// Copyright (c) 2017-2021 Tigera, Inc. All rights reserved.

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package felixsyncer_test

import (
	"context"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/tools/clientcmd"

	apiv3 "github.com/projectcalico/api/pkg/apis/projectcalico/v3"
	"github.com/projectcalico/api/pkg/lib/numorstring"

	"github.com/projectcalico/calico/libcalico-go/lib/apiconfig"
	libapiv3 "github.com/projectcalico/calico/libcalico-go/lib/apis/v3"
	"github.com/projectcalico/calico/libcalico-go/lib/backend"
	"github.com/projectcalico/calico/libcalico-go/lib/backend/api"
	"github.com/projectcalico/calico/libcalico-go/lib/backend/encap"
	"github.com/projectcalico/calico/libcalico-go/lib/backend/k8s/conversion"
	resources2 "github.com/projectcalico/calico/libcalico-go/lib/backend/k8s/resources"
	"github.com/projectcalico/calico/libcalico-go/lib/backend/model"
	"github.com/projectcalico/calico/libcalico-go/lib/backend/syncersv1/felixsyncer"
	"github.com/projectcalico/calico/libcalico-go/lib/clientv3"
	"github.com/projectcalico/calico/libcalico-go/lib/ipam"
	"github.com/projectcalico/calico/libcalico-go/lib/net"
	"github.com/projectcalico/calico/libcalico-go/lib/options"
	"github.com/projectcalico/calico/libcalico-go/lib/resources"
	"github.com/projectcalico/calico/libcalico-go/lib/testutils"
)

// calculateDefaultFelixSyncerEntries determines the expected set of Felix configuration for the currently configured
// cluster.
func calculateDefaultFelixSyncerEntries(cs kubernetes.Interface, dt apiconfig.DatastoreType) (expected []model.KVPair) {
	// Add 2 for the default-allow profile that is always there.
	// However, no profile labels are in the list because the
	// default-allow profile doesn't specify labels.
	expectedProfile := resources.DefaultAllowProfile()
	expected = append(expected, *expectedProfile)
	expected = append(expected, model.KVPair{
		Key: model.ProfileRulesKey{ProfileKey: model.ProfileKey{Name: "projectcalico-default-allow"}},
		Value: &model.ProfileRules{
			InboundRules:  []model.Rule{{Action: "allow"}},
			OutboundRules: []model.Rule{{Action: "allow"}},
		},
	})

	if dt == apiconfig.Kubernetes {
		// Grab the k8s converter (we use this for converting some of the resources below).
		converter := conversion.NewConverter()

		// Add one for each node resource.
		nodes, err := cs.CoreV1().Nodes().List(context.Background(), metav1.ListOptions{})
		Expect(err).NotTo(HaveOccurred())
		for _, node := range nodes.Items {
			// Nodes get updated frequently, so don't include the revision info.
			node.ResourceVersion = ""
			cnodekv, err := resources2.K8sNodeToCalico(&node, false)
			Expect(err).NotTo(HaveOccurred())
			expected = append(expected, *cnodekv)

			if node.Name == "kind-control-plane" {
				for _, ip := range cnodekv.Value.(*libapiv3.Node).Spec.Addresses {
					if ip.Type == libapiv3.InternalIP {
						expected = append(expected, model.KVPair{
							Key: model.HostIPKey{
								Hostname: node.Name,
							},
							Value: net.ParseIP(ip.Address),
						})
					}
				}
			}
		}

		// Add endpoint slices.
		epss, err := cs.DiscoveryV1beta1().EndpointSlices("").List(context.Background(), metav1.ListOptions{})
		Expect(err).NotTo(HaveOccurred())
		for _, eps := range epss.Items {
			// Endpoints slices get updated frequently, so don't include the revision info.
			eps.ResourceVersion = ""
			epskv, err := converter.EndpointSliceToKVP(&eps)
			Expect(err).NotTo(HaveOccurred())
			expected = append(expected, *epskv)
		}

		// Add resources for the namespaces we expect in the cluster.
		namespaces, err := cs.CoreV1().Namespaces().List(context.Background(), metav1.ListOptions{})
		Expect(err).NotTo(HaveOccurred())
		for _, ns := range namespaces.Items {
			name := "kns." + ns.Name

			// Expect profile rules for each namespace providing default allow behavior.
			expected = append(expected, model.KVPair{
				Key: model.ProfileRulesKey{ProfileKey: model.ProfileKey{Name: name}},
				Value: &model.ProfileRules{
					InboundRules:  []model.Rule{{Action: "allow"}},
					OutboundRules: []model.Rule{{Action: "allow"}},
				},
			})

			// Expect profile labels for each namespace as well. The labels should include the name
			// of the namespace. As of Kubernetes v1.21, k8s also includes a label for the namespace name
			// that will be inherited by the profile.
			expected = append(expected, model.KVPair{
				Key: model.ProfileLabelsKey{ProfileKey: model.ProfileKey{Name: name}},
				Value: map[string]string{
					"pcns.projectcalico.org/name":      ns.Name,
					"pcns.kubernetes.io/metadata.name": ns.Name,
				},
			})

			// And expect a v3 profile for each namespace.
			prof := apiv3.Profile{
				TypeMeta:   metav1.TypeMeta{Kind: "Profile", APIVersion: "projectcalico.org/v3"},
				ObjectMeta: metav1.ObjectMeta{Name: name, UID: ns.UID, CreationTimestamp: ns.CreationTimestamp},
				Spec: apiv3.ProfileSpec{
					LabelsToApply: map[string]string{
						"pcns.projectcalico.org/name":      ns.Name,
						"pcns.kubernetes.io/metadata.name": ns.Name,
					},
					Ingress: []apiv3.Rule{{Action: apiv3.Allow}},
					Egress:  []apiv3.Rule{{Action: apiv3.Allow}},
				},
			}
			expected = append(expected, model.KVPair{
				Key:   model.ResourceKey{Kind: "Profile", Name: name},
				Value: &prof,
			})

			serviceAccounts, err := cs.CoreV1().ServiceAccounts(ns.Name).List(context.Background(), metav1.ListOptions{})
			Expect(err).NotTo(HaveOccurred())
			for _, sa := range serviceAccounts.Items {
				name := "ksa." + ns.Name + "." + sa.Name

				// Expect profile rules for the serviceaccounts in each namespace.
				expected = append(expected, model.KVPair{
					Key: model.ProfileRulesKey{ProfileKey: model.ProfileKey{Name: name}},
					Value: &model.ProfileRules{
						InboundRules:  nil,
						OutboundRules: nil,
					},
				})

				// Expect profile labels for each default serviceaccount as well. The labels should include the name
				// of the service account.
				expected = append(expected, model.KVPair{
					Key: model.ProfileLabelsKey{ProfileKey: model.ProfileKey{Name: name}},
					Value: map[string]string{
						"pcsa.projectcalico.org/name": sa.Name,
					},
				})

				//  We also expect one v3 Profile to be present for each ServiceAccount.
				prof := apiv3.Profile{
					TypeMeta:   metav1.TypeMeta{Kind: "Profile", APIVersion: "projectcalico.org/v3"},
					ObjectMeta: metav1.ObjectMeta{Name: name, UID: sa.UID, CreationTimestamp: sa.CreationTimestamp},
					Spec: apiv3.ProfileSpec{
						LabelsToApply: map[string]string{
							"pcsa.projectcalico.org/name": sa.Name,
						},
					},
				}
				expected = append(expected, model.KVPair{
					Key:   model.ResourceKey{Kind: "Profile", Name: name},
					Value: &prof,
				})
			}
		}
	}

	return
}

var _ = testutils.E2eDatastoreDescribe("Felix syncer tests", testutils.DatastoreAll, func(config apiconfig.CalicoAPIConfig) {

	var ctx context.Context
	var c clientv3.Interface
	var be api.Client
	var syncTester *testutils.SyncerTester
	var err error
	var datamodelCleanups []func()
	var cs kubernetes.Interface

	addCleanup := func(cleanup func()) {
		datamodelCleanups = append(datamodelCleanups, cleanup)
	}

	BeforeEach(func() {
		ctx = context.Background()
		// Create a v3 client to drive data changes (luckily because this is the _test module,
		// we don't get circular imports.
		c, err = clientv3.New(config)
		Expect(err).NotTo(HaveOccurred())

		// Create the backend client to obtain a syncer interface.
		be, err = backend.NewClient(config)
		Expect(err).NotTo(HaveOccurred())
		be.Clean()

		// build k8s clientset.
		cfg, err := clientcmd.BuildConfigFromFlags("", "/kubeconfig.yaml")
		Expect(err).NotTo(HaveOccurred())
		cs = kubernetes.NewForConfigOrDie(cfg)

		// Create a SyncerTester to receive the BGP syncer callback events and to allow us
		// to assert state.
		syncTester = testutils.NewSyncerTester()

		datamodelCleanups = nil
	})

	AfterEach(func() {
		for _, cleanup := range datamodelCleanups {
			cleanup()
		}
	})

	Describe("Felix syncer functionality", func() {
		It("should receive the synced after return all current data", func() {
			syncer := felixsyncer.New(be, config.Spec, syncTester, true)
			syncer.Start()
			expectedCacheSize := 0

			By("Checking status is updated to sync'd at start of day")
			syncTester.ExpectStatusUpdate(api.WaitForDatastore)
			syncTester.ExpectCacheSize(expectedCacheSize)
			syncTester.ExpectStatusUpdate(api.ResyncInProgress)
			syncTester.ExpectStatusUpdate(api.InSync)

			By("Checking updates match those expected.")
			defaultCacheEntries := calculateDefaultFelixSyncerEntries(cs, config.Spec.DatastoreType)
			expectedCacheSize += len(defaultCacheEntries)
			for _, r := range defaultCacheEntries {
				// Expect the correct cache values.
				syncTester.ExpectData(r)
			}

			// Expect the correct updates - should have a new entry for each of these entries. Note that we don't do
			// any more update checks below because we filter out host related updates since they are chatty outside
			// of our control (and a lot of the tests below are focussed on host data), instead the tests below will
			// just check the final cache entry.
			var expectedEvents []api.Update
			for _, r := range defaultCacheEntries {
				expectedEvents = append(expectedEvents, api.Update{
					KVPair:     r,
					UpdateType: api.UpdateTypeKVNew,
				})
			}
			syncTester.ExpectUpdates(expectedEvents, false)
			Expect(err).NotTo(HaveOccurred())

			// Verify our cache size is correct.
			syncTester.ExpectCacheSize(expectedCacheSize)

			var node *libapiv3.Node
			wip := net.MustParseIP("192.168.12.34")
			if config.Spec.DatastoreType == apiconfig.Kubernetes {
				// For Kubernetes, update the existing node config to have some BGP configuration.
				By("Configuring a node with an IP address and tunnel MAC address")
				var (
					oldValuesSaved        bool
					oldBGPSpec            *libapiv3.NodeBGPSpec
					oldVXLANTunnelMACAddr string
					oldWireguardSpec      *libapiv3.NodeWireguardSpec
					oldWireguardPublicKey string
				)
				for i := 0; i < 5; i++ {
					// This can fail due to an update conflict, so we allow a few retries.
					node, err = c.Nodes().Get(ctx, "127.0.0.1", options.GetOptions{})
					Expect(err).NotTo(HaveOccurred())
					if !oldValuesSaved {
						if node.Spec.BGP == nil {
							oldBGPSpec = nil
						} else {
							bgpSpecCopy := *node.Spec.BGP
							oldBGPSpec = &bgpSpecCopy
						}
						oldVXLANTunnelMACAddr = node.Spec.VXLANTunnelMACAddr
						if node.Spec.Wireguard == nil {
							oldWireguardSpec = nil
						} else {
							wireguardSpecCopy := *node.Spec.Wireguard
							oldWireguardSpec = &wireguardSpecCopy
						}
						oldWireguardPublicKey = node.Status.WireguardPublicKey
						oldValuesSaved = true
					}
					node.Spec.BGP = &libapiv3.NodeBGPSpec{
						IPv4Address:        "1.2.3.4/24",
						IPv6Address:        "aa:bb::cc/120",
						IPv4IPIPTunnelAddr: "192.168.0.1",
					}
					node.Spec.VXLANTunnelMACAddr = "66:cf:23:df:22:07"
					node.Spec.Wireguard = &libapiv3.NodeWireguardSpec{
						InterfaceIPv4Address: "192.168.12.34",
					}
					node.Status = libapiv3.NodeStatus{
						WireguardPublicKey: "jlkVyQYooZYzI2wFfNhSZez5eWh44yfq1wKVjLvSXgY=",
					}
					node, err = c.Nodes().Update(ctx, node, options.SetOptions{})
					if err == nil {
						break
					}
				}
				Expect(err).NotTo(HaveOccurred())
				addCleanup(func() {
					for i := 0; i < 5; i++ {
						// This can fail due to an update conflict, so we allow a few retries.
						node, err = c.Nodes().Get(ctx, "127.0.0.1", options.GetOptions{})
						Expect(err).NotTo(HaveOccurred())
						node.Spec.BGP = oldBGPSpec
						node.Spec.VXLANTunnelMACAddr = oldVXLANTunnelMACAddr
						node.Spec.Wireguard = oldWireguardSpec
						node.Status.WireguardPublicKey = oldWireguardPublicKey
						node, err = c.Nodes().Update(ctx, node, options.SetOptions{})
						if err == nil {
							break
						}
					}
					Expect(err).NotTo(HaveOccurred())
				})
				syncTester.ExpectData(model.KVPair{
					Key:   model.HostConfigKey{Hostname: "127.0.0.1", Name: "IpInIpTunnelAddr"},
					Value: "192.168.0.1",
				})
				syncTester.ExpectData(model.KVPair{
					Key:   model.HostConfigKey{Hostname: "127.0.0.1", Name: "VXLANTunnelMACAddr"},
					Value: "66:cf:23:df:22:07",
				})
				syncTester.ExpectData(model.KVPair{
					Key:   model.WireguardKey{NodeName: "127.0.0.1"},
					Value: &model.Wireguard{InterfaceIPv4Addr: &wip, PublicKey: "jlkVyQYooZYzI2wFfNhSZez5eWh44yfq1wKVjLvSXgY="},
				})
				expectedCacheSize += 3
			} else {
				// For non-Kubernetes, add a new node with valid BGP configuration.
				By("Creating a node with an IP address")
				node, err = c.Nodes().Create(
					ctx,
					&libapiv3.Node{
						ObjectMeta: metav1.ObjectMeta{Name: "127.0.0.1"},
						Spec: libapiv3.NodeSpec{
							BGP: &libapiv3.NodeBGPSpec{
								IPv4Address:        "1.2.3.4/24",
								IPv6Address:        "aa:bb::cc/120",
								IPv4IPIPTunnelAddr: "192.168.0.1",
							},
							VXLANTunnelMACAddr: "66:cf:23:df:22:07",
							Wireguard: &libapiv3.NodeWireguardSpec{
								InterfaceIPv4Address: "192.168.12.34",
							},
						},
						Status: libapiv3.NodeStatus{
							WireguardPublicKey: "jlkVyQYooZYzI2wFfNhSZez5eWh44yfq1wKVjLvSXgY=",
						},
					},
					options.SetOptions{},
				)
				Expect(err).NotTo(HaveOccurred())

				// Creating the node initialises the ClusterInformation as a side effect.
				syncTester.ExpectData(model.KVPair{
					Key:   model.ReadyFlagKey{},
					Value: true,
				})
				syncTester.ExpectValueMatches(
					model.GlobalConfigKey{Name: "ClusterGUID"},
					MatchRegexp("[a-f0-9]{32}"),
				)
				syncTester.ExpectData(model.KVPair{
					Key:   model.HostConfigKey{Hostname: "127.0.0.1", Name: "IpInIpTunnelAddr"},
					Value: "192.168.0.1",
				})
				syncTester.ExpectData(model.KVPair{
					Key:   model.HostConfigKey{Hostname: "127.0.0.1", Name: "VXLANTunnelMACAddr"},
					Value: "66:cf:23:df:22:07",
				})
				syncTester.ExpectData(model.KVPair{
					Key:   model.HostConfigKey{Hostname: "127.0.0.1", Name: "VXLANTunnelMACAddr"},
					Value: "66:cf:23:df:22:07",
				})
				syncTester.ExpectData(model.KVPair{
					Key:   model.WireguardKey{NodeName: "127.0.0.1"},
					Value: &model.Wireguard{InterfaceIPv4Addr: &wip, PublicKey: "jlkVyQYooZYzI2wFfNhSZez5eWh44yfq1wKVjLvSXgY="},
				})
				//add one for the node resource
				expectedCacheSize += 6
			}

			// The HostIP will be added for the IPv4 address
			expectedCacheSize += 1
			ip := net.MustParseIP("1.2.3.4")
			syncTester.ExpectData(model.KVPair{
				Key:   model.HostIPKey{Hostname: "127.0.0.1"},
				Value: &ip,
			})
			syncTester.ExpectCacheSize(expectedCacheSize)

			By("Creating an IPPool")
			poolCIDR := "192.124.0.0/21"
			poolCIDRNet := net.MustParseCIDR(poolCIDR)
			pool, err := c.IPPools().Create(
				ctx,
				&apiv3.IPPool{
					ObjectMeta: metav1.ObjectMeta{Name: "mypool"},
					Spec: apiv3.IPPoolSpec{
						CIDR:        poolCIDR,
						IPIPMode:    apiv3.IPIPModeCrossSubnet,
						NATOutgoing: true,
						BlockSize:   30,
					},
				},
				options.SetOptions{},
			)
			Expect(err).NotTo(HaveOccurred())
			// The pool will add as single entry ( +1 ), plus will also create the default
			// Felix config with IPIP enabled.
			expectedCacheSize += 2
			syncTester.ExpectData(model.KVPair{
				Key: model.IPPoolKey{CIDR: net.MustParseCIDR("192.124.0.0/21")},
				Value: &model.IPPool{
					CIDR:          poolCIDRNet,
					IPIPInterface: "tunl0",
					IPIPMode:      encap.CrossSubnet,
					Masquerade:    true,
					IPAM:          true,
					Disabled:      false,
				},
				Revision: pool.ResourceVersion,
			})
			syncTester.ExpectData(model.KVPair{
				Key:   model.GlobalConfigKey{"IpInIpEnabled"},
				Value: "true",
			})
			syncTester.ExpectCacheSize(expectedCacheSize)

			By("Creating a GlobalNetworkSet")
			gns := apiv3.NewGlobalNetworkSet()
			gns.Name = "anetworkset"
			gns.Labels = map[string]string{
				"a": "b",
			}
			gns.Spec.Nets = []string{
				"11.0.0.0/16",
			}
			gns, err = c.GlobalNetworkSets().Create(
				ctx,
				gns,
				options.SetOptions{},
			)
			expectedCacheSize++
			_, expGNet, err := net.ParseCIDROrIP("11.0.0.0/16")
			Expect(err).NotTo(HaveOccurred())
			syncTester.ExpectData(model.KVPair{
				Key: model.NetworkSetKey{Name: "anetworkset"},
				Value: &model.NetworkSet{
					Labels: map[string]string{
						"a": "b",
					},
					Nets: []net.IPNet{
						*expGNet,
					},
				},
				Revision: gns.ResourceVersion,
			})
			syncTester.ExpectCacheSize(expectedCacheSize)

			By("Creating a NetworkSet")
			ns := apiv3.NewNetworkSet()
			ns.Name = "anetworkset"
			ns.Namespace = "namespace-1"
			ns.Labels = map[string]string{
				"a": "b",
			}
			ns.Spec.Nets = []string{
				"11.0.0.0/16",
			}
			ns, err = c.NetworkSets().Create(
				ctx,
				ns,
				options.SetOptions{},
			)
			expectedCacheSize++

			_, expNet, err := net.ParseCIDROrIP("11.0.0.0/16")
			Expect(err).NotTo(HaveOccurred())
			syncTester.ExpectData(model.KVPair{
				Key: model.NetworkSetKey{Name: "namespace-1/anetworkset"},
				Value: &model.NetworkSet{
					Labels: map[string]string{
						"a":                           "b",
						"projectcalico.org/namespace": "namespace-1",
					},
					Nets: []net.IPNet{
						*expNet,
					},
					ProfileIDs: []string{
						"kns.namespace-1",
					},
				},
				Revision: ns.ResourceVersion,
			})
			syncTester.ExpectCacheSize(expectedCacheSize)

			By("Creating a HostEndpoint")
			hep, err := c.HostEndpoints().Create(
				ctx,
				&apiv3.HostEndpoint{
					ObjectMeta: metav1.ObjectMeta{
						Name: "hosta.eth0-a",
						Labels: map[string]string{
							"label1": "value1",
						},
					},
					Spec: apiv3.HostEndpointSpec{
						Node:          "127.0.0.1",
						InterfaceName: "eth0",
						ExpectedIPs:   []string{"1.2.3.4", "aa:bb::cc:dd"},
						Profiles:      []string{"profile1", "profile2"},
						Ports: []apiv3.EndpointPort{
							{
								Name:     "port1",
								Protocol: numorstring.ProtocolFromString("TCP"),
								Port:     1234,
							},
							{
								Name:     "port2",
								Protocol: numorstring.ProtocolFromString("UDP"),
								Port:     1010,
							},
						},
					},
				},
				options.SetOptions{},
			)
			Expect(err).NotTo(HaveOccurred())
			// The host endpoint will add as single entry ( +1 )
			expectedCacheSize += 1

			syncTester.ExpectData(model.KVPair{
				Key: model.HostEndpointKey{Hostname: "127.0.0.1", EndpointID: "hosta.eth0-a"},
				Value: &model.HostEndpoint{
					Name:              "eth0",
					ExpectedIPv4Addrs: []net.IP{net.MustParseIP("1.2.3.4")},
					ExpectedIPv6Addrs: []net.IP{net.MustParseIP("aa:bb::cc:dd")},
					Labels: map[string]string{
						"label1": "value1",
					},
					ProfileIDs: []string{"profile1", "profile2"},
					Ports: []model.EndpointPort{
						{
							Name:     "port1",
							Protocol: numorstring.ProtocolFromStringV1("TCP"),
							Port:     1234,
						},
						{
							Name:     "port2",
							Protocol: numorstring.ProtocolFromStringV1("UDP"),
							Port:     1010,
						},
					},
				},
				Revision: hep.ResourceVersion,
			})
			syncTester.ExpectCacheSize(expectedCacheSize)

			By("Allocating an IP")
			err = c.IPAM().AssignIP(ctx, ipam.AssignIPArgs{
				Hostname: "127.0.0.1",
				IP:       net.MustParseIP("192.124.0.1"),
			})
			Expect(err).NotTo(HaveOccurred())
			expectedCacheSize += 1

			_, cidr, _ := net.ParseCIDR("192.124.0.0/30")
			affinity := "host:127.0.0.1"
			zero := 0
			syncTester.ExpectData(model.KVPair{
				Key: model.BlockKey{CIDR: *cidr},
				Value: &model.AllocationBlock{
					CIDR:        *cidr,
					Affinity:    &affinity,
					Allocations: []*int{nil, &zero, nil, nil},
					Unallocated: []int{0, 2, 3},
					Attributes: []model.AllocationAttribute{
						{},
					},
				},
			})

			By("Starting a new syncer and verifying that all current entries are returned before sync status")
			// We need to create a new syncTester and syncer.
			current := syncTester.GetCacheEntries()
			syncTester = testutils.NewSyncerTester()
			syncer = felixsyncer.New(be, config.Spec, syncTester, true)
			syncer.Start()

			// Verify the data is the same as the data from the previous cache.  We got the cache in the previous
			// step.
			syncTester.ExpectStatusUpdate(api.WaitForDatastore)
			syncTester.ExpectStatusUpdate(api.ResyncInProgress)
			syncTester.ExpectCacheSize(len(current))
			for _, e := range current {
				syncTester.ExpectData(e)
			}
			syncTester.ExpectStatusUpdate(api.InSync)
		})
	})
})

var _ = testutils.E2eDatastoreDescribe("Felix syncer tests (KDD only)", testutils.DatastoreK8s, func(config apiconfig.CalicoAPIConfig) {
	var be api.Client
	var syncTester *testutils.SyncerTester
	var err error

	BeforeEach(func() {
		// Create the backend client to obtain a syncer interface.
		config.Spec.K8sUsePodCIDR = true
		be, err = backend.NewClient(config)
		Expect(err).NotTo(HaveOccurred())
		be.Clean()

		// Create a SyncerTester to receive the BGP syncer callback events and to allow us
		// to assert state.
		syncTester = testutils.NewSyncerTester()
	})

	It("should handle IPAM blocks properly for host-local IPAM", func() {
		config.Spec.K8sUsePodCIDR = true
		syncer := felixsyncer.New(be, config.Spec, syncTester, true)
		syncer.Start()

		// Verify we start a resync.
		syncTester.ExpectStatusUpdate(api.WaitForDatastore)
		syncTester.ExpectStatusUpdate(api.ResyncInProgress)

		// Expect a felix config for the IPIP tunnel address, generated from the podCIDR.
		syncTester.ExpectData(model.KVPair{
			Key:   model.HostConfigKey{Hostname: "127.0.0.1", Name: "IpInIpTunnelAddr"},
			Value: "192.168.0.1",
		})

		// Expect to be in-sync.
		syncTester.ExpectStatusUpdate(api.InSync)
	})
})

var _ = testutils.E2eDatastoreDescribe("Felix syncer tests (passive mode)", testutils.DatastoreK8s, func(config apiconfig.CalicoAPIConfig) {
	var be api.Client
	var syncTester *testutils.SyncerTester
	var err error
	var c clientv3.Interface

	BeforeEach(func() {
		// Create the backend client to obtain a syncer interface.
		be, err = backend.NewClient(config)
		Expect(err).NotTo(HaveOccurred())
		be.Clean()

		c, err = clientv3.New(config)
		Expect(err).NotTo(HaveOccurred())

		// Create a SyncerTester to receive the BGP syncer callback events and to allow us
		// to assert state.
		syncTester = testutils.NewSyncerTester()
	})

	It("should only receive config updates when in passive mode", func() {
		syncer := felixsyncer.New(be, config.Spec, syncTester, false)
		syncer.Start()

		// Verify we start a resync.
		syncTester.ExpectStatusUpdate(api.WaitForDatastore)
		syncTester.ExpectStatusUpdate(api.ResyncInProgress)

		// Expect to be in-sync.
		syncTester.ExpectStatusUpdate(api.InSync)

		// We don't expect any resources, since we're only watching config.
		syncTester.ExpectCacheSize(0)

		// Change the variant.
		ci := &apiv3.ClusterInformation{
			ObjectMeta: metav1.ObjectMeta{Name: "default"},
			Spec: apiv3.ClusterInformationSpec{
				Variant: "Calico",
			},
		}
		_, err = c.ClusterInformation().Create(context.Background(), ci, options.SetOptions{})
		Expect(err).NotTo(HaveOccurred())

		// Expect an update for the variant.
		syncTester.ExpectCacheSize(1)
		syncTester.ExpectValueMatches(
			model.GlobalConfigKey{Name: "Variant"},
			MatchRegexp("Calico"),
		)
	})
})
