48 lines
1.5 KiB
Go
48 lines
1.5 KiB
Go
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package nat
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import (
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notifier "github.com/whyrusleeping/go-notifier"
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)
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// Notifier is an object that assists NAT in notifying listeners.
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// It is implemented using thirdparty/notifier
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type Notifier struct {
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n notifier.Notifier
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}
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func (n *Notifier) notifyAll(notify func(n Notifiee)) {
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n.n.NotifyAll(func(n notifier.Notifiee) {
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notify(n.(Notifiee))
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})
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}
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// Notify signs up notifiee to listen to NAT events.
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func (n *Notifier) Notify(notifiee Notifiee) {
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n.n.Notify(n)
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}
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// StopNotify stops signaling events to notifiee.
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func (n *Notifier) StopNotify(notifiee Notifiee) {
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n.n.StopNotify(notifiee)
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}
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// Notifiee is an interface objects must implement to listen to NAT events.
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type Notifiee interface {
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// Called every time a successful mapping happens
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// Warning: the port mapping may have changed. If that is the
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// case, both MappingSuccess and MappingChanged are called.
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MappingSuccess(nat *NAT, m Mapping)
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// Called when mapping a port succeeds, but the mapping is
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// with a different port than an earlier success.
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MappingChanged(nat *NAT, m Mapping, oldport int, newport int)
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// Called when a port mapping fails. NAT will continue attempting after
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// the next period. To stop trying, use: mapping.Close(). After this failure,
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// mapping.ExternalPort() will be zero, and nat.ExternalAddrs() will not
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// return the address for this mapping. With luck, the next attempt will
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// succeed, without the client needing to do anything.
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MappingFailed(nat *NAT, m Mapping, oldport int, err error)
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}
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