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101 lines
2.5 KiB
101 lines
2.5 KiB
// Copyright (c) 2013-2014 The btcsuite developers |
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// Use of this source code is governed by an ISC |
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// license that can be found in the LICENSE file. |
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package addrmgr |
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import ( |
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"time" |
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"github.com/btcsuite/btcd/wire" |
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) |
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// KnownAddress tracks information about a known network address that is used |
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// to determine how viable an address is. |
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type KnownAddress struct { |
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na *wire.NetAddress |
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srcAddr *wire.NetAddress |
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attempts int |
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lastattempt time.Time |
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lastsuccess time.Time |
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tried bool |
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refs int // reference count of new buckets |
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} |
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// NetAddress returns the underlying wire.NetAddress associated with the |
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// known address. |
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func (ka *KnownAddress) NetAddress() *wire.NetAddress { |
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return ka.na |
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} |
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// LastAttempt returns the last time the known address was attempted. |
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func (ka *KnownAddress) LastAttempt() time.Time { |
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return ka.lastattempt |
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} |
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// chance returns the selection probability for a known address. The priority |
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// depends upon how recently the address has been seen, how recently it was last |
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// attempted and how often attempts to connect to it have failed. |
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func (ka *KnownAddress) chance() float64 { |
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now := time.Now() |
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lastSeen := now.Sub(ka.na.Timestamp) |
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lastAttempt := now.Sub(ka.lastattempt) |
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if lastSeen < 0 { |
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lastSeen = 0 |
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} |
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if lastAttempt < 0 { |
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lastAttempt = 0 |
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} |
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c := 1.0 |
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// Very recent attempts are less likely to be retried. |
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if lastAttempt < 10*time.Minute { |
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c *= 0.01 |
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} |
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// Failed attempts deprioritise. |
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for i := ka.attempts; i > 0; i-- { |
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c /= 1.5 |
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} |
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return c |
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} |
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// isBad returns true if the address in question has not been tried in the last |
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// minute and meets one of the following criteria: |
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// 1) It claims to be from the future |
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// 2) It hasn't been seen in over a month |
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// 3) It has failed at least three times and never succeeded |
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// 4) It has failed ten times in the last week |
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// All addresses that meet these criteria are assumed to be worthless and not |
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// worth keeping hold of. |
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func (ka *KnownAddress) isBad() bool { |
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if ka.lastattempt.After(time.Now().Add(-1 * time.Minute)) { |
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return false |
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} |
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// From the future? |
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if ka.na.Timestamp.After(time.Now().Add(10 * time.Minute)) { |
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return true |
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} |
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// Over a month old? |
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if ka.na.Timestamp.Before(time.Now().Add(-1 * numMissingDays * time.Hour * 24)) { |
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return true |
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} |
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// Never succeeded? |
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if ka.lastsuccess.IsZero() && ka.attempts >= numRetries { |
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return true |
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} |
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// Hasn't succeeded in too long? |
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if !ka.lastsuccess.After(time.Now().Add(-1*minBadDays*time.Hour*24)) && |
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ka.attempts >= maxFailures { |
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return true |
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} |
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return false |
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}
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