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common.go
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common.go
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package plugin
import (
"fmt"
"net"
"reflect"
"strings"
"time"
"github.com/golang/glog"
osclient "github.com/openshift/origin/pkg/client"
osapi "github.com/openshift/origin/pkg/sdn/apis/network"
"github.com/openshift/origin/pkg/util/netutils"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
kerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apimachinery/pkg/watch"
kcache "k8s.io/client-go/tools/cache"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/apis/extensions"
kinternalinformers "k8s.io/kubernetes/pkg/client/informers/informers_generated/internalversion"
)
func hostSubnetToString(subnet *osapi.HostSubnet) string {
return fmt.Sprintf("%s (host: %q, ip: %q, subnet: %q)", subnet.Name, subnet.Host, subnet.HostIP, subnet.Subnet)
}
func clusterNetworkToString(n *osapi.ClusterNetwork) string {
return fmt.Sprintf("%s (network: %q, hostSubnetBits: %d, serviceNetwork: %q, pluginName: %q)", n.Name, n.Network, n.HostSubnetLength, n.ServiceNetwork, n.PluginName)
}
type NetworkInfo struct {
ClusterNetwork *net.IPNet
ServiceNetwork *net.IPNet
}
func parseNetworkInfo(clusterNetwork string, serviceNetwork string) (*NetworkInfo, error) {
cn, err := netutils.ParseCIDRMask(clusterNetwork)
if err != nil {
_, cn, err := net.ParseCIDR(clusterNetwork)
if err != nil {
return nil, fmt.Errorf("failed to parse ClusterNetwork CIDR %s: %v", clusterNetwork, err)
}
glog.Errorf("Configured clusterNetworkCIDR value %q is invalid; treating it as %q", clusterNetwork, cn.String())
}
sn, err := netutils.ParseCIDRMask(serviceNetwork)
if err != nil {
_, sn, err := net.ParseCIDR(serviceNetwork)
if err != nil {
return nil, fmt.Errorf("failed to parse ServiceNetwork CIDR %s: %v", serviceNetwork, err)
}
glog.Errorf("Configured serviceNetworkCIDR value %q is invalid; treating it as %q", serviceNetwork, sn.String())
}
return &NetworkInfo{
ClusterNetwork: cn,
ServiceNetwork: sn,
}, nil
}
func (ni *NetworkInfo) validateNodeIP(nodeIP string) error {
if nodeIP == "" || nodeIP == "127.0.0.1" {
return fmt.Errorf("invalid node IP %q", nodeIP)
}
// Ensure each node's NodeIP is not contained by the cluster network,
// which could cause a routing loop. (rhbz#1295486)
ipaddr := net.ParseIP(nodeIP)
if ipaddr == nil {
return fmt.Errorf("failed to parse node IP %s", nodeIP)
}
if ni.ClusterNetwork.Contains(ipaddr) {
return fmt.Errorf("node IP %s conflicts with cluster network %s", nodeIP, ni.ClusterNetwork.String())
}
if ni.ServiceNetwork.Contains(ipaddr) {
return fmt.Errorf("node IP %s conflicts with service network %s", nodeIP, ni.ServiceNetwork.String())
}
return nil
}
func (ni *NetworkInfo) checkHostNetworks(hostIPNets []*net.IPNet) error {
errList := []error{}
for _, ipNet := range hostIPNets {
if ipNet.Contains(ni.ClusterNetwork.IP) {
errList = append(errList, fmt.Errorf("cluster IP: %s conflicts with host network: %s", ni.ClusterNetwork.IP.String(), ipNet.String()))
}
if ni.ClusterNetwork.Contains(ipNet.IP) {
errList = append(errList, fmt.Errorf("host network with IP: %s conflicts with cluster network: %s", ipNet.IP.String(), ni.ClusterNetwork.String()))
}
if ipNet.Contains(ni.ServiceNetwork.IP) {
errList = append(errList, fmt.Errorf("service IP: %s conflicts with host network: %s", ni.ServiceNetwork.String(), ipNet.String()))
}
if ni.ServiceNetwork.Contains(ipNet.IP) {
errList = append(errList, fmt.Errorf("host network with IP: %s conflicts with service network: %s", ipNet.IP.String(), ni.ServiceNetwork.String()))
}
}
return kerrors.NewAggregate(errList)
}
func (ni *NetworkInfo) checkClusterObjects(subnets []osapi.HostSubnet, pods []kapi.Pod, services []kapi.Service) error {
var errList []error
for _, subnet := range subnets {
subnetIP, _, _ := net.ParseCIDR(subnet.Subnet)
if subnetIP == nil {
errList = append(errList, fmt.Errorf("failed to parse network address: %s", subnet.Subnet))
} else if !ni.ClusterNetwork.Contains(subnetIP) {
errList = append(errList, fmt.Errorf("existing node subnet: %s is not part of cluster network: %s", subnet.Subnet, ni.ClusterNetwork.String()))
}
if len(errList) >= 10 {
break
}
}
for _, pod := range pods {
if pod.Spec.SecurityContext != nil && pod.Spec.SecurityContext.HostNetwork {
continue
}
if pod.Status.PodIP != "" && !ni.ClusterNetwork.Contains(net.ParseIP(pod.Status.PodIP)) {
errList = append(errList, fmt.Errorf("existing pod %s:%s with IP %s is not part of cluster network %s", pod.Namespace, pod.Name, pod.Status.PodIP, ni.ClusterNetwork.String()))
if len(errList) >= 10 {
break
}
}
}
for _, svc := range services {
svcIP := net.ParseIP(svc.Spec.ClusterIP)
if svcIP != nil && !ni.ServiceNetwork.Contains(svcIP) {
errList = append(errList, fmt.Errorf("existing service %s:%s with IP %s is not part of service network %s", svc.Namespace, svc.Name, svc.Spec.ClusterIP, ni.ServiceNetwork.String()))
if len(errList) >= 10 {
break
}
}
}
if len(errList) >= 10 {
errList = append(errList, fmt.Errorf("too many errors... truncating"))
}
return kerrors.NewAggregate(errList)
}
func getNetworkInfo(osClient *osclient.Client) (*NetworkInfo, error) {
cn, err := osClient.ClusterNetwork().Get(osapi.ClusterNetworkDefault, metav1.GetOptions{})
if err != nil {
return nil, err
}
return parseNetworkInfo(cn.Network, cn.ServiceNetwork)
}
type ResourceName string
const (
Nodes ResourceName = "Nodes"
Namespaces ResourceName = "Namespaces"
NetNamespaces ResourceName = "NetNamespaces"
Services ResourceName = "Services"
HostSubnets ResourceName = "HostSubnets"
Pods ResourceName = "Pods"
EgressNetworkPolicies ResourceName = "EgressNetworkPolicies"
NetworkPolicies ResourceName = "NetworkPolicies"
)
func newEventQueue(client kcache.Getter, resourceName ResourceName, expectedType interface{}, namespace string) *EventQueue {
rn := strings.ToLower(string(resourceName))
lw := kcache.NewListWatchFromClient(client, rn, namespace, fields.Everything())
eventQueue := NewEventQueue(DeletionHandlingMetaNamespaceKeyFunc)
// Repopulate event queue every 30 mins
// Existing items in the event queue will have watch.Modified event type
kcache.NewReflector(lw, expectedType, eventQueue, 30*time.Minute).Run()
return eventQueue
}
// Run event queue for the given resource. The 'process' function is called
// repeatedly with each available cache.Delta that describes state changes
// to an object. If the process function returns an error queued changes
// for that object are dropped but processing continues with the next available
// object's cache.Deltas. The error is logged with call stack information.
//
// NOTE: this function will handle DeletedFinalStateUnknown delta objects
// automatically, which may not always be what you want since the now-deleted
// object may be stale.
func RunEventQueue(client kcache.Getter, resourceName ResourceName, process ProcessEventFunc) {
var expectedType interface{}
switch resourceName {
case HostSubnets:
expectedType = &osapi.HostSubnet{}
case NetNamespaces:
expectedType = &osapi.NetNamespace{}
case EgressNetworkPolicies:
expectedType = &osapi.EgressNetworkPolicy{}
case NetworkPolicies:
expectedType = &extensions.NetworkPolicy{}
default:
glog.Fatalf("Unknown resource %s during initialization of event queue", resourceName)
}
eventQueue := newEventQueue(client, resourceName, expectedType, metav1.NamespaceAll)
for {
eventQueue.Pop(process, expectedType)
}
}
// RegisterSharedInformerEventHandlers registers addOrUpdateFunc and delFunc event handlers with
// kubernetes shared informers for the given resource name.
func RegisterSharedInformerEventHandlers(kubeInformers kinternalinformers.SharedInformerFactory,
addOrUpdateFunc func(interface{}, interface{}, watch.EventType),
delFunc func(interface{}), resourceName ResourceName) {
var expectedObjType interface{}
var informer kcache.SharedIndexInformer
internalVersion := kubeInformers.Core().InternalVersion()
switch resourceName {
case Nodes:
informer = internalVersion.Nodes().Informer()
expectedObjType = &kapi.Node{}
case Namespaces:
informer = internalVersion.Namespaces().Informer()
expectedObjType = &kapi.Namespace{}
case Services:
informer = internalVersion.Services().Informer()
expectedObjType = &kapi.Service{}
case Pods:
informer = internalVersion.Pods().Informer()
expectedObjType = &kapi.Pod{}
default:
glog.Errorf("Unknown resource name: %s", resourceName)
return
}
informer.AddEventHandler(kcache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
addOrUpdateFunc(obj, nil, watch.Added)
},
UpdateFunc: func(old, cur interface{}) {
addOrUpdateFunc(cur, old, watch.Modified)
},
DeleteFunc: func(obj interface{}) {
if reflect.TypeOf(expectedObjType) != reflect.TypeOf(obj) {
tombstone, ok := obj.(kcache.DeletedFinalStateUnknown)
if !ok {
glog.Errorf("Couldn't get object from tombstone: %+v", obj)
return
}
obj = tombstone.Obj
if reflect.TypeOf(expectedObjType) != reflect.TypeOf(obj) {
glog.Errorf("Tombstone contained object that is not a %s: %+v", resourceName, obj)
return
}
}
delFunc(obj)
},
})
}