status-go/vendor/github.com/libp2p/go-libp2p-pubsub/blacklist.go

65 lines
1.3 KiB
Go

package pubsub
import (
"sync"
"time"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/whyrusleeping/timecache"
)
// Blacklist is an interface for peer blacklisting.
type Blacklist interface {
Add(peer.ID) bool
Contains(peer.ID) bool
}
// MapBlacklist is a blacklist implementation using a perfect map
type MapBlacklist map[peer.ID]struct{}
// NewMapBlacklist creates a new MapBlacklist
func NewMapBlacklist() Blacklist {
return MapBlacklist(make(map[peer.ID]struct{}))
}
func (b MapBlacklist) Add(p peer.ID) bool {
b[p] = struct{}{}
return true
}
func (b MapBlacklist) Contains(p peer.ID) bool {
_, ok := b[p]
return ok
}
// TimeCachedBlacklist is a blacklist implementation using a time cache
type TimeCachedBlacklist struct {
sync.RWMutex
tc *timecache.TimeCache
}
// NewTimeCachedBlacklist creates a new TimeCachedBlacklist with the given expiry duration
func NewTimeCachedBlacklist(expiry time.Duration) (Blacklist, error) {
b := &TimeCachedBlacklist{tc: timecache.NewTimeCache(expiry)}
return b, nil
}
// Add returns a bool saying whether Add of peer was successful
func (b *TimeCachedBlacklist) Add(p peer.ID) bool {
b.Lock()
defer b.Unlock()
s := p.String()
if b.tc.Has(s) {
return false
}
b.tc.Add(s)
return true
}
func (b *TimeCachedBlacklist) Contains(p peer.ID) bool {
b.RLock()
defer b.RUnlock()
return b.tc.Has(p.String())
}