netsync/consensusmgr/block_fetcher.go

   1 package consensusmgr
   2
   3 import (
   4         "github.com/sirupsen/logrus"
   5         "gopkg.in/karalabe/cookiejar.v2/collections/prque"
   6
   7         "github.com/vapor/netsync/peers"
   8         "github.com/vapor/protocol/bc"
   9 )
  10
  11 const (
  12         maxBlockDistance = 64
  13         maxMsgSetSize    = 128
  14         newBlockChSize   = 64
  15 )
  16
  17 // blockFetcher is responsible for accumulating block announcements from various peers
  18 // and scheduling them for retrieval.
  19 type blockFetcher struct {
  20         chain Chain
  21         peers *peers.PeerSet
  22
  23         newBlockCh chan *blockMsg
  24         queue      *prque.Prque
  25         msgSet     map[bc.Hash]*blockMsg
  26 }
  27
  28 //NewBlockFetcher creates a block fetcher to retrieve blocks of the new propose.
  29 func newBlockFetcher(chain Chain, peers *peers.PeerSet) *blockFetcher {
  30         f := &blockFetcher{
  31                 chain:      chain,
  32                 peers:      peers,
  33                 newBlockCh: make(chan *blockMsg, newBlockChSize),
  34                 queue:      prque.New(),
  35                 msgSet:     make(map[bc.Hash]*blockMsg),
  36         }
  37         go f.blockProcessor()
  38         return f
  39 }
  40
  41 func (f *blockFetcher) blockProcessor() {
  42         for {
  43                 for !f.queue.Empty() {
  44                         msg := f.queue.PopItem().(*blockMsg)
  45                         if msg.block.Height > f.chain.BestBlockHeight()+1 {
  46                                 f.queue.Push(msg, -float32(msg.block.Height))
  47                                 break
  48                         }
  49
  50                         f.insert(msg)
  51                         delete(f.msgSet, msg.block.Hash())
  52                 }
  53                 f.add(<-f.newBlockCh)
  54         }
  55 }
  56
  57 func (f *blockFetcher) add(msg *blockMsg) {
  58         bestHeight := f.chain.BestBlockHeight()
  59         if len(f.msgSet) > maxMsgSetSize || bestHeight > msg.block.Height || msg.block.Height-bestHeight > maxBlockDistance {
  60                 return
  61         }
  62
  63         blockHash := msg.block.Hash()
  64         if _, ok := f.msgSet[blockHash]; !ok {
  65                 f.msgSet[blockHash] = msg
  66                 f.queue.Push(msg, -float32(msg.block.Height))
  67                 logrus.WithFields(logrus.Fields{
  68                         "module":       logModule,
  69                         "block height": msg.block.Height,
  70                         "block hash":   blockHash.String(),
  71                 }).Debug("blockFetcher receive propose block")
  72         }
  73 }
  74
  75 func (f *blockFetcher) insert(msg *blockMsg) {
  76         isOrphan, err := f.chain.ProcessBlock(msg.block)
  77         if err != nil {
  78                 peer := f.peers.GetPeer(msg.peerID)
  79                 if peer == nil {
  80                         return
  81                 }
  82
  83                 f.peers.AddBanScore(msg.peerID, 20, 0, err.Error())
  84                 return
  85         }
  86
  87         if isOrphan {
  88                 return
  89         }
  90
  91         hash := msg.block.Hash()
  92         f.peers.SetStatus(msg.peerID, msg.block.Height, &hash)
  93         proposeMsg, err := NewBlockProposeMsg(msg.block)
  94         if err != nil {
  95                 logrus.WithFields(logrus.Fields{"module": logModule, "err": err}).Error("failed on create BlockProposeMsg")
  96                 return
  97         }
  98
  99         if err := f.peers.BroadcastMsg(NewBroadcastMsg(proposeMsg, consensusChannel)); err != nil {
 100                 logrus.WithFields(logrus.Fields{"module": logModule, "err": err}).Error("failed on broadcast proposed block")
 101                 return
 102         }
 103 }
 104
 105 func (f *blockFetcher) processNewBlock(msg *blockMsg) {
 106         f.newBlockCh <- msg
 107 }