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Merge pull request #1843 from karalabe/cleanup-downloader-channel

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eth/downloader: always send termination wakes, clean leftover
This commit is contained in:
Jeffrey Wilcke 2015-09-25 04:34:59 -07:00
commit 7977e87ce1
1 changed files with 36 additions and 20 deletions
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56
eth/downloader/downloader.go
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@ -154,7 +154,7 @@ type Downloader struct {
blockCh chan blockPack // [eth/61] Channel receiving inbound blocks
headerCh chan headerPack // [eth/62] Channel receiving inbound block headers
bodyCh chan bodyPack // [eth/62] Channel receiving inbound block bodies
processCh chan bool // Channel to signal the block fetcher of new or finished work
wakeCh chan bool // Channel to signal the block/body fetcher of new tasks
cancelCh chan struct{} // Channel to cancel mid-flight syncs
cancelLock sync.RWMutex // Lock to protect the cancel channel in delivers
@ -188,7 +188,7 @@ func New(mux *event.TypeMux, hasBlock hashCheckFn, getBlock blockRetrievalFn, he
blockCh: make(chan blockPack, 1),
headerCh: make(chan headerPack, 1),
bodyCh: make(chan bodyPack, 1),
processCh: make(chan bool, 1),
wakeCh: make(chan bool, 1),
}
}
@ -282,6 +282,10 @@ func (d *Downloader) synchronise(id string, hash common.Hash, td *big.Int) error
d.queue.Reset()
d.peers.Reset()
select {
case <-d.wakeCh:
default:
}
// Create cancel channel for aborting mid-flight
d.cancelLock.Lock()
d.cancelCh = make(chan struct{})
@ -633,7 +637,7 @@ func (d *Downloader) fetchHashes61(p *peer, td *big.Int, from uint64) error {
glog.V(logger.Debug).Infof("%v: no available hashes", p)
select {
case d.processCh <- false:
case d.wakeCh <- false:
case <-d.cancelCh:
}
// If no hashes were retrieved at all, the peer violated it's TD promise that it had a
@ -664,12 +668,18 @@ func (d *Downloader) fetchHashes61(p *peer, td *big.Int, from uint64) error {
return errBadPeer
}
// Notify the block fetcher of new hashes, but stop if queue is full
cont := d.queue.Pending() < maxQueuedHashes
select {
case d.processCh <- cont:
default:
}
if !cont {
if d.queue.Pending() < maxQueuedHashes {
// We still have hashes to fetch, send continuation wake signal (potential)
select {
case d.wakeCh <- true:
default:
}
} else {
// Hash limit reached, send a termination wake signal (enforced)
select {
case d.wakeCh <- false:
case <-d.cancelCh:
}
return nil
}
// Queue not yet full, fetch the next batch
@ -766,7 +776,7 @@ func (d *Downloader) fetchBlocks61(from uint64) error {
default:
}
case cont := <-d.processCh:
case cont := <-d.wakeCh:
// The hash fetcher sent a continuation flag, check if it's done
if !cont {
finished = true
@ -1053,7 +1063,7 @@ func (d *Downloader) fetchHeaders(p *peer, td *big.Int, from uint64) error {
glog.V(logger.Debug).Infof("%v: no available headers", p)
select {
case d.processCh <- false:
case d.wakeCh <- false:
case <-d.cancelCh:
}
// If no headers were retrieved at all, the peer violated it's TD promise that it had a
@ -1084,12 +1094,18 @@ func (d *Downloader) fetchHeaders(p *peer, td *big.Int, from uint64) error {
return errBadPeer
}
// Notify the block fetcher of new headers, but stop if queue is full
cont := d.queue.Pending() < maxQueuedHeaders
select {
case d.processCh <- cont:
default:
}
if !cont {
if d.queue.Pending() < maxQueuedHeaders {
// We still have headers to fetch, send continuation wake signal (potential)
select {
case d.wakeCh <- true:
default:
}
} else {
// Header limit reached, send a termination wake signal (enforced)
select {
case d.wakeCh <- false:
case <-d.cancelCh:
}
return nil
}
// Queue not yet full, fetch the next batch
@ -1104,8 +1120,8 @@ func (d *Downloader) fetchHeaders(p *peer, td *big.Int, from uint64) error {
// Finish the sync gracefully instead of dumping the gathered data though
select {
case d.processCh <- false:
default:
case d.wakeCh <- false:
case <-d.cancelCh:
}
return nil
}
@ -1199,7 +1215,7 @@ func (d *Downloader) fetchBodies(from uint64) error {
default:
}
case cont := <-d.processCh:
case cont := <-d.wakeCh:
// The header fetcher sent a continuation flag, check if it's done
if !cont {
finished = true