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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package relaysvc | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
|
|
||
| relayv2 "github.com/libp2p/go-libp2p/p2p/protocol/circuitv2/relay" | ||
|
|
||
| "github.com/libp2p/go-libp2p-core/event" | ||
| "github.com/libp2p/go-libp2p-core/host" | ||
| "github.com/libp2p/go-libp2p-core/network" | ||
| ) | ||
|
|
||
| type RelayManager struct { | ||
| host host.Host | ||
|
|
||
| mutex sync.Mutex | ||
| relay *relayv2.Relay | ||
| opts []relayv2.Option | ||
|
|
||
| refCount sync.WaitGroup | ||
| ctxCancel context.CancelFunc | ||
| } | ||
|
|
||
| func NewRelayManager(host host.Host, opts ...relayv2.Option) *RelayManager { | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| m := &RelayManager{ | ||
| host: host, | ||
| opts: opts, | ||
| ctxCancel: cancel, | ||
| } | ||
| m.refCount.Add(1) | ||
| go m.background(ctx) | ||
| return m | ||
| } | ||
|
|
||
| func (m *RelayManager) background(ctx context.Context) { | ||
| defer m.refCount.Done() | ||
| defer func() { | ||
| m.mutex.Lock() | ||
| if m.relay != nil { | ||
| m.relay.Close() | ||
| } | ||
| m.mutex.Unlock() | ||
| }() | ||
|
|
||
| subReachability, _ := m.host.EventBus().Subscribe(new(event.EvtLocalReachabilityChanged)) | ||
| defer subReachability.Close() | ||
|
|
||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case ev, ok := <-subReachability.Out(): | ||
| if !ok { | ||
| return | ||
| } | ||
| if err := m.reachabilityChanged(ev.(event.EvtLocalReachabilityChanged).Reachability); err != nil { | ||
| return | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (m *RelayManager) reachabilityChanged(r network.Reachability) error { | ||
| switch r { | ||
| case network.ReachabilityPublic: | ||
| relay, err := relayv2.New(m.host, m.opts...) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| m.mutex.Lock() | ||
| defer m.mutex.Unlock() | ||
| m.relay = relay | ||
| case network.ReachabilityPrivate: | ||
| m.mutex.Lock() | ||
| defer m.mutex.Unlock() | ||
| if m.relay != nil { | ||
| err := m.relay.Close() | ||
| m.relay = nil | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (m *RelayManager) Close() error { | ||
| m.ctxCancel() | ||
| m.refCount.Wait() | ||
| return nil | ||
| } |