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Merge pull request #950 from karalabe/downloader-cancel-sync

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eth/downloader: fix deliveries to check for sync cancels
This commit is contained in:
Jeffrey Wilcke 2015-05-14 04:05:13 -07:00
commit 2b06fe3eff
1 changed files with 37 additions and 32 deletions
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65
eth/downloader/downloader.go
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@ -65,12 +65,15 @@ type Downloader struct {
// Status
synchronising int32
notified int32
// Channels
newPeerCh chan *peer
hashCh chan hashPack
blockCh chan blockPack
cancelCh chan struct{}
cancelCh chan struct{} // Channel to cancel mid-flight syncs
cancelLock sync.RWMutex // Lock to protect the cancel channel in delivers
}
func New(hasBlock hashCheckFn, getBlock getBlockFn) *Downloader {
@ -83,7 +86,6 @@ func New(hasBlock hashCheckFn, getBlock getBlockFn) *Downloader {
hashCh: make(chan hashPack, 1),
blockCh: make(chan blockPack, 1),
}
return downloader
}
@ -123,8 +125,14 @@ func (d *Downloader) Synchronise(id string, hash common.Hash) error {
}
defer atomic.StoreInt32(&d.synchronising, 0)
// Create cancel channel for aborting midflight
// Post a user notification of the sync (only once per session)
if atomic.CompareAndSwapInt32(&d.notified, 0, 1) {
glog.V(logger.Info).Infoln("Block synchronisation started")
}
// Create cancel channel for aborting mid-flight
d.cancelLock.Lock()
d.cancelCh = make(chan struct{})
d.cancelLock.Unlock()
// Abort if the queue still contains some leftover data
if _, cached := d.queue.Size(); cached > 0 && d.queue.GetHeadBlock() != nil {
@ -183,32 +191,15 @@ func (d *Downloader) syncWithPeer(p *peer, hash common.Hash) (err error) {
// Cancel cancels all of the operations and resets the queue. It returns true
// if the cancel operation was completed.
func (d *Downloader) Cancel() bool {
hs, bs := d.queue.Size()
// If we're not syncing just return.
hs, bs := d.queue.Size()
if atomic.LoadInt32(&d.synchronising) == 0 && hs == 0 && bs == 0 {
return false
}
// Close the current cancel channel
d.cancelLock.RLock()
close(d.cancelCh)
// clean up
hashDone:
for {
select {
case <-d.hashCh:
default:
break hashDone
}
}
blockDone:
for {
select {
case <-d.blockCh:
default:
break blockDone
}
}
d.cancelLock.RUnlock()
// reset the queue
d.queue.Reset()
@ -421,9 +412,18 @@ func (d *Downloader) DeliverBlocks(id string, blocks []*types.Block) error {
if atomic.LoadInt32(&d.synchronising) == 0 {
return errNoSyncActive
}
d.blockCh <- blockPack{id, blocks}
// Deliver or abort if the sync is canceled while queuing
d.cancelLock.RLock()
cancel := d.cancelCh
d.cancelLock.RUnlock()
select {
case d.blockCh <- blockPack{id, blocks}:
return nil
case <-cancel:
return errNoSyncActive
}
}
// DeliverHashes injects a new batch of hashes received from a remote node into
@ -434,11 +434,16 @@ func (d *Downloader) DeliverHashes(id string, hashes []common.Hash) error {
if atomic.LoadInt32(&d.synchronising) == 0 {
return errNoSyncActive
}
if glog.V(logger.Debug) && len(hashes) != 0 {
from, to := hashes[0], hashes[len(hashes)-1]
glog.V(logger.Debug).Infof("adding %d (T=%d) hashes [ %x / %x ] from: %s\n", len(hashes), d.queue.Pending(), from[:4], to[:4], id)
}
d.hashCh <- hashPack{id, hashes}
// Deliver or abort if the sync is canceled while queuing
d.cancelLock.RLock()
cancel := d.cancelCh
d.cancelLock.RUnlock()
select {
case d.hashCh <- hashPack{id, hashes}:
return nil
case <-cancel:
return errNoSyncActive
}
}