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Merge pull request #1188 from karalabe/newblockhashes-proposal

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eth: implement the NewBlockHashes protocol proposal
This commit is contained in:
Jeffrey Wilcke 2015-06-09 04:07:46 -07:00
commit 05cae69d72
4 changed files with 262 additions and 81 deletions
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202
eth/handler.go
View File

@ -2,6 +2,7 @@ package eth
import (
"fmt"
"math"
"math/big"
"sync"
"time"
@ -17,13 +18,6 @@ import (
"github.com/ethereum/go-ethereum/rlp"
)
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
minDesiredPeerCount = 5 // Amount of peers desired to start syncing
blockProcAmount = 256
)
func errResp(code errCode, format string, v ...interface{}) error {
return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
}
@ -54,8 +48,11 @@ type ProtocolManager struct {
txSub event.Subscription
minedBlockSub event.Subscription
newPeerCh chan *peer
quitSync chan struct{}
newPeerCh chan *peer
newHashCh chan []*blockAnnounce
newBlockCh chan chan []*types.Block
quitSync chan struct{}
// wait group is used for graceful shutdowns during downloading
// and processing
wg sync.WaitGroup
@ -72,6 +69,8 @@ func NewProtocolManager(protocolVersion, networkId int, mux *event.TypeMux, txpo
downloader: downloader,
peers: newPeerSet(),
newPeerCh: make(chan *peer, 1),
newHashCh: make(chan []*blockAnnounce, 1),
newBlockCh: make(chan chan []*types.Block),
quitSync: make(chan struct{}),
}
@ -119,7 +118,8 @@ func (pm *ProtocolManager) Start() {
pm.minedBlockSub = pm.eventMux.Subscribe(core.NewMinedBlockEvent{})
go pm.minedBroadcastLoop()
go pm.update()
go pm.syncer()
go pm.fetcher()
}
func (pm *ProtocolManager) Stop() {
@ -186,7 +186,6 @@ 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 +226,7 @@ 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))
@ -266,15 +266,66 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
}
}
return p.sendBlocks(blocks)
case BlocksMsg:
var blocks []*types.Block
case BlocksMsg:
// Decode the arrived block message
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
var blocks []*types.Block
if err := msgStream.Decode(&blocks); err != nil {
glog.V(logger.Detail).Infoln("Decode error", err)
blocks = nil
}
self.downloader.DeliverBlocks(p.id, blocks)
// Filter out any explicitly requested blocks (cascading select to get blocking back to peer)
filter := make(chan []*types.Block)
select {
case <-self.quitSync:
case self.newBlockCh <- filter:
select {
case <-self.quitSync:
case filter <- blocks:
select {
case <-self.quitSync:
case blocks := <-filter:
self.downloader.DeliverBlocks(p.id, blocks)
}
}
}
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
}
// Schedule all the unknown hashes for retrieval
unknown := make([]common.Hash, 0, len(hashes))
for _, hash := range hashes {
if !self.chainman.HasBlock(hash) {
unknown = append(unknown, hash)
}
}
announces := make([]*blockAnnounce, len(unknown))
for i, hash := range unknown {
announces[i] = &blockAnnounce{
hash: hash,
peer: p,
time: time.Now(),
}
}
if len(announces) > 0 {
select {
case self.newHashCh <- announces:
case <-self.quitSync:
}
}
case NewBlockMsg:
var request newBlockMsgData
@ -286,83 +337,86 @@ 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(),
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]
notify := peers[split:]
// Send out the data transfers and the notifications
for _, peer := range notify {
peer.sendNewBlockHashes([]common.Hash{hash})
}
glog.V(logger.Detail).Infoln("broadcast hash to", len(notify), "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

7
eth/peer.go
View File

@ -88,6 +88,13 @@ func (p *peer) sendBlocks(blocks []*types.Block) error {
return p2p.Send(p.rw, BlocksMsg, blocks)
}
func (p *peer) sendNewBlockHashes(hashes []common.Hash) error {
for _, hash := range hashes {
p.blockHashes.Add(hash)
}
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

132
eth/sync.go
View File

@ -5,15 +5,135 @@ import (
"sync/atomic"
"time"
"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"
)
// update periodically tries to synchronise with the network, both downloading
// hashes and blocks as well as retrieving cached ones.
func (pm *ProtocolManager) update() {
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
notifyCheckCycle = 100 * time.Millisecond // Time interval to allow hash notifies to fulfill before hard fetching
notifyArriveTimeout = 500 * time.Millisecond // Time allowance before an announced block is explicitly requested
notifyFetchTimeout = 5 * time.Second // Maximum alloted time to return an explicitly requested block
minDesiredPeerCount = 5 // Amount of peers desired to start syncing
blockProcAmount = 256
)
// blockAnnounce is the hash notification of the availability of a new block in
// the network.
type blockAnnounce struct {
hash common.Hash
peer *peer
time time.Time
}
// fetcher is responsible for collecting hash notifications, and periodically
// checking all unknown ones and individually fetching them.
func (pm *ProtocolManager) fetcher() {
announces := make(map[common.Hash]*blockAnnounce)
request := make(map[*peer][]common.Hash)
pending := make(map[common.Hash]*blockAnnounce)
cycle := time.Tick(notifyCheckCycle)
// Iterate the block fetching until a quit is requested
for {
select {
case notifications := <-pm.newHashCh:
// A batch of hashes the notified, schedule them for retrieval
glog.V(logger.Debug).Infof("Scheduling %d hash announcements from %s", len(notifications), notifications[0].peer.id)
for _, announce := range notifications {
announces[announce.hash] = announce
}
case <-cycle:
// Clean up any expired block fetches
for hash, announce := range pending {
if time.Since(announce.time) > notifyFetchTimeout {
delete(pending, hash)
}
}
// Check if any notified blocks failed to arrive
for hash, announce := range announces {
if time.Since(announce.time) > notifyArriveTimeout {
if !pm.chainman.HasBlock(hash) {
request[announce.peer] = append(request[announce.peer], hash)
pending[hash] = announce
}
delete(announces, hash)
}
}
if len(request) == 0 {
break
}
// Send out all block requests
for peer, hashes := range request {
glog.V(logger.Debug).Infof("Explicitly fetching %d blocks from %s", len(hashes), peer.id)
peer.requestBlocks(hashes)
}
request = make(map[*peer][]common.Hash)
case filter := <-pm.newBlockCh:
// Blocks arrived, extract any explicit fetches, return all else
var blocks types.Blocks
select {
case blocks = <-filter:
case <-pm.quitSync:
return
}
explicit, download := []*types.Block{}, []*types.Block{}
for _, block := range blocks {
hash := block.Hash()
// Filter explicitly requested blocks from hash announcements
if _, ok := pending[hash]; ok {
// Discard if already imported by other means
if !pm.chainman.HasBlock(hash) {
explicit = append(explicit, block)
} else {
delete(pending, hash)
}
} else {
download = append(download, block)
}
}
select {
case filter <- download:
case <-pm.quitSync:
return
}
// If any explicit fetches were replied to, import them
if count := len(explicit); count > 0 {
glog.V(logger.Debug).Infof("Importing %d explicitly fetched blocks", count)
go func() {
for _, block := range explicit {
hash := block.Hash()
// Make sure there's still something pending to import
if announce := pending[hash]; announce != nil {
delete(pending, hash)
if err := pm.importBlock(announce.peer, block, nil); err != nil {
glog.V(logger.Detail).Infof("Failed to import explicitly fetched block: %v", err)
return
}
}
}
}()
}
case <-pm.quitSync:
return
}
}
}
// syncer is responsible for periodically synchronising with the network, both
// downloading hashes and blocks as well as retrieving cached ones.
func (pm *ProtocolManager) syncer() {
forceSync := time.Tick(forceSyncCycle)
blockProc := time.Tick(blockProcCycle)
blockProcPend := int32(0)
@ -99,15 +219,15 @@ func (pm *ProtocolManager) synchronise(peer *peer) {
return
}
// Get the hashes from the peer (synchronously)
glog.V(logger.Debug).Infof("Attempting synchronisation: %v, 0x%x", peer.id, peer.recentHash)
glog.V(logger.Detail).Infof("Attempting synchronisation: %v, 0x%x", peer.id, peer.recentHash)
err := pm.downloader.Synchronise(peer.id, peer.recentHash)
switch err {
case nil:
glog.V(logger.Debug).Infof("Synchronisation completed")
glog.V(logger.Detail).Infof("Synchronisation completed")
case downloader.ErrBusy:
glog.V(logger.Debug).Infof("Synchronisation already in progress")
glog.V(logger.Detail).Infof("Synchronisation already in progress")
case downloader.ErrTimeout, downloader.ErrBadPeer, downloader.ErrEmptyHashSet, downloader.ErrInvalidChain, downloader.ErrCrossCheckFailed:
glog.V(logger.Debug).Infof("Removing peer %v: %v", peer.id, err)