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router_controller.go
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router_controller.go
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package controller
import (
"fmt"
"sync"
"time"
"github.com/golang/glog"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
utilwait "k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/apis/extensions"
routeapi "github.com/openshift/origin/pkg/route/apis/route"
"github.com/openshift/origin/pkg/router"
)
// NamespaceLister returns all the names that should be watched by the client
type NamespaceLister interface {
NamespaceNames() (sets.String, error)
}
// RouterController abstracts the details of watching resources like Routes, Endpoints, etc.
// used by the plugin implementation.
type RouterController struct {
lock sync.Mutex
Plugin router.Plugin
firstSyncDone bool
filteredByNamespace bool
Namespaces NamespaceLister
NamespaceSyncInterval time.Duration
NamespaceWaitInterval time.Duration
NamespaceRetries int
WatchNodes bool
EnableIngress bool
IngressTranslator *IngressTranslator
}
// Run begins watching and syncing.
func (c *RouterController) Run() {
glog.V(4).Info("Running router controller")
if c.Namespaces != nil {
c.HandleNamespaces()
go utilwait.Forever(c.HandleNamespaces, c.NamespaceSyncInterval)
}
c.handleFirstSync()
}
func (c *RouterController) HandleNamespaces() {
for i := 0; i < c.NamespaceRetries; i++ {
namespaces, err := c.Namespaces.NamespaceNames()
if err == nil {
// The ingress translator synchronizes access to its cache with a
// lock, so calls to it are made outside of the controller lock to
// avoid unintended interaction.
if c.EnableIngress {
c.IngressTranslator.UpdateNamespaces(namespaces)
}
c.lock.Lock()
defer c.lock.Unlock()
glog.V(4).Infof("Updating watched namespaces: %v", namespaces)
if err := c.Plugin.HandleNamespaces(namespaces); err != nil {
utilruntime.HandleError(err)
}
// Namespace filtering is assumed to be have been
// performed so long as the plugin event handler is called
// at least once.
c.filteredByNamespace = true
c.Commit()
return
}
utilruntime.HandleError(fmt.Errorf("unable to find namespaces for router: %v", err))
time.Sleep(c.NamespaceWaitInterval)
}
glog.V(4).Infof("Unable to update list of namespaces")
}
// HandleNode handles a single Node event and synchronizes the router backend
func (c *RouterController) HandleNode(eventType watch.EventType, obj interface{}) {
node := obj.(*kapi.Node)
c.lock.Lock()
defer c.lock.Unlock()
glog.V(4).Infof("Processing Node : %s", node.Name)
glog.V(4).Infof(" Event: %s", eventType)
if err := c.Plugin.HandleNode(eventType, node); err != nil {
utilruntime.HandleError(err)
}
}
// HandleRoute handles a single Route event and synchronizes the router backend.
func (c *RouterController) HandleRoute(eventType watch.EventType, obj interface{}) {
route := obj.(*routeapi.Route)
c.lock.Lock()
defer c.lock.Unlock()
c.processRoute(eventType, route)
c.Commit()
}
// HandleEndpoints handles a single Endpoints event and refreshes the router backend.
func (c *RouterController) HandleEndpoints(eventType watch.EventType, obj interface{}) {
endpoints := obj.(*kapi.Endpoints)
c.lock.Lock()
defer c.lock.Unlock()
if err := c.Plugin.HandleEndpoints(eventType, endpoints); err != nil {
utilruntime.HandleError(err)
}
c.Commit()
}
// HandleIngress handles a single Ingress event and synchronizes the router backend.
func (c *RouterController) HandleIngress(eventType watch.EventType, obj interface{}) {
ingress := obj.(*extensions.Ingress)
// The ingress translator synchronizes access to its cache with a
// lock, so calls to it are made outside of the controller lock to
// avoid unintended interaction.
events := c.IngressTranslator.TranslateIngressEvent(eventType, ingress)
c.lock.Lock()
defer c.lock.Unlock()
c.processIngressEvents(events)
c.Commit()
}
// HandleSecret handles a single Secret event and synchronizes the router backend.
func (c *RouterController) HandleSecret(eventType watch.EventType, obj interface{}) {
secret := obj.(*kapi.Secret)
// The ingress translator synchronizes access to its cache with a
// lock, so calls to it are made outside of the controller lock to
// avoid unintended interaction.
events := c.IngressTranslator.TranslateSecretEvent(eventType, secret)
c.lock.Lock()
defer c.lock.Unlock()
c.processIngressEvents(events)
c.Commit()
}
// Commit notifies the plugin that it is safe to commit state.
func (c *RouterController) Commit() {
if !c.isSyncing() {
if err := c.Plugin.Commit(); err != nil {
utilruntime.HandleError(err)
}
}
}
// processRoute logs and propagates a route event to the plugin
func (c *RouterController) processRoute(eventType watch.EventType, route *routeapi.Route) {
glog.V(4).Infof("Processing Route: %s/%s -> %s", route.Namespace, route.Name, route.Spec.To.Name)
glog.V(4).Infof(" Alias: %s", route.Spec.Host)
glog.V(4).Infof(" Path: %s", route.Spec.Path)
glog.V(4).Infof(" Event: %s", eventType)
if err := c.Plugin.HandleRoute(eventType, route); err != nil {
utilruntime.HandleError(err)
}
}
// processIngressEvents logs and propagates the route events resulting from an ingress or secret event
func (c *RouterController) processIngressEvents(events []ingressRouteEvents) {
for _, ingressEvent := range events {
glog.V(4).Infof("Processing Ingress %s", ingressEvent.ingressKey)
for _, routeEvent := range ingressEvent.routeEvents {
c.processRoute(routeEvent.eventType, routeEvent.route)
}
}
}
func (c *RouterController) handleFirstSync() {
c.lock.Lock()
defer c.lock.Unlock()
c.firstSyncDone = true
glog.V(4).Infof("Router first sync complete")
c.Commit()
}
func (c *RouterController) isSyncing() bool {
syncing := false
if !c.firstSyncDone {
syncing = true
} else if c.Namespaces != nil && !c.filteredByNamespace {
syncing = true
}
return syncing
}