Added a callback mechanism to chain adding.

Not sure if this is the right approach. Why? BlockChain shouldn't need
the "Ethereum" object. BlockChain shouldn't need to worry about
notifying listeners or message propagation.

block_pool.go

@@ -13,6 +13,7 @@ import (
 	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/wire"
 )
 
@@ -310,10 +311,6 @@ out:
 				}
 			}
 
-			// TODO figure out whether we were catching up
-			// If caught up and just a new block has been propagated:
-			// sm.eth.EventMux().Post(NewBlockEvent{block})
-			// otherwise process and don't emit anything
 			if len(blocks) > 0 {
 				chainManager := self.eth.ChainManager()
 				// Test and import
@@ -335,10 +332,13 @@ out:
 					self.peer = nil
 				} else {
 					if !chain.IsTDError(err) {
-						chainManager.InsertChain(bchain)
-						for _, block := range blocks {
+						chainManager.InsertChain(bchain, func(block *types.Block, messages state.Messages) {
+							self.eth.EventMux().Post(chain.NewBlockEvent{block})
+							self.eth.EventMux().Post(messages)
+
 							self.Remove(block.Hash())
-						}
+						})
+
 					}
 				}
 			}