status-go/vendor/github.com/jackpal/go-nat-pmp/recorder.go

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package natpmp
type callObserver interface {
observeCall(msg []byte, result []byte, err error)
}
// A caller that records the RPC call.
type recorder struct {
child caller
observer callObserver
}
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func (n *recorder) call(msg []byte) (result []byte, err error) {
result, err = n.child.call(msg)
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n.observer.observeCall(msg, result, err)
return
}