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147 lines
3.4 KiB
147 lines
3.4 KiB
package protocol
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import (
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"sync"
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"time"
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"github.com/v2ray/v2ray-core/common"
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"github.com/v2ray/v2ray-core/common/signal"
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)
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const (
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updateIntervalSec = 10
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cacheDurationSec = 120
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)
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type idEntry struct {
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id *ID
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userIdx int
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lastSec Timestamp
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lastSecRemoval Timestamp
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}
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type UserValidator interface {
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common.Releasable
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Add(user *User) error
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Get(timeHash []byte) (*User, Timestamp, bool)
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}
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type TimedUserValidator struct {
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validUsers []*User
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userHash map[[16]byte]*indexTimePair
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ids []*idEntry
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access sync.RWMutex
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hasher IDHash
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cancel *signal.CancelSignal
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}
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type indexTimePair struct {
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index int
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timeSec Timestamp
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}
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func NewTimedUserValidator(hasher IDHash) UserValidator {
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tus := &TimedUserValidator{
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validUsers: make([]*User, 0, 16),
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userHash: make(map[[16]byte]*indexTimePair, 512),
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access: sync.RWMutex{},
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ids: make([]*idEntry, 0, 512),
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hasher: hasher,
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cancel: signal.NewCloseSignal(),
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}
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go tus.updateUserHash(updateIntervalSec*time.Second, tus.cancel)
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return tus
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}
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func (this *TimedUserValidator) Release() {
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this.cancel.Cancel()
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<-this.cancel.WaitForDone()
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this.validUsers = nil
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this.userHash = nil
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this.ids = nil
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this.hasher = nil
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this.cancel = nil
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}
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func (this *TimedUserValidator) generateNewHashes(nowSec Timestamp, idx int, entry *idEntry) {
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var hashValue [16]byte
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var hashValueRemoval [16]byte
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idHash := this.hasher(entry.id.Bytes())
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for entry.lastSec <= nowSec {
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idHash.Write(entry.lastSec.Bytes())
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idHash.Sum(hashValue[:0])
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idHash.Reset()
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idHash.Write(entry.lastSecRemoval.Bytes())
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idHash.Sum(hashValueRemoval[:0])
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idHash.Reset()
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this.access.Lock()
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this.userHash[hashValue] = &indexTimePair{idx, entry.lastSec}
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delete(this.userHash, hashValueRemoval)
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this.access.Unlock()
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entry.lastSec++
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entry.lastSecRemoval++
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}
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}
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func (this *TimedUserValidator) updateUserHash(interval time.Duration, cancel *signal.CancelSignal) {
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L:
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for {
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select {
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case now := <-time.After(interval):
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nowSec := Timestamp(now.Unix() + cacheDurationSec)
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for _, entry := range this.ids {
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this.generateNewHashes(nowSec, entry.userIdx, entry)
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}
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case <-cancel.WaitForCancel():
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break L
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}
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}
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cancel.Done()
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}
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func (this *TimedUserValidator) Add(user *User) error {
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idx := len(this.validUsers)
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this.validUsers = append(this.validUsers, user)
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account := user.Account.(*VMessAccount)
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nowSec := time.Now().Unix()
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entry := &idEntry{
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id: account.ID,
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userIdx: idx,
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lastSec: Timestamp(nowSec - cacheDurationSec),
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lastSecRemoval: Timestamp(nowSec - cacheDurationSec*3),
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}
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this.generateNewHashes(Timestamp(nowSec+cacheDurationSec), idx, entry)
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this.ids = append(this.ids, entry)
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for _, alterid := range account.AlterIDs {
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entry := &idEntry{
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id: alterid,
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userIdx: idx,
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lastSec: Timestamp(nowSec - cacheDurationSec),
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lastSecRemoval: Timestamp(nowSec - cacheDurationSec*3),
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}
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this.generateNewHashes(Timestamp(nowSec+cacheDurationSec), idx, entry)
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this.ids = append(this.ids, entry)
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}
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return nil
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}
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func (this *TimedUserValidator) Get(userHash []byte) (*User, Timestamp, bool) {
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defer this.access.RUnlock()
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this.access.RLock()
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var fixedSizeHash [16]byte
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copy(fixedSizeHash[:], userHash)
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pair, found := this.userHash[fixedSizeHash]
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if found {
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return this.validUsers[pair.index], pair.timeSec, true
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}
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return nil, 0, false
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}
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