eth: added downloader for syncing up the chain

eth/backend.go

@@ -15,6 +15,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
@@ -130,6 +131,7 @@ type Ethereum struct {
 	accountManager *accounts.Manager
 	whisper        *whisper.Whisper
 	pow            *ethash.Ethash
+	downloader     *downloader.Downloader
 
 	net      *p2p.Server
 	eventMux *event.TypeMux
@@ -194,6 +196,7 @@ func New(config *Config) (*Ethereum, error) {
 	}
 
 	eth.chainManager = core.NewChainManager(blockDb, stateDb, eth.EventMux())
+	eth.downloader = downloader.New(eth.chainManager.HasBlock, eth.chainManager.InsertChain, eth.chainManager.Td)
 	eth.pow = ethash.New(eth.chainManager)
 	eth.txPool = core.NewTxPool(eth.EventMux(), eth.chainManager.State)
 	eth.blockProcessor = core.NewBlockProcessor(stateDb, extraDb, eth.pow, eth.txPool, eth.chainManager, eth.EventMux())
@@ -212,7 +215,7 @@ func New(config *Config) (*Ethereum, error) {
 		return nil, err
 	}
 
-	ethProto := EthProtocol(config.ProtocolVersion, config.NetworkId, eth.txPool, eth.chainManager, eth.blockPool)
+	ethProto := EthProtocol(config.ProtocolVersion, config.NetworkId, eth.txPool, eth.chainManager, eth.blockPool, eth.downloader)
 	protocols := []p2p.Protocol{ethProto}
 	if config.Shh {
 		protocols = append(protocols, eth.whisper.Protocol())
@@ -349,6 +352,7 @@ func (s *Ethereum) ClientVersion() string                { return s.clientVersio
 func (s *Ethereum) EthVersion() int                      { return s.ethVersionId }
 func (s *Ethereum) NetVersion() int                      { return s.netVersionId }
 func (s *Ethereum) ShhVersion() int                      { return s.shhVersionId }
+func (s *Ethereum) Downloader() *downloader.Downloader   { return s.downloader }
 
 // Start the ethereum
 func (s *Ethereum) Start() error {

eth/protocol.go

@@ -7,6 +7,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/errs"
+	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
 	"github.com/ethereum/go-ethereum/p2p"
@@ -18,8 +19,8 @@ const (
 	NetworkId          = 0
 	ProtocolLength     = uint64(8)
 	ProtocolMaxMsgSize = 10 * 1024 * 1024
-	maxHashes          = 256
+	maxHashes          = 512
-	maxBlocks          = 64
+	maxBlocks          = 128
 )
 
 // eth protocol message codes
@@ -64,6 +65,7 @@ type ethProtocol struct {
 	txPool          txPool
 	chainManager    chainManager
 	blockPool       blockPool
+	downloader      *downloader.Downloader
 	peer            *p2p.Peer
 	id              string
 	rw              p2p.MsgReadWriter
@@ -114,25 +116,26 @@ type statusMsgData struct {
 // main entrypoint, wrappers starting a server running the eth protocol
 // use this constructor to attach the protocol ("class") to server caps
 // the Dev p2p layer then runs the protocol instance on each peer
-func EthProtocol(protocolVersion, networkId int, txPool txPool, chainManager chainManager, blockPool blockPool) p2p.Protocol {
+func EthProtocol(protocolVersion, networkId int, txPool txPool, chainManager chainManager, blockPool blockPool, downloader *downloader.Downloader) p2p.Protocol {
 	return p2p.Protocol{
 		Name:    "eth",
 		Version: uint(protocolVersion),
 		Length:  ProtocolLength,
 		Run: func(peer *p2p.Peer, rw p2p.MsgReadWriter) error {
-			return runEthProtocol(protocolVersion, networkId, txPool, chainManager, blockPool, peer, rw)
+			return runEthProtocol(protocolVersion, networkId, txPool, chainManager, blockPool, downloader, peer, rw)
 		},
 	}
 }
 
 // the main loop that handles incoming messages
 // note RemovePeer in the post-disconnect hook
-func runEthProtocol(protocolVersion, networkId int, txPool txPool, chainManager chainManager, blockPool blockPool, peer *p2p.Peer, rw p2p.MsgReadWriter) (err error) {
+func runEthProtocol(protocolVersion, networkId int, txPool txPool, chainManager chainManager, blockPool blockPool, downloader *downloader.Downloader, peer *p2p.Peer, rw p2p.MsgReadWriter) (err error) {
 	id := peer.ID()
 	self := &ethProtocol{
 		txPool:          txPool,
 		chainManager:    chainManager,
 		blockPool:       blockPool,
+		downloader:      downloader,
 		rw:              rw,
 		peer:            peer,
 		protocolVersion: protocolVersion,
@@ -211,24 +214,33 @@ func (self *ethProtocol) handle() error {
 
 	case BlockHashesMsg:
 		msgStream := rlp.NewStream(msg.Payload)
+
+		var hashes []common.Hash
+		if err := msgStream.Decode(&hashes); err != nil {
+			break
+		}
+		self.downloader.HashCh <- hashes
+
+		/*
 			if _, err := msgStream.List(); err != nil {
 				return err
 			}
 
 			var i int
-		iter := func() (hash common.Hash, ok bool) {
+			iter := func() (hash common.Hash, err error) {
-			err := msgStream.Decode(&hash)
+				err = msgStream.Decode(&hash)
 				if err == rlp.EOL {
-				return common.Hash{}, false
+					return common.Hash{}, err
 				} else if err != nil {
-				self.protoError(ErrDecode, "msg %v: after %v hashes : %v", msg, i, err)
+					return common.Hash{}, fmt.Errorf("Fetching hashes err (%d): %v", i, err)
-				return common.Hash{}, false
 				}
 
 				i++
-			return hash, true
+				return hash, nil
 			}
-		self.blockPool.AddBlockHashes(iter, self.id)
+			self.downloader.HashCh <- iter
+			//self.blockPool.AddBlockHashes(iter, self.id)
+		*/
 
 	case GetBlocksMsg:
 		msgStream := rlp.NewStream(msg.Payload)
@@ -260,6 +272,16 @@ func (self *ethProtocol) handle() error {
 
 	case BlocksMsg:
 		msgStream := rlp.NewStream(msg.Payload)
+
+		var blocks []*types.Block
+		if err := msgStream.Decode(&blocks); err != nil {
+			glog.V(logger.Detail).Infoln("Decode error", err)
+			fmt.Println("decode error", err)
+			blocks = nil
+		}
+		self.downloader.DeliverChunk(self.id, blocks)
+		/*
+			msgStream := rlp.NewStream(msg.Payload)
 			if _, err := msgStream.List(); err != nil {
 				return err
 			}
@@ -277,6 +299,7 @@ func (self *ethProtocol) handle() error {
 				}
 				self.blockPool.AddBlock(&block, self.id)
 			}
+		*/
 
 	case NewBlockMsg:
 		var request newBlockMsgData
@@ -296,6 +319,8 @@ func (self *ethProtocol) handle() error {
 			BlockPrevHash: request.Block.ParentHash().Hex(),
 			RemoteId:      self.peer.ID().String(),
 		})
+
+		self.downloader.AddBlock(self.id, request.Block, request.TD)
 		// to simplify backend interface adding a new block
 		// uses AddPeer followed by AddBlock only if peer is the best peer
 		// (or selected as new best peer)
@@ -345,10 +370,16 @@ func (self *ethProtocol) handleStatus() error {
 		return self.protoError(ErrProtocolVersionMismatch, "%d (!= %d)", status.ProtocolVersion, self.protocolVersion)
 	}
 
+	err = self.downloader.RegisterPeer(self.id, status.TD, status.CurrentBlock, self.requestBlockHashes, self.requestBlocks)
+	if err != nil {
+		return self.protoError(ErrSuspendedPeer, "something")
+	}
+	/*
 		_, suspended := self.blockPool.AddPeer(status.TD, status.CurrentBlock, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect)
 		if suspended {
 			return self.protoError(ErrSuspendedPeer, "")
 		}
+	*/
 
 	self.peer.Debugf("Peer is [eth] capable (%d/%d). TD=%v H=%x\n", status.ProtocolVersion, status.NetworkId, status.TD, status.CurrentBlock[:4])