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Merge pull request #2861 from karalabe/track-peer-heads-properly

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eth, eth/downloader: better remote head tracking
This commit is contained in:
Péter Szilágyi 2016-08-09 11:38:34 +03:00 committed by GitHub
commit 44ea0da2b0
6 changed files with 59 additions and 50 deletions
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7
eth/downloader/downloader.go
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@ -236,12 +236,12 @@ func (d *Downloader) Synchronising() bool {
// RegisterPeer injects a new download peer into the set of block source to be
// used for fetching hashes and blocks from.
func (d *Downloader) RegisterPeer(id string, version int, head common.Hash,
func (d *Downloader) RegisterPeer(id string, version int, currentHead currentHeadRetrievalFn,
getRelHeaders relativeHeaderFetcherFn, getAbsHeaders absoluteHeaderFetcherFn, getBlockBodies blockBodyFetcherFn,
getReceipts receiptFetcherFn, getNodeData stateFetcherFn) error {
glog.V(logger.Detail).Infoln("Registering peer", id)
if err := d.peers.Register(newPeer(id, version, head, getRelHeaders, getAbsHeaders, getBlockBodies, getReceipts, getNodeData)); err != nil {
if err := d.peers.Register(newPeer(id, version, currentHead, getRelHeaders, getAbsHeaders, getBlockBodies, getReceipts, getNodeData)); err != nil {
glog.V(logger.Error).Infoln("Register failed:", err)
return err
}
@ -501,7 +501,8 @@ func (d *Downloader) fetchHeight(p *peer) (*types.Header, error) {
glog.V(logger.Debug).Infof("%v: retrieving remote chain height", p)
// Request the advertised remote head block and wait for the response
go p.getRelHeaders(p.head, 1, 0, false)
head, _ := p.currentHead()
go p.getRelHeaders(head, 1, 0, false)
timeout := time.After(d.requestTTL())
for {

17
eth/downloader/downloader_test.go
View File

@ -400,11 +400,11 @@ func (dl *downloadTester) newSlowPeer(id string, version int, hashes []common.Ha
var err error
switch version {
case 62:
err = dl.downloader.RegisterPeer(id, version, hashes[0], dl.peerGetRelHeadersFn(id, delay), dl.peerGetAbsHeadersFn(id, delay), dl.peerGetBodiesFn(id, delay), nil, nil)
err = dl.downloader.RegisterPeer(id, version, dl.peerCurrentHeadFn(id), dl.peerGetRelHeadersFn(id, delay), dl.peerGetAbsHeadersFn(id, delay), dl.peerGetBodiesFn(id, delay), nil, nil)
case 63:
err = dl.downloader.RegisterPeer(id, version, hashes[0], dl.peerGetRelHeadersFn(id, delay), dl.peerGetAbsHeadersFn(id, delay), dl.peerGetBodiesFn(id, delay), dl.peerGetReceiptsFn(id, delay), dl.peerGetNodeDataFn(id, delay))
err = dl.downloader.RegisterPeer(id, version, dl.peerCurrentHeadFn(id), dl.peerGetRelHeadersFn(id, delay), dl.peerGetAbsHeadersFn(id, delay), dl.peerGetBodiesFn(id, delay), dl.peerGetReceiptsFn(id, delay), dl.peerGetNodeDataFn(id, delay))
case 64:
err = dl.downloader.RegisterPeer(id, version, hashes[0], dl.peerGetRelHeadersFn(id, delay), dl.peerGetAbsHeadersFn(id, delay), dl.peerGetBodiesFn(id, delay), dl.peerGetReceiptsFn(id, delay), dl.peerGetNodeDataFn(id, delay))
err = dl.downloader.RegisterPeer(id, version, dl.peerCurrentHeadFn(id), dl.peerGetRelHeadersFn(id, delay), dl.peerGetAbsHeadersFn(id, delay), dl.peerGetBodiesFn(id, delay), dl.peerGetReceiptsFn(id, delay), dl.peerGetNodeDataFn(id, delay))
}
if err == nil {
// Assign the owned hashes, headers and blocks to the peer (deep copy)
@ -463,6 +463,17 @@ func (dl *downloadTester) dropPeer(id string) {
dl.downloader.UnregisterPeer(id)
}
// peerCurrentHeadFn constructs a function to retrieve a peer's current head hash
// and total difficulty.
func (dl *downloadTester) peerCurrentHeadFn(id string) func() (common.Hash, *big.Int) {
return func() (common.Hash, *big.Int) {
dl.lock.RLock()
defer dl.lock.RUnlock()
return dl.peerHashes[id][0], nil
}
}
// peerGetRelHeadersFn constructs a GetBlockHeaders function based on a hashed
// origin; associated with a particular peer in the download tester. The returned
// function can be used to retrieve batches of headers from the particular peer.

11
eth/downloader/peer.go
View File

@ -23,6 +23,7 @@ import (
"errors"
"fmt"
"math"
"math/big"
"sort"
"strings"
"sync"
@ -37,6 +38,9 @@ const (
measurementImpact = 0.1 // The impact a single measurement has on a peer's final throughput value.
)
// Head hash and total difficulty retriever for
type currentHeadRetrievalFn func() (common.Hash, *big.Int)
// Block header and body fetchers belonging to eth/62 and above
type relativeHeaderFetcherFn func(common.Hash, int, int, bool) error
type absoluteHeaderFetcherFn func(uint64, int, int, bool) error
@ -53,7 +57,6 @@ var (
// peer represents an active peer from which hashes and blocks are retrieved.
type peer struct {
id string // Unique identifier of the peer
head common.Hash // Hash of the peers latest known block
headerIdle int32 // Current header activity state of the peer (idle = 0, active = 1)
blockIdle int32 // Current block activity state of the peer (idle = 0, active = 1)
@ -74,6 +77,8 @@ type peer struct {
lacking map[common.Hash]struct{} // Set of hashes not to request (didn't have previously)
currentHead currentHeadRetrievalFn // Method to fetch the currently known head of the peer
getRelHeaders relativeHeaderFetcherFn // [eth/62] Method to retrieve a batch of headers from an origin hash
getAbsHeaders absoluteHeaderFetcherFn // [eth/62] Method to retrieve a batch of headers from an absolute position
getBlockBodies blockBodyFetcherFn // [eth/62] Method to retrieve a batch of block bodies
@ -87,14 +92,14 @@ type peer struct {
// newPeer create a new downloader peer, with specific hash and block retrieval
// mechanisms.
func newPeer(id string, version int, head common.Hash,
func newPeer(id string, version int, currentHead currentHeadRetrievalFn,
getRelHeaders relativeHeaderFetcherFn, getAbsHeaders absoluteHeaderFetcherFn, getBlockBodies blockBodyFetcherFn,
getReceipts receiptFetcherFn, getNodeData stateFetcherFn) *peer {
return &peer{
id: id,
head: head,
lacking: make(map[common.Hash]struct{}),
currentHead: currentHead,
getRelHeaders: getRelHeaders,
getAbsHeaders: getAbsHeaders,
getBlockBodies: getBlockBodies,

30
eth/handler.go
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@ -272,11 +272,7 @@ func (pm *ProtocolManager) handle(p *peer) error {
defer pm.removePeer(p.id)
// Register the peer in the downloader. If the downloader considers it banned, we disconnect
err := pm.downloader.RegisterPeer(p.id, p.version, p.Head(),
p.RequestHeadersByHash, p.RequestHeadersByNumber,
p.RequestBodies, p.RequestReceipts, p.RequestNodeData,
)
if err != nil {
if err := pm.downloader.RegisterPeer(p.id, p.version, p.Head, p.RequestHeadersByHash, p.RequestHeadersByNumber, p.RequestBodies, p.RequestReceipts, p.RequestNodeData); err != nil {
return err
}
// Propagate existing transactions. new transactions appearing
@ -413,7 +409,7 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
// If we already have a DAO header, we can check the peer's TD against it. If
// the peer's ahead of this, it too must have a reply to the DAO check
if daoHeader := pm.blockchain.GetHeaderByNumber(pm.chainconfig.DAOForkBlock.Uint64()); daoHeader != nil {
if p.Td().Cmp(pm.blockchain.GetTd(daoHeader.Hash(), daoHeader.Number.Uint64())) >= 0 {
if _, td := p.Head(); td.Cmp(pm.blockchain.GetTd(daoHeader.Hash(), daoHeader.Number.Uint64())) >= 0 {
verifyDAO = false
}
}
@ -619,7 +615,6 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
// Mark the hashes as present at the remote node
for _, block := range announces {
p.MarkBlock(block.Hash)
p.SetHead(block.Hash)
}
// Schedule all the unknown hashes for retrieval
unknown := make([]announce, 0, len(announces))
@ -646,16 +641,23 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
// Mark the peer as owning the block and schedule it for import
p.MarkBlock(request.Block.Hash())
p.SetHead(request.Block.Hash())
pm.fetcher.Enqueue(p.id, request.Block)
// Update the peers total difficulty if needed, schedule a download if gapped
if request.TD.Cmp(p.Td()) > 0 {
p.SetTd(request.TD)
// Assuming the block is importable by the peer, but possibly not yet done so,
// calculate the head hash and TD that the peer truly must have.
var (
trueHead = request.Block.ParentHash()
trueTD = new(big.Int).Sub(request.TD, request.Block.Difficulty())
)
// Update the peers total difficulty if better than the previous
if _, td := p.Head(); trueTD.Cmp(td) > 0 {
p.SetHead(trueHead, trueTD)
// Schedule a sync if above ours. Note, this will not fire a sync for a gap of
// a singe block (as the true TD is below the propagated block), however this
// scenario should easily be covered by the fetcher.
currentBlock := pm.blockchain.CurrentBlock()
td := pm.blockchain.GetTd(currentBlock.Hash(), currentBlock.NumberU64())
if request.TD.Cmp(new(big.Int).Add(td, request.Block.Difficulty())) > 0 {
if trueTD.Cmp(pm.blockchain.GetTd(currentBlock.Hash(), currentBlock.NumberU64())) > 0 {
go pm.synchronise(p)
}
}

34
eth/peer.go
View File

@ -84,43 +84,31 @@ func newPeer(version int, p *p2p.Peer, rw p2p.MsgReadWriter) *peer {
// Info gathers and returns a collection of metadata known about a peer.
func (p *peer) Info() *PeerInfo {
hash, td := p.Head()
return &PeerInfo{
Version: p.version,
Difficulty: p.Td(),
Head: fmt.Sprintf("%x", p.Head()),
Difficulty: td,
Head: hash.Hex(),
}
}
// Head retrieves a copy of the current head (most recent) hash of the peer.
func (p *peer) Head() (hash common.Hash) {
// Head retrieves a copy of the current head hash and total difficulty of the
// peer.
func (p *peer) Head() (hash common.Hash, td *big.Int) {
p.lock.RLock()
defer p.lock.RUnlock()
copy(hash[:], p.head[:])
return hash
return hash, new(big.Int).Set(p.td)
}
// SetHead updates the head (most recent) hash of the peer.
func (p *peer) SetHead(hash common.Hash) {
// SetHead updates the head hash and total difficulty of the peer.
func (p *peer) SetHead(hash common.Hash, td *big.Int) {
p.lock.Lock()
defer p.lock.Unlock()
copy(p.head[:], hash[:])
}
// Td retrieves the current total difficulty of a peer.
func (p *peer) Td() *big.Int {
p.lock.RLock()
defer p.lock.RUnlock()
return new(big.Int).Set(p.td)
}
// SetTd updates the current total difficulty of a peer.
func (p *peer) SetTd(td *big.Int) {
p.lock.Lock()
defer p.lock.Unlock()
p.td.Set(td)
}
@ -411,7 +399,7 @@ func (ps *peerSet) BestPeer() *peer {
bestTd *big.Int
)
for _, p := range ps.peers {
if td := p.Td(); bestPeer == nil || td.Cmp(bestTd) > 0 {
if _, td := p.Head(); bestPeer == nil || td.Cmp(bestTd) > 0 {
bestPeer, bestTd = p, td
}
}

8
eth/sync.go
View File

@ -161,10 +161,12 @@ func (pm *ProtocolManager) synchronise(peer *peer) {
if peer == nil {
return
}
// Make sure the peer's TD is higher than our own. If not drop.
// Make sure the peer's TD is higher than our own
currentBlock := pm.blockchain.CurrentBlock()
td := pm.blockchain.GetTd(currentBlock.Hash(), currentBlock.NumberU64())
if peer.Td().Cmp(td) <= 0 {
pHead, pTd := peer.Head()
if pTd.Cmp(td) <= 0 {
return
}
// Otherwise try to sync with the downloader
@ -172,7 +174,7 @@ func (pm *ProtocolManager) synchronise(peer *peer) {
if atomic.LoadUint32(&pm.fastSync) == 1 {
mode = downloader.FastSync
}
if err := pm.downloader.Synchronise(peer.id, peer.Head(), peer.Td(), mode); err != nil {
if err := pm.downloader.Synchronise(peer.id, pHead, pTd, mode); err != nil {
return
}
atomic.StoreUint32(&pm.synced, 1) // Mark initial sync done