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-rw-r--r--eth/downloader/downloader.go162
-rw-r--r--eth/downloader/downloader_test.go106
-rw-r--r--eth/downloader/queue.go198
3 files changed, 230 insertions, 236 deletions
diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go
index 153427ee4..ac324176d 100644
--- a/eth/downloader/downloader.go
+++ b/eth/downloader/downloader.go
@@ -74,7 +74,6 @@ var (
errBadPeer = errors.New("action from bad peer ignored")
errStallingPeer = errors.New("peer is stalling")
errNoPeers = errors.New("no peers to keep download active")
- errPendingQueue = errors.New("pending items in queue")
errTimeout = errors.New("timeout")
errEmptyHashSet = errors.New("empty hash set by peer")
errEmptyHeaderSet = errors.New("empty header set by peer")
@@ -90,6 +89,7 @@ var (
errCancelBodyFetch = errors.New("block body download canceled (requested)")
errCancelReceiptFetch = errors.New("receipt download canceled (requested)")
errCancelStateFetch = errors.New("state data download canceled (requested)")
+ errCancelProcessing = errors.New("processing canceled (requested)")
errNoSyncActive = errors.New("no sync active")
)
@@ -129,7 +129,6 @@ type Downloader struct {
// Status
synchroniseMock func(id string, hash common.Hash) error // Replacement for synchronise during testing
synchronising int32
- processing int32
notified int32
// Channels
@@ -215,7 +214,7 @@ func (d *Downloader) Progress() (uint64, uint64, uint64) {
// Synchronising returns whether the downloader is currently retrieving blocks.
func (d *Downloader) Synchronising() bool {
- return atomic.LoadInt32(&d.synchronising) > 0 || atomic.LoadInt32(&d.processing) > 0
+ return atomic.LoadInt32(&d.synchronising) > 0
}
// RegisterPeer injects a new download peer into the set of block source to be
@@ -263,9 +262,6 @@ func (d *Downloader) Synchronise(id string, head common.Hash, td *big.Int, mode
glog.V(logger.Debug).Infof("Removing peer %v: %v", id, err)
d.dropPeer(id)
- case errPendingQueue:
- glog.V(logger.Debug).Infoln("Synchronisation aborted:", err)
-
default:
glog.V(logger.Warn).Infof("Synchronisation failed: %v", err)
}
@@ -290,10 +286,6 @@ func (d *Downloader) synchronise(id string, hash common.Hash, td *big.Int, mode
if atomic.CompareAndSwapInt32(&d.notified, 0, 1) {
glog.V(logger.Info).Infoln("Block synchronisation started")
}
- // Abort if the queue still contains some leftover data
- if d.queue.GetHeadResult() != nil {
- return errPendingQueue
- }
// Reset the queue, peer set and wake channels to clean any internal leftover state
d.queue.Reset()
d.peers.Reset()
@@ -335,7 +327,6 @@ func (d *Downloader) syncWithPeer(p *peer, hash common.Hash, td *big.Int) (err e
defer func() {
// reset on error
if err != nil {
- d.cancel()
d.mux.Post(FailedEvent{err})
} else {
d.mux.Post(DoneEvent{})
@@ -365,23 +356,15 @@ func (d *Downloader) syncWithPeer(p *peer, hash common.Hash, td *big.Int) (err e
d.syncStatsChainHeight = latest
d.syncStatsLock.Unlock()
- // Initiate the sync using a concurrent hash and block retrieval algorithm
+ // Initiate the sync using a concurrent hash and block retrieval algorithm
+ d.queue.Prepare(origin+1, d.mode, 0)
if d.syncInitHook != nil {
d.syncInitHook(origin, latest)
}
- d.queue.Prepare(origin+1, d.mode, 0)
-
- errc := make(chan error, 2)
- go func() { errc <- d.fetchHashes61(p, td, origin+1) }()
- go func() { errc <- d.fetchBlocks61(origin + 1) }()
-
- // If any fetcher fails, cancel the other
- if err := <-errc; err != nil {
- d.cancel()
- <-errc
- return err
- }
- return <-errc
+ return d.spawnSync(
+ func() error { return d.fetchHashes61(p, td, origin+1) },
+ func() error { return d.fetchBlocks61(origin + 1) },
+ )
case p.version >= 62:
// Look up the sync boundaries: the common ancestor and the target block
@@ -405,7 +388,6 @@ func (d *Downloader) syncWithPeer(p *peer, hash common.Hash, td *big.Int) (err e
switch d.mode {
case LightSync:
pivot = latest
-
case FastSync:
// Calculate the new fast/slow sync pivot point
pivotOffset, err := rand.Int(rand.Reader, big.NewInt(int64(fsPivotInterval)))
@@ -426,34 +408,51 @@ func (d *Downloader) syncWithPeer(p *peer, hash common.Hash, td *big.Int) (err e
glog.V(logger.Debug).Infof("Fast syncing until pivot block #%d", pivot)
}
d.queue.Prepare(origin+1, d.mode, pivot)
-
if d.syncInitHook != nil {
d.syncInitHook(origin, latest)
}
- errc := make(chan error, 4)
- go func() { errc <- d.fetchHeaders(p, td, origin+1) }() // Headers are always retrieved
- go func() { errc <- d.fetchBodies(origin + 1) }() // Bodies are retrieved during normal and fast sync
- go func() { errc <- d.fetchReceipts(origin + 1) }() // Receipts are retrieved during fast sync
- go func() { errc <- d.fetchNodeData() }() // Node state data is retrieved during fast sync
-
- // If any fetcher fails, cancel the others
- var fail error
- for i := 0; i < cap(errc); i++ {
- if err := <-errc; err != nil {
- if fail == nil {
- fail = err
- d.cancel()
- }
- }
- }
- return fail
+ return d.spawnSync(
+ func() error { return d.fetchHeaders(p, td, origin+1) }, // Headers are always retrieved
+ func() error { return d.fetchBodies(origin + 1) }, // Bodies are retrieved during normal and fast sync
+ func() error { return d.fetchReceipts(origin + 1) }, // Receipts are retrieved during fast sync
+ func() error { return d.fetchNodeData() }, // Node state data is retrieved during fast sync
+ )
default:
// Something very wrong, stop right here
glog.V(logger.Error).Infof("Unsupported eth protocol: %d", p.version)
return errBadPeer
}
- return nil
+}
+
+// spawnSync runs d.process and all given fetcher functions to completion in
+// separate goroutines, returning the first error that appears.
+func (d *Downloader) spawnSync(fetchers ...func() error) error {
+ var wg sync.WaitGroup
+ errc := make(chan error, len(fetchers)+1)
+ wg.Add(len(fetchers) + 1)
+ go func() { defer wg.Done(); errc <- d.process() }()
+ for _, fn := range fetchers {
+ fn := fn
+ go func() { defer wg.Done(); errc <- fn() }()
+ }
+ // Wait for the first error, then terminate the others.
+ var err error
+ for i := 0; i < len(fetchers)+1; i++ {
+ if i == len(fetchers) {
+ // Close the queue when all fetchers have exited.
+ // This will cause the block processor to end when
+ // it has processed the queue.
+ d.queue.Close()
+ }
+ if err = <-errc; err != nil {
+ break
+ }
+ }
+ d.queue.Close()
+ d.cancel()
+ wg.Wait()
+ return err
}
// cancel cancels all of the operations and resets the queue. It returns true
@@ -470,12 +469,10 @@ func (d *Downloader) cancel() {
}
}
d.cancelLock.Unlock()
-
- // Reset the queue
- d.queue.Reset()
}
// Terminate interrupts the downloader, canceling all pending operations.
+// The downloader cannot be reused after calling Terminate.
func (d *Downloader) Terminate() {
atomic.StoreInt32(&d.interrupt, 1)
d.cancel()
@@ -800,7 +797,6 @@ func (d *Downloader) fetchBlocks61(from uint64) error {
peer.Promote()
peer.SetBlocksIdle()
glog.V(logger.Detail).Infof("%s: delivered %d blocks", peer, len(blocks))
- go d.process()
case errInvalidChain:
// The hash chain is invalid (blocks are not ordered properly), abort
@@ -826,7 +822,6 @@ func (d *Downloader) fetchBlocks61(from uint64) error {
peer.Demote()
peer.SetBlocksIdle()
glog.V(logger.Detail).Infof("%s: delivery partially failed: %v", peer, err)
- go d.process()
}
}
// Blocks arrived, try to update the progress
@@ -1336,10 +1331,8 @@ func (d *Downloader) fetchNodeData() error {
d.cancel()
return
}
- // Processing succeeded, notify state fetcher and processor of continuation
- if d.queue.PendingNodeData() == 0 {
- go d.process()
- } else {
+ // Processing succeeded, notify state fetcher of continuation
+ if d.queue.PendingNodeData() > 0 {
select {
case d.stateWakeCh <- true:
default:
@@ -1348,7 +1341,6 @@ func (d *Downloader) fetchNodeData() error {
// Log a message to the user and return
d.syncStatsLock.Lock()
defer d.syncStatsLock.Unlock()
-
d.syncStatsStateDone += uint64(delivered)
glog.V(logger.Info).Infof("imported %d state entries in %v: processed %d in total", delivered, time.Since(start), d.syncStatsStateDone)
})
@@ -1415,7 +1407,6 @@ func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliv
peer.Promote()
setIdle(peer)
glog.V(logger.Detail).Infof("%s: delivered %s %s(s)", peer, packet.Stats(), strings.ToLower(kind))
- go d.process()
case errInvalidChain:
// The hash chain is invalid (blocks are not ordered properly), abort
@@ -1441,7 +1432,6 @@ func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliv
peer.Demote()
setIdle(peer)
glog.V(logger.Detail).Infof("%s: %s delivery partially failed: %v", peer, strings.ToLower(kind), err)
- go d.process()
}
}
// Blocks assembled, try to update the progress
@@ -1508,7 +1498,6 @@ func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliv
}
if progress {
progressed = true
- go d.process()
}
if request == nil {
continue
@@ -1545,46 +1534,13 @@ func (d *Downloader) fetchParts(errCancel error, deliveryCh chan dataPack, deliv
}
// process takes fetch results from the queue and tries to import them into the
-// chain. The type of import operation will depend on the result contents:
-// -
-//
-// The algorithmic flow is as follows:
-// - The `processing` flag is swapped to 1 to ensure singleton access
-// - The current `cancel` channel is retrieved to detect sync abortions
-// - Blocks are iteratively taken from the cache and inserted into the chain
-// - When the cache becomes empty, insertion stops
-// - The `processing` flag is swapped back to 0
-// - A post-exit check is made whether new blocks became available
-// - This step is important: it handles a potential race condition between
-// checking for no more work, and releasing the processing "mutex". In
-// between these state changes, a block may have arrived, but a processing
-// attempt denied, so we need to re-enter to ensure the block isn't left
-// to idle in the cache.
-func (d *Downloader) process() {
- // Make sure only one goroutine is ever allowed to process blocks at once
- if !atomic.CompareAndSwapInt32(&d.processing, 0, 1) {
- return
- }
- // If the processor just exited, but there are freshly pending items, try to
- // reenter. This is needed because the goroutine spinned up for processing
- // the fresh results might have been rejected entry to to this present thread
- // not yet releasing the `processing` state.
- defer func() {
- if atomic.LoadInt32(&d.interrupt) == 0 && d.queue.GetHeadResult() != nil {
- d.process()
- }
- }()
- // Release the lock upon exit (note, before checking for reentry!)
- // the import statistics to zero.
- defer atomic.StoreInt32(&d.processing, 0)
-
- // Repeat the processing as long as there are results to process
+// chain. The type of import operation will depend on the result contents.
+func (d *Downloader) process() error {
+ pivot := d.queue.FastSyncPivot()
for {
- // Fetch the next batch of results
- pivot := d.queue.FastSyncPivot() // Fetch pivot before results to prevent reset race
- results := d.queue.TakeResults()
+ results := d.queue.WaitResults()
if len(results) == 0 {
- return
+ return nil // queue empty
}
if d.chainInsertHook != nil {
d.chainInsertHook(results)
@@ -1597,7 +1553,7 @@ func (d *Downloader) process() {
for len(results) != 0 {
// Check for any termination requests
if atomic.LoadInt32(&d.interrupt) == 1 {
- return
+ return errCancelProcessing
}
// Retrieve the a batch of results to import
var (
@@ -1633,8 +1589,7 @@ func (d *Downloader) process() {
}
if err != nil {
glog.V(logger.Debug).Infof("Result #%d [%x…] processing failed: %v", results[index].Header.Number, results[index].Header.Hash().Bytes()[:4], err)
- d.cancel()
- return
+ return err
}
// Shift the results to the next batch
results = results[items:]
@@ -1685,19 +1640,16 @@ func (d *Downloader) deliver(id string, destCh chan dataPack, packet dataPack, i
dropMeter.Mark(int64(packet.Items()))
}
}()
- // Make sure the downloader is active
- if atomic.LoadInt32(&d.synchronising) == 0 {
- return errNoSyncActive
- }
// Deliver or abort if the sync is canceled while queuing
d.cancelLock.RLock()
cancel := d.cancelCh
d.cancelLock.RUnlock()
-
+ if cancel == nil {
+ return errNoSyncActive
+ }
select {
case destCh <- packet:
return nil
-
case <-cancel:
return errNoSyncActive
}
diff --git a/eth/downloader/downloader_test.go b/eth/downloader/downloader_test.go
index ef6f74a6b..872a4d4f5 100644
--- a/eth/downloader/downloader_test.go
+++ b/eth/downloader/downloader_test.go
@@ -169,17 +169,7 @@ func (dl *downloadTester) sync(id string, td *big.Int, mode SyncMode) error {
}
}
dl.lock.RUnlock()
-
- err := dl.downloader.synchronise(id, hash, td, mode)
- for {
- // If the queue is empty and processing stopped, break
- if dl.downloader.queue.Idle() && atomic.LoadInt32(&dl.downloader.processing) == 0 {
- break
- }
- // Otherwise sleep a bit and retry
- time.Sleep(time.Millisecond)
- }
- return err
+ return dl.downloader.synchronise(id, hash, td, mode)
}
// hasHeader checks if a header is present in the testers canonical chain.
@@ -757,8 +747,8 @@ func testThrottling(t *testing.T, protocol int, mode SyncMode) {
for start := time.Now(); time.Since(start) < time.Second; {
time.Sleep(25 * time.Millisecond)
- tester.lock.RLock()
- tester.downloader.queue.lock.RLock()
+ tester.lock.Lock()
+ tester.downloader.queue.lock.Lock()
cached = len(tester.downloader.queue.blockDonePool)
if mode == FastSync {
if receipts := len(tester.downloader.queue.receiptDonePool); receipts < cached {
@@ -769,8 +759,8 @@ func testThrottling(t *testing.T, protocol int, mode SyncMode) {
}
frozen = int(atomic.LoadUint32(&blocked))
retrieved = len(tester.ownBlocks)
- tester.downloader.queue.lock.RUnlock()
- tester.lock.RUnlock()
+ tester.downloader.queue.lock.Unlock()
+ tester.lock.Unlock()
if cached == blockCacheLimit || retrieved+cached+frozen == targetBlocks+1 {
break
@@ -1209,25 +1199,26 @@ func testBlockHeaderAttackerDropping(t *testing.T, protocol int) {
result error
drop bool
}{
- {nil, false}, // Sync succeeded, all is well
- {errBusy, false}, // Sync is already in progress, no problem
- {errUnknownPeer, false}, // Peer is unknown, was already dropped, don't double drop
- {errBadPeer, true}, // Peer was deemed bad for some reason, drop it
- {errStallingPeer, true}, // Peer was detected to be stalling, drop it
- {errNoPeers, false}, // No peers to download from, soft race, no issue
- {errPendingQueue, false}, // There are blocks still cached, wait to exhaust, no issue
- {errTimeout, true}, // No hashes received in due time, drop the peer
- {errEmptyHashSet, true}, // No hashes were returned as a response, drop as it's a dead end
- {errEmptyHeaderSet, true}, // No headers were returned as a response, drop as it's a dead end
- {errPeersUnavailable, true}, // Nobody had the advertised blocks, drop the advertiser
- {errInvalidChain, true}, // Hash chain was detected as invalid, definitely drop
- {errInvalidBlock, false}, // A bad peer was detected, but not the sync origin
- {errInvalidBody, false}, // A bad peer was detected, but not the sync origin
- {errInvalidReceipt, false}, // A bad peer was detected, but not the sync origin
- {errCancelHashFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
- {errCancelBlockFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
- {errCancelHeaderFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
- {errCancelBodyFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
+ {nil, false}, // Sync succeeded, all is well
+ {errBusy, false}, // Sync is already in progress, no problem
+ {errUnknownPeer, false}, // Peer is unknown, was already dropped, don't double drop
+ {errBadPeer, true}, // Peer was deemed bad for some reason, drop it
+ {errStallingPeer, true}, // Peer was detected to be stalling, drop it
+ {errNoPeers, false}, // No peers to download from, soft race, no issue
+ {errTimeout, true}, // No hashes received in due time, drop the peer
+ {errEmptyHashSet, true}, // No hashes were returned as a response, drop as it's a dead end
+ {errEmptyHeaderSet, true}, // No headers were returned as a response, drop as it's a dead end
+ {errPeersUnavailable, true}, // Nobody had the advertised blocks, drop the advertiser
+ {errInvalidChain, true}, // Hash chain was detected as invalid, definitely drop
+ {errInvalidBlock, false}, // A bad peer was detected, but not the sync origin
+ {errInvalidBody, false}, // A bad peer was detected, but not the sync origin
+ {errInvalidReceipt, false}, // A bad peer was detected, but not the sync origin
+ {errCancelHashFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
+ {errCancelBlockFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
+ {errCancelHeaderFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
+ {errCancelBodyFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
+ {errCancelReceiptFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
+ {errCancelProcessing, false}, // Synchronisation was canceled, origin may be innocent, don't drop
}
// Run the tests and check disconnection status
tester := newTester()
@@ -1541,3 +1532,50 @@ func testFakedSyncProgress(t *testing.T, protocol int, mode SyncMode) {
t.Fatalf("Final progress mismatch: have %v/%v/%v, want 0-%v/%v/%v", origin, current, latest, targetBlocks, targetBlocks, targetBlocks)
}
}
+
+// This test reproduces an issue where unexpected deliveries would
+// block indefinitely if they arrived at the right time.
+func TestDeliverHeadersHang62(t *testing.T) { testDeliverHeadersHang(t, 62, FullSync) }
+func TestDeliverHeadersHang63Full(t *testing.T) { testDeliverHeadersHang(t, 63, FullSync) }
+func TestDeliverHeadersHang63Fast(t *testing.T) { testDeliverHeadersHang(t, 63, FastSync) }
+func TestDeliverHeadersHang64Full(t *testing.T) { testDeliverHeadersHang(t, 64, FullSync) }
+func TestDeliverHeadersHang64Fast(t *testing.T) { testDeliverHeadersHang(t, 64, FastSync) }
+func TestDeliverHeadersHang64Light(t *testing.T) { testDeliverHeadersHang(t, 64, LightSync) }
+
+func testDeliverHeadersHang(t *testing.T, protocol int, mode SyncMode) {
+ t.Parallel()
+ hashes, headers, blocks, receipts := makeChain(5, 0, genesis, nil)
+ fakeHeads := []*types.Header{{}, {}, {}, {}}
+ for i := 0; i < 200; i++ {
+ tester := newTester()
+ tester.newPeer("peer", protocol, hashes, headers, blocks, receipts)
+ // Whenever the downloader requests headers, flood it with
+ // a lot of unrequested header deliveries.
+ tester.downloader.peers.peers["peer"].getAbsHeaders = func(from uint64, count, skip int, reverse bool) error {
+ deliveriesDone := make(chan struct{}, 500)
+ for i := 0; i < cap(deliveriesDone); i++ {
+ peer := fmt.Sprintf("fake-peer%d", i)
+ go func() {
+ tester.downloader.DeliverHeaders(peer, fakeHeads)
+ deliveriesDone <- struct{}{}
+ }()
+ }
+ // Deliver the actual requested headers.
+ impl := tester.peerGetAbsHeadersFn("peer", 0)
+ go impl(from, count, skip, reverse)
+ // None of the extra deliveries should block.
+ timeout := time.After(5 * time.Second)
+ for i := 0; i < cap(deliveriesDone); i++ {
+ select {
+ case <-deliveriesDone:
+ case <-timeout:
+ panic("blocked")
+ }
+ }
+ return nil
+ }
+ if err := tester.sync("peer", nil, mode); err != nil {
+ t.Errorf("sync failed: %v", err)
+ }
+ }
+}
diff --git a/eth/downloader/queue.go b/eth/downloader/queue.go
index 1fb5b6e12..584797d7b 100644
--- a/eth/downloader/queue.go
+++ b/eth/downloader/queue.go
@@ -101,11 +101,14 @@ type queue struct {
resultCache []*fetchResult // Downloaded but not yet delivered fetch results
resultOffset uint64 // Offset of the first cached fetch result in the block chain
- lock sync.RWMutex
+ lock *sync.Mutex
+ active *sync.Cond
+ closed bool
}
// newQueue creates a new download queue for scheduling block retrieval.
func newQueue(stateDb ethdb.Database) *queue {
+ lock := new(sync.Mutex)
return &queue{
hashPool: make(map[common.Hash]int),
hashQueue: prque.New(),
@@ -122,6 +125,8 @@ func newQueue(stateDb ethdb.Database) *queue {
statePendPool: make(map[string]*fetchRequest),
stateDatabase: stateDb,
resultCache: make([]*fetchResult, blockCacheLimit),
+ active: sync.NewCond(lock),
+ lock: lock,
}
}
@@ -133,6 +138,7 @@ func (q *queue) Reset() {
q.stateSchedLock.Lock()
defer q.stateSchedLock.Unlock()
+ q.closed = false
q.mode = FullSync
q.fastSyncPivot = 0
@@ -162,18 +168,27 @@ func (q *queue) Reset() {
q.resultOffset = 0
}
+// Close marks the end of the sync, unblocking WaitResults.
+// It may be called even if the queue is already closed.
+func (q *queue) Close() {
+ q.lock.Lock()
+ q.closed = true
+ q.lock.Unlock()
+ q.active.Broadcast()
+}
+
// PendingBlocks retrieves the number of block (body) requests pending for retrieval.
func (q *queue) PendingBlocks() int {
- q.lock.RLock()
- defer q.lock.RUnlock()
+ q.lock.Lock()
+ defer q.lock.Unlock()
return q.hashQueue.Size() + q.blockTaskQueue.Size()
}
// PendingReceipts retrieves the number of block receipts pending for retrieval.
func (q *queue) PendingReceipts() int {
- q.lock.RLock()
- defer q.lock.RUnlock()
+ q.lock.Lock()
+ defer q.lock.Unlock()
return q.receiptTaskQueue.Size()
}
@@ -192,8 +207,8 @@ func (q *queue) PendingNodeData() int {
// InFlightBlocks retrieves whether there are block fetch requests currently in
// flight.
func (q *queue) InFlightBlocks() bool {
- q.lock.RLock()
- defer q.lock.RUnlock()
+ q.lock.Lock()
+ defer q.lock.Unlock()
return len(q.blockPendPool) > 0
}
@@ -201,8 +216,8 @@ func (q *queue) InFlightBlocks() bool {
// InFlightReceipts retrieves whether there are receipt fetch requests currently
// in flight.
func (q *queue) InFlightReceipts() bool {
- q.lock.RLock()
- defer q.lock.RUnlock()
+ q.lock.Lock()
+ defer q.lock.Unlock()
return len(q.receiptPendPool) > 0
}
@@ -210,8 +225,8 @@ func (q *queue) InFlightReceipts() bool {
// InFlightNodeData retrieves whether there are node data entry fetch requests
// currently in flight.
func (q *queue) InFlightNodeData() bool {
- q.lock.RLock()
- defer q.lock.RUnlock()
+ q.lock.Lock()
+ defer q.lock.Unlock()
return len(q.statePendPool)+int(atomic.LoadInt32(&q.stateProcessors)) > 0
}
@@ -219,8 +234,8 @@ func (q *queue) InFlightNodeData() bool {
// Idle returns if the queue is fully idle or has some data still inside. This
// method is used by the tester to detect termination events.
func (q *queue) Idle() bool {
- q.lock.RLock()
- defer q.lock.RUnlock()
+ q.lock.Lock()
+ defer q.lock.Unlock()
queued := q.hashQueue.Size() + q.blockTaskQueue.Size() + q.receiptTaskQueue.Size() + q.stateTaskQueue.Size()
pending := len(q.blockPendPool) + len(q.receiptPendPool) + len(q.statePendPool)
@@ -237,8 +252,8 @@ func (q *queue) Idle() bool {
// FastSyncPivot retrieves the currently used fast sync pivot point.
func (q *queue) FastSyncPivot() uint64 {
- q.lock.RLock()
- defer q.lock.RUnlock()
+ q.lock.Lock()
+ defer q.lock.Unlock()
return q.fastSyncPivot
}
@@ -246,8 +261,8 @@ func (q *queue) FastSyncPivot() uint64 {
// ShouldThrottleBlocks checks if the download should be throttled (active block (body)
// fetches exceed block cache).
func (q *queue) ShouldThrottleBlocks() bool {
- q.lock.RLock()
- defer q.lock.RUnlock()
+ q.lock.Lock()
+ defer q.lock.Unlock()
// Calculate the currently in-flight block (body) requests
pending := 0
@@ -261,8 +276,8 @@ func (q *queue) ShouldThrottleBlocks() bool {
// ShouldThrottleReceipts checks if the download should be throttled (active receipt
// fetches exceed block cache).
func (q *queue) ShouldThrottleReceipts() bool {
- q.lock.RLock()
- defer q.lock.RUnlock()
+ q.lock.Lock()
+ defer q.lock.Unlock()
// Calculate the currently in-flight receipt requests
pending := 0
@@ -351,91 +366,74 @@ func (q *queue) Schedule(headers []*types.Header, from uint64) []*types.Header {
return inserts
}
-// GetHeadResult retrieves the first fetch result from the cache, or nil if it hasn't
-// been downloaded yet (or simply non existent).
-func (q *queue) GetHeadResult() *fetchResult {
- q.lock.RLock()
- defer q.lock.RUnlock()
+// WaitResults retrieves and permanently removes a batch of fetch
+// results from the cache. the result slice will be empty if the queue
+// has been closed.
+func (q *queue) WaitResults() []*fetchResult {
+ q.lock.Lock()
+ defer q.lock.Unlock()
- // If there are no results pending, return nil
- if len(q.resultCache) == 0 || q.resultCache[0] == nil {
- return nil
- }
- // If the next result is still incomplete, return nil
- if q.resultCache[0].Pending > 0 {
- return nil
+ nproc := q.countProcessableItems()
+ for nproc == 0 && !q.closed {
+ q.active.Wait()
+ nproc = q.countProcessableItems()
}
- // If the next result is the fast sync pivot...
- if q.mode == FastSync && q.resultCache[0].Header.Number.Uint64() == q.fastSyncPivot {
- // If the pivot state trie is still being pulled, return nil
- if len(q.stateTaskPool) > 0 {
- return nil
+ results := make([]*fetchResult, nproc)
+ copy(results, q.resultCache[:nproc])
+ if len(results) > 0 {
+ // Mark results as done before dropping them from the cache.
+ for _, result := range results {
+ hash := result.Header.Hash()
+ delete(q.blockDonePool, hash)
+ delete(q.receiptDonePool, hash)
}
- if q.PendingNodeData() > 0 {
- return nil
- }
- // If the state is done, but not enough post-pivot headers were verified, stall...
- for i := 0; i < fsHeaderForceVerify; i++ {
- if i+1 >= len(q.resultCache) || q.resultCache[i+1] == nil {
- return nil
- }
+ // Delete the results from the cache and clear the tail.
+ copy(q.resultCache, q.resultCache[nproc:])
+ for i := len(q.resultCache) - nproc; i < len(q.resultCache); i++ {
+ q.resultCache[i] = nil
}
+ // Advance the expected block number of the first cache entry.
+ q.resultOffset += uint64(nproc)
}
- return q.resultCache[0]
+ return results
}
-// TakeResults retrieves and permanently removes a batch of fetch results from
-// the cache.
-func (q *queue) TakeResults() []*fetchResult {
- q.lock.Lock()
- defer q.lock.Unlock()
-
- // Accumulate all available results
- results := []*fetchResult{}
+// countProcessableItems counts the processable items.
+func (q *queue) countProcessableItems() int {
for i, result := range q.resultCache {
- // Stop if no more results are ready
+ // Don't process incomplete or unavailable items.
if result == nil || result.Pending > 0 {
- break
+ return i
}
- // The fast sync pivot block may only be processed after state fetch completes
- if q.mode == FastSync && result.Header.Number.Uint64() == q.fastSyncPivot {
- if len(q.stateTaskPool) > 0 {
- break
- }
- if q.PendingNodeData() > 0 {
- break
- }
- // Even is state fetch is done, ensure post-pivot headers passed verifications
- safe := true
- for j := 0; j < fsHeaderForceVerify; j++ {
- if i+j+1 >= len(q.resultCache) || q.resultCache[i+j+1] == nil {
- safe = false
+ // Special handling for the fast-sync pivot block:
+ if q.mode == FastSync {
+ bnum := result.Header.Number.Uint64()
+ if bnum == q.fastSyncPivot {
+ // If the state of the pivot block is not
+ // available yet, we cannot proceed and return 0.
+ //
+ // Stop before processing the pivot block to ensure that
+ // resultCache has space for fsHeaderForceVerify items. Not
+ // doing this could leave us unable to download the required
+ // amount of headers.
+ if i > 0 || len(q.stateTaskPool) > 0 || q.PendingNodeData() > 0 {
+ return i
+ }
+ for j := 0; j < fsHeaderForceVerify; j++ {
+ if i+j+1 >= len(q.resultCache) || q.resultCache[i+j+1] == nil {
+ return i
+ }
}
}
- if !safe {
- break
+ // If we're just the fast sync pivot, stop as well
+ // because the following batch needs different insertion.
+ // This simplifies handling the switchover in d.process.
+ if bnum == q.fastSyncPivot+1 && i > 0 {
+ return i
}
}
- // If we've just inserted the fast sync pivot, stop as the following batch needs different insertion
- if q.mode == FastSync && result.Header.Number.Uint64() == q.fastSyncPivot+1 && len(results) > 0 {
- break
- }
- results = append(results, result)
-
- hash := result.Header.Hash()
- delete(q.blockDonePool, hash)
- delete(q.receiptDonePool, hash)
}
- // Delete the results from the slice and let them be garbage collected
- // without this slice trick the results would stay in memory until nil
- // would be assigned to them.
- copy(q.resultCache, q.resultCache[len(results):])
- for k, n := len(q.resultCache)-len(results), len(q.resultCache); k < n; k++ {
- q.resultCache[k] = nil
- }
- q.resultOffset += uint64(len(results))
-
- return results
+ return len(q.resultCache)
}
// ReserveBlocks reserves a set of block hashes for the given peer, skipping any
@@ -584,6 +582,7 @@ func (q *queue) reserveHeaders(p *peer, count int, taskPool map[common.Hash]*typ
// If we're the first to request this task, initialise the result container
index := int(header.Number.Int64() - int64(q.resultOffset))
if index >= len(q.resultCache) || index < 0 {
+ common.Report("index allocation went beyond available resultCache space")
return nil, false, errInvalidChain
}
if q.resultCache[index] == nil {
@@ -617,6 +616,10 @@ func (q *queue) reserveHeaders(p *peer, count int, taskPool map[common.Hash]*typ
for _, header := range skip {
taskQueue.Push(header, -float32(header.Number.Uint64()))
}
+ if progress {
+ // Wake WaitResults, resultCache was modified
+ q.active.Signal()
+ }
// Assemble and return the block download request
if len(send) == 0 {
return nil, progress, nil
@@ -737,7 +740,7 @@ func (q *queue) ExpireNodeData(timeout time.Duration) []string {
// expire is the generic check that move expired tasks from a pending pool back
// into a task pool, returning all entities caught with expired tasks.
//
-// Note, this method expects the queue lock to be already held for writing. The
+// Note, this method expects the queue lock to be already held. The
// reason the lock is not obtained in here is because the parameters already need
// to access the queue, so they already need a lock anyway.
func (q *queue) expire(timeout time.Duration, pendPool map[string]*fetchRequest, taskQueue *prque.Prque, timeoutMeter metrics.Meter) []string {
@@ -813,17 +816,16 @@ func (q *queue) DeliverBlocks(id string, blocks []*types.Block) error {
for hash, index := range request.Hashes {
q.hashQueue.Push(hash, float32(index))
}
+ // Wake up WaitResults
+ q.active.Signal()
// If none of the blocks were good, it's a stale delivery
switch {
case len(errs) == 0:
return nil
-
case len(errs) == 1 && (errs[0] == errInvalidChain || errs[0] == errInvalidBlock):
return errs[0]
-
case len(errs) == len(blocks):
return errStaleDelivery
-
default:
return fmt.Errorf("multiple failures: %v", errs)
}
@@ -915,14 +917,14 @@ func (q *queue) deliver(id string, taskPool map[common.Hash]*types.Header, taskQ
taskQueue.Push(header, -float32(header.Number.Uint64()))
}
}
+ // Wake up WaitResults
+ q.active.Signal()
// If none of the data was good, it's a stale delivery
switch {
case failure == nil || failure == errInvalidChain:
return failure
-
case useful:
return fmt.Errorf("partial failure: %v", failure)
-
default:
return errStaleDelivery
}
@@ -977,10 +979,8 @@ func (q *queue) DeliverNodeData(id string, data [][]byte, callback func(error, i
switch {
case len(errs) == 0:
return nil
-
case len(errs) == len(request.Hashes):
return errStaleDelivery
-
default:
return fmt.Errorf("multiple failures: %v", errs)
}
@@ -989,6 +989,10 @@ func (q *queue) DeliverNodeData(id string, data [][]byte, callback func(error, i
// deliverNodeData is the asynchronous node data processor that injects a batch
// of sync results into the state scheduler.
func (q *queue) deliverNodeData(results []trie.SyncResult, callback func(error, int)) {
+ // Wake up WaitResults after the state has been written because it
+ // might be waiting for the pivot block state to get completed.
+ defer q.active.Signal()
+
// Process results one by one to permit task fetches in between
for i, result := range results {
q.stateSchedLock.Lock()
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-31 07:40:15 +0800