terraform: config graph has providers

terraform/graph_config.go

@@ -27,11 +27,14 @@ func Graph2(mod *module.Tree) (*depgraph.Graph, error) {
 	nodes := make([]graphNodeConfig, 0,
 		(len(config.Modules)+len(config.Resources))*2)
 
+	// Write all the provider configs out
+	for _, pc := range config.ProviderConfigs {
+		nodes = append(nodes, &GraphNodeConfigProvider{Provider: pc})
+	}
+
 	// Write all the resources out
 	for _, r := range config.Resources {
-		nodes = append(nodes, &GraphNodeConfigResource{
-			Resource: r,
-		})
+		nodes = append(nodes, &GraphNodeConfigResource{Resource: r})
 	}
 
 	// Write all the modules out
@@ -66,71 +69,6 @@ func Graph2(mod *module.Tree) (*depgraph.Graph, error) {
 	return g, nil
 }
 
-// graphNodeConfig is an interface that all graph nodes for the
-// configuration graph need to implement in order to build the variable
-// dependencies properly.
-type graphNodeConfig interface {
-	depgraph.Node
-
-	// Variables returns the full list of variables that this node
-	// depends on.
-	Variables() map[string]config.InterpolatedVariable
-
-	// VarName returns the name that is used to identify a variable
-	// maps to this node. It should match the result of the
-	// `VarName` function.
-	VarName() string
-
-	// setDepMap sets the dependency map for this node. If the node is
-	// nil, then it wasn't found.
-	setDepMap(map[string]depgraph.Node)
-}
-
-// GraphNodeConfigResource represents a resource within the configuration
-// graph.
-type GraphNodeConfigResource struct {
-	Resource *config.Resource
-	DepMap   map[string]depgraph.Node
-}
-
-func (n *GraphNodeConfigResource) Deps() []depgraph.Node {
-	r := make([]depgraph.Node, 0, len(n.DepMap))
-	for _, v := range n.DepMap {
-		if v != nil {
-			r = append(r, v)
-		}
-	}
-
-	return r
-}
-
-func (n *GraphNodeConfigResource) Name() string {
-	return n.Resource.Id()
-}
-
-func (n *GraphNodeConfigResource) Variables() map[string]config.InterpolatedVariable {
-	var m map[string]config.InterpolatedVariable
-	if n.Resource != nil {
-		m = make(map[string]config.InterpolatedVariable)
-		for k, v := range n.Resource.RawCount.Variables {
-			m[k] = v
-		}
-		for k, v := range n.Resource.RawConfig.Variables {
-			m[k] = v
-		}
-	}
-
-	return m
-}
-
-func (n *GraphNodeConfigResource) VarName() string {
-	return n.Resource.Id()
-}
-
-func (n *GraphNodeConfigResource) setDepMap(m map[string]depgraph.Node) {
-	n.DepMap = m
-}
-
 // varNameForVar returns the VarName value for an interpolated variable.
 // This value is compared to the VarName() value for the nodes within the
 // graph to build the graph edges.

terraform/graph_config_node.go

@@ -0,0 +1,106 @@
+package terraform
+
+import (
+	"fmt"
+
+	"github.com/hashicorp/terraform/config"
+	"github.com/hashicorp/terraform/depgraph2"
+)
+
+// graphNodeConfig is an interface that all graph nodes for the
+// configuration graph need to implement in order to build the variable
+// dependencies properly.
+type graphNodeConfig interface {
+	depgraph.Node
+
+	// Variables returns the full list of variables that this node
+	// depends on.
+	Variables() map[string]config.InterpolatedVariable
+
+	// VarName returns the name that is used to identify a variable
+	// maps to this node. It should match the result of the
+	// `VarName` function.
+	VarName() string
+
+	// depMap and setDepMap are used to get and set the dependency map
+	// for this node. This is used to modify the dependencies. The key of
+	// this map should be the VarName() of graphNodeConfig.
+	depMap() map[string]depgraph.Node
+	setDepMap(map[string]depgraph.Node)
+}
+
+// graphNodeConfigBasicDepMap is a struct that provides the Deps(),
+// depMap(), and setDepMap() functions to help satisfy the graphNodeConfig
+// interface. This struct is meant to be embedded into other nodes to get
+// these features for free.
+type graphNodeConfigBasicDepMap struct {
+	DepMap map[string]depgraph.Node
+}
+
+func (n *graphNodeConfigBasicDepMap) Deps() []depgraph.Node {
+	r := make([]depgraph.Node, 0, len(n.DepMap))
+	for _, v := range n.DepMap {
+		if v != nil {
+			r = append(r, v)
+		}
+	}
+
+	return r
+}
+
+func (n *graphNodeConfigBasicDepMap) depMap() map[string]depgraph.Node {
+	return n.DepMap
+}
+
+func (n *graphNodeConfigBasicDepMap) setDepMap(m map[string]depgraph.Node) {
+	n.DepMap = m
+}
+
+// GraphNodeConfigProvider represents a resource within the config graph.
+type GraphNodeConfigProvider struct {
+	graphNodeConfigBasicDepMap
+
+	Provider *config.ProviderConfig
+}
+
+func (n *GraphNodeConfigProvider) Name() string {
+	return fmt.Sprintf("provider.%s", n.Provider.Name)
+}
+
+func (n *GraphNodeConfigProvider) Variables() map[string]config.InterpolatedVariable {
+	return n.Provider.RawConfig.Variables
+}
+
+func (n *GraphNodeConfigProvider) VarName() string {
+	return "never valid"
+}
+
+// GraphNodeConfigResource represents a resource within the config graph.
+type GraphNodeConfigResource struct {
+	graphNodeConfigBasicDepMap
+
+	Resource *config.Resource
+}
+
+func (n *GraphNodeConfigResource) Name() string {
+	return n.Resource.Id()
+}
+
+func (n *GraphNodeConfigResource) Variables() map[string]config.InterpolatedVariable {
+	var m map[string]config.InterpolatedVariable
+	if n.Resource != nil {
+		m = make(map[string]config.InterpolatedVariable)
+		for k, v := range n.Resource.RawCount.Variables {
+			m[k] = v
+		}
+		for k, v := range n.Resource.RawConfig.Variables {
+			m[k] = v
+		}
+	}
+
+	return m
+}
+
+func (n *GraphNodeConfigResource) VarName() string {
+	return n.Resource.Id()
+}

terraform/graph_config_node_test.go

@@ -0,0 +1,13 @@
+package terraform
+
+import (
+	"testing"
+
+	"github.com/hashicorp/terraform/depgraph2"
+)
+
+func TestGraphNodeConfigResource_impl(t *testing.T) {
+	var _ depgraph.Node = new(GraphNodeConfigResource)
+	var _ depgraph.NamedNode = new(GraphNodeConfigResource)
+	var _ graphNodeConfig = new(GraphNodeConfigResource)
+}

terraform/graph_config_test.go

@@ -47,4 +47,6 @@ aws_load_balancer.weblb
   aws_instance.web
 aws_security_group.firewall
 openstack_floating_ip.random
+provider.aws
+  openstack_floating_ip.random
 `