func (p *FakeNetworkPool) Acquire() (*network.Network, error) {
if p.AcquireError != nil {
return nil, p.AcquireError
}
_, ipNet, err := net.ParseCIDR(p.nextNetwork.String() + "/30")
if err != nil {
return nil, err
}
inc(p.nextNetwork)
inc(p.nextNetwork)
inc(p.nextNetwork)
inc(p.nextNetwork)
return network.New(ipNet), nil
}
func New(ipNet *net.IPNet) *RealNetworkPool {
pool := []*network.Network{}
_, startNet, err := net.ParseCIDR(ipNet.IP.String() + "/30")
if err != nil {
panic(err)
}
for subnet := startNet; ipNet.Contains(subnet.IP); subnet = nextSubnet(subnet) {
pool = append(pool, network.New(subnet))
}
return &RealNetworkPool{
ipNet: ipNet,
pool: pool,
poolMutex: new(sync.Mutex),
}
}
_, err := pool.Acquire()
Expect(err).ToNot(HaveOccurred())
}
_, err := pool.Acquire()
Expect(err).To(HaveOccurred())
})
})
})
Describe("removing", func() {
It("acquires a specific network from the pool", func() {
_, ipNet, err := net.ParseCIDR("10.254.0.0/30")
Expect(err).ToNot(HaveOccurred())
err = pool.Remove(network.New(ipNet))
Expect(err).ToNot(HaveOccurred())
for i := 0; i < (256 - 1); i++ {
network, err := pool.Acquire()
Expect(err).ToNot(HaveOccurred())
Expect(network.String()).ToNot(Equal("10.254.0.0/30"))
}
_, err = pool.Acquire()
Expect(err).To(HaveOccurred())
})
Context("when the resource is already acquired", func() {
It("returns a PortTakenError", func() {
network, err := pool.Acquire()
})
Describe("restoring", func() {
var snapshot io.Reader
var restoredNetwork *network.Network
BeforeEach(func() {
buf := new(bytes.Buffer)
snapshot = buf
_, ipNet, err := net.ParseCIDR("10.244.0.0/30")
Expect(err).ToNot(HaveOccurred())
restoredNetwork = network.New(ipNet)
err = json.NewEncoder(buf).Encode(
linux_backend.ContainerSnapshot{
ID: "some-restored-id",
Handle: "some-restored-handle",
GraceTime: 1 * time.Second,
State: "some-restored-state",
Events: []string{
"some-restored-event",
"some-other-restored-event",
},
Resources: linux_backend.ResourcesSnapshot{