7 files changed, 29 insertions, 18 deletions
diff --git a/core/block_processor.go b/core/block_processor.go
index 059c442cc..5199e4b4d 100644
--- a/core/block_processor.go
+++ b/core/block_processor.go
@@ -347,17 +347,17 @@ func (sm *BlockProcessor) VerifyUncles(statedb *state.StateDB, block, parent *ty
 	for i, uncle := range block.Uncles() {
 		if uncles.Has(uncle.Hash()) {
 			// Error not unique
-			return UncleError("Uncle not unique")
+			return UncleError("uncle[%d] not unique", i)
 		}
 
 		uncles.Add(uncle.Hash())
 
 		if ancestors.Has(uncle.Hash()) {
-			return UncleError("Uncle is ancestor")
+			return UncleError("uncle[%d] is ancestor", i)
 		}
 
 		if !ancestors.Has(uncle.ParentHash) {
-			return UncleError(fmt.Sprintf("Uncle's parent unknown (%x)", uncle.ParentHash[0:4]))
+			return UncleError("uncle[%d]'s parent unknown (%x)", i, uncle.ParentHash[0:4])
 		}
 
 		if err := sm.ValidateHeader(uncle, ancestorHeaders[uncle.ParentHash]); err != nil {
diff --git a/core/chain_makers.go b/core/chain_makers.go
index 5cd7ab4ab..acf7b39cc 100644
--- a/core/chain_makers.go
+++ b/core/chain_makers.go
@@ -98,7 +98,7 @@ func makeChain(bman *BlockProcessor, parent *types.Block, max int, db common.Dat
 			fmt.Println("process with parent failed", err)
 			panic(err)
 		}
-		block.Td = CalculateTD(block, parent)
+		block.Td = CalcTD(block, parent)
 		blocks[i] = block
 		parent = block
 	}
diff --git a/core/chain_manager.go b/core/chain_manager.go
index 9f6d7f823..a0839ad41 100644
--- a/core/chain_manager.go
+++ b/core/chain_manager.go
@@ -48,7 +48,7 @@ func CalcDifficulty(block, parent *types.Header) *big.Int {
 	return diff
 }
 
-func CalculateTD(block, parent *types.Block) *big.Int {
+func CalcTD(block, parent *types.Block) *big.Int {
 	if parent == nil {
 		return block.Difficulty()
 	}
@@ -59,14 +59,20 @@ func CalculateTD(block, parent *types.Block) *big.Int {
 }
 
 func CalcGasLimit(parent *types.Block) *big.Int {
-	// ((1024-1) * parent.gasLimit + (gasUsed * 6 / 5)) / 1024
-	previous := new(big.Int).Mul(big.NewInt(1024-1), parent.GasLimit())
-	current := new(big.Rat).Mul(new(big.Rat).SetInt(parent.GasUsed()), big.NewRat(6, 5))
-	curInt := new(big.Int).Div(current.Num(), current.Denom())
+	decay := new(big.Int).Div(parent.GasLimit(), params.GasLimitBoundDivisor)
+	contrib := new(big.Int).Mul(parent.GasUsed(), big.NewInt(3))
+	contrib = contrib.Div(contrib, big.NewInt(2))
+	contrib = contrib.Div(contrib, params.GasLimitBoundDivisor)
 
-	result := new(big.Int).Add(previous, curInt)
-	result.Div(result, big.NewInt(1024))
-	return common.BigMax(params.GenesisGasLimit, result)
+	gl := new(big.Int).Sub(parent.GasLimit(), decay)
+	gl = gl.Add(gl, contrib)
+	gl = common.BigMax(gl, params.MinGasLimit)
+
+	if gl.Cmp(params.GenesisGasLimit) < 0 {
+		gl2 := new(big.Int).Add(parent.GasLimit(), decay)
+		return common.BigMin(params.GenesisGasLimit, gl2)
+	}
+	return gl
 }
 
 type ChainManager struct {
@@ -525,7 +531,7 @@ func (self *ChainManager) InsertChain(chain types.Blocks) (int, error) {
 		}
 		// Setting block.Td regardless of error (known for example) prevents errors down the line
 		// in the protocol handler
-		block.Td = new(big.Int).Set(CalculateTD(block, self.GetBlock(block.ParentHash())))
+		block.Td = new(big.Int).Set(CalcTD(block, self.GetBlock(block.ParentHash())))
 
 		// Call in to the block processor and check for errors. It's likely that if one block fails
 		// all others will fail too (unless a known block is returned).
@@ -593,7 +599,7 @@ func (self *ChainManager) InsertChain(chain types.Blocks) (int, error) {
 				self.setTransState(state.New(block.Root(), self.stateDb))
 				self.txState.SetState(state.New(block.Root(), self.stateDb))
 
-				queue[i] = ChainEvent{block, logs}
+				queue[i] = ChainEvent{block, block.Hash(), logs}
 				queueEvent.canonicalCount++
 
 				if glog.V(logger.Debug) {
@@ -683,7 +689,7 @@ out:
 					case ChainEvent:
 						// We need some control over the mining operation. Acquiring locks and waiting for the miner to create new block takes too long
 						// and in most cases isn't even necessary.
-						if i+1 == ev.canonicalCount {
+						if self.lastBlockHash == event.Hash {
 							self.currentGasLimit = CalcGasLimit(event.Block)
 							self.eventMux.Post(ChainHeadEvent{event.Block})
 						}
diff --git a/core/chain_manager_test.go b/core/chain_manager_test.go
index f456e4fff..b5155e223 100644
--- a/core/chain_manager_test.go
+++ b/core/chain_manager_test.go
@@ -81,7 +81,7 @@ func testChain(chainB types.Blocks, bman *BlockProcessor) (*big.Int, error) {
 			return nil, err
 		}
 		parent := bman.bc.GetBlock(block.ParentHash())
-		block.Td = CalculateTD(block, parent)
+		block.Td = CalcTD(block, parent)
 		td = block.Td
 
 		bman.bc.mu.Lock()
diff --git a/core/error.go b/core/error.go
index 40db99ecd..2bdad364f 100644
--- a/core/error.go
+++ b/core/error.go
@@ -42,8 +42,8 @@ func (err *UncleErr) Error() string {
 	return err.Message
 }
 
-func UncleError(str string) error {
-	return &UncleErr{Message: str}
+func UncleError(format string, v ...interface{}) error {
+	return &UncleErr{Message: fmt.Sprintf(format, v...)}
 }
 
 func IsUncleErr(err error) bool {
diff --git a/core/events.go b/core/events.go
index 1ea35c2f4..7b56f8bb6 100644
--- a/core/events.go
+++ b/core/events.go
@@ -3,6 +3,7 @@ package core
 import (
 	"math/big"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
 )
@@ -27,6 +28,7 @@ type ChainSplitEvent struct {
 
 type ChainEvent struct {
 	Block *types.Block
+	Hash  common.Hash
 	Logs  state.Logs
 }
 
diff --git a/core/manager.go b/core/manager.go
index 433ada7ee..695f0e99c 100644
--- a/core/manager.go
+++ b/core/manager.go
@@ -3,10 +3,12 @@ package core
 import (
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/p2p"
 )
 
+// TODO move this to types?
 type Backend interface {
 	AccountManager() *accounts.Manager
 	BlockProcessor() *BlockProcessor
@@ -18,4 +20,5 @@ type Backend interface {
 	BlockDb() common.Database
 	StateDb() common.Database
 	EventMux() *event.TypeMux
+	Downloader() *downloader.Downloader
 }