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eth: implement the NewBlockHashes protocol proposal

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This commit is contained in:
Péter Szilágyi
2015-06-04 18:46:07 +03:00
parent c6faa18ec9
commit 6f415b96b3
3 changed files with 123 additions and 63 deletions
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178
eth/handler.go
View File

@@ -2,6 +2,7 @@ package eth
import (
"fmt"
"math"
"math/big"
"sync"
"time"
@@ -20,6 +21,7 @@ import (
const (
forceSyncCycle = 10 * time.Second // Time interval to force syncs, even if few peers are available
blockProcCycle = 500 * time.Millisecond // Time interval to check for new blocks to process
blockArrivalTimeout = 500 * time.Millisecond // Time allowance before an announced block is explicitly requested
minDesiredPeerCount = 5 // Amount of peers desired to start syncing
blockProcAmount = 256
)
@@ -186,7 +188,6 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
defer msg.Discard()
switch msg.Code {
case GetTxMsg: // ignore
case StatusMsg:
return errResp(ErrExtraStatusMsg, "uncontrolled status message")
@@ -227,6 +228,7 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
// returns either requested hashes or nothing (i.e. not found)
return p.sendBlockHashes(hashes)
case BlockHashesMsg:
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
@@ -266,6 +268,7 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
}
}
return p.sendBlocks(blocks)
case BlocksMsg:
var blocks []*types.Block
@@ -274,7 +277,57 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
glog.V(logger.Detail).Infoln("Decode error", err)
blocks = nil
}
// Either deliver to the downloader or the importer
if self.downloader.Synchronising() {
self.downloader.DeliverBlocks(p.id, blocks)
} else {
for _, block := range blocks {
if err := self.importBlock(p, block, nil); err != nil {
return err
}
}
}
case NewBlockHashesMsg:
// Retrieve and deseralize the remote new block hashes notification
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
var hashes []common.Hash
if err := msgStream.Decode(&hashes); err != nil {
break
}
// Mark the hashes as present at the remote node
for _, hash := range hashes {
p.blockHashes.Add(hash)
p.recentHash = hash
}
// Wait a bit for potentially receiving the blocks, fetch if not
go func() {
time.Sleep(blockArrivalTimeout)
// Drop all the hashes that are already known
unknown := make([]common.Hash, 0, len(hashes))
for _, hash := range hashes {
if !self.chainman.HasBlock(hash) {
unknown = append(unknown, hash)
}
}
if len(unknown) == 0 {
return
}
// Retrieve all the unknown hashes
if err := p.requestBlocks(unknown); err != nil {
glog.V(logger.Debug).Infof("%s: failed to request blocks: %v", p.id, err)
}
if glog.V(logger.Detail) {
hashes := make([]string, len(unknown))
for i, hash := range unknown {
hashes[i] = fmt.Sprintf("%x", hash[:4])
}
glog.Infof("%s: requested blocks explicitly: %v", p.id, hashes)
}
}()
case NewBlockMsg:
var request newBlockMsgData
@@ -286,83 +339,86 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
}
request.Block.ReceivedAt = msg.ReceivedAt
hash := request.Block.Hash()
// Add the block hash as a known hash to the peer. This will later be used to determine
// who should receive this.
p.blockHashes.Add(hash)
// update the peer info
p.recentHash = hash
p.td = request.TD
_, 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(),
})
// Make sure the block isn't already known. If this is the case simply drop
// the message and move on. If the TD is < currentTd; drop it as well. If this
// chain at some point becomes canonical, the downloader will fetch it.
if self.chainman.HasBlock(hash) {
break
}
if self.chainman.Td().Cmp(request.TD) > 0 && new(big.Int).Add(request.Block.Number(), big.NewInt(7)).Cmp(self.chainman.CurrentBlock().Number()) < 0 {
glog.V(logger.Debug).Infof("[%s] dropped block %v due to low TD %v\n", p.id, request.Block.Number(), request.TD)
break
if err := self.importBlock(p, request.Block, request.TD); err != nil {
return err
}
// Attempt to insert the newly received by checking if the parent exists.
// if the parent exists we process the block and propagate to our peers
// otherwise synchronize with the peer
if self.chainman.HasBlock(request.Block.ParentHash()) {
if _, err := self.chainman.InsertChain(types.Blocks{request.Block}); err != nil {
glog.V(logger.Error).Infoln("removed peer (", p.id, ") due to block error")
self.removePeer(p.id)
return nil
}
if err := self.verifyTd(p, request); err != nil {
glog.V(logger.Error).Infoln(err)
// XXX for now return nil so it won't disconnect (we should in the future)
return nil
}
self.BroadcastBlock(hash, request.Block)
} else {
go self.synchronise(p)
}
default:
return errResp(ErrInvalidMsgCode, "%v", msg.Code)
}
return nil
}
func (pm *ProtocolManager) verifyTd(peer *peer, request newBlockMsgData) error {
if request.Block.Td.Cmp(request.TD) != 0 {
glog.V(logger.Detail).Infoln(peer)
// importBlocks injects a new block retrieved from the given peer into the chain
// manager.
func (pm *ProtocolManager) importBlock(p *peer, block *types.Block, td *big.Int) error {
hash := block.Hash()
return fmt.Errorf("invalid TD on block(%v) from peer(%s): block.td=%v, request.td=%v", request.Block.Number(), peer.id, request.Block.Td, request.TD)
// Mark the block as present at the remote node (don't duplicate already held data)
p.blockHashes.Add(hash)
p.recentHash = hash
if td != nil {
p.td = td
}
// Log the block's arrival
_, chainHead, _ := pm.chainman.Status()
jsonlogger.LogJson(&logger.EthChainReceivedNewBlock{
BlockHash: hash.Hex(),
BlockNumber: block.Number(), // this surely must be zero
ChainHeadHash: chainHead.Hex(),
BlockPrevHash: block.ParentHash().Hex(),
RemoteId: p.ID().String(),
})
// If the block's already known or its difficulty is lower than ours, drop
if pm.chainman.HasBlock(hash) {
p.td = pm.chainman.GetBlock(hash).Td // update the peer's TD to the real value
return nil
}
if td != nil && pm.chainman.Td().Cmp(td) > 0 && new(big.Int).Add(block.Number(), big.NewInt(7)).Cmp(pm.chainman.CurrentBlock().Number()) < 0 {
glog.V(logger.Debug).Infof("[%s] dropped block %v due to low TD %v\n", p.id, block.Number(), td)
return nil
}
// Attempt to insert the newly received block and propagate to our peers
if pm.chainman.HasBlock(block.ParentHash()) {
if _, err := pm.chainman.InsertChain(types.Blocks{block}); err != nil {
glog.V(logger.Error).Infoln("removed peer (", p.id, ") due to block error", err)
return err
}
if td != nil && block.Td.Cmp(td) != 0 {
err := fmt.Errorf("invalid TD on block(%v) from peer(%s): block.td=%v, request.td=%v", block.Number(), p.id, block.Td, td)
glog.V(logger.Error).Infoln(err)
return err
}
pm.BroadcastBlock(hash, block)
return nil
}
// Parent of the block is unknown, try to sync with this peer if it seems to be good
if td != nil {
go pm.synchronise(p)
}
return nil
}
// BroadcastBlock will propagate the block to its connected peers. It will sort
// out which peers do not contain the block in their block set and will do a
// sqrt(peers) to determine the amount of peers we broadcast to.
// BroadcastBlock will propagate the block to a subset of its connected peers,
// only notifying the rest of the block's appearance.
func (pm *ProtocolManager) BroadcastBlock(hash common.Hash, block *types.Block) {
// Broadcast block to a batch of peers not knowing about it
// Retrieve all the target peers and split between full broadcast or only notification
peers := pm.peers.PeersWithoutBlock(hash)
//peers = peers[:int(math.Sqrt(float64(len(peers))))]
for _, peer := range peers {
split := int(math.Sqrt(float64(len(peers))))
transfer := peers[:split]
nofity := peers[split:]
// Send out the data transfers and the notifications
for _, peer := range nofity {
peer.sendNewBlockHashes([]common.Hash{hash})
}
glog.V(logger.Detail).Infoln("broadcast hash to", len(nofity), "peers.")
for _, peer := range transfer {
peer.sendNewBlock(block)
}
glog.V(logger.Detail).Infoln("broadcast block to", len(peers), "peers. Total processing time:", time.Since(block.ReceivedAt))
glog.V(logger.Detail).Infoln("broadcast block to", len(transfer), "peers. Total processing time:", time.Since(block.ReceivedAt))
}
// BroadcastTx will propagate the block to its connected peers. It will sort

4
eth/peer.go
View File

@@ -88,6 +88,10 @@ func (p *peer) sendBlocks(blocks []*types.Block) error {
return p2p.Send(p.rw, BlocksMsg, blocks)
}
func (p *peer) sendNewBlockHashes(hashes []common.Hash) error {
return p2p.Send(p.rw, NewBlockHashesMsg, hashes)
}
func (p *peer) sendNewBlock(block *types.Block) error {
p.blockHashes.Add(block.Hash())

2
eth/protocol.go
View File

@@ -17,7 +17,7 @@ const (
// eth protocol message codes
const (
StatusMsg = iota
GetTxMsg // unused
NewBlockHashesMsg
TxMsg
GetBlockHashesMsg
BlockHashesMsg