eth: began split up of peers and protocol manager

1 files changed, 224 insertions, 0 deletions

diff --git a/eth/handler.go b/eth/handler.go
new file mode 100644
index 000000000..b3890d365
--- /dev/null
+++ b/eth/handler.go
@@ -0,0 +1,224 @@
+package eth
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"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"
+	"github.com/ethereum/go-ethereum/rlp"
+)
+
+func errResp(code errCode, format string, v ...interface{}) error {
+	return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
+}
+
+// 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, downloader *downloader.Downloader) p2p.Protocol {
+	protocol := newProtocolManager(txPool, chainManager, downloader)
+
+	return p2p.Protocol{
+		Name:    "eth",
+		Version: uint(protocolVersion),
+		Length:  ProtocolLength,
+		Run: func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
+			//return runEthProtocol(protocolVersion, networkId, txPool, chainManager, downloader, p, rw)
+			peer := protocol.newPeer(protocolVersion, networkId, p, rw)
+			err := protocol.handle(peer)
+			glog.V(logger.Detail).Infof("[%s]: %v\n", peer.id, err)
+
+			return err
+		},
+	}
+}
+
+type hashFetcherFn func(common.Hash) error
+type blockFetcherFn func([]common.Hash) error
+
+// extProt is an interface which is passed around so we can expose GetHashes and GetBlock without exposing it to the rest of the protocol
+// extProt is passed around to peers which require to GetHashes and GetBlocks
+type extProt struct {
+	getHashes hashFetcherFn
+	getBlocks blockFetcherFn
+}
+
+func (ep extProt) GetHashes(hash common.Hash) error    { return ep.getHashes(hash) }
+func (ep extProt) GetBlock(hashes []common.Hash) error { return ep.getBlocks(hashes) }
+
+type EthProtocolManager struct {
+	protVer, netId int
+	txpool         txPool
+	chainman       chainManager
+	downloader     *downloader.Downloader
+
+	pmu   sync.Mutex
+	peers map[string]*peer
+}
+
+func newProtocolManager(txpool txPool, chainman chainManager, downloader *downloader.Downloader) *EthProtocolManager {
+	return &EthProtocolManager{
+		txpool:     txpool,
+		chainman:   chainman,
+		downloader: downloader,
+		peers:      make(map[string]*peer),
+	}
+}
+
+func (pm *EthProtocolManager) newPeer(pv, nv int, p *p2p.Peer, rw p2p.MsgReadWriter) *peer {
+	pm.pmu.Lock()
+	defer pm.pmu.Unlock()
+
+	td, current, genesis := pm.chainman.Status()
+
+	peer := newPeer(pv, nv, genesis, current, td, p, rw)
+	pm.peers[peer.id] = peer
+
+	return peer
+}
+
+func (pm *EthProtocolManager) handle(p *peer) error {
+	if err := p.handleStatus(); err != nil {
+		return err
+	}
+
+	pm.downloader.RegisterPeer(p.id, p.td, p.currentHash, p.requestHashes, p.requestBlocks)
+	defer pm.downloader.UnregisterPeer(p.id)
+
+	// propagate existing transactions. new transactions appearing
+	// after this will be sent via broadcasts.
+	if err := p.sendTransactions(pm.txpool.GetTransactions()); err != nil {
+		return err
+	}
+
+	// main loop. handle incoming messages.
+	for {
+		if err := pm.handleMsg(p); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (self *EthProtocolManager) handleMsg(p *peer) error {
+	msg, err := p.rw.ReadMsg()
+	if err != nil {
+		return err
+	}
+	if msg.Size > ProtocolMaxMsgSize {
+		return errResp(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
+	}
+	// make sure that the payload has been fully consumed
+	defer msg.Discard()
+
+	switch msg.Code {
+	case GetTxMsg: // ignore
+	case StatusMsg:
+		return errResp(ErrExtraStatusMsg, "uncontrolled status message")
+
+	case TxMsg:
+		// TODO: rework using lazy RLP stream
+		var txs []*types.Transaction
+		if err := msg.Decode(&txs); err != nil {
+			return errResp(ErrDecode, "msg %v: %v", msg, err)
+		}
+		for i, tx := range txs {
+			if tx == nil {
+				return errResp(ErrDecode, "transaction %d is nil", i)
+			}
+			jsonlogger.LogJson(&logger.EthTxReceived{
+				TxHash:   tx.Hash().Hex(),
+				RemoteId: p.ID().String(),
+			})
+		}
+		self.txpool.AddTransactions(txs)
+
+	case GetBlockHashesMsg:
+		var request getBlockHashesMsgData
+		if err := msg.Decode(&request); err != nil {
+			return errResp(ErrDecode, "->msg %v: %v", msg, err)
+		}
+
+		if request.Amount > maxHashes {
+			request.Amount = maxHashes
+		}
+		hashes := self.chainman.GetBlockHashesFromHash(request.Hash, request.Amount)
+		return p.sendBlockHashes(hashes)
+	case BlockHashesMsg:
+		msgStream := rlp.NewStream(msg.Payload)
+
+		var hashes []common.Hash
+		if err := msgStream.Decode(&hashes); err != nil {
+			break
+		}
+		self.downloader.HashCh <- hashes
+
+	case GetBlocksMsg:
+		msgStream := rlp.NewStream(msg.Payload)
+		if _, err := msgStream.List(); err != nil {
+			return err
+		}
+
+		var blocks []*types.Block
+		var i int
+		for {
+			i++
+			var hash common.Hash
+			err := msgStream.Decode(&hash)
+			if err == rlp.EOL {
+				break
+			} else if err != nil {
+				return errResp(ErrDecode, "msg %v: %v", msg, err)
+			}
+
+			block := self.chainman.GetBlock(hash)
+			if block != nil {
+				blocks = append(blocks, block)
+			}
+			if i == maxBlocks {
+				break
+			}
+		}
+		return p.sendBlocks(blocks)
+	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(p.id, blocks)
+
+	case NewBlockMsg:
+		var request newBlockMsgData
+		if err := msg.Decode(&request); err != nil {
+			return errResp(ErrDecode, "%v: %v", msg, err)
+		}
+		if err := request.Block.ValidateFields(); err != nil {
+			return errResp(ErrDecode, "block validation %v: %v", msg, err)
+		}
+		hash := request.Block.Hash()
+		_, chainHead, _ := self.chainman.Status()
+
+		jsonlogger.LogJson(&logger.EthChainReceivedNewBlock{
+			BlockHash:     hash.Hex(),
+			BlockNumber:   request.Block.Number(), // this surely must be zero
+			ChainHeadHash: chainHead.Hex(),
+			BlockPrevHash: request.Block.ParentHash().Hex(),
+			RemoteId:      p.ID().String(),
+		})
+		self.downloader.AddBlock(p.id, request.Block, request.TD)
+
+	default:
+		return errResp(ErrInvalidMsgCode, "%v", msg.Code)
+	}
+	return nil
+}