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140 lines
3.3 KiB
140 lines
3.3 KiB
package pex
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import (
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"time"
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"github.com/tendermint/tendermint/p2p"
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)
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// knownAddress tracks information about a known network address
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// that is used to determine how viable an address is.
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type knownAddress struct {
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Addr *p2p.NetAddress `json:"addr"`
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Src *p2p.NetAddress `json:"src"`
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Buckets []int `json:"buckets"`
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Attempts int32 `json:"attempts"`
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BucketType byte `json:"bucket_type"`
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LastAttempt time.Time `json:"last_attempt"`
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LastSuccess time.Time `json:"last_success"`
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LastBanTime time.Time `json:"last_ban_time"`
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}
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func newKnownAddress(addr *p2p.NetAddress, src *p2p.NetAddress) *knownAddress {
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return &knownAddress{
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Addr: addr,
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Src: src,
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Attempts: 0,
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LastAttempt: time.Now(),
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BucketType: bucketTypeNew,
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Buckets: nil,
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}
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}
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func (ka *knownAddress) ID() p2p.ID {
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return ka.Addr.ID
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}
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func (ka *knownAddress) isOld() bool {
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return ka.BucketType == bucketTypeOld
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}
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func (ka *knownAddress) isNew() bool {
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return ka.BucketType == bucketTypeNew
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}
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func (ka *knownAddress) markAttempt() {
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now := time.Now()
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ka.LastAttempt = now
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ka.Attempts++
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}
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func (ka *knownAddress) markGood() {
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now := time.Now()
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ka.LastAttempt = now
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ka.Attempts = 0
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ka.LastSuccess = now
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}
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func (ka *knownAddress) ban(banTime time.Duration) {
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if ka.LastBanTime.Before(time.Now().Add(banTime)) {
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ka.LastBanTime = time.Now().Add(banTime)
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}
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}
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func (ka *knownAddress) isBanned() bool {
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return ka.LastBanTime.After(time.Now())
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}
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func (ka *knownAddress) addBucketRef(bucketIdx int) int {
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for _, bucket := range ka.Buckets {
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if bucket == bucketIdx {
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// TODO refactor to return error?
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// log.Warn(Fmt("Bucket already exists in ka.Buckets: %v", ka))
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return -1
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}
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}
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ka.Buckets = append(ka.Buckets, bucketIdx)
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return len(ka.Buckets)
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}
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func (ka *knownAddress) removeBucketRef(bucketIdx int) int {
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buckets := []int{}
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for _, bucket := range ka.Buckets {
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if bucket != bucketIdx {
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buckets = append(buckets, bucket)
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}
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}
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if len(buckets) != len(ka.Buckets)-1 {
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// TODO refactor to return error?
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// log.Warn(Fmt("bucketIdx not found in ka.Buckets: %v", ka))
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return -1
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}
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ka.Buckets = buckets
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return len(ka.Buckets)
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}
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/*
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An address is bad if the address in question is a New address, 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 week
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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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*/
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func (ka *knownAddress) isBad() bool {
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// Is Old --> good
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if ka.BucketType == bucketTypeOld {
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return false
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}
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// Has been attempted in the last minute --> good
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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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// TODO: From the future?
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// Too old?
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// TODO: should be a timestamp of last seen, not just last attempt
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if ka.LastAttempt.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.Before(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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