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