From aedd4b46cdc0a48c1b06a3e920bf57f8c28d401d Mon Sep 17 00:00:00 2001
From: Determinant <tederminant@gmail.com>
Date: Thu, 17 Sep 2020 03:08:39 -0400
Subject: fix the block completion race

---
 coreth.go        |  5 +++++
 miner/miner.go   |  4 ++++
 plugin/evm/vm.go | 21 ++++++++++++---------
 3 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/coreth.go b/coreth.go
index 4d0c2ee..1d6b92e 100644
--- a/coreth.go
+++ b/coreth.go
@@ -17,6 +17,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/trie"
 	//"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/log"
@@ -85,6 +86,10 @@ func (self *ETHChain) GenBlock() {
 	self.backend.Miner().GenBlock()
 }
 
+func (self *ETHChain) SubscribeNewMinedBlockEvent() *event.TypeMuxSubscription {
+	return self.backend.Miner().GetWorkerMux().Subscribe(core.NewMinedBlockEvent{})
+}
+
 func (self *ETHChain) VerifyBlock(block *types.Block) bool {
 	txnHash := types.DeriveSha(block.Transactions(), new(trie.Trie))
 	uncleHash := types.CalcUncleHash(block.Uncles())
diff --git a/miner/miner.go b/miner/miner.go
index e8e59a4..bbe704f 100644
--- a/miner/miner.go
+++ b/miner/miner.go
@@ -135,3 +135,7 @@ func (miner *Miner) SubscribePendingLogs(ch chan<- []*types.Log) event.Subscript
 func (miner *Miner) GenBlock() {
 	miner.worker.genBlock()
 }
+
+func (miner *Miner) GetWorkerMux() *event.TypeMux {
+	return miner.worker.mux
+}
diff --git a/plugin/evm/vm.go b/plugin/evm/vm.go
index c6bc728..c9836c6 100644
--- a/plugin/evm/vm.go
+++ b/plugin/evm/vm.go
@@ -160,7 +160,7 @@ type VM struct {
 	chaindb           Database
 	newBlockChan      chan *Block
 	networkChan       chan<- commonEng.Message
-	newTxPoolHeadChan chan core.NewTxPoolHeadEvent
+	newTxPoolHeadChan *event.TypeMuxSubscription
 
 	acceptedDB database.Database
 
@@ -344,23 +344,26 @@ func (vm *VM) Initialize(
 
 	vm.bdTimerState = bdTimerStateLong
 	vm.bdGenWaitFlag = true
-	vm.newTxPoolHeadChan = make(chan core.NewTxPoolHeadEvent, 1)
+	//vm.newTxPoolHeadChan = make(chan core.NewTxPoolHeadEvent, 1)
 	vm.txPoolStabilizedOk = make(chan struct{}, 1)
 	// TODO: read size from options
 	vm.pendingAtomicTxs = make(chan *Tx, 1024)
 	vm.atomicTxSubmitChan = make(chan struct{}, 1)
-	chain.GetTxPool().SubscribeNewHeadEvent(vm.newTxPoolHeadChan)
+	//chain.GetTxPool().SubscribeNewHeadEvent(vm.newTxPoolHeadChan)
+	vm.newTxPoolHeadChan = vm.chain.SubscribeNewMinedBlockEvent()
 	// TODO: shutdown this go routine
 	go ctx.Log.RecoverAndPanic(func() {
 		for {
 			select {
-			case h := <-vm.newTxPoolHeadChan:
-				vm.txPoolStabilizedLock.Lock()
-				if vm.txPoolStabilizedHead == h.Block.Hash() {
-					vm.txPoolStabilizedOk <- struct{}{}
-					vm.txPoolStabilizedHead = common.Hash{}
+			case e := <-vm.newTxPoolHeadChan.Chan():
+				switch h := e.Data.(core.NewTxPoolHeadEvent) {
+					vm.txPoolStabilizedLock.Lock()
+					if vm.txPoolStabilizedHead == h.Block.Hash() {
+						vm.txPoolStabilizedOk <- struct{}{}
+						vm.txPoolStabilizedHead = common.Hash{}
+					}
+					vm.txPoolStabilizedLock.Unlock()
 				}
-				vm.txPoolStabilizedLock.Unlock()
 			}
 		}
 	})
-- 
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