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eth/downloader: save the correct delivery time for state sync #21427

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Aug 7, 2020
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eth/downloader: save the correct delivery time for state sync #21427

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19 changes: 10 additions & 9 deletions eth/downloader/statesync.go
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Original file line number Diff line number Diff line change
Expand Up @@ -34,13 +34,14 @@ import (
// stateReq represents a batch of state fetch requests grouped together into
// a single data retrieval network packet.
type stateReq struct {
nItems uint16 // Number of items requested for download (max is 384, so uint16 is sufficient)
tasks map[common.Hash]*stateTask // Download tasks to track previous attempts
timeout time.Duration // Maximum round trip time for this to complete
timer *time.Timer // Timer to fire when the RTT timeout expires
peer *peerConnection // Peer that we're requesting from
response [][]byte // Response data of the peer (nil for timeouts)
dropped bool // Flag whether the peer dropped off early
nItems uint16 // Number of items requested for download (max is 384, so uint16 is sufficient)
tasks map[common.Hash]*stateTask // Download tasks to track previous attempts
timeout time.Duration // Maximum round trip time for this to complete
timer *time.Timer // Timer to fire when the RTT timeout expires
peer *peerConnection // Peer that we're requesting from
delivered time.Time // Time when the packet was delivered (independent when we process it)
response [][]byte // Response data of the peer (nil for timeouts)
dropped bool // Flag whether the peer dropped off early
}

// timedOut returns if this request timed out.
Expand Down Expand Up @@ -148,6 +149,7 @@ func (d *Downloader) runStateSync(s *stateSync) *stateSync {
// Finalize the request and queue up for processing
req.timer.Stop()
req.response = pack.(*statePack).states
req.delivered = time.Now()

finished = append(finished, req)
delete(active, pack.PeerId())
Expand Down Expand Up @@ -349,7 +351,6 @@ func (s *stateSync) loop() (err error) {
return errCanceled

case req := <-s.deliver:
deliveryTime := time.Now()
// Response, disconnect or timeout triggered, drop the peer if stalling
log.Trace("Received node data response", "peer", req.peer.id, "count", len(req.response), "dropped", req.dropped, "timeout", !req.dropped && req.timedOut())
if req.nItems <= 2 && !req.dropped && req.timedOut() {
Expand All @@ -376,7 +377,7 @@ func (s *stateSync) loop() (err error) {
}
// Process all the received blobs and check for stale delivery
delivered, err := s.process(req)
req.peer.SetNodeDataIdle(delivered, deliveryTime)
req.peer.SetNodeDataIdle(delivered, req.delivered)
if err != nil {
log.Warn("Node data write error", "err", err)
return err
Expand Down