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eth/downloader: fix hash fetch timeout handling

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Fixes #1206
This commit is contained in:
Felix Lange 2015-06-09 13:13:21 +02:00
parent 3239aca69b
commit 8dc3048f65
1 changed files with 18 additions and 12 deletions
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30
eth/downloader/downloader.go
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@ -263,23 +263,29 @@ func (d *Downloader) Cancel() bool {
// XXX Make synchronous
func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
glog.V(logger.Debug).Infof("Downloading hashes (%x) from %s", h[:4], p.id)
start := time.Now()
// Add the hash to the queue first, and start hash retrieval
d.queue.Insert([]common.Hash{h})
p.getHashes(h)
var (
start = time.Now()
active = p // active peer will help determine the current active peer
head = common.Hash{} // common and last hash
timeout = time.NewTimer(hashTTL) // timer to dump a non-responsive active peer
timeout = time.NewTimer(0) // timer to dump a non-responsive active peer
attempted = make(map[string]bool) // attempted peers will help with retries
crossTicker = time.NewTicker(crossCheckCycle) // ticker to periodically check expired cross checks
)
defer crossTicker.Stop()
defer timeout.Stop()
glog.V(logger.Debug).Infof("Downloading hashes (%x) from %s", h[:4], p.id)
<-timeout.C // timeout channel should be initially empty.
getHashes := func(from common.Hash) {
active.getHashes(from)
timeout.Reset(hashTTL)
}
// Add the hash to the queue, and start hash retrieval.
d.queue.Insert([]common.Hash{h})
getHashes(h)
attempted[p.id] = true
for finished := false; !finished; {
@ -293,7 +299,7 @@ func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
glog.V(logger.Debug).Infof("Received hashes from incorrect peer(%s)", hashPack.peerId)
break
}
timeout.Reset(hashTTL)
timeout.Stop()
// Make sure the peer actually gave something valid
if len(hashPack.hashes) == 0 {
@ -345,7 +351,7 @@ func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
active.getBlocks([]common.Hash{origin})
// Also fetch a fresh
active.getHashes(head)
getHashes(head)
continue
}
// We're done, prepare the download cache and proceed pulling the blocks
@ -399,7 +405,7 @@ func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
// set p to the active peer. this will invalidate any hashes that may be returned
// by our previous (delayed) peer.
active = p
p.getHashes(head)
getHashes(head)
glog.V(logger.Debug).Infof("Hash fetching switched to new peer(%s)", p.id)
}
}