ceremonyclient/go-libp2p/p2p/net/swarm/swarm_addr.go
2023-08-20 23:07:43 -05:00

73 lines
2.0 KiB
Go

package swarm
import (
"time"
manet "github.com/multiformats/go-multiaddr/net"
ma "github.com/multiformats/go-multiaddr"
)
// ListenAddresses returns a list of addresses at which this swarm listens.
func (s *Swarm) ListenAddresses() []ma.Multiaddr {
s.listeners.RLock()
defer s.listeners.RUnlock()
return s.listenAddressesNoLock()
}
func (s *Swarm) listenAddressesNoLock() []ma.Multiaddr {
addrs := make([]ma.Multiaddr, 0, len(s.listeners.m)+10) // A bit extra so we may avoid an extra allocation in the for loop below.
for l := range s.listeners.m {
addrs = append(addrs, l.Multiaddr())
}
return addrs
}
const ifaceAddrsCacheDuration = 1 * time.Minute
// InterfaceListenAddresses returns a list of addresses at which this swarm
// listens. It expands "any interface" addresses (/ip4/0.0.0.0, /ip6/::) to
// use the known local interfaces.
func (s *Swarm) InterfaceListenAddresses() ([]ma.Multiaddr, error) {
s.listeners.RLock() // RLock start
ifaceListenAddres := s.listeners.ifaceListenAddres
isEOL := time.Now().After(s.listeners.cacheEOL)
s.listeners.RUnlock() // RLock end
if !isEOL {
// Cache is valid, clone the slice
return append(ifaceListenAddres[:0:0], ifaceListenAddres...), nil
}
// Cache is not valid
// Perfrom double checked locking
s.listeners.Lock() // Lock start
ifaceListenAddres = s.listeners.ifaceListenAddres
isEOL = time.Now().After(s.listeners.cacheEOL)
if isEOL {
// Cache is still invalid
listenAddres := s.listenAddressesNoLock()
if len(listenAddres) > 0 {
// We're actually listening on addresses.
var err error
ifaceListenAddres, err = manet.ResolveUnspecifiedAddresses(listenAddres, nil)
if err != nil {
s.listeners.Unlock() // Lock early exit
return nil, err
}
} else {
ifaceListenAddres = nil
}
s.listeners.ifaceListenAddres = ifaceListenAddres
s.listeners.cacheEOL = time.Now().Add(ifaceAddrsCacheDuration)
}
s.listeners.Unlock() // Lock end
return append(ifaceListenAddres[:0:0], ifaceListenAddres...), nil
}