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conn_set.go
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conn_set.go
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package p2p
import (
"net"
"sync"
)
// ConnSet is a lookup table for connections and all their ips.
type ConnSet interface {
Has(net.Conn) bool
HasIP(net.IP) bool
Set(net.Conn, []net.IP)
Remove(net.Conn)
}
type connSetItem struct {
conn net.Conn
ips []net.IP
}
type connSet struct {
sync.RWMutex
conns map[string]connSetItem
}
// NewConnSet returns a ConnSet implementation.
func NewConnSet() *connSet {
return &connSet{
conns: map[string]connSetItem{},
}
}
func (cs *connSet) Has(c net.Conn) bool {
cs.RLock()
defer cs.RUnlock()
_, ok := cs.conns[c.RemoteAddr().String()]
return ok
}
func (cs *connSet) HasIP(ip net.IP) bool {
cs.RLock()
defer cs.RUnlock()
for _, c := range cs.conns {
for _, known := range c.ips {
if known.Equal(ip) {
return true
}
}
}
return false
}
func (cs *connSet) Remove(c net.Conn) {
cs.Lock()
defer cs.Unlock()
delete(cs.conns, c.RemoteAddr().String())
}
func (cs *connSet) Set(c net.Conn, ips []net.IP) {
cs.Lock()
defer cs.Unlock()
cs.conns[c.RemoteAddr().String()] = connSetItem{
conn: c,
ips: ips,
}
}