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Merge pull request #842 from gzliudan/fix_downloader

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eth/downloader: fix 2 bugs
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Daniel Liu 2025-02-11 18:30:40 +08:00 committed by GitHub
commit 47543e8b1c
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1 changed files with 18 additions and 11 deletions
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29
eth/downloader/downloader.go
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@ -140,9 +140,10 @@ type Downloader struct {
stateCh chan dataPack // [eth/63] Channel receiving inbound node state data stateCh chan dataPack // [eth/63] Channel receiving inbound node state data
// Cancellation and termination // Cancellation and termination
cancelPeer string // Identifier of the peer currently being used as the master (cancel on drop) cancelPeer string // Identifier of the peer currently being used as the master (cancel on drop)
cancelCh chan struct{} // Channel to cancel mid-flight syncs cancelCh chan struct{} // Channel to cancel mid-flight syncs
cancelLock sync.RWMutex // Lock to protect the cancel channel and peer in delivers cancelLock sync.RWMutex // Lock to protect the cancel channel and peer in delivers
cancelWg sync.WaitGroup // Make sure all fetcher goroutines have exited.
quitCh chan struct{} // Quit channel to signal termination quitCh chan struct{} // Quit channel to signal termination
quitLock sync.Mutex // Lock to prevent double closes quitLock sync.Mutex // Lock to prevent double closes
@ -312,7 +313,7 @@ func (d *Downloader) UnregisterPeer(id string) error {
d.cancelLock.RUnlock() d.cancelLock.RUnlock()
if master { if master {
d.Cancel() d.cancel()
} }
return nil return nil
} }
@ -483,12 +484,11 @@ func (d *Downloader) syncWithPeer(p *peerConnection, hash common.Hash, td *big.I
// spawnSync runs d.process and all given fetcher functions to completion in // spawnSync runs d.process and all given fetcher functions to completion in
// separate goroutines, returning the first error that appears. // separate goroutines, returning the first error that appears.
func (d *Downloader) spawnSync(fetchers []func() error) error { func (d *Downloader) spawnSync(fetchers []func() error) error {
var wg sync.WaitGroup
errc := make(chan error, len(fetchers)) errc := make(chan error, len(fetchers))
wg.Add(len(fetchers)) d.cancelWg.Add(len(fetchers))
for _, fn := range fetchers { for _, fn := range fetchers {
fn := fn fn := fn
go func() { defer wg.Done(); errc <- fn() }() go func() { defer d.cancelWg.Done(); errc <- fn() }()
} }
// Wait for the first error, then terminate the others. // Wait for the first error, then terminate the others.
var err error var err error
@ -505,16 +505,16 @@ func (d *Downloader) spawnSync(fetchers []func() error) error {
} }
d.queue.Close() d.queue.Close()
d.Cancel() d.Cancel()
wg.Wait()
if err == errEnoughBlock { if err == errEnoughBlock {
return nil return nil
} }
return err return err
} }
// Cancel cancels all of the operations and resets the queue. It returns true // cancel aborts all of the operations and resets the queue. However, cancel does
// if the cancel operation was completed. // not wait for the running download goroutines to finish. This method should be
func (d *Downloader) Cancel() { // used when cancelling the downloads from inside the downloader.
func (d *Downloader) cancel() {
// Close the current cancel channel // Close the current cancel channel
d.cancelLock.Lock() d.cancelLock.Lock()
if d.cancelCh != nil { if d.cancelCh != nil {
@ -528,6 +528,13 @@ func (d *Downloader) Cancel() {
d.cancelLock.Unlock() d.cancelLock.Unlock()
} }
// Cancel aborts all of the operations and waits for all download goroutines to
// finish before returning.
func (d *Downloader) Cancel() {
d.cancel()
d.cancelWg.Wait()
}
// Terminate interrupts the downloader, canceling all pending operations. // Terminate interrupts the downloader, canceling all pending operations.
// The downloader cannot be reused after calling Terminate. // The downloader cannot be reused after calling Terminate.
func (d *Downloader) Terminate() { func (d *Downloader) Terminate() {