syncthing/vendor/github.com/AudriusButkevicius/kcp-go/blacklist.go
2017-10-25 19:34:38 +00:00

57 lines
958 B
Go

package kcp
import (
"sync"
"time"
)
var (
BlacklistDuration time.Duration
blacklist = blacklistMap{
entries: make(map[sessionKey]time.Time),
}
)
// a global map for blacklisting conversations
type blacklistMap struct {
entries map[sessionKey]time.Time
reapAt time.Time
mut sync.Mutex
}
func (m *blacklistMap) add(address string, conv uint32) {
if BlacklistDuration == 0 {
return
}
m.mut.Lock()
timeout := time.Now().Add(BlacklistDuration)
m.entries[sessionKey{
addr: address,
convID: conv,
}] = timeout
m.reap()
m.mut.Unlock()
}
func (m *blacklistMap) has(address string, conv uint32) bool {
if BlacklistDuration == 0 {
return false
}
m.mut.Lock()
t, ok := m.entries[sessionKey{
addr: address,
convID: conv,
}]
m.mut.Unlock()
return ok && t.After(time.Now())
}
func (m *blacklistMap) reap() {
now := time.Now()
for k, t := range m.entries {
if t.Before(now) {
delete(m.entries, k)
}
}
}