Merge pull request #778 from bas-vk/issue764

Moved database update loop to eth/backend

common/db.go

@@ -7,4 +7,5 @@ type Database interface {
 	Delete(key []byte) error
 	LastKnownTD() []byte
 	Close()
+	Flush() error
 }

core/chain_manager.go

@@ -342,14 +342,14 @@ func (self *ChainManager) Export(w io.Writer) error {
 }
 
 func (bc *ChainManager) insert(block *types.Block) {
+	key := append(blockNumPre, block.Number().Bytes()...)
+	bc.blockDb.Put(key, block.Hash().Bytes())
+	// Push block to cache
+	bc.cache.Push(block)
+
 	bc.blockDb.Put([]byte("LastBlock"), block.Hash().Bytes())
 	bc.currentBlock = block
 	bc.lastBlockHash = block.Hash()
-
-	key := append(blockNumPre, block.Number().Bytes()...)
-	bc.blockDb.Put(key, bc.lastBlockHash.Bytes())
-	// Push block to cache
-	bc.cache.Push(block)
 }
 
 func (bc *ChainManager) write(block *types.Block) {

eth/backend.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"path"
 	"strings"
+	"time"
 
 	"github.com/ethereum/ethash"
 	"github.com/ethereum/go-ethereum/accounts"
@@ -123,6 +124,8 @@ type Ethereum struct {
 	blockDb common.Database // Block chain database
 	stateDb common.Database // State changes database
 	extraDb common.Database // Extra database (txs, etc)
+	// Closed when databases are flushed and closed
+	databasesClosed chan bool
 
 	//*** SERVICES ***
 	// State manager for processing new blocks and managing the over all states
@@ -198,6 +201,7 @@ func New(config *Config) (*Ethereum, error) {
 
 	eth := &Ethereum{
 		shutdownChan:    make(chan bool),
+		databasesClosed: make(chan bool),
 		blockDb:         blockDb,
 		stateDb:         stateDb,
 		extraDb:         extraDb,
@@ -376,6 +380,9 @@ func (s *Ethereum) Start() error {
 		}
 	}
 
+	// periodically flush databases
+	go s.syncDatabases()
+
 	// Start services
 	go s.txPool.Start()
 	s.protocolManager.Start()
@@ -392,6 +399,34 @@ func (s *Ethereum) Start() error {
 	return nil
 }
 
+func (s *Ethereum) syncDatabases() {
+	ticker := time.NewTicker(1 * time.Minute)
+done:
+	for {
+		select {
+		case <-ticker.C:
+			// don't change the order of database flushes
+			if err := s.extraDb.Flush(); err != nil {
+				glog.V(logger.Error).Infof("error: flush extraDb: %v\n", err)
+			}
+			if err := s.stateDb.Flush(); err != nil {
+				glog.V(logger.Error).Infof("error: flush stateDb: %v\n", err)
+			}
+			if err := s.blockDb.Flush(); err != nil {
+				glog.V(logger.Error).Infof("error: flush blockDb: %v\n", err)
+			}
+		case <-s.shutdownChan:
+			break done
+		}
+	}
+
+	s.blockDb.Close()
+	s.stateDb.Close()
+	s.extraDb.Close()
+
+	close(s.databasesClosed)
+}
+
 func (s *Ethereum) StartForTest() {
 	jsonlogger.LogJson(&logger.LogStarting{
 		ClientString:    s.net.Name,
@@ -412,11 +447,6 @@ func (self *Ethereum) SuggestPeer(nodeURL string) error {
 }
 
 func (s *Ethereum) Stop() {
-	// Close the database
-	defer s.blockDb.Close()
-	defer s.stateDb.Close()
-	defer s.extraDb.Close()
-
 	s.txSub.Unsubscribe()         // quits txBroadcastLoop
 
 	s.protocolManager.Stop()
@@ -432,6 +462,7 @@ func (s *Ethereum) Stop() {
 
 // This function will wait for a shutdown and resumes main thread execution
 func (s *Ethereum) WaitForShutdown() {
+	<-s.databasesClosed
 	<-s.shutdownChan
 }
 

ethdb/database.go

@@ -2,7 +2,6 @@ package ethdb
 
 import (
 	"sync"
-	"time"
 
 	"github.com/ethereum/go-ethereum/compression/rle"
 	"github.com/ethereum/go-ethereum/logger"
@@ -35,8 +34,6 @@ func NewLDBDatabase(file string) (*LDBDatabase, error) {
 	}
 	database.makeQueue()
 
-	go database.update()
-
 	return database, nil
 }
 
@@ -111,35 +108,16 @@ func (self *LDBDatabase) Flush() error {
 	}
 	self.makeQueue() // reset the queue
 
+	glog.V(logger.Detail).Infoln("Flush database: ", self.fn)
+
 	return self.db.Write(batch, nil)
 }
 
 func (self *LDBDatabase) Close() {
-	self.quit <- struct{}{}
-	<-self.quit
-	glog.V(logger.Info).Infoln("flushed and closed db:", self.fn)
-}
-
-func (self *LDBDatabase) update() {
-	ticker := time.NewTicker(1 * time.Minute)
-done:
-	for {
-		select {
-		case <-ticker.C:
-			if err := self.Flush(); err != nil {
-				glog.V(logger.Error).Infof("error: flush '%s': %v\n", self.fn, err)
-			}
-		case <-self.quit:
-			break done
-		}
-	}
-
 	if err := self.Flush(); err != nil {
 		glog.V(logger.Error).Infof("error: flush '%s': %v\n", self.fn, err)
 	}
 
-	// Close the leveldb database
 	self.db.Close()
-
-	self.quit <- struct{}{}
+	glog.V(logger.Error).Infoln("flushed and closed db:", self.fn)
 }

ethdb/memory_database.go

@@ -65,3 +65,7 @@ func (db *MemDatabase) LastKnownTD() []byte {
 
 	return data
 }
+
+func (db *MemDatabase) Flush() error {
+	return nil
+}