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controller.go
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controller.go
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package controller
import (
"fmt"
"sync"
"time"
"github.com/golang/glog"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/util/sets"
"k8s.io/kubernetes/pkg/watch"
routeapi "github.com/openshift/origin/pkg/route/api"
"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 the Route and Endpoints
// resources from the Plugin implementation being used.
type RouterController struct {
lock sync.Mutex
Plugin router.Plugin
NextRoute func() (watch.EventType, *routeapi.Route, error)
NextEndpoints func() (watch.EventType, *kapi.Endpoints, error)
Namespaces NamespaceLister
NamespaceSyncInterval time.Duration
NamespaceWaitInterval time.Duration
NamespaceRetries int
}
// Run begins watching and syncing.
func (c *RouterController) Run() {
glog.V(4).Info("Running router controller")
if c.Namespaces != nil {
c.HandleNamespaces()
go util.Forever(c.HandleNamespaces, c.NamespaceSyncInterval)
}
go util.Forever(c.HandleRoute, 0)
go util.Forever(c.HandleEndpoints, 0)
}
func (c *RouterController) HandleNamespaces() {
for i := 0; i < c.NamespaceRetries; i++ {
namespaces, err := c.Namespaces.NamespaceNames()
if err == nil {
c.lock.Lock()
defer c.lock.Unlock()
glog.V(4).Infof("Updating watched namespaces: %v", namespaces)
if err := c.Plugin.HandleNamespaces(namespaces); err != nil {
util.HandleError(err)
}
return
}
util.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")
}
// HandleRoute handles a single Route event and synchronizes the router backend.
func (c *RouterController) HandleRoute() {
eventType, route, err := c.NextRoute()
if err != nil {
util.HandleError(fmt.Errorf("unable to read routes: %v", err))
return
}
c.lock.Lock()
defer c.lock.Unlock()
glog.V(4).Infof("Processing Route: %s", route.Spec.To.Name)
glog.V(4).Infof(" Alias: %s", route.Spec.Host)
glog.V(4).Infof(" Event: %s", eventType)
if err := c.Plugin.HandleRoute(eventType, route); err != nil {
util.HandleError(err)
}
}
// HandleEndpoints handles a single Endpoints event and refreshes the router backend.
func (c *RouterController) HandleEndpoints() {
eventType, endpoints, err := c.NextEndpoints()
if err != nil {
util.HandleError(fmt.Errorf("unable to read endpoints: %v", err))
return
}
c.lock.Lock()
defer c.lock.Unlock()
if err := c.Plugin.HandleEndpoints(eventType, endpoints); err != nil {
util.HandleError(err)
}
}