do not leak dockerclient

Signed-off-by: Victor Vieux <victorvieux@gmail.com>

api/api.go

@@ -353,7 +353,7 @@ func deleteImages(c *context, w http.ResponseWriter, r *http.Request) {
 	out := []*dockerclient.ImageDelete{}
 	errs := []string{}
 	for _, image := range matchedImages {
-		content, err := image.Node.DockerClient().RemoveImage(name)
+		content, err := c.cluster.RemoveImage(image)
 		if err != nil {
 			errs = append(errs, fmt.Sprintf("%s: %s", image.Node.Name(), err.Error()))
 			continue

api/events_test.go

@@ -5,7 +5,6 @@ import (
 	"testing"
 
 	"github.com/docker/swarm/cluster"
-	"github.com/samalba/dockerclient"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -20,7 +19,6 @@ func (fw *FakeWriter) Write(p []byte) (n int, err error) {
 
 type FakeNode struct{}
 
-func (fn *FakeNode) DockerClient() dockerclient.Client     { return nil }
 func (fn *FakeNode) ID() string                            { return "node_id" }
 func (fn *FakeNode) Name() string                          { return "node_name" }
 func (fn *FakeNode) IP() string                            { return "node_ip" }

cluster/cluster.go

@@ -15,6 +15,9 @@ type Cluster interface {
 	// Return one image matching `IdOrName`
 	Image(IdOrName string) *Image
 
+	// Remove an image from the cluster
+	RemoveImage(image *Image) ([]*dockerclient.ImageDelete, error)
+
 	// Return all containers
 	Containers() []*Container
 

cluster/node.go

@@ -1,14 +1,8 @@
 package cluster
 
-import (
-	"fmt"
-
-	"github.com/samalba/dockerclient"
-)
+import "fmt"
 
 type Node interface {
-	DockerClient() dockerclient.Client
-
 	ID() string
 	Name() string
 

cluster/swarm/cluster.go

@@ -186,6 +186,16 @@ func (c *Cluster) Image(IdOrName string) *cluster.Image {
 	return nil
 }
 
+// RemoveImage removes an image from the cluster
+func (c *Cluster) RemoveImage(image *cluster.Image) ([]*dockerclient.ImageDelete, error) {
+	c.Lock()
+	defer c.Unlock()
+	if n, ok := image.Node.(*node); ok {
+		return n.removeImage(image)
+	}
+	return nil, nil
+}
+
 func (c *Cluster) Pull(name string, callback func(what, status string)) {
 	size := len(c.nodes)
 	done := make(chan bool, size)

cluster/swarm/node.go

@@ -54,10 +54,6 @@ type node struct {
 	overcommitRatio int64
 }
 
-func (n *node) DockerClient() dockerclient.Client {
-	return n.client
-}
-
 func (n *node) ID() string {
 	return n.id
 }
@@ -167,6 +163,11 @@ func (n *node) updateSpecs() error {
 	return nil
 }
 
+// Delete an image from the node.
+func (n *node) removeImage(image *cluster.Image) ([]*dockerclient.ImageDelete, error) {
+	return n.client.RemoveImage(image.Id)
+}
+
 // Refresh the list of images on the node.
 func (n *node) refreshImages() error {
 	images, err := n.client.ListImages()

scheduler/filter/fakenode_test.go

@@ -1,9 +1,6 @@
 package filter
 
-import (
-	"github.com/docker/swarm/cluster"
-	"github.com/samalba/dockerclient"
-)
+import "github.com/docker/swarm/cluster"
 
 type FakeNode struct {
 	id         string
@@ -14,7 +11,6 @@ type FakeNode struct {
 	labels     map[string]string
 }
 
-func (fn *FakeNode) DockerClient() dockerclient.Client { return nil }
 func (fn *FakeNode) ID() string               { return fn.id }
 func (fn *FakeNode) Name() string             { return fn.name }
 func (fn *FakeNode) IP() string               { return "" }

scheduler/strategy/fakenode_test.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 
 	"github.com/docker/swarm/cluster"
-	"github.com/samalba/dockerclient"
 )
 
 type FakeNode struct {
@@ -18,7 +17,6 @@ type FakeNode struct {
 	containers []*cluster.Container
 }
 
-func (fn *FakeNode) DockerClient() dockerclient.Client     { return nil }
 func (fn *FakeNode) ID() string                            { return fn.id }
 func (fn *FakeNode) Name() string                          { return fn.name }
 func (fn *FakeNode) IP() string                            { return "" }