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eth/downloader: fix #1178, don't request blocks beyond the cache bounds

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This commit is contained in:
Péter Szilágyi
2015-06-04 14:51:14 +03:00
parent 8610314918
commit 28c32d1b1b
3 changed files with 35 additions and 15 deletions
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38
eth/downloader/downloader.go
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@ -281,19 +281,19 @@ func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
case hashPack := <-d.hashCh:
// Make sure the active peer is giving us the hashes
if hashPack.peerId != active.id {
glog.V(logger.Debug).Infof("Received hashes from incorrect peer(%s)\n", hashPack.peerId)
glog.V(logger.Debug).Infof("Received hashes from incorrect peer(%s)", hashPack.peerId)
break
}
timeout.Reset(hashTTL)
// Make sure the peer actually gave something valid
if len(hashPack.hashes) == 0 {
glog.V(logger.Debug).Infof("Peer (%s) responded with empty hash set\n", active.id)
glog.V(logger.Debug).Infof("Peer (%s) responded with empty hash set", active.id)
return errEmptyHashSet
}
for _, hash := range hashPack.hashes {
if d.banned.Has(hash) {
glog.V(logger.Debug).Infof("Peer (%s) sent a known invalid chain\n", active.id)
glog.V(logger.Debug).Infof("Peer (%s) sent a known invalid chain", active.id)
return ErrInvalidChain
}
}
@ -301,7 +301,7 @@ func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
done, index := false, 0
for index, head = range hashPack.hashes {
if d.hasBlock(head) || d.queue.GetBlock(head) != nil {
glog.V(logger.Debug).Infof("Found common hash %x\n", head[:4])
glog.V(logger.Debug).Infof("Found common hash %x", head[:4])
hashPack.hashes = hashPack.hashes[:index]
done = true
break
@ -310,7 +310,7 @@ func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
// Insert all the new hashes, but only continue if got something useful
inserts := d.queue.Insert(hashPack.hashes)
if len(inserts) == 0 && !done {
glog.V(logger.Debug).Infof("Peer (%s) responded with stale hashes\n", active.id)
glog.V(logger.Debug).Infof("Peer (%s) responded with stale hashes", active.id)
return ErrBadPeer
}
if !done {
@ -365,7 +365,7 @@ func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
}
case <-timeout.C:
glog.V(logger.Debug).Infof("Peer (%s) didn't respond in time for hash request\n", p.id)
glog.V(logger.Debug).Infof("Peer (%s) didn't respond in time for hash request", p.id)
var p *peer // p will be set if a peer can be found
// Attempt to find a new peer by checking inclusion of peers best hash in our
@ -386,10 +386,10 @@ func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
// by our previous (delayed) peer.
active = p
p.getHashes(head)
glog.V(logger.Debug).Infof("Hash fetching switched to new peer(%s)\n", p.id)
glog.V(logger.Debug).Infof("Hash fetching switched to new peer(%s)", p.id)
}
}
glog.V(logger.Debug).Infof("Downloaded hashes (%d) in %v\n", d.queue.Pending(), time.Since(start))
glog.V(logger.Debug).Infof("Downloaded hashes (%d) in %v", d.queue.Pending(), time.Since(start))
return nil
}
@ -421,22 +421,29 @@ out:
// If the peer was previously banned and failed to deliver it's pack
// in a reasonable time frame, ignore it's message.
if peer := d.peers.Peer(blockPack.peerId); peer != nil {
// Deliver the received chunk of blocks
// Deliver the received chunk of blocks, and demote in case of errors
if err := d.queue.Deliver(blockPack.peerId, blockPack.blocks); err != nil {
if err == ErrInvalidChain {
// The hash chain is invalid (blocks are not ordered properly), abort
return err
}
// Peer did deliver, but some blocks were off, penalize
glog.V(logger.Debug).Infof("Failed delivery for peer %s: %v\n", blockPack.peerId, err)
glog.V(logger.Detail).Infof("%s: block delivery failed: %v", peer, err)
peer.Demote()
peer.SetIdle()
break
}
if glog.V(logger.Debug) && len(blockPack.blocks) > 0 {
glog.Infof("Added %d blocks from: %s\n", len(blockPack.blocks), blockPack.peerId)
// If no blocks were delivered, demote the peer (above code is needed to mark the packet done!)
if len(blockPack.blocks) == 0 {
glog.V(logger.Detail).Infof("%s: no blocks delivered", peer)
peer.Demote()
peer.SetIdle()
break
}
// All was successful, promote the peer
if glog.V(logger.Detail) && len(blockPack.blocks) > 0 {
glog.Infof("%s: delivered %d blocks", peer, len(blockPack.blocks))
}
// Promote the peer and update it's idle state
peer.Promote()
peer.SetIdle()
}
@ -481,11 +488,14 @@ out:
if request == nil {
continue
}
if glog.V(logger.Detail) {
glog.Infof("%s: requesting %d blocks", peer, len(request.Hashes))
}
// Fetch the chunk and check for error. If the peer was somehow
// already fetching a chunk due to a bug, it will be returned to
// the queue
if err := peer.Fetch(request); err != nil {
glog.V(logger.Error).Infof("Peer %s received double work\n", peer.id)
glog.V(logger.Error).Infof("Peer %s received double work", peer.id)
d.queue.Cancel(request)
}
}