Ensuring endpoint resources are freed even on delete failures

Came across a code path where we might not be releasing ip
address assigned to an endpoint if we have a failure with
deleteEndpoint. Even if there is a failure it is better to
release the resource rather than holding them. This might
lead to issues where ip never gets released even though
the container has exited and the only way of recovery is a
reload.

Signed-off-by: Abhinandan Prativadi <[email protected]>

Author: abhi

endpoint.go

@@ -822,7 +822,7 @@ func (ep *endpoint) Delete(force bool) error {
 		}
 	}
 
-	if err = n.getController().deleteFromStore(ep); err != nil {
+	if err = n.getController().deleteFromStore(ep); err != nil && !force {
 		return err
 	}
 

sandbox.go

@@ -182,10 +182,10 @@ func (sb *sandbox) Statistics() (map[string]*types.InterfaceStatistics, error) {
 }
 
 func (sb *sandbox) Delete() error {
-	return sb.delete(false)
+	return sb.delete()
 }
 
-func (sb *sandbox) delete(force bool) error {
+func (sb *sandbox) delete() error {
 	sb.Lock()
 	if sb.inDelete {
 		sb.Unlock()
@@ -208,10 +208,10 @@ func (sb *sandbox) delete(force bool) error {
 	retain := false
 	for _, ep := range sb.getConnectedEndpoints() {
 		// gw network endpoint detach and removal are automatic
-		if ep.endpointInGWNetwork() && !force {
+		if ep.endpointInGWNetwork() {
 			continue
 		}
-		// Retain the sanbdox if we can't obtain the network from store.
+		// Retain the sandbox if we can't obtain the network from store.
 		if _, err := c.getNetworkFromStore(ep.getNetwork().ID()); err != nil {
 			if c.isDistributedControl() {
 				retain = true
@@ -220,13 +220,11 @@ func (sb *sandbox) delete(force bool) error {
 			continue
 		}
 
-		if !force {
-			if err := ep.Leave(sb); err != nil {
-				logrus.Warnf("Failed detaching sandbox %s from endpoint %s: %v\n", sb.ID(), ep.ID(), err)
-			}
+		if err := ep.Leave(sb); err != nil {
+			logrus.Warnf("Failed detaching sandbox %s from endpoint %s: %v\n", sb.ID(), ep.ID(), err)
 		}
 
-		if err := ep.Delete(force); err != nil {
+		if err := ep.Delete(true); err != nil {
 			logrus.Warnf("Failed deleting endpoint %s: %v\n", ep.ID(), err)
 		}
 	}

sandbox_store.go

@@ -279,7 +279,7 @@ func (c *controller) sandboxCleanup(activeSandboxes map[string]interface{}) {
 
 		if _, ok := activeSandboxes[sb.ID()]; !ok {
 			logrus.Infof("Removing stale sandbox %s (%s)", sb.id, sb.containerID)
-			if err := sb.delete(true); err != nil {
+			if err := sb.delete(); err != nil {
 				logrus.Errorf("Failed to delete sandbox %s while trying to cleanup: %v", sb.id, err)
 			}
 			continue