return proper error for inspect and proxy on unhealthy node

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

api/handlers.go

@@ -376,6 +376,12 @@ func getContainerJSON(c *context, w http.ResponseWriter, r *http.Request) {
 		httpError(w, fmt.Sprintf("No such container %s", name), http.StatusNotFound)
 		return
 	}
+
+	if !container.Engine.IsHealthy() {
+		httpError(w, fmt.Sprintf("Container %s running on unhealthy node %s", name, container.Engine.Name), http.StatusNotFound)
+		return
+	}
+
 	client, scheme := newClientAndScheme(c.tlsConfig)
 
 	resp, err := client.Get(scheme + "://" + container.Engine.Addr + "/containers/" + container.Id + "/json")

api/utils.go

@@ -64,10 +64,14 @@ func newClientAndScheme(tlsConfig *tls.Config) (*http.Client, string) {
 func getContainerFromVars(c *context, vars map[string]string) (string, *cluster.Container, error) {
 	if name, ok := vars["name"]; ok {
 		if container := c.cluster.Container(name); container != nil {
+			if !container.Engine.IsHealthy() {
+				return name, nil, fmt.Errorf("Container %s running on unhealthy node %s", name, container.Engine.Name)
+			}
 			return name, container, nil
 		}
 		return name, nil, fmt.Errorf("No such container: %s", name)
 	}
+
 	if ID, ok := vars["execid"]; ok {
 		for _, container := range c.cluster.Containers() {
 			for _, execID := range container.Info.ExecIDs {
@@ -78,6 +82,7 @@ func getContainerFromVars(c *context, vars map[string]string) (string, *cluster.
 		}
 		return "", nil, fmt.Errorf("Exec %s not found", ID)
 	}
+
 	return "", nil, errors.New("Not found")
 }
 

test/integration/api/logs.bats

@@ -27,3 +27,22 @@ function teardown() {
 	[[ "${lines[1]}" ==  *"hello docker"* ]]
 	[[ "${lines[2]}" ==  *"hello swarm"* ]]
 }
+
+@test "docker logs unhealthy node" {
+	start_docker_with_busybox 1
+	swarm_manage --engine-refresh-min-interval=1s --engine-refresh-max-interval=1s --engine-refresh-retry=1 ${HOSTS[0]}
+
+	# run a container with echo command
+	docker_swarm run -d --name test_container busybox /bin/sh -c "echo hello world; echo hello docker; echo hello swarm"
+
+	# Stop node-0
+	docker_host stop ${DOCKER_CONTAINERS[0]}
+
+	retry 5 1 eval "docker_swarm info | grep -q 'Unhealthy'"
+
+
+	# verify
+	run docker_swarm logs test_container
+	[ "$status" -eq 1 ]
+	[[ "${output}" == *" running on unhealthy node"* ]]
+}