terraform: put modules into the config graph

terraform/graph_config.go

@@ -25,7 +25,7 @@ func Graph2(mod *module.Tree) (*depgraph.Graph, error) {
 
 	// Create the node list we'll use for the graph
 	nodes := make([]graphNodeConfig, 0,
-		(len(config.Modules)+len(config.Resources))*2)
+		(len(config.ProviderConfigs)+len(config.Modules)+len(config.Resources))*2)
 
 	// Write all the provider configs out
 	for _, pc := range config.ProviderConfigs {
@@ -38,7 +38,9 @@ func Graph2(mod *module.Tree) (*depgraph.Graph, error) {
 	}
 
 	// Write all the modules out
-	// TODO
+	for _, m := range config.Modules {
+		nodes = append(nodes, &GraphNodeConfigModule{Module: m})
+	}
 
 	// Build the full map of the var names to the nodes.
 	fullMap := make(map[string]depgraph.Node)

terraform/graph_config_node.go

@@ -56,7 +56,28 @@ func (n *graphNodeConfigBasicDepMap) setDepMap(m map[string]depgraph.Node) {
 	n.DepMap = m
 }
 
-// GraphNodeConfigProvider represents a resource within the config graph.
+// GraphNodeConfigModule represents a module within the configuration graph.
+type GraphNodeConfigModule struct {
+	graphNodeConfigBasicDepMap
+
+	Module *config.Module
+}
+
+func (n *GraphNodeConfigModule) Name() string {
+	return fmt.Sprintf("module.%s", n.Module.Name)
+}
+
+func (n *GraphNodeConfigModule) Variables() map[string]config.InterpolatedVariable {
+	return n.Module.RawConfig.Variables
+}
+
+func (n *GraphNodeConfigModule) VarName() string {
+	return n.Name()
+}
+
+// GraphNodeConfigProvider represents a configured provider within the
+// configuration graph. These are only immediately in the graph when an
+// explicit `provider` configuration block is in the configuration.
 type GraphNodeConfigProvider struct {
 	graphNodeConfigBasicDepMap
 

terraform/graph_config_test.go

@@ -40,6 +40,19 @@ func TestGraph(t *testing.T) {
 	}
 }
 
+func TestGraph2_modules(t *testing.T) {
+	g, err := Graph2(testModule(t, "graph-modules"))
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := strings.TrimSpace(g.String())
+	expected := strings.TrimSpace(testGraphModulesStr)
+	if actual != expected {
+		t.Fatalf("bad:\n\n%s", actual)
+	}
+}
+
 const testGraphBasicStr = `
 aws_instance.web
   aws_security_group.firewall
@@ -50,3 +63,13 @@ openstack_floating_ip.random
 provider.aws
   openstack_floating_ip.random
 `
+
+const testGraphModulesStr = `
+aws_instance.web
+  aws_security_group.firewall
+  module.consul
+aws_security_group.firewall
+module.consul
+  aws_security_group.firewall
+provider.aws
+`