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