host-local: add some testcases for allocation idempotency

Signed-off-by: Bruce Ma <brucema19901024@gmail.com>

plugins/ipam/host-local/backend/allocator/allocator_test.go

@@ -221,14 +221,14 @@ var _ = Describe("host-local ip allocator", func() {
 		It("should not allocate the broadcast address", func() {
 			alloc := mkalloc()
 			for i := 2; i < 7; i++ {
-				res, err := alloc.Get("ID", "eth0", nil)
+				res, err := alloc.Get(fmt.Sprintf("ID%d", i), "eth0", nil)
 				Expect(err).ToNot(HaveOccurred())
 				s := fmt.Sprintf("192.168.1.%d/29", i)
 				Expect(s).To(Equal(res.Address.String()))
 				fmt.Fprintln(GinkgoWriter, "got ip", res.Address.String())
 			}
 
-			x, err := alloc.Get("ID", "eth0", nil)
+			x, err := alloc.Get("ID8", "eth0", nil)
 			fmt.Fprintln(GinkgoWriter, "got ip", x)
 			Expect(err).To(HaveOccurred())
 		})

plugins/ipam/host-local/host_local_test.go

@@ -250,6 +250,106 @@ var _ = Describe("host-local Operations", func() {
 		Expect(err).To(HaveOccurred())
 	})
 
+	It("repeat allocating addresses on specific interface for same container ID with ADD", func() {
+		const ifname string = "eth0"
+		const nspath string = "/some/where"
+
+		tmpDir, err := getTmpDir()
+		Expect(err).NotTo(HaveOccurred())
+		defer os.RemoveAll(tmpDir)
+
+		conf := fmt.Sprintf(`{
+		"cniVersion": "0.3.1",
+		"name": "mynet0",
+		"type": "ipvlan",
+		"master": "foo0",
+			"ipam": {
+				"type": "host-local",
+				"dataDir": "%s",
+				"ranges": [
+					[{ "subnet": "10.1.2.0/24" }]
+				]
+			}
+		}`, tmpDir)
+
+		args := &skel.CmdArgs{
+			ContainerID: "dummy",
+			Netns:       nspath,
+			IfName:      ifname,
+			StdinData:   []byte(conf),
+		}
+
+		args1 := &skel.CmdArgs{
+			ContainerID: "dummy1",
+			Netns:       nspath,
+			IfName:      ifname,
+			StdinData:   []byte(conf),
+		}
+
+		// Allocate the IP
+		r0, raw, err := testutils.CmdAddWithArgs(args, func() error {
+			return cmdAdd(args)
+		})
+		Expect(err).NotTo(HaveOccurred())
+		Expect(strings.Index(string(raw), "\"version\":")).Should(BeNumerically(">", 0))
+
+		result0, err := current.GetResult(r0)
+		Expect(err).NotTo(HaveOccurred())
+		Expect(len(result0.IPs)).Should(Equal(1))
+		Expect(result0.IPs[0].Address.String()).Should(Equal("10.1.2.2/24"))
+
+		// Allocate the IP with the same container ID
+		r1, raw, err := testutils.CmdAddWithArgs(args, func() error {
+			return cmdAdd(args)
+		})
+		Expect(err).NotTo(HaveOccurred())
+		Expect(strings.Index(string(raw), "\"version\":")).Should(BeNumerically(">", 0))
+
+		result1, err := current.GetResult(r1)
+		Expect(err).NotTo(HaveOccurred())
+		Expect(len(result1.IPs)).Should(Equal(1))
+		Expect(result1.IPs[0].Address.String()).Should(Equal("10.1.2.2/24"))
+
+		// Allocate the IP with the another container ID
+		r2, raw, err := testutils.CmdAddWithArgs(args1, func() error {
+			return cmdAdd(args1)
+		})
+		Expect(err).NotTo(HaveOccurred())
+		Expect(strings.Index(string(raw), "\"version\":")).Should(BeNumerically(">", 0))
+
+		result2, err := current.GetResult(r2)
+		Expect(err).NotTo(HaveOccurred())
+		Expect(len(result2.IPs)).Should(Equal(1))
+		Expect(result2.IPs[0].Address.String()).Should(Equal("10.1.2.3/24"))
+
+		// Allocate the IP with the same container ID again
+		r3, raw, err := testutils.CmdAddWithArgs(args, func() error {
+			return cmdAdd(args)
+		})
+		Expect(err).NotTo(HaveOccurred())
+		Expect(strings.Index(string(raw), "\"version\":")).Should(BeNumerically(">", 0))
+
+		result3, err := current.GetResult(r3)
+		Expect(err).NotTo(HaveOccurred())
+		Expect(len(result3.IPs)).Should(Equal(1))
+		Expect(result3.IPs[0].Address.String()).Should(Equal("10.1.2.2/24"))
+
+		ipFilePath := filepath.Join(tmpDir, "mynet0", "10.1.2.2")
+
+		// Release the IPs
+		err = testutils.CmdDelWithArgs(args, func() error {
+			return cmdDel(args)
+		})
+		Expect(err).NotTo(HaveOccurred())
+		_, err = os.Stat(ipFilePath)
+		Expect(err).To(HaveOccurred())
+
+		err = testutils.CmdDelWithArgs(args1, func() error {
+			return cmdDel(args1)
+		})
+		Expect(err).NotTo(HaveOccurred())
+	})
+
 	It("Verify DEL works on backwards compatible allocate", func() {
 		const nspath string = "/some/where"
 		const ifname string = "eth0"