azure-container-networking/ipam/azure_test.go

// Copyright 2017 Microsoft. All rights reserved.
// MIT License

package ipam

import (
	"encoding/json"
	"net/http"
	"net/url"
	"testing"
	"time"

	"github.com/Azure/azure-container-networking/common"
	cniTypesCurr "github.com/containernetworking/cni/pkg/types/100"
	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"
)

var (
	ipamQueryUrl      = "localhost:42424"
	ipamQueryResponse = "" +
		"<Interfaces>" +
		"	<Interface MacAddress=\"*\" IsPrimary=\"true\">" +
		"		<IPSubnet Prefix=\"10.0.0.0/16\">" +
		"			<IPAddress Address=\"10.0.0.4\" IsPrimary=\"true\"/>" +
		"			<IPAddress Address=\"10.0.0.5\" IsPrimary=\"false\"/>" +
		"		</IPSubnet>" +
		"		<IPSubnet Prefix=\"10.1.0.0/16\">" +
		"			<IPAddress Address=\"10.1.0.4\" IsPrimary=\"false\"/>" +
		"		</IPSubnet>" +
		"	</Interface>" +
		"</Interfaces>"
)

// Handles queries from IPAM source.
func handleIpamQuery(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte(ipamQueryResponse))
}

func parseResult(stdinData []byte) (*cniTypesCurr.Result, error) {
	result := &cniTypesCurr.Result{}
	if err := json.Unmarshal(stdinData, result); err != nil {
		return nil, err
	}
	return result, nil
}

func TestAzure(t *testing.T) {
	RegisterFailHandler(Fail)
	RunSpecs(t, "Azure source Suite")
}

var _ = Describe("Test azure source", func() {
	var (
		testAgent *common.Listener
		source    *azureSource
		err       error
	)

	BeforeSuite(func() {
		// Create a fake local agent to handle requests from IPAM plugin.
		u, _ := url.Parse("tcp://" + ipamQueryUrl)
		testAgent, err = common.NewListener(u)
		Expect(err).NotTo(HaveOccurred())

		testAgent.AddHandler("/", handleIpamQuery)

		err = testAgent.Start(make(chan error, 1))
		Expect(err).NotTo(HaveOccurred())
	})

	AfterSuite(func() {
		// Cleanup.
		testAgent.Stop()
	})

	Describe("Test create Azure source", func() {
		Context("When create new azure source with empty options", func() {
			It("Should return as default", func() {
				options := make(map[string]interface{})
				source, err = newAzureSource(options)
				Expect(err).ShouldNot(HaveOccurred())
				Expect(source.name).Should(Equal("Azure"))
				Expect(source.queryUrl).Should(Equal(azureQueryUrl))
				Expect(source.queryInterval).Should(Equal(azureQueryInterval))
			})
		})

		Context("When create new azure source with options", func() {
			It("Should return with default queryInterval", func() {
				options := make(map[string]interface{})
				second := 7
				queryInterval := time.Duration(second) * time.Second
				queryUrl := "http://testqueryurl:12121/test"
				options[common.OptIpamQueryInterval] = second
				options[common.OptIpamQueryUrl] = queryUrl
				source, err = newAzureSource(options)
				Expect(err).ShouldNot(HaveOccurred())
				Expect(source.name).Should(Equal("Azure"))
				Expect(source.queryUrl).Should(Equal(queryUrl))
				Expect(source.queryInterval).Should(Equal(queryInterval))
			})
		})
	})

	Describe("Test Azure source refresh", func() {
		Context("Create source for testing refresh", func() {
			It("Should create successfully", func() {
				options := make(map[string]interface{})
				options[common.OptEnvironment] = common.OptEnvironmentAzure
				options[common.OptAPIServerURL] = "null"
				options[common.OptIpamQueryUrl] = "http://" + ipamQueryUrl
				source, err = newAzureSource(options)
				Expect(err).ShouldNot(HaveOccurred())
				Expect(source.name).Should(Equal("Azure"))
				Expect(source.queryUrl).Should(Equal("http://" + ipamQueryUrl))
				Expect(source.queryInterval).Should(Equal(azureQueryInterval))
			})
		})

		Context("When refresh interval is too short", func() {
			It("Skip refresh and return nil", func() {
				source.lastRefresh = time.Now()
				source.queryInterval = time.Hour
				err = source.refresh()
				Expect(err).To(BeNil())
				source.queryInterval = time.Nanosecond
			})
		})

		Context("When newAddressSpace err", func() {
			It("Exit with error when refresh", func() {
				sink := &addressManagerMock{
					newAddressSpaceSuccess: false,
					setAddressSpaceSuccess: true,
				}
				err = source.start(sink)
				Expect(err).NotTo(HaveOccurred())
				Expect(source.sink).NotTo(BeNil())
				// this is to avoid a race condition that fails this test
				// source.queryInterval defaults to 1 nanosecond
				// if this test moves fast enough, it will have the refresh method
				// return on this check if time.Since(s.lastRefresh) < s.queryInterval

				source.lastRefresh = time.Now().Add(-1 * time.Second)
				err = source.refresh()
				Expect(err).To(HaveOccurred())
			})
		})

		Context("When setAddressSpace err", func() {
			It("Exit with error when refresh", func() {
				sink := &addressManagerMock{
					newAddressSpaceSuccess: true,
					setAddressSpaceSuccess: false,
				}
				err = source.start(sink)
				Expect(err).NotTo(HaveOccurred())
				Expect(source.sink).NotTo(BeNil())

				// this is to avoid a race condition that fails this test
				// source.queryInterval defaults to 1 nanosecond
				// if this test moves fast enough, it will have the refresh method
				// return on this check if time.Since(s.lastRefresh) < s.queryInterval

				source.lastRefresh = time.Now().Add(-1 * time.Second)

				err = source.refresh()
				Expect(err).To(HaveOccurred())
			})
		})

		Context("When create new azure source with options", func() {
			It("Should return with default queryInterval", func() {
				options := make(map[string]interface{})
				options[common.OptEnvironment] = common.OptEnvironmentAzure
				options[common.OptAPIServerURL] = "null"
				options[common.OptIpamQueryUrl] = "http://" + ipamQueryUrl

				am, err := createAddressManager(options)
				Expect(err).ToNot(HaveOccurred())

				amImpl := am.(*addressManager)

				err = amImpl.source.refresh()
				Expect(err).ToNot(HaveOccurred())

				as, ok := amImpl.AddrSpaces["local"]
				Expect(ok).To(BeTrue())

				pool, ok := as.Pools["10.0.0.0/16"]
				Expect(ok).To(BeTrue())

				_, ok = pool.Addresses["10.0.0.4"]
				Expect(ok).NotTo(BeTrue())

				_, ok = pool.Addresses["10.0.0.5"]
				Expect(ok).To(BeTrue())

				_, ok = pool.Addresses["10.1.0.4"]
				Expect(ok).NotTo(BeTrue())

				pool, ok = as.Pools["10.1.0.0/16"]
				Expect(ok).To(BeTrue())

				_, ok = pool.Addresses["10.1.0.4"]
				Expect(ok).To(BeTrue())
			})
		})
	})
})