mirror of
https://github.com/go-i2p/go-i2p-bt.git
synced 2025-07-01 03:57:55 -04:00
108 lines
2.4 KiB
Go
108 lines
2.4 KiB
Go
// Copyright 2020 xgfone, 2023 idk
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package dht
|
|
|
|
import (
|
|
"net"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/go-i2p/go-i2p-bt/utils"
|
|
)
|
|
|
|
// TokenManager is used to manage and validate the token.
|
|
//
|
|
// TODO: Should we allocate the different token for each node??
|
|
type tokenManager struct {
|
|
lock sync.RWMutex
|
|
last string
|
|
new string
|
|
exit chan struct{}
|
|
addrs sync.Map
|
|
}
|
|
|
|
func newTokenManager() *tokenManager {
|
|
token := utils.RandomString(8)
|
|
return &tokenManager{last: token, new: token, exit: make(chan struct{})}
|
|
}
|
|
|
|
func (tm *tokenManager) updateToken() {
|
|
token := utils.RandomString(8)
|
|
tm.lock.Lock()
|
|
tm.last, tm.new = tm.new, token
|
|
tm.lock.Unlock()
|
|
}
|
|
|
|
func (tm *tokenManager) clear(now time.Time, expired time.Duration) {
|
|
tm.addrs.Range(func(k interface{}, v interface{}) bool {
|
|
if now.Sub(v.(time.Time)) >= expired {
|
|
tm.addrs.Delete(k)
|
|
}
|
|
return true
|
|
})
|
|
}
|
|
|
|
// Start starts the token manager.
|
|
func (tm *tokenManager) Start(expired time.Duration) {
|
|
tick1 := time.NewTicker(expired)
|
|
tick2 := time.NewTicker(expired / 2)
|
|
defer tick1.Stop()
|
|
defer tick2.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-tm.exit:
|
|
return
|
|
case <-tick2.C:
|
|
tm.updateToken()
|
|
case now := <-tick1.C:
|
|
tm.clear(now, expired)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Stop stops the token manager.
|
|
func (tm *tokenManager) Stop() {
|
|
select {
|
|
case <-tm.exit:
|
|
default:
|
|
close(tm.exit)
|
|
}
|
|
}
|
|
|
|
// Token allocates a token for a node addr and returns the token.
|
|
func (tm *tokenManager) Token(addr net.Addr) (token string) {
|
|
addrs := addr.String()
|
|
tm.lock.RLock()
|
|
token = tm.new
|
|
tm.lock.RUnlock()
|
|
tm.addrs.Store(addrs, time.Now())
|
|
return
|
|
}
|
|
|
|
// Check checks whether the token associated with the node addr is valid,
|
|
// that's, it's not expired.
|
|
func (tm *tokenManager) Check(addr net.Addr, token string) (ok bool) {
|
|
tm.lock.RLock()
|
|
last, new := tm.last, tm.new
|
|
tm.lock.RUnlock()
|
|
|
|
if last == token || new == token {
|
|
_, ok = tm.addrs.Load(addr.String())
|
|
}
|
|
|
|
return
|
|
}
|