eth, eth/downloader, miner: use download events to check miner start

1 files changed, 55 insertions, 13 deletions

diff --git a/miner/miner.go b/miner/miner.go
index 8143fcef7..359be4032 100644
--- a/miner/miner.go
+++ b/miner/miner.go
@@ -2,33 +2,63 @@ package miner
 
 import (
 	"math/big"
+	"sync/atomic"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/eth/downloader"
+	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
 	"github.com/ethereum/go-ethereum/pow"
 )
 
 type Miner struct {
+	mux *event.TypeMux
+
 	worker *worker
 
 	MinAcceptedGasPrice *big.Int
 
-	threads int
-	mining  bool
-	eth     core.Backend
-	pow     pow.PoW
+	threads  int
+	coinbase common.Address
+	mining   int32
+	eth      core.Backend
+	pow      pow.PoW
+
+	canStart    int32 // can start indicates whether we can start the mining operation
+	shouldStart int32 // should start indicates whether we should start after sync
 }
 
-func New(eth core.Backend, pow pow.PoW) *Miner {
-	return &Miner{eth: eth, pow: pow, worker: newWorker(common.Address{}, eth)}
+func New(eth core.Backend, mux *event.TypeMux, pow pow.PoW) *Miner {
+	miner := &Miner{eth: eth, mux: mux, pow: pow, worker: newWorker(common.Address{}, eth), canStart: 1}
+	go miner.update()
+
+	return miner
 }
 
-func (self *Miner) Mining() bool {
-	return self.mining
+func (self *Miner) update() {
+	events := self.mux.Subscribe(downloader.StartEvent{}, downloader.DoneEvent{}, downloader.FailedEvent{})
+	for ev := range events.Chan() {
+		switch ev.(type) {
+		case downloader.StartEvent:
+			atomic.StoreInt32(&self.canStart, 0)
+			if self.Mining() {
+				self.Stop()
+				glog.V(logger.Info).Infoln("Mining operation aborted due to sync operation")
+			}
+		case downloader.DoneEvent, downloader.FailedEvent:
+			shouldStart := atomic.LoadInt32(&self.shouldStart) == 1
+
+			atomic.StoreInt32(&self.canStart, 1)
+			atomic.StoreInt32(&self.shouldStart, 0)
+			if shouldStart {
+				self.Start(self.coinbase, self.threads)
+			}
+		}
+	}
 }
 
 func (m *Miner) SetGasPrice(price *big.Int) {
@@ -41,34 +71,46 @@ func (m *Miner) SetGasPrice(price *big.Int) {
 }
 
 func (self *Miner) Start(coinbase common.Address, threads int) {
+	atomic.StoreInt32(&self.shouldStart, 1)
+	self.threads = threads
+	self.worker.coinbase = coinbase
+
+	if atomic.LoadInt32(&self.canStart) == 0 {
+		glog.V(logger.Info).Infoln("Can not start mining operation due to network sync (starts when finished)")
+		return
+	}
 
-	self.mining = true
+	atomic.StoreInt32(&self.mining, 1)
 
 	for i := 0; i < threads; i++ {
 		self.worker.register(NewCpuAgent(i, self.pow))
 	}
-	self.threads = threads
 
 	glog.V(logger.Info).Infof("Starting mining operation (CPU=%d TOT=%d)\n", threads, len(self.worker.agents))
 
-	self.worker.coinbase = coinbase
 	self.worker.start()
+
 	self.worker.commitNewWork()
 }
 
 func (self *Miner) Stop() {
 	self.worker.stop()
-	self.mining = false
+	atomic.StoreInt32(&self.mining, 0)
+	atomic.StoreInt32(&self.shouldStart, 0)
 }
 
 func (self *Miner) Register(agent Agent) {
-	if self.mining {
+	if atomic.LoadInt32(&self.mining) == 0 {
 		agent.Start()
 	}
 
 	self.worker.register(agent)
 }
 
+func (self *Miner) Mining() bool {
+	return atomic.LoadInt32(&self.mining) > 0
+}
+
 func (self *Miner) HashRate() int64 {
 	return self.pow.GetHashrate()
 }