// NewPortAllocatorCustom creates a PortAllocator over a net.PortRange, calling allocatorFactory to construct the backing store.
func NewPortAllocatorCustom(pr net.PortRange, allocatorFactory allocator.AllocatorFactory) *PortAllocator {
max := pr.Size
rangeSpec := pr.String()
a := &PortAllocator{
portRange: pr,
}
a.alloc = allocatorFactory(max, rangeSpec)
return a
}
// Restore restores the pool to the previously captured state. ErrMismatchedNetwork
// is returned if the provided port range doesn't exactly match the previous range.
func (r *PortAllocator) Restore(pr net.PortRange, data []byte) error {
if pr.String() != r.portRange.String() {
return ErrMismatchedNetwork
}
snapshottable, ok := r.alloc.(allocator.Snapshottable)
if !ok {
return fmt.Errorf("not a snapshottable allocator")
}
return snapshottable.Restore(pr.String(), data)
}