Fix Kubernetes watch leak

Signed-off-by: Emile Vauge <emile@vauge.com>

provider/k8s/client.go

@@ -1,6 +1,7 @@
 package k8s
 
 import (
+	"context"
 	"crypto/tls"
 	"crypto/x509"
 	"encoding/json"
@@ -141,20 +142,20 @@ func (c *clientImpl) WatchEndpoints(stopCh <-chan bool) (chan interface{}, chan
 
 // WatchAll returns events in the cluster
 func (c *clientImpl) WatchAll(labelSelector string, stopCh <-chan bool) (chan interface{}, chan error, error) {
-	watchCh := make(chan interface{}, 10)
-	errCh := make(chan error, 10)
+	watchCh := make(chan interface{}, 100)
+	errCh := make(chan error, 100)
 
-	stopIngresses := make(chan bool)
+	stopIngresses := make(chan bool, 10)
 	chanIngresses, chanIngressesErr, err := c.WatchIngresses(labelSelector, stopIngresses)
 	if err != nil {
 		return watchCh, errCh, fmt.Errorf("failed to create watch: %v", err)
 	}
-	stopServices := make(chan bool)
+	stopServices := make(chan bool, 10)
 	chanServices, chanServicesErr, err := c.WatchServices(stopServices)
 	if err != nil {
 		return watchCh, errCh, fmt.Errorf("failed to create watch: %v", err)
 	}
-	stopEndpoints := make(chan bool)
+	stopEndpoints := make(chan bool, 10)
 	chanEndpoints, chanEndpointsErr, err := c.WatchEndpoints(stopEndpoints)
 	if err != nil {
 		return watchCh, errCh, fmt.Errorf("failed to create watch: %v", err)
@@ -257,16 +258,17 @@ func (c *clientImpl) watch(url string, labelSelector string, stopCh <-chan bool)
 	if err != nil {
 		return watchCh, errCh, fmt.Errorf("failed to make watch request: GET %q : %v", url, err)
 	}
+	ctx, cancel := context.WithCancel(context.Background())
+	req = req.WithContext(ctx)
 	request.Client.Transport = request.Transport
 
 	res, err := request.Client.Do(req)
 	if err != nil {
+		cancel()
 		return watchCh, errCh, fmt.Errorf("failed to do watch request: GET %q: %v", url, err)
 	}
 
 	go func() {
-		finishCh := make(chan bool)
-		defer close(finishCh)
 		defer close(watchCh)
 		defer close(errCh)
 		go func() {
@@ -277,20 +279,15 @@ func (c *clientImpl) watch(url string, labelSelector string, stopCh <-chan bool)
 					if !strings.Contains(err.Error(), "net/http: request canceled") {
 						errCh <- fmt.Errorf("failed to decode watch event: GET %q : %v", url, err)
 					}
-					finishCh <- true
 					return
 				}
 				watchCh <- eventList
 			}
 		}()
-		select {
-		case <-stopCh:
-			go func() {
-				request.Transport.CancelRequest(req)
-			}()
-			<-finishCh
-			return
-		}
+		<-stopCh
+		go func() {
+			cancel() // cancel watch request
+		}()
 	}()
 	return watchCh, errCh, nil
 }

provider/kubernetes.go

@@ -130,6 +130,7 @@ func (provider *Kubernetes) Provide(configurationChan chan<- types.ConfigMessage
 						log.Debugf("Received event from kubernetes %+v", event)
 						templateObjects, err := provider.loadIngresses(k8sClient)
 						if err != nil {
+							stopWatch <- true
 							return err
 						}
 						if reflect.DeepEqual(provider.lastConfiguration.Get(), templateObjects) {