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@ -6,6 +6,7 @@ import ( |
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"math/rand" |
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"reflect" |
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"sort" |
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"sync" |
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"time" |
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"github.com/pkg/errors" |
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@ -59,6 +60,8 @@ type PEXReactor struct { |
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// maps to prevent abuse
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requestsSent *cmn.CMap // ID->struct{}: unanswered send requests
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lastReceivedRequests *cmn.CMap // ID->time.Time: last time peer requested from us
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attemptsToDial sync.Map // dial addr -> number of attempts to dial (for exponential backoff)
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} |
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// PEXReactorConfig holds reactor specific configuration data.
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@ -338,9 +341,22 @@ func (r *PEXReactor) ensurePeers() { |
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toDial[try.ID] = try |
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} |
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// 1s == (1e9 ns) == (1 Billion ns)
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billionNs := float64(time.Second.Nanoseconds()) |
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// Dial picked addresses
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for _, item := range toDial { |
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for _, addr := range toDial { |
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go func(picked *p2p.NetAddress) { |
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// exponential backoff if it's not our first attempt to dial picked address
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var attempt int |
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if lAttempt, notFirstAttempt := r.attemptsToDial.Load(picked.DialString()); notFirstAttempt { |
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attempt = lAttempt.(int) |
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jitterSeconds := time.Duration(rand.Float64() * billionNs) |
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backoffDuration := jitterSeconds + ((1 << uint(attempt)) * time.Second) |
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r.Logger.Debug(fmt.Sprintf("Dialing %v", picked), "attempt", attempt, "backoff_duration", backoffDuration) |
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time.Sleep(backoffDuration) |
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} |
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err := r.Switch.DialPeerWithAddress(picked, false) |
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if err != nil { |
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r.Logger.Error("Dialing failed", "err", err) |
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@ -350,8 +366,13 @@ func (r *PEXReactor) ensurePeers() { |
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} else { |
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r.book.MarkAttempt(picked) |
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} |
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// record attempt
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r.attemptsToDial.Store(picked.DialString(), attempt+1) |
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} else { |
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// cleanup any history
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r.attemptsToDial.Delete(picked.DialString()) |
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} |
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}(item) |
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}(addr) |
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} |
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// If we need more addresses, pick a random peer and ask for more.
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