogWriter{})
+
+ethlog also provides constructors for that wrap io.Writers into a standard logger with a settable level:
+
+    filename := "test.log"
+    file, _ := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, os.ModePerm)
+    fileLogSystem := NewStdLogSystem(file, 0, WarnLevel)
+    AddLogSystem(fileLogSystem)
+    stdOutLogSystem := NewStdLogSystem(os.Stdout, 0, WarnLevel)
+    AddLogSystem(stdOutLogSystem)
+
+
+
+
diff --git a/ethlog/loggers.go b/ethlog/loggers.go
new file mode 100644
index 000000000..9ebe59096
--- /dev/null
+++ b/ethlog/loggers.go
@@ -0,0 +1,188 @@
+package ethlog
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"sync"
+)
+
+type LogSystem interface {
+	GetLogLevel() LogLevel
+	SetLogLevel(i LogLevel)
+	Println(v ...interface{})
+	Printf(format string, v ...interface{})
+}
+
+type logMessage struct {
+	LogLevel LogLevel
+	format   bool
+	msg      string
+}
+
+func newPrintlnLogMessage(level LogLevel, tag string, v ...interface{}) *logMessage {
+	return &logMessage{level, false, fmt.Sprintf("[%s] %s", tag, fmt.Sprint(v...))}
+}
+
+func newPrintfLogMessage(level LogLevel, tag string, format string, v ...interface{}) *logMessage {
+	return &logMessage{level, true, fmt.Sprintf("[%s] %s", tag, fmt.Sprintf(format, v...))}
+}
+
+func (msg *logMessage) send(logger LogSystem) {
+	if msg.format {
+		logger.Printf(msg.msg)
+	} else {
+		logger.Println(msg.msg)
+	}
+}
+
+var logMessages chan (*logMessage)
+var logSystems []LogSystem
+var drained = true
+
+type LogLevel uint8
+
+const (
+	Silence LogLevel = iota
+	ErrorLevel
+	WarnLevel
+	InfoLevel
+	DebugLevel
+	DebugDetailLevel
+)
+
+// log messages are dispatched to log writers
+func start() {
+	for {
+		select {
+		case msg := <-logMessages:
+			for _, logSystem := range logSystems {
+				if logSystem.GetLogLevel() >= msg.LogLevel {
+					msg.send(logSystem)
+				}
+			}
+		default:
+			drained = true
+		}
+	}
+}
+
+// waits until log messages are drained (dispatched to log writers)
+func Flush() {
+	for !drained {
+	}
+}
+
+type Logger struct {
+	tag string
+}
+
+func NewLogger(tag string) *Logger {
+	return &Logger{tag}
+}
+
+func AddLogSystem(logSystem LogSystem) {
+	var mutex = &sync.Mutex{}
+	mutex.Lock()
+	defer mutex.Unlock()
+	if logSystems == nil {
+		logMessages = make(chan *logMessage)
+		go start()
+	}
+	logSystems = append(logSystems, logSystem)
+}
+
+func (logger *Logger) sendln(level LogLevel, v ...interface{}) {
+	if logMessages != nil {
+		msg := newPrintlnLogMessage(level, logger.tag, v...)
+		drained = false
+		logMessages <- msg
+	}
+}
+
+func (logger *Logger) sendf(level LogLevel, format string, v ...interface{}) {
+	if logMessages != nil {
+		msg := newPrintfLogMessage(level, logger.tag, format, v...)
+		drained = false
+		logMessages <- msg
+	}
+}
+
+func (logger *Logger) Errorln(v ...interface{}) {
+	logger.sendln(ErrorLevel, v...)
+}
+
+func (logger *Logger) Warnln(v ...interface{}) {
+	logger.sendln(WarnLevel, v...)
+}
+
+func (logger *Logger) Infoln(v ...interface{}) {
+	logger.sendln(InfoLevel, v...)
+}
+
+func (logger *Logger) Debugln(v ...interface{}) {
+	logger.sendln(DebugLevel, v...)
+}
+
+func (logger *Logger) DebugDetailln(v ...interface{}) {
+	logger.sendln(DebugDetailLevel, v...)
+}
+
+func (logger *Logger) Errorf(format string, v ...interface{}) {
+	logger.sendf(ErrorLevel, format, v...)
+}
+
+func (logger *Logger) Warnf(format string, v ...interface{}) {
+	logger.sendf(WarnLevel, format, v...)
+}
+
+func (logger *Logger) Infof(format string, v ...interface{}) {
+	logger.sendf(InfoLevel, format, v...)
+}
+
+func (logger *Logger) Debugf(format string, v ...interface{}) {
+	logger.sendf(DebugLevel, format, v...)
+}
+
+func (logger *Logger) DebugDetailf(format string, v ...interface{}) {
+	logger.sendf(DebugDetailLevel, format, v...)
+}
+
+func (logger *Logger) Fatalln(v ...interface{}) {
+	logger.sendln(ErrorLevel, v...)
+	Flush()
+	os.Exit(0)
+}
+
+func (logger *Logger) Fatalf(format string, v ...interface{}) {
+	logger.sendf(ErrorLevel, format, v...)
+	Flush()
+	os.Exit(0)
+}
+
+type StdLogSystem struct {
+	logger *log.Logger
+	level  LogLevel
+}
+
+func (t *StdLogSystem) Println(v ...interface{}) {
+	t.logger.Println(v...)
+}
+
+func (t *StdLogSystem) Printf(format string, v ...interface{}) {
+	t.logger.Printf(format, v...)
+}
+
+func (t *StdLogSystem) SetLogLevel(i LogLevel) {
+	t.level = i
+}
+
+func (t *StdLogSystem) GetLogLevel() LogLevel {
+	return t.level
+}
+
+func NewStdLogSystem(writer io.Writer, flags int, level LogLevel) *StdLogSystem {
+	logger := log.New(writer, "", flags)
+	return &StdLogSystem{logger, level}
+}
diff --git a/ethlog/loggers_test.go b/ethlog/loggers_test.go
new file mode 100644
index 000000000..89f416681
--- /dev/null
+++ b/ethlog/loggers_test.go
@@ -0,0 +1,109 @@
+package ethlog
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+type TestLogSystem struct {
+	Output string
+	level  LogLevel
+}
+
+func (t *TestLogSystem) Println(v ...interface{}) {
+	t.Output += fmt.Sprintln(v...)
+}
+
+func (t *TestLogSystem) Printf(format string, v ...interface{}) {
+	t.Output += fmt.Sprintf(format, v...)
+}
+
+func (t *TestLogSystem) SetLogLevel(i LogLevel) {
+	t.level = i
+}
+
+func (t *TestLogSystem) GetLogLevel() LogLevel {
+	return t.level
+}
+
+func quote(s string) string {
+	return fmt.Sprintf("'%s'", s)
+}
+
+func TestLoggerPrintln(t *testing.T) {
+	logger := NewLogger("TEST")
+	testLogSystem := &TestLogSystem{level: WarnLevel}
+	AddLogSystem(testLogSystem)
+	logger.Errorln("error")
+	logger.Warnln("warn")
+	logger.Infoln("info")
+	logger.Debugln("debug")
+	Flush()
+	output := testLogSystem.Output
+	fmt.Println(quote(output))
+	if output != "[TEST] error\n[TEST] warn\n" {
+		t.Error("Expected logger output '[TEST] error\\n[TEST] warn\\n', got ", quote(testLogSystem.Output))
+	}
+}
+
+func TestLoggerPrintf(t *testing.T) {
+	logger := NewLogger("TEST")
+	testLogSystem := &TestLogSystem{level: WarnLevel}
+	AddLogSystem(testLogSystem)
+	logger.Errorf("error to %v\n", *testLogSystem)
+	logger.Warnf("warn")
+	logger.Infof("info")
+	logger.Debugf("debug")
+	Flush()
+	output := testLogSystem.Output
+	fmt.Println(quote(output))
+	if output != "[TEST] error to { 2}\n[TEST] warn" {
+		t.Error("Expected logger output '[TEST] error to { 2}\\n[TEST] warn', got ", quote(testLogSystem.Output))
+	}
+}
+
+func TestMultipleLogSystems(t *testing.T) {
+	logger := NewLogger("TEST")
+	testLogSystem0 := &TestLogSystem{level: ErrorLevel}
+	testLogSystem1 := &TestLogSystem{level: WarnLevel}
+	AddLogSystem(testLogSystem0)
+	AddLogSystem(testLogSystem1)
+	logger.Errorln("error")
+	logger.Warnln("warn")
+	Flush()
+	output0 := testLogSystem0.Output
+	output1 := testLogSystem1.Output
+	if output0 != "[TEST] error\n" {
+		t.Error("Expected logger 0 output '[TEST] error\\n', got ", quote(testLogSystem0.Output))
+	}
+	if output1 != "[TEST] error\n[TEST] warn\n" {
+		t.Error("Expected logger 1 output '[TEST] error\\n[TEST] warn\\n', got ", quote(testLogSystem1.Output))
+	}
+}
+
+func TestFileLogSystem(t *testing.T) {
+	logger := NewLogger("TEST")
+	filename := "test.log"
+	file, _ := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, os.ModePerm)
+	testLogSystem := NewStdLogSystem(file, 0, WarnLevel)
+	AddLogSystem(testLogSystem)
+	logger.Errorf("error to %s\n", filename)
+	logger.Warnln("warn")
+	Flush()
+	contents, _ := ioutil.ReadFile(filename)
+	output := string(contents)
+	fmt.Println(quote(output))
+	if output != "[TEST] error to test.log\n[TEST] warn\n" {
+		t.Error("Expected contents of file 'test.log': '[TEST] error to test.log\\n[TEST] warn\\n', got ", quote(output))
+	} else {
+		os.Remove(filename)
+	}
+}
+
+func TestNoLogSystem(t *testing.T) {
+	logger := NewLogger("TEST")
+	logger.Warnln("warn")
+	Flush()
+}
diff --git a/ethminer/miner.go b/ethminer/miner.go
index 4343b4333..66388723e 100644
--- a/ethminer/miner.go
+++ b/ethminer/miner.go
@@ -3,11 +3,14 @@ package ethminer
 import (
 	"bytes"
 	"github.com/ethereum/eth-go/ethchain"
+	"github.com/ethereum/eth-go/ethlog"
 	"github.com/ethereum/eth-go/ethutil"
 	"github.com/ethereum/eth-go/ethwire"
 	"sort"
 )
 
+var logger = ethlog.NewLogger("MINER")
+
 type Miner struct {
 	pow         ethchain.PoW
 	ethereum    ethchain.EthManager
@@ -54,23 +57,28 @@ func NewDefaultMiner(coinbase []byte, ethereum ethchain.EthManager) Miner {
 
 	return miner
 }
+
 func (miner *Miner) Start() {
 	// Prepare inital block
 	//miner.ethereum.StateManager().Prepare(miner.block.State(), miner.block.State())
 	go miner.listener()
+	logger.Infoln("Started")
 }
+
 func (miner *Miner) listener() {
 out:
 	for {
 		select {
 		case <-miner.quitChan:
+			logger.Infoln("Stopped")
 			break out
 		case chanMessage := <-miner.reactChan:
+
 			if block, ok := chanMessage.Resource.(*ethchain.Block); ok {
-				//ethutil.Config.Log.Infoln("[MINER] Got new block via Reactor")
+				//logger.Infoln("Got new block via Reactor")
 				if bytes.Compare(miner.ethereum.BlockChain().CurrentBlock.Hash(), block.Hash()) == 0 {
 					// TODO: Perhaps continue mining to get some uncle rewards
-					//ethutil.Config.Log.Infoln("[MINER] New top block found resetting state")
+					//logger.Infoln("New top block found resetting state")
 
 					// Filter out which Transactions we have that were not in this block
 					var newtxs []*ethchain.Transaction
@@ -92,7 +100,7 @@ out:
 
 				} else {
 					if bytes.Compare(block.PrevHash, miner.ethereum.BlockChain().CurrentBlock.PrevHash) == 0 {
-						ethutil.Config.Log.Infoln("[MINER] Adding uncle block")
+						logger.Infoln("Adding uncle block")
 						miner.uncles = append(miner.uncles, block)
 					}
 				}
@@ -120,8 +128,9 @@ out:
 }
 
 func (self *Miner) Stop() {
-	self.powQuitChan <- ethutil.React{}
+	logger.Infoln("Stopping...")
 	self.quitChan <- true
+	self.powQuitChan <- ethutil.React{}
 }
 
 func (self *Miner) mineNewBlock() {
@@ -137,14 +146,14 @@ func (self *Miner) mineNewBlock() {
 	// Sort the transactions by nonce in case of odd network propagation
 	sort.Sort(ethchain.TxByNonce{self.txs})
 
-	// Accumulate all valid transaction and apply them to the new state
+	// Accumulate all valid transactions and apply them to the new state
 	// Error may be ignored. It's not important during mining
 	parent := self.ethereum.BlockChain().GetBlock(self.block.PrevHash)
 	coinbase := self.block.State().GetOrNewStateObject(self.block.Coinbase)
 	coinbase.SetGasPool(self.block.CalcGasLimit(parent))
 	receipts, txs, unhandledTxs, err := stateManager.ProcessTransactions(coinbase, self.block.State(), self.block, self.block, self.txs)
 	if err != nil {
-		ethutil.Config.Log.Debugln("[MINER]", err)
+		logger.Debugln(err)
 	}
 	self.txs = append(txs, unhandledTxs...)
 
@@ -156,18 +165,18 @@ func (self *Miner) mineNewBlock() {
 
 	self.block.State().Update()
 
-	ethutil.Config.Log.Infoln("[MINER] Mining on block. Includes", len(self.txs), "transactions")
+	logger.Infof("Mining on block. Includes %v transactions", len(self.txs))
 
 	// Find a valid nonce
 	self.block.Nonce = self.pow.Search(self.block, self.powQuitChan)
 	if self.block.Nonce != nil {
 		err := self.ethereum.StateManager().Process(self.block, false)
 		if err != nil {
-			ethutil.Config.Log.Infoln(err)
+			logger.Infoln(err)
 		} else {
 			self.ethereum.Broadcast(ethwire.MsgBlockTy, []interface{}{self.block.Value().Val})
-			ethutil.Config.Log.Infof("[MINER] 🔨  Mined block %x\n", self.block.Hash())
-			ethutil.Config.Log.Infoln(self.block)
+			logger.Infof("🔨  Mined block %x\n", self.block.Hash())
+			logger.Infoln(self.block)
 			// Gather the new batch of transactions currently in the tx pool
 			self.txs = self.ethereum.TxPool().CurrentTransactions()
 		}
diff --git a/ethpub/pub.go b/ethpub/pub.go
index 05acdb058..1bc9e0ce7 100644
--- a/ethpub/pub.go
+++ b/ethpub/pub.go
@@ -5,12 +5,15 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"github.com/ethereum/eth-go/ethchain"
+	"github.com/ethereum/eth-go/ethlog"
 	"github.com/ethereum/eth-go/ethutil"
 	"math/big"
 	"strings"
 	"sync/atomic"
 )
 
+var logger = ethlog.NewLogger("PUB")
+
 type PEthereum struct {
 	manager      ethchain.EthManager
 	stateManager *ethchain.StateManager
@@ -222,7 +225,7 @@ func (lib *PEthereum) createTx(key, recipient, valueStr, gasStr, gasPriceStr, sc
 	lib.txPool.QueueTransaction(tx)
 
 	if contractCreation {
-		ethutil.Config.Log.Infof("Contract addr %x", tx.CreationAddress())
+		logger.Infof("Contract addr %x", tx.CreationAddress())
 	}
 
 	return NewPReciept(contractCreation, tx.CreationAddress(), tx.Hash(), keyPair.Address()), nil
diff --git a/ethrpc/packages.go b/ethrpc/packages.go
index 3f57f6982..710275780 100644
--- a/ethrpc/packages.go
+++ b/ethrpc/packages.go
@@ -184,7 +184,7 @@ func (p *EthereumApi) GetStorageAt(args *GetStorageArgs, reply *string) error {
 		i, _ := new(big.Int).SetString(args.Key, 10)
 		hx = ethutil.Hex(i.Bytes())
 	}
-	ethutil.Config.Log.Debugf("[JSON] GetStorageAt(%s, %s)\n", args.Address, hx)
+	logger.Debugf("GetStorageAt(%s, %s)\n", args.Address, hx)
 	value := state.GetStorage(hx)
 	*reply = NewSuccessRes(GetStorageAtRes{Address: args.Address, Key: args.Key, Value: value})
 	return nil
diff --git a/ethrpc/server.go b/ethrpc/server.go
index 3960e641c..d9d6f695b 100644
--- a/ethrpc/server.go
+++ b/ethrpc/server.go
@@ -2,13 +2,15 @@ package ethrpc
 
 import (
 	"fmt"
+	"github.com/ethereum/eth-go/ethlog"
 	"github.com/ethereum/eth-go/ethpub"
-	"github.com/ethereum/eth-go/ethutil"
 	"net"
 	"net/rpc"
 	"net/rpc/jsonrpc"
 )
 
+var logger = ethlog.NewLogger("JSON")
+
 type JsonRpcServer struct {
 	quit     chan bool
 	listener net.Listener
@@ -25,7 +27,7 @@ out:
 		}
 	}
 
-	ethutil.Config.Log.Infoln("[JSON] Shutdown JSON-RPC server")
+	logger.Infoln("Shutdown JSON-RPC server")
 }
 
 func (s *JsonRpcServer) Stop() {
@@ -33,7 +35,7 @@ func (s *JsonRpcServer) Stop() {
 }
 
 func (s *JsonRpcServer) Start() {
-	ethutil.Config.Log.Infoln("[JSON] Starting JSON-RPC server")
+	logger.Infoln("Starting JSON-RPC server")
 	go s.exitHandler()
 	rpc.Register(&EthereumApi{ethp: s.ethp})
 	rpc.HandleHTTP()
@@ -41,10 +43,10 @@ func (s *JsonRpcServer) Start() {
 	for {
 		conn, err := s.listener.Accept()
 		if err != nil {
-			ethutil.Config.Log.Infoln("[JSON] Error starting JSON-RPC:", err)
+			logger.Infoln("Error starting JSON-RPC:", err)
 			break
 		}
-		ethutil.Config.Log.Debugln("[JSON] Incoming request.")
+		logger.Debugln("Incoming request.")
 		go jsonrpc.ServeConn(conn)
 	}
 }
diff --git a/ethutil/config.go b/ethutil/config.go
index a573e108b..aa4ae9c3e 100644
--- a/ethutil/config.go
+++ b/ethutil/config.go
@@ -4,10 +4,7 @@ import (
 	"flag"
 	"fmt"
 	"github.com/rakyll/globalconf"
-	"log"
 	"os"
-	"os/user"
-	"path"
 	"runtime"
 )
 
@@ -15,7 +12,6 @@ import (
 type config struct {
 	Db Database
 
-	Log          *Logger
 	ExecPath     string
 	Debug        bool
 	Ver          string
@@ -26,62 +22,31 @@ type config struct {
 	conf *globalconf.GlobalConf
 }
 
-const defaultConf = `
-id = ""
-port = 30303
-upnp = true
-maxpeer = 10
-rpc = false
-rpcport = 8080
-`
-
 var Config *config
 
-func ApplicationFolder(base string) string {
-	usr, _ := user.Current()
-	p := path.Join(usr.HomeDir, base)
-
-	if len(base) > 0 {
-		//Check if the logging directory already exists, create it if not
-		_, err := os.Stat(p)
-		if err != nil {
-			if os.IsNotExist(err) {
-				log.Printf("Debug logging directory %s doesn't exist, creating it\n", p)
-				os.Mkdir(p, 0777)
-
-			}
-		}
-
-		iniFilePath := path.Join(p, "conf.ini")
-		_, err = os.Stat(iniFilePath)
-		if err != nil && os.IsNotExist(err) {
-			file, err := os.Create(iniFilePath)
-			if err != nil {
-				fmt.Println(err)
-			} else {
-				assetPath := path.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "ethereal", "assets")
-				file.Write([]byte(defaultConf + "\nasset_path = " + assetPath))
-			}
-		}
-	}
-
-	return p
-}
-
 // Read config
 //
-// Initialize the global Config variable with default settings
-func ReadConfig(base string, logTypes LoggerType, g *globalconf.GlobalConf, id string) *config {
+// Initialize Config from Config File
+func ReadConfig(ConfigFile string, Datadir string, Identifier string, EnvPrefix string) *config {
 	if Config == nil {
-		path := ApplicationFolder(base)
-
-		Config = &config{ExecPath: path, Debug: true, Ver: "0.5.14"}
-		Config.conf = g
-		Config.Identifier = id
-		Config.Log = NewLogger(logTypes, LogLevelDebug)
+		// create ConfigFile if does not exist, otherwise globalconf panic when trying to persist flags
+		_, err := os.Stat(ConfigFile)
+		if err != nil && os.IsNotExist(err) {
+			fmt.Printf("config file '%s' doesn't exist, creating it\n", ConfigFile)
+			os.Create(ConfigFile)
+		}
+		g, err := globalconf.NewWithOptions(&globalconf.Options{
+			Filename:  ConfigFile,
+			EnvPrefix: EnvPrefix,
+		})
+		if err != nil {
+			fmt.Println(err)
+		} else {
+			g.ParseAll()
+		}
+		Config = &config{ExecPath: Datadir, Debug: true, Ver: "0.5.14", conf: g, Identifier: Identifier}
 		Config.SetClientString("Ethereum(G)")
 	}
-
 	return Config
 }
 
@@ -98,137 +63,12 @@ func (c *config) SetIdentifier(id string) {
 	c.Set("id", id)
 }
 
+// provides persistence for flags
 func (c *config) Set(key, value string) {
 	f := &flag.Flag{Name: key, Value: &confValue{value}}
 	c.conf.Set("", f)
 }
 
-type LoggerType byte
-
-const (
-	LogFile = 0x1
-	LogStd  = 0x2
-)
-
-type LogSystem interface {
-	Println(v ...interface{})
-	Printf(format string, v ...interface{})
-}
-
-type Logger struct {
-	logSys   []LogSystem
-	logLevel int
-}
-
-func NewLogger(flag LoggerType, level int) *Logger {
-	var loggers []LogSystem
-
-	flags := log.LstdFlags
-
-	if flag&LogFile > 0 {
-		file, err := os.OpenFile(path.Join(Config.ExecPath, "debug.log"), os.O_RDWR|os.O_CREATE|os.O_APPEND, os.ModePerm)
-		if err != nil {
-			log.Panic("unable to create file logger", err)
-		}
-
-		log := log.New(file, "", flags)
-
-		loggers = append(loggers, log)
-	}
-	if flag&LogStd > 0 {
-		log := log.New(os.Stdout, "", flags)
-		loggers = append(loggers, log)
-	}
-
-	return &Logger{logSys: loggers, logLevel: level}
-}
-
-func (self *Logger) SetLevel(level int) {
-	self.logLevel = level
-}
-
-func (log *Logger) AddLogSystem(logger LogSystem) {
-	log.logSys = append(log.logSys, logger)
-}
-
-const (
-	LogLevelSystem = iota
-	LogLevelDebug
-	LogLevelInfo
-)
-
-func (log *Logger) Debugln(v ...interface{}) {
-	if log.logLevel != LogLevelDebug {
-		return
-	}
-
-	for _, logger := range log.logSys {
-		logger.Println(v...)
-	}
-}
-
-func (log *Logger) Debugf(format string, v ...interface{}) {
-	if log.logLevel != LogLevelDebug {
-		return
-	}
-
-	for _, logger := range log.logSys {
-		logger.Printf(format, v...)
-	}
-}
-
-func (log *Logger) Infoln(v ...interface{}) {
-	if log.logLevel > LogLevelInfo {
-		return
-	}
-
-	for _, logger := range log.logSys {
-		logger.Println(v...)
-	}
-}
-
-func (log *Logger) Infof(format string, v ...interface{}) {
-	if log.logLevel > LogLevelInfo {
-		return
-	}
-
-	for _, logger := range log.logSys {
-		logger.Printf(format, v...)
-	}
-}
-
-func (log *Logger) Fatal(v ...interface{}) {
-	if log.logLevel > LogLevelInfo {
-		return
-	}
-
-	for _, logger := range log.logSys {
-		logger.Println(v...)
-	}
-
-	os.Exit(1)
-}
-
-func (log *Logger) Println(level int, v ...interface{}) {
-	if log.logLevel > level {
-		return
-	}
-
-	for _, logger := range log.logSys {
-		logger.Println(v...)
-	}
-}
-
-func (log *Logger) Printf(level int, format string, v ...interface{}) {
-	if log.logLevel > level {
-		return
-	}
-
-	for _, logger := range log.logSys {
-		logger.Printf(format, v...)
-	}
-}
-
 type confValue struct {
 	value string
 }
diff --git a/ethutil/encoding_test.go b/ethutil/encoding_test.go
index cbfbc0eaf..10e1995c0 100644
--- a/ethutil/encoding_test.go
+++ b/ethutil/encoding_test.go
@@ -64,4 +64,4 @@ func TestCompactDecode(t *testing.T) {
 	if !CompareIntSlice(res, exp) {
 		t.Error("even terminated compact decode. Expected", exp, "got", res)
 	}
-}
\ No newline at end of file
+}
diff --git a/peer.go b/peer.go
index ca4168940..e50fd43f9 100644
--- a/peer.go
+++ b/peer.go
@@ -5,6 +5,7 @@ import (
 	"container/list"
 	"fmt"
 	"github.com/ethereum/eth-go/ethchain"
+	"github.com/ethereum/eth-go/ethlog"
 	"github.com/ethereum/eth-go/ethutil"
 	"github.com/ethereum/eth-go/ethwire"
 	"net"
@@ -14,6 +15,8 @@ import (
 	"time"
 )
 
+var peerlogger = ethlog.NewLogger("PEER")
+
 const (
 	// The size of the output buffer for writing messages
 	outputBufferSize = 50
@@ -178,7 +181,7 @@ func NewOutboundPeer(addr string, ethereum *Ethereum, caps Caps) *Peer {
 		conn, err := net.DialTimeout("tcp", addr, 10*time.Second)
 
 		if err != nil {
-			ethutil.Config.Log.Debugln("Connection to peer failed", err)
+			peerlogger.Debugln("Connection to peer failed", err)
 			p.Stop()
 			return
 		}
@@ -247,11 +250,11 @@ func (p *Peer) writeMessage(msg *ethwire.Msg) {
 		}
 	}
 
-	ethutil.Config.Log.Println(ethutil.LogLevelSystem, "<=", msg.Type, msg.Data)
+	peerlogger.DebugDetailln("<=", msg.Type, msg.Data)
 
 	err := ethwire.WriteMessage(p.conn, msg)
 	if err != nil {
-		ethutil.Config.Log.Debugln("[PEER] Can't send message:", err)
+		peerlogger.Debugln(" Can't send message:", err)
 		// Stop the client if there was an error writing to it
 		p.Stop()
 		return
@@ -276,7 +279,7 @@ out:
 		case <-pingTimer.C:
 			timeSince := time.Since(time.Unix(p.lastPong, 0))
 			if !p.pingStartTime.IsZero() && p.lastPong != 0 && timeSince > (pingPongTimer+30*time.Second) {
-				ethutil.Config.Log.Infof("[PEER] Peer did not respond to latest pong fast enough, it took %s, disconnecting.\n", timeSince)
+				peerlogger.Infof("Peer did not respond to latest pong fast enough, it took %s, disconnecting.\n", timeSince)
 				p.Stop()
 				return
 			}
@@ -318,10 +321,10 @@ func (p *Peer) HandleInbound() {
 		// Wait for a message from the peer
 		msgs, err := ethwire.ReadMessages(p.conn)
 		if err != nil {
-			ethutil.Config.Log.Debugln(err)
+			peerlogger.Debugln(err)
 		}
 		for _, msg := range msgs {
-			ethutil.Config.Log.Println(ethutil.LogLevelSystem, "=>", msg.Type, msg.Data)
+			peerlogger.DebugDetailln("=>", msg.Type, msg.Data)
 
 			switch msg.Type {
 			case ethwire.MsgHandshakeTy:
@@ -333,7 +336,7 @@ func (p *Peer) HandleInbound() {
 				}
 			case ethwire.MsgDiscTy:
 				p.Stop()
-				ethutil.Config.Log.Infoln("Disconnect peer:", DiscReason(msg.Data.Get(0).Uint()))
+				peerlogger.Infoln("Disconnect peer:", DiscReason(msg.Data.Get(0).Uint()))
 			case ethwire.MsgPingTy:
 				// Respond back with pong
 				p.QueueMessage(ethwire.NewMessage(ethwire.MsgPongTy, ""))
@@ -358,8 +361,7 @@ func (p *Peer) HandleInbound() {
 						continue
 					}
 					p.lastRequestedBlock = lastBlock
-
-					ethutil.Config.Log.Infof("[PEER] Last block: %x. Checking if we have it locally.\n", lastBlock.Hash())
+					peerlogger.Infof("Last block: %x. Checking if we have it locally.\n", lastBlock.Hash())
 					for i := msg.Data.Len() - 1; i >= 0; i-- {
 						block = ethchain.NewBlockFromRlpValue(msg.Data.Get(i))
 						// Do we have this block on our chain? If so we can continue
@@ -380,7 +382,7 @@ func (p *Peer) HandleInbound() {
 						// we just keep increasing the amount of blocks.
 						p.blocksRequested = p.blocksRequested * 2
 
-						ethutil.Config.Log.Infof("[PEER] No common ancestor found, requesting %d more blocks.\n", p.blocksRequested)
+						peerlogger.Infof("No common ancestor found, requesting %d more blocks.\n", p.blocksRequested)
 						p.catchingUp = false
 						p.FindCommonParentBlock()
 						break
@@ -396,9 +398,9 @@ func (p *Peer) HandleInbound() {
 
 					if err != nil {
 						if ethutil.Config.Debug {
-							ethutil.Config.Log.Infof("[PEER] Block %x failed\n", block.Hash())
-							ethutil.Config.Log.Infof("[PEER] %v\n", err)
-							ethutil.Config.Log.Debugln(block)
+							peerlogger.Infof("Block %x failed\n", block.Hash())
+							peerlogger.Infof("%v\n", err)
+							peerlogger.Debugln(block)
 						}
 						break
 					} else {
@@ -415,7 +417,7 @@ func (p *Peer) HandleInbound() {
 				if err != nil {
 					// If the parent is unknown try to catch up with this peer
 					if ethchain.IsParentErr(err) {
-						ethutil.Config.Log.Infoln("Attempting to catch. Parent known")
+						peerlogger.Infoln("Attempting to catch. Parent known")
 						p.catchingUp = false
 						p.CatchupWithPeer(p.ethereum.BlockChain().CurrentBlock.Hash())
 					} else if ethchain.IsValidationErr(err) {
@@ -427,7 +429,7 @@ func (p *Peer) HandleInbound() {
 					if p.catchingUp && msg.Data.Len() > 1 {
 						if lastBlock != nil {
 							blockInfo := lastBlock.BlockInfo()
-							ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "Synced chain to #%d %x %x\n", blockInfo.Number, lastBlock.Hash(), blockInfo.Hash)
+							peerlogger.DebugDetailf("Synced chain to #%d %x %x\n", blockInfo.Number, lastBlock.Hash(), blockInfo.Hash)
 						}
 
 						p.catchingUp = false
@@ -494,17 +496,17 @@ func (p *Peer) HandleInbound() {
 
 				// If a parent is found send back a reply
 				if parent != nil {
-					ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "[PEER] Found canonical block, returning chain from: %x ", parent.Hash())
+					peerlogger.DebugDetailf("Found canonical block, returning chain from: %x ", parent.Hash())
 					chain := p.ethereum.BlockChain().GetChainFromHash(parent.Hash(), amountOfBlocks)
 					if len(chain) > 0 {
-						//ethutil.Config.Log.Debugf("[PEER] Returning %d blocks: %x ", len(chain), parent.Hash())
+						//peerlogger.Debugf("Returning %d blocks: %x ", len(chain), parent.Hash())
 						p.QueueMessage(ethwire.NewMessage(ethwire.MsgBlockTy, chain))
 					} else {
 						p.QueueMessage(ethwire.NewMessage(ethwire.MsgBlockTy, []interface{}{}))
 					}
 
 				} else {
-					//ethutil.Config.Log.Debugf("[PEER] Could not find a similar block")
+					//peerlogger.Debugf("Could not find a similar block")
 					// If no blocks are found we send back a reply with msg not in chain
 					// and the last hash from get chain
 					if l > 0 {
@@ -514,7 +516,7 @@ func (p *Peer) HandleInbound() {
 					}
 				}
 			case ethwire.MsgNotInChainTy:
-				ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "Not in chain: %x\n", msg.Data.Get(0).Bytes())
+				peerlogger.DebugDetailf("Not in chain: %x\n", msg.Data.Get(0).Bytes())
 				if p.diverted == true {
 					// If were already looking for a common parent and we get here again we need to go deeper
 					p.blocksRequested = p.blocksRequested * 2
@@ -535,7 +537,7 @@ func (p *Peer) HandleInbound() {
 
 				// Unofficial but fun nonetheless
 			case ethwire.MsgTalkTy:
-				ethutil.Config.Log.Infoln("%v says: %s\n", p.conn.RemoteAddr(), msg.Data.Str())
+				peerlogger.Infoln("%v says: %s\n", p.conn.RemoteAddr(), msg.Data.Str())
 			}
 		}
 	}
@@ -554,7 +556,7 @@ func (p *Peer) Start() {
 
 	err := p.pushHandshake()
 	if err != nil {
-		ethutil.Config.Log.Debugln("Peer can't send outbound version ack", err)
+		peerlogger.Debugln("Peer can't send outbound version ack", err)
 
 		p.Stop()
 
@@ -628,7 +630,7 @@ func (p *Peer) handleHandshake(msg *ethwire.Msg) {
 	p.pubkey = c.Get(5).Bytes()
 
 	if p.pubkey == nil {
-		//ethutil.Config.Log.Debugln("Pubkey required, not supplied in handshake.")
+		peerlogger.Warnln("Pubkey required, not supplied in handshake.")
 		p.Stop()
 		return
 	}
@@ -643,13 +645,13 @@ func (p *Peer) handleHandshake(msg *ethwire.Msg) {
 	})
 
 	if usedPub > 0 {
-		//ethutil.Config.Log.Debugf("Pubkey %x found more then once. Already connected to client.", p.pubkey)
+		peerlogger.Debugf("Pubkey %x found more then once. Already connected to client.", p.pubkey)
 		p.Stop()
 		return
 	}
 
 	if c.Get(0).Uint() != ProtocolVersion {
-		ethutil.Config.Log.Debugf("Invalid peer version. Require protocol: %d. Received: %d\n", ProtocolVersion, c.Get(0).Uint())
+		peerlogger.Debugf("Invalid peer version. Require protocol: %d. Received: %d\n", ProtocolVersion, c.Get(0).Uint())
 		p.Stop()
 		return
 	}
@@ -683,16 +685,16 @@ func (p *Peer) handleHandshake(msg *ethwire.Msg) {
 	p.ethereum.PushPeer(p)
 	p.ethereum.reactor.Post("peerList", p.ethereum.Peers())
 
-	ethutil.Config.Log.Infof("[SERV] Added peer (%s) %d / %d\n", p.conn.RemoteAddr(), p.ethereum.Peers().Len(), p.ethereum.MaxPeers)
+	ethlogger.Infof("Added peer (%s) %d / %d\n", p.conn.RemoteAddr(), p.ethereum.Peers().Len(), p.ethereum.MaxPeers)
 
 	// Catch up with the connected peer
 	if !p.ethereum.IsUpToDate() {
-		ethutil.Config.Log.Debugln("Already syncing up with a peer; sleeping")
+		peerlogger.Debugln("Already syncing up with a peer; sleeping")
 		time.Sleep(10 * time.Second)
 	}
 	p.SyncWithPeerToLastKnown()
 
-	ethutil.Config.Log.Debugln("[PEER]", p)
+	peerlogger.Debugln(p)
 }
 
 func (p *Peer) String() string {
@@ -735,7 +737,7 @@ func (p *Peer) FindCommonParentBlock() {
 
 	msgInfo := append(hashes, uint64(len(hashes)))
 
-	ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "Asking for block from %x (%d total) from %s\n", p.ethereum.BlockChain().CurrentBlock.Hash(), len(hashes), p.conn.RemoteAddr().String())
+	peerlogger.DebugDetailf("Asking for block from %x (%d total) from %s\n", p.ethereum.BlockChain().CurrentBlock.Hash(), len(hashes), p.conn.RemoteAddr().String())
 
 	msg := ethwire.NewMessage(ethwire.MsgGetChainTy, msgInfo)
 	p.QueueMessage(msg)
@@ -747,7 +749,7 @@ func (p *Peer) CatchupWithPeer(blockHash []byte) {
 		msg := ethwire.NewMessage(ethwire.MsgGetChainTy, []interface{}{blockHash, uint64(50)})
 		p.QueueMessage(msg)
 
-		ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "Requesting blockchain %x... from peer %s\n", p.ethereum.BlockChain().CurrentBlock.Hash()[:4], p.conn.RemoteAddr())
+		peerlogger.DebugDetailf("Requesting blockchain %x... from peer %s\n", p.ethereum.BlockChain().CurrentBlock.Hash()[:4], p.conn.RemoteAddr())
 
 		msg = ethwire.NewMessage(ethwire.MsgGetTxsTy, []interface{}{})
 		p.QueueMessage(msg)