terraform: test that state is properly sent to Refresh

terraform/graph.go

@@ -54,7 +54,7 @@ func Graph(c *config.Config, s *State) *depgraph.Graph {
 
 	// First, build the initial resource graph. This only has the resources
 	// and no dependencies.
-	graphAddConfigResources(g, c)
+	graphAddConfigResources(g, c, s)
 
 	// Next, add the state orphans if we have any
 	if s != nil {
@@ -103,17 +103,24 @@ func GraphFull(g *depgraph.Graph, ps map[string]ResourceProviderFactory) error {
 }
 
 // configGraph turns a configuration structure into a dependency graph.
-func graphAddConfigResources(g *depgraph.Graph, c *config.Config) {
+func graphAddConfigResources(
+	g *depgraph.Graph, c *config.Config, s *State) {
 	// This tracks all the resource nouns
 	nouns := make(map[string]*depgraph.Noun)
 	for _, r := range c.Resources {
+		var state *ResourceState
+		if s != nil {
+			state = s.Resources[r.Id()]
+		}
+
 		noun := &depgraph.Noun{
 			Name: r.Id(),
 			Meta: &GraphNodeResource{
 				Type:   r.Type,
 				Config: r,
 				Resource: &Resource{
-					Id: r.Id(),
+					Id:    r.Id(),
+					State: state,
 				},
 			},
 		}

terraform/terraform.go

@@ -142,23 +142,22 @@ func (t *Terraform) Plan(s *State) (*Plan, error) {
 
 // Refresh goes through all the resources in the state and refreshes them
 // to their latest status.
-func (t *Terraform) Refresh(
+func (t *Terraform) Refresh(c *config.Config, s *State) (*State, error) {
-	c *config.Config, s *State, vs map[string]string) (*State, error) {
 	g, err := t.Graph(c, s)
 	if err != nil {
 		return s, err
 	}
 
-	return t.refresh(g, vs)
+	return t.refresh(g)
 }
 
-func (t *Terraform) refresh(g *depgraph.Graph, vars map[string]string) (*State, error) {
+func (t *Terraform) refresh(g *depgraph.Graph) (*State, error) {
 	s := new(State)
-	err := g.Walk(t.refreshWalkFn(vars, s))
+	err := g.Walk(t.refreshWalkFn(s))
 	return s, err
 }
 
-func (t *Terraform) refreshWalkFn(vars map[string]string, result *State) depgraph.WalkFunc {
+func (t *Terraform) refreshWalkFn(result *State) depgraph.WalkFunc {
 	var l sync.Mutex
 
 	// Initialize the result so we don't have to nil check everywhere
@@ -177,7 +176,7 @@ func (t *Terraform) refreshWalkFn(vars map[string]string, result *State) depgrap
 		return nil, nil
 	}
 
-	return t.genericWalkFn(vars, cb)
+	return t.genericWalkFn(nil, cb)
 }
 
 func (t *Terraform) applyWalkFn(

terraform/terraform_test.go

@@ -226,13 +226,56 @@ func TestTerraformRefresh(t *testing.T) {
 		ID: "foo",
 	}
 
-	s, err := tf.Refresh(c, nil, nil)
+	s, err := tf.Refresh(c, nil)
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}
 	if !rpAWS.RefreshCalled {
 		t.Fatal("refresh should be called")
 	}
+	if rpAWS.RefreshState != nil {
+		t.Fatalf("bad: %#v", rpAWS.RefreshState)
+	}
+	if !reflect.DeepEqual(s.Resources["aws_instance.web"], rpAWS.RefreshReturn) {
+		t.Fatalf("bad: %#v", s.Resources)
+	}
+}
+
+func TestTerraformRefresh_state(t *testing.T) {
+	rpAWS := new(MockResourceProvider)
+	rpAWS.ResourcesReturn = []ResourceType{
+		ResourceType{Name: "aws_instance"},
+	}
+
+	c := testConfig(t, "refresh-basic")
+	tf := testTerraform2(t, &Config{
+		Providers: map[string]ResourceProviderFactory{
+			"aws": testProviderFuncFixed(rpAWS),
+		},
+	})
+
+	rpAWS.RefreshReturn = &ResourceState{
+		ID: "foo",
+	}
+
+	state := &State{
+		Resources: map[string]*ResourceState{
+			"aws_instance.web": &ResourceState{
+				ID: "bar",
+			},
+		},
+	}
+
+	s, err := tf.Refresh(c, state)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	if !rpAWS.RefreshCalled {
+		t.Fatal("refresh should be called")
+	}
+	if !reflect.DeepEqual(rpAWS.RefreshState, state.Resources["aws_instance.web"]) {
+		t.Fatalf("bad: %#v", rpAWS.RefreshState)
+	}
 	if !reflect.DeepEqual(s.Resources["aws_instance.web"], rpAWS.RefreshReturn) {
 		t.Fatalf("bad: %#v", s.Resources)
 	}