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Build backend config using the K8S endpoint resource.

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* Potentialy saves a network hop
* Ability to configure LB algothim (given some work to expose an
anotation etc...)
* K8s config Watch is triggered far less often
This commit is contained in:
Ed Robinson 2016-05-20 17:34:57 +01:00
parent b79535f369
commit e948a013cd
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GPG key ID: EC501FCA6421CCF0
4 changed files with 210 additions and 42 deletions
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55
provider/k8s/client.go
View file

@ -22,6 +22,7 @@ const (
type Client interface {
GetIngresses(predicate func(Ingress) bool) ([]Ingress, error)
GetServices(predicate func(Service) bool) ([]Service, error)
GetEndpoints(name, namespace string) (Endpoints, error)
WatchAll(stopCh <-chan bool) (chan interface{}, chan error, error)
}
@ -104,21 +105,26 @@ func (c *clientImpl) WatchServices(stopCh <-chan bool) (chan interface{}, chan e
return c.watch(getURL, stopCh)
}
// WatchEvents returns events in the cluster
func (c *clientImpl) WatchEvents(stopCh <-chan bool) (chan interface{}, chan error, error) {
getURL := c.endpointURL + APIEndpoint + "/events"
return c.watch(getURL, stopCh)
// GetEndpoints returns the named Endpoints
// Endpoints have the same name as the coresponding service
func (c *clientImpl) GetEndpoints(name, namespace string) (Endpoints, error) {
getURL := c.endpointURL + APIEndpoint + "/namespaces/" + namespace + "/endpoints/" + name
body, err := c.do(c.request(getURL))
if err != nil {
return Endpoints{}, fmt.Errorf("failed to create endpoints request: GET %q : %v", getURL, err)
}
var endpoints Endpoints
if err := json.Unmarshal(body, &endpoints); err != nil {
return Endpoints{}, fmt.Errorf("failed to decode endpoints resources: %v", err)
}
return endpoints, nil
}
// WatchPods returns pods in the cluster
func (c *clientImpl) WatchPods(stopCh <-chan bool) (chan interface{}, chan error, error) {
getURL := c.endpointURL + APIEndpoint + "/pods"
return c.watch(getURL, stopCh)
}
// WatchReplicationControllers returns ReplicationControllers in the cluster
func (c *clientImpl) WatchReplicationControllers(stopCh <-chan bool) (chan interface{}, chan error, error) {
getURL := c.endpointURL + APIEndpoint + "/replicationcontrollers"
// WatchEndpoints returns endpoints in the cluster
func (c *clientImpl) WatchEndpoints(stopCh <-chan bool) (chan interface{}, chan error, error) {
getURL := c.endpointURL + APIEndpoint + "/endpoints"
return c.watch(getURL, stopCh)
}
@ -137,13 +143,8 @@ func (c *clientImpl) WatchAll(stopCh <-chan bool) (chan interface{}, chan error,
if err != nil {
return watchCh, errCh, fmt.Errorf("failed to create watch: %v", err)
}
stopPods := make(chan bool)
chanPods, chanPodsErr, err := c.WatchPods(stopPods)
if err != nil {
return watchCh, errCh, fmt.Errorf("failed to create watch: %v", err)
}
stopReplicationControllers := make(chan bool)
chanReplicationControllers, chanReplicationControllersErr, err := c.WatchReplicationControllers(stopReplicationControllers)
stopEndpoints := make(chan bool)
chanEndpoints, chanEndpointsErr, err := c.WatchEndpoints(stopEndpoints)
if err != nil {
return watchCh, errCh, fmt.Errorf("failed to create watch: %v", err)
}
@ -152,32 +153,26 @@ func (c *clientImpl) WatchAll(stopCh <-chan bool) (chan interface{}, chan error,
defer close(errCh)
defer close(stopIngresses)
defer close(stopServices)
defer close(stopPods)
defer close(stopReplicationControllers)
defer close(stopEndpoints)
for {
select {
case <-stopCh:
stopIngresses <- true
stopServices <- true
stopPods <- true
stopReplicationControllers <- true
stopEndpoints <- true
return
case err := <-chanIngressesErr:
errCh <- err
case err := <-chanServicesErr:
errCh <- err
case err := <-chanPodsErr:
errCh <- err
case err := <-chanReplicationControllersErr:
case err := <-chanEndpointsErr:
errCh <- err
case event := <-chanIngresses:
watchCh <- event
case event := <-chanServices:
watchCh <- event
case event := <-chanPods:
watchCh <- event
case event := <-chanReplicationControllers:
case event := <-chanEndpoints:
watchCh <- event
}
}