status-go/vendor/github.com/libp2p/go-libp2p-swarm/swarm_addr.go

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package swarm
import (
"time"
addrutil "github.com/libp2p/go-addr-util"
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))
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 ifaceListenAddres != nil && !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 ifaceListenAddres == nil || isEOL {
// Cache is still invalid
var err error
ifaceListenAddres, err = addrutil.ResolveUnspecifiedAddresses(
s.listenAddressesNoLock(), nil)
if err != nil {
s.listeners.Unlock() // Lock early exit
return nil, err
}
s.listeners.ifaceListenAddres = ifaceListenAddres
s.listeners.cacheEOL = time.Now().Add(ifaceAddrsCacheDuration)
}
s.listeners.Unlock() // Lock end
return append(ifaceListenAddres[:0:0], ifaceListenAddres...), nil
}