/
msg_fetcher.go
359 lines (310 loc) · 9.94 KB
/
msg_fetcher.go
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package chainmgr
import (
"sync"
"time"
log "github.com/sirupsen/logrus"
"github.com/bytom/vapor/errors"
"github.com/bytom/vapor/netsync/peers"
"github.com/bytom/vapor/p2p/security"
"github.com/bytom/vapor/protocol/bc"
"github.com/bytom/vapor/protocol/bc/types"
)
const (
maxNumOfParallelFetchBlocks = 7
blockProcessChSize = 1024
blocksProcessChSize = 128
headersProcessChSize = 1024
maxNumOfFastSyncPeers = 128
)
var (
requireBlockTimeout = 20 * time.Second
requireHeadersTimeout = 30 * time.Second
requireBlocksTimeout = 90 * time.Second
checkSyncPeerNumInterval = 5 * time.Second
errRequestBlocksTimeout = errors.New("request blocks timeout")
errRequestTimeout = errors.New("request timeout")
errPeerDropped = errors.New("Peer dropped")
errSendMsg = errors.New("send message error")
)
// MsgFetcher is the interface for msg fetch struct
type MsgFetcher interface {
resetParameter()
addSyncPeer(peerID string)
requireBlock(peerID string, height uint64) (*types.Block, error)
parallelFetchBlocks(work []*fetchBlocksWork, downloadNotifyCh chan struct{}, ProcessStopCh chan struct{}, wg *sync.WaitGroup)
parallelFetchHeaders(peers []*peers.Peer, locator []*bc.Hash, stopHash *bc.Hash, skip uint64) map[string][]*types.BlockHeader
}
type fetchBlocksWork struct {
startHeader, stopHeader *types.BlockHeader
}
type fetchBlocksResult struct {
startHeight, stopHeight uint64
err error
}
type msgFetcher struct {
storage *storage
syncPeers *fastSyncPeers
peers *peers.PeerSet
blockProcessCh chan *blockMsg
blocksProcessCh chan *blocksMsg
headersProcessCh chan *headersMsg
blocksMsgChanMap map[string]chan []*types.Block
mux sync.RWMutex
}
func newMsgFetcher(storage *storage, peers *peers.PeerSet) *msgFetcher {
return &msgFetcher{
storage: storage,
syncPeers: newFastSyncPeers(),
peers: peers,
blockProcessCh: make(chan *blockMsg, blockProcessChSize),
blocksProcessCh: make(chan *blocksMsg, blocksProcessChSize),
headersProcessCh: make(chan *headersMsg, headersProcessChSize),
blocksMsgChanMap: make(map[string]chan []*types.Block),
}
}
func (mf *msgFetcher) addSyncPeer(peerID string) {
mf.syncPeers.add(peerID)
}
func (mf *msgFetcher) collectResultLoop(peerCh chan string, quit chan struct{}, resultCh chan *fetchBlocksResult, workerCloseCh chan struct{}, workSize int) {
defer close(workerCloseCh)
ticker := time.NewTicker(checkSyncPeerNumInterval)
defer ticker.Stop()
//collect fetch results
for resultCount := 0; resultCount < workSize && mf.syncPeers.size() > 0; {
select {
case result := <-resultCh:
resultCount++
if result.err != nil {
log.WithFields(log.Fields{"module": logModule, "startHeight": result.startHeight, "stopHeight": result.stopHeight, "err": result.err}).Error("failed on fetch blocks")
return
}
peer, err := mf.syncPeers.selectIdlePeer()
if err != nil {
log.WithFields(log.Fields{"module": logModule, "err": result.err}).Warn("failed on find fast sync peer")
break
}
peerCh <- peer
case <-ticker.C:
if mf.syncPeers.size() == 0 {
log.WithFields(log.Fields{"module": logModule}).Warn("num of fast sync peer is 0")
return
}
case _, ok := <-quit:
if !ok {
return
}
}
}
}
func (mf *msgFetcher) fetchBlocks(work *fetchBlocksWork, peerID string) ([]*types.Block, error) {
defer mf.syncPeers.setIdle(peerID)
startHash := work.startHeader.Hash()
stopHash := work.stopHeader.Hash()
blocks, err := mf.requireBlocks(peerID, []*bc.Hash{&startHash}, &stopHash)
if err != nil {
mf.syncPeers.delete(peerID)
mf.peers.ProcessIllegal(peerID, security.LevelConnException, err.Error())
return nil, err
}
if err := mf.verifyBlocksMsg(blocks, work.startHeader, work.stopHeader); err != nil {
mf.syncPeers.delete(peerID)
mf.peers.ProcessIllegal(peerID, security.LevelConnException, err.Error())
return nil, err
}
return blocks, nil
}
func (mf *msgFetcher) fetchBlocksProcess(work *fetchBlocksWork, peerCh chan string, downloadNotifyCh chan struct{}, closeCh chan struct{}) error {
for {
select {
case peerID := <-peerCh:
for {
blocks, err := mf.fetchBlocks(work, peerID)
if err != nil {
log.WithFields(log.Fields{"module": logModule, "startHeight": work.startHeader.Height, "stopHeight": work.stopHeader.Height, "error": err}).Info("failed on fetch blocks")
break
}
if err := mf.storage.writeBlocks(peerID, blocks); err != nil {
log.WithFields(log.Fields{"module": logModule, "error": err}).Info("write block error")
return err
}
// send to block process pool
select {
case downloadNotifyCh <- struct{}{}:
default:
}
// work completed
if blocks[len(blocks)-1].Height >= work.stopHeader.Height-1 {
return nil
}
//unfinished work, continue
work.startHeader = &blocks[len(blocks)-1].BlockHeader
}
case <-closeCh:
return nil
}
}
}
func (mf *msgFetcher) fetchBlocksWorker(workCh chan *fetchBlocksWork, peerCh chan string, resultCh chan *fetchBlocksResult, closeCh chan struct{}, downloadNotifyCh chan struct{}, wg *sync.WaitGroup) {
for {
select {
case work := <-workCh:
err := mf.fetchBlocksProcess(work, peerCh, downloadNotifyCh, closeCh)
resultCh <- &fetchBlocksResult{startHeight: work.startHeader.Height, stopHeight: work.stopHeader.Height, err: err}
case <-closeCh:
wg.Done()
return
}
}
}
func (mf *msgFetcher) parallelFetchBlocks(works []*fetchBlocksWork, downloadNotifyCh chan struct{}, ProcessStopCh chan struct{}, wg *sync.WaitGroup) {
workSize := len(works)
workCh := make(chan *fetchBlocksWork, workSize)
peerCh := make(chan string, maxNumOfFastSyncPeers)
resultCh := make(chan *fetchBlocksResult, workSize)
closeCh := make(chan struct{})
for _, work := range works {
workCh <- work
}
syncPeers := mf.syncPeers.selectIdlePeers()
for i := 0; i < len(syncPeers) && i < maxNumOfFastSyncPeers; i++ {
peerCh <- syncPeers[i]
}
var workWg sync.WaitGroup
for i := 0; i <= maxNumOfParallelFetchBlocks && i < workSize; i++ {
workWg.Add(1)
go mf.fetchBlocksWorker(workCh, peerCh, resultCh, closeCh, downloadNotifyCh, &workWg)
}
go mf.collectResultLoop(peerCh, ProcessStopCh, resultCh, closeCh, workSize)
workWg.Wait()
close(resultCh)
close(peerCh)
close(workCh)
close(downloadNotifyCh)
wg.Done()
}
func (mf *msgFetcher) parallelFetchHeaders(peers []*peers.Peer, locator []*bc.Hash, stopHash *bc.Hash, skip uint64) map[string][]*types.BlockHeader {
result := make(map[string][]*types.BlockHeader)
response := make(map[string]bool)
for _, peer := range peers {
if ok := peer.GetHeaders(locator, stopHash, skip); !ok {
continue
}
result[peer.ID()] = nil
}
timeout := time.NewTimer(requireHeadersTimeout)
defer timeout.Stop()
for {
select {
case msg := <-mf.headersProcessCh:
if _, ok := result[msg.peerID]; ok {
result[msg.peerID] = append(result[msg.peerID], msg.headers[:]...)
response[msg.peerID] = true
if len(response) == len(result) {
return result
}
}
case <-timeout.C:
log.WithFields(log.Fields{"module": logModule, "err": errRequestTimeout}).Warn("failed on parallel fetch headers")
return result
}
}
}
func (mf *msgFetcher) processBlock(peerID string, block *types.Block) {
mf.blockProcessCh <- &blockMsg{block: block, peerID: peerID}
}
func (mf *msgFetcher) processBlocks(peerID string, blocks []*types.Block) {
mf.blocksProcessCh <- &blocksMsg{blocks: blocks, peerID: peerID}
mf.mux.RLock()
blocksMsgChan, ok := mf.blocksMsgChanMap[peerID]
mf.mux.RUnlock()
if !ok {
mf.peers.ProcessIllegal(peerID, security.LevelMsgIllegal, "msg from unsolicited peer")
return
}
blocksMsgChan <- blocks
}
func (mf *msgFetcher) processHeaders(peerID string, headers []*types.BlockHeader) {
mf.headersProcessCh <- &headersMsg{headers: headers, peerID: peerID}
}
func (mf *msgFetcher) requireBlock(peerID string, height uint64) (*types.Block, error) {
peer := mf.peers.GetPeer(peerID)
if peer == nil {
return nil, errPeerDropped
}
if ok := peer.GetBlockByHeight(height); !ok {
return nil, errSendMsg
}
timeout := time.NewTimer(requireBlockTimeout)
defer timeout.Stop()
for {
select {
case msg := <-mf.blockProcessCh:
if msg.peerID != peerID {
continue
}
if msg.block.Height != height {
continue
}
return msg.block, nil
case <-timeout.C:
return nil, errors.Wrap(errRequestTimeout, "requireBlock")
}
}
}
func (mf *msgFetcher) requireBlocks(peerID string, locator []*bc.Hash, stopHash *bc.Hash) ([]*types.Block, error) {
peer := mf.peers.GetPeer(peerID)
if peer == nil {
mf.syncPeers.delete(peerID)
return nil, errPeerDropped
}
receiveCh := make(chan []*types.Block, 1)
mf.mux.Lock()
mf.blocksMsgChanMap[peerID] = receiveCh
mf.mux.Unlock()
if ok := peer.GetBlocks(locator, stopHash); !ok {
return nil, errSendMsg
}
timeout := time.NewTimer(requireBlocksTimeout)
defer timeout.Stop()
select {
case blocks := <-receiveCh:
return blocks, nil
case <-timeout.C:
return nil, errRequestBlocksTimeout
}
}
func (mf *msgFetcher) resetParameter() {
mf.blocksMsgChanMap = make(map[string]chan []*types.Block)
mf.syncPeers = newFastSyncPeers()
mf.storage.resetParameter()
//empty chan
for {
select {
case <-mf.blocksProcessCh:
case <-mf.headersProcessCh:
default:
return
}
}
}
func (mf *msgFetcher) verifyBlocksMsg(blocks []*types.Block, startHeader, stopHeader *types.BlockHeader) error {
// null blocks
if len(blocks) == 0 {
return errors.New("null blocks msg")
}
// blocks more than request
if uint64(len(blocks)) > stopHeader.Height-startHeader.Height+1 {
return errors.New("exceed length blocks msg")
}
// verify start block
if blocks[0].Hash() != startHeader.Hash() {
return errors.New("get mismatch blocks msg")
}
// verify blocks continuity
for i := 0; i < len(blocks)-1; i++ {
if blocks[i].Hash() != blocks[i+1].PreviousBlockHash {
return errors.New("get discontinuous blocks msg")
}
}
return nil
}