rpcapi: Stacks.FindStackConfigurationComponents

This function returns a summary of the components and embedded stacks
declared inside a given stack configuration. This reports only on static
information that doesn't require any dynamic evaluation or provider plugin
execution, so it should be sufficient to build a skeleton of the UI
representing the content of a configuration that can then be populated
with dynamic information in later steps, to make the UI feel responsive.

internal/rpcapi/stacks.go

@@ -78,3 +78,52 @@ func (s *stacksServer) CloseStackConfiguration(ctx context.Context, req *terrafo
 	}
 	return &terraform1.CloseStackConfiguration_Response{}, nil
 }
+
+func (s *stacksServer) FindStackConfigurationComponents(ctx context.Context, req *terraform1.FindStackConfigurationComponents_Request) (*terraform1.FindStackConfigurationComponents_Response, error) {
+	cfgHnd := handle[*stackconfig.Config](req.StackConfigHandle)
+	cfg := s.handles.StackConfig(cfgHnd)
+	if cfg == nil {
+		return nil, status.Error(codes.InvalidArgument, "the given stack configuration handle is invalid")
+	}
+
+	return &terraform1.FindStackConfigurationComponents_Response{
+		Config: stackConfigMetaforProto(cfg.Root),
+	}, nil
+}
+
+func stackConfigMetaforProto(cfgNode *stackconfig.ConfigNode) *terraform1.FindStackConfigurationComponents_StackConfig {
+	ret := &terraform1.FindStackConfigurationComponents_StackConfig{
+		Components:     make(map[string]*terraform1.FindStackConfigurationComponents_Component),
+		EmbeddedStacks: make(map[string]*terraform1.FindStackConfigurationComponents_EmbeddedStack),
+	}
+
+	for name, cc := range cfgNode.Stack.Components {
+		cProto := &terraform1.FindStackConfigurationComponents_Component{
+			SourceAddr: cc.FinalSourceAddr.String(),
+		}
+		switch {
+		case cc.ForEach != nil:
+			cProto.Instances = terraform1.FindStackConfigurationComponents_FOR_EACH
+		default:
+			cProto.Instances = terraform1.FindStackConfigurationComponents_SINGLE
+		}
+		ret.Components[name] = cProto
+	}
+
+	for name, sn := range cfgNode.Children {
+		sc := cfgNode.Stack.EmbeddedStacks[name]
+		sProto := &terraform1.FindStackConfigurationComponents_EmbeddedStack{
+			SourceAddr: sn.Stack.SourceAddr.String(),
+			Config:     stackConfigMetaforProto(sn),
+		}
+		switch {
+		case sc.ForEach != nil:
+			sProto.Instances = terraform1.FindStackConfigurationComponents_FOR_EACH
+		default:
+			sProto.Instances = terraform1.FindStackConfigurationComponents_SINGLE
+		}
+		ret.EmbeddedStacks[name] = sProto
+	}
+
+	return ret
+}

internal/rpcapi/stacks_test.go

@@ -4,11 +4,14 @@ import (
 	"context"
 	"testing"
 
+	"github.com/google/go-cmp/cmp"
 	"github.com/hashicorp/go-slug/sourcebundle"
-	"github.com/hashicorp/terraform/internal/rpcapi/terraform1"
-	"github.com/hashicorp/terraform/internal/stacks/stackconfig"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/testing/protocmp"
+
+	"github.com/hashicorp/terraform/internal/rpcapi/terraform1"
+	"github.com/hashicorp/terraform/internal/stacks/stackconfig"
 )
 
 func TestStacksOpenCloseStackConfiguration(t *testing.T) {
@@ -92,3 +95,119 @@ func TestStacksOpenCloseStackConfiguration(t *testing.T) {
 		}
 	}
 }
+
+func TestStacksFindStackConfigurationComponents(t *testing.T) {
+	ctx := context.Background()
+
+	handles := newHandleTable()
+	stacksServer := newStacksServer(handles)
+
+	// In normal use a client would have previously opened a source bundle
+	// using Dependencies.OpenSourceBundle, so we'll simulate the effect
+	// of that here.
+	var sourcesHnd handle[*sourcebundle.Bundle]
+	{
+		sources, err := sourcebundle.OpenDir("testdata/sourcebundle")
+		if err != nil {
+			t.Fatal(err)
+		}
+		sourcesHnd = handles.NewSourceBundle(sources)
+	}
+
+	t.Run("empty config", func(t *testing.T) {
+		openResp, err := stacksServer.OpenStackConfiguration(ctx, &terraform1.OpenStackConfiguration_Request{
+			SourceBundleHandle: sourcesHnd.ForProtobuf(),
+			SourceAddress: &terraform1.SourceAddress{
+				Source: "git::https://example.com/foo.git",
+			},
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(openResp.Diagnostics) != 0 {
+			t.Error("empty configuration generated diagnostics; expected none")
+			if openResp.StackConfigHandle == 0 {
+				return // Our later operations will fail if given the nil handle
+			}
+		}
+
+		cmpntResp, err := stacksServer.FindStackConfigurationComponents(ctx, &terraform1.FindStackConfigurationComponents_Request{
+			StackConfigHandle: openResp.StackConfigHandle,
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		got := cmpntResp.Config
+		want := &terraform1.FindStackConfigurationComponents_StackConfig{
+			// Intentionally empty, because the configuration we've loaded
+			// is itself empty.
+		}
+		if diff := cmp.Diff(want, got, protocmp.Transform()); diff != "" {
+			t.Errorf("wrong result\n%s", diff)
+		}
+	})
+	t.Run("non-empty config", func(t *testing.T) {
+		openResp, err := stacksServer.OpenStackConfiguration(ctx, &terraform1.OpenStackConfiguration_Request{
+			SourceBundleHandle: sourcesHnd.ForProtobuf(),
+			SourceAddress: &terraform1.SourceAddress{
+				Source: "git::https://example.com/foo.git//non-empty-stack",
+			},
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(openResp.Diagnostics) != 0 {
+			t.Error("empty configuration generated diagnostics; expected none")
+			if openResp.StackConfigHandle == 0 {
+				return // Our later operations will fail if given the nil handle
+			}
+		}
+
+		cmpntResp, err := stacksServer.FindStackConfigurationComponents(ctx, &terraform1.FindStackConfigurationComponents_Request{
+			StackConfigHandle: openResp.StackConfigHandle,
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		got := cmpntResp.Config
+		want := &terraform1.FindStackConfigurationComponents_StackConfig{
+			Components: map[string]*terraform1.FindStackConfigurationComponents_Component{
+				"single": {
+					SourceAddr: "git::https://example.com/foo.git//non-empty-stack/empty-module",
+				},
+				"for_each": {
+					SourceAddr: "git::https://example.com/foo.git//non-empty-stack/empty-module",
+					Instances:  terraform1.FindStackConfigurationComponents_FOR_EACH,
+				},
+			},
+			EmbeddedStacks: map[string]*terraform1.FindStackConfigurationComponents_EmbeddedStack{
+				"single": {
+					SourceAddr: "git::https://example.com/foo.git//non-empty-stack/child",
+					Config: &terraform1.FindStackConfigurationComponents_StackConfig{
+						Components: map[string]*terraform1.FindStackConfigurationComponents_Component{
+							"foo": {
+								SourceAddr: "git::https://example.com/foo.git//non-empty-stack/empty-module",
+							},
+						},
+					},
+				},
+				"for_each": {
+					SourceAddr: "git::https://example.com/foo.git//non-empty-stack/child",
+					Instances:  terraform1.FindStackConfigurationComponents_FOR_EACH,
+					Config: &terraform1.FindStackConfigurationComponents_StackConfig{
+						Components: map[string]*terraform1.FindStackConfigurationComponents_Component{
+							"foo": {
+								SourceAddr: "git::https://example.com/foo.git//non-empty-stack/empty-module",
+							},
+						},
+					},
+				},
+			},
+		}
+		if diff := cmp.Diff(want, got, protocmp.Transform()); diff != "" {
+			t.Errorf("wrong result\n%s", diff)
+		}
+	})
+}

internal/rpcapi/terraform1/terraform1.pb.go

@@ -27,6 +27,55 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+type FindStackConfigurationComponents_Instances int32
+
+const (
+	FindStackConfigurationComponents_SINGLE   FindStackConfigurationComponents_Instances = 0
+	FindStackConfigurationComponents_COUNT    FindStackConfigurationComponents_Instances = 1
+	FindStackConfigurationComponents_FOR_EACH FindStackConfigurationComponents_Instances = 2
+)
+
+// Enum value maps for FindStackConfigurationComponents_Instances.
+var (
+	FindStackConfigurationComponents_Instances_name = map[int32]string{
+		0: "SINGLE",
+		1: "COUNT",
+		2: "FOR_EACH",
+	}
+	FindStackConfigurationComponents_Instances_value = map[string]int32{
+		"SINGLE":   0,
+		"COUNT":    1,
+		"FOR_EACH": 2,
+	}
+)
+
+func (x FindStackConfigurationComponents_Instances) Enum() *FindStackConfigurationComponents_Instances {
+	p := new(FindStackConfigurationComponents_Instances)
+	*p = x
+	return p
+}
+
+func (x FindStackConfigurationComponents_Instances) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (FindStackConfigurationComponents_Instances) Descriptor() protoreflect.EnumDescriptor {
+	return file_terraform1_proto_enumTypes[0].Descriptor()
+}
+
+func (FindStackConfigurationComponents_Instances) Type() protoreflect.EnumType {
+	return &file_terraform1_proto_enumTypes[0]
+}
+
+func (x FindStackConfigurationComponents_Instances) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use FindStackConfigurationComponents_Instances.Descriptor instead.
+func (FindStackConfigurationComponents_Instances) EnumDescriptor() ([]byte, []int) {
+	return file_terraform1_proto_rawDescGZIP(), []int{7, 0}
+}
+
 type Diagnostic_Severity int32
 
 const (
@@ -60,11 +109,11 @@ func (x Diagnostic_Severity) String() string {
 }
 
 func (Diagnostic_Severity) Descriptor() protoreflect.EnumDescriptor {
-	return file_terraform1_proto_enumTypes[0].Descriptor()
+	return file_terraform1_proto_enumTypes[1].Descriptor()
 }
 
 func (Diagnostic_Severity) Type() protoreflect.EnumType {
-	return &file_terraform1_proto_enumTypes[0]
+	return &file_terraform1_proto_enumTypes[1]
 }
 
 func (x Diagnostic_Severity) Number() protoreflect.EnumNumber {
@@ -428,6 +477,10 @@ func (*FindStackConfigurationProviders) Descriptor() ([]byte, []int) {
 // A source address in the same form as it would appear in a Terraform
 // configuration: a source string combined with an optional version constraint
 // string, where the latter is valid only for registry module addresses.
+//
+// This is not used for "final" source addresses that have already been reduced
+// to an exact version selection. For those we just directly encode the string
+// representation of the final address, including a version number if necessary.
 type SourceAddress struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1207,6 +1260,8 @@ type FindStackConfigurationComponents_Response struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	Config *FindStackConfigurationComponents_StackConfig `protobuf:"bytes,1,opt,name=config,proto3" json:"config,omitempty"`
 }
 
 func (x *FindStackConfigurationComponents_Response) Reset() {
@@ -1241,6 +1296,186 @@ func (*FindStackConfigurationComponents_Response) Descriptor() ([]byte, []int) {
 	return file_terraform1_proto_rawDescGZIP(), []int{7, 1}
 }
 
+func (x *FindStackConfigurationComponents_Response) GetConfig() *FindStackConfigurationComponents_StackConfig {
+	if x != nil {
+		return x.Config
+	}
+	return nil
+}
+
+type FindStackConfigurationComponents_StackConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Components     map[string]*FindStackConfigurationComponents_Component     `protobuf:"bytes,1,rep,name=components,proto3" json:"components,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	EmbeddedStacks map[string]*FindStackConfigurationComponents_EmbeddedStack `protobuf:"bytes,2,rep,name=embedded_stacks,json=embeddedStacks,proto3" json:"embedded_stacks,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+}
+
+func (x *FindStackConfigurationComponents_StackConfig) Reset() {
+	*x = FindStackConfigurationComponents_StackConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_terraform1_proto_msgTypes[25]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FindStackConfigurationComponents_StackConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FindStackConfigurationComponents_StackConfig) ProtoMessage() {}
+
+func (x *FindStackConfigurationComponents_StackConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_terraform1_proto_msgTypes[25]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FindStackConfigurationComponents_StackConfig.ProtoReflect.Descriptor instead.
+func (*FindStackConfigurationComponents_StackConfig) Descriptor() ([]byte, []int) {
+	return file_terraform1_proto_rawDescGZIP(), []int{7, 2}
+}
+
+func (x *FindStackConfigurationComponents_StackConfig) GetComponents() map[string]*FindStackConfigurationComponents_Component {
+	if x != nil {
+		return x.Components
+	}
+	return nil
+}
+
+func (x *FindStackConfigurationComponents_StackConfig) GetEmbeddedStacks() map[string]*FindStackConfigurationComponents_EmbeddedStack {
+	if x != nil {
+		return x.EmbeddedStacks
+	}
+	return nil
+}
+
+type FindStackConfigurationComponents_EmbeddedStack struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	SourceAddr string                                        `protobuf:"bytes,1,opt,name=source_addr,json=sourceAddr,proto3" json:"source_addr,omitempty"`
+	Instances  FindStackConfigurationComponents_Instances    `protobuf:"varint,2,opt,name=instances,proto3,enum=terraform1.FindStackConfigurationComponents_Instances" json:"instances,omitempty"`
+	Config     *FindStackConfigurationComponents_StackConfig `protobuf:"bytes,3,opt,name=config,proto3" json:"config,omitempty"`
+}
+
+func (x *FindStackConfigurationComponents_EmbeddedStack) Reset() {
+	*x = FindStackConfigurationComponents_EmbeddedStack{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_terraform1_proto_msgTypes[26]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FindStackConfigurationComponents_EmbeddedStack) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FindStackConfigurationComponents_EmbeddedStack) ProtoMessage() {}
+
+func (x *FindStackConfigurationComponents_EmbeddedStack) ProtoReflect() protoreflect.Message {
+	mi := &file_terraform1_proto_msgTypes[26]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FindStackConfigurationComponents_EmbeddedStack.ProtoReflect.Descriptor instead.
+func (*FindStackConfigurationComponents_EmbeddedStack) Descriptor() ([]byte, []int) {
+	return file_terraform1_proto_rawDescGZIP(), []int{7, 3}
+}
+
+func (x *FindStackConfigurationComponents_EmbeddedStack) GetSourceAddr() string {
+	if x != nil {
+		return x.SourceAddr
+	}
+	return ""
+}
+
+func (x *FindStackConfigurationComponents_EmbeddedStack) GetInstances() FindStackConfigurationComponents_Instances {
+	if x != nil {
+		return x.Instances
+	}
+	return FindStackConfigurationComponents_SINGLE
+}
+
+func (x *FindStackConfigurationComponents_EmbeddedStack) GetConfig() *FindStackConfigurationComponents_StackConfig {
+	if x != nil {
+		return x.Config
+	}
+	return nil
+}
+
+type FindStackConfigurationComponents_Component struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	SourceAddr string                                     `protobuf:"bytes,1,opt,name=source_addr,json=sourceAddr,proto3" json:"source_addr,omitempty"`
+	Instances  FindStackConfigurationComponents_Instances `protobuf:"varint,2,opt,name=instances,proto3,enum=terraform1.FindStackConfigurationComponents_Instances" json:"instances,omitempty"`
+}
+
+func (x *FindStackConfigurationComponents_Component) Reset() {
+	*x = FindStackConfigurationComponents_Component{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_terraform1_proto_msgTypes[27]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FindStackConfigurationComponents_Component) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FindStackConfigurationComponents_Component) ProtoMessage() {}
+
+func (x *FindStackConfigurationComponents_Component) ProtoReflect() protoreflect.Message {
+	mi := &file_terraform1_proto_msgTypes[27]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FindStackConfigurationComponents_Component.ProtoReflect.Descriptor instead.
+func (*FindStackConfigurationComponents_Component) Descriptor() ([]byte, []int) {
+	return file_terraform1_proto_rawDescGZIP(), []int{7, 4}
+}
+
+func (x *FindStackConfigurationComponents_Component) GetSourceAddr() string {
+	if x != nil {
+		return x.SourceAddr
+	}
+	return ""
+}
+
+func (x *FindStackConfigurationComponents_Component) GetInstances() FindStackConfigurationComponents_Instances {
+	if x != nil {
+		return x.Instances
+	}
+	return FindStackConfigurationComponents_SINGLE
+}
+
 type FindStackConfigurationProviders_Request struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1252,7 +1487,7 @@ type FindStackConfigurationProviders_Request struct {
 func (x *FindStackConfigurationProviders_Request) Reset() {
 	*x = FindStackConfigurationProviders_Request{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_terraform1_proto_msgTypes[25]
+		mi := &file_terraform1_proto_msgTypes[30]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1265,7 +1500,7 @@ func (x *FindStackConfigurationProviders_Request) String() string {
 func (*FindStackConfigurationProviders_Request) ProtoMessage() {}
 
 func (x *FindStackConfigurationProviders_Request) ProtoReflect() protoreflect.Message {
-	mi := &file_terraform1_proto_msgTypes[25]
+	mi := &file_terraform1_proto_msgTypes[30]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1297,7 +1532,7 @@ type FindStackConfigurationProviders_Response struct {
 func (x *FindStackConfigurationProviders_Response) Reset() {
 	*x = FindStackConfigurationProviders_Response{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_terraform1_proto_msgTypes[26]
+		mi := &file_terraform1_proto_msgTypes[31]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1310,7 +1545,7 @@ func (x *FindStackConfigurationProviders_Response) String() string {
 func (*FindStackConfigurationProviders_Response) ProtoMessage() {}
 
 func (x *FindStackConfigurationProviders_Response) ProtoReflect() protoreflect.Message {
-	mi := &file_terraform1_proto_msgTypes[26]
+	mi := &file_terraform1_proto_msgTypes[31]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1381,107 +1616,168 @@ var file_terraform1_proto_rawDesc = []byte{
 	0x5f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x5f, 0x68, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x18, 0x01,
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+	0x72, 0x73, 0x2e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x34, 0x2e, 0x74, 0x65, 0x72,
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+	0x6b, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x50, 0x72,
+	0x6f, 0x76, 0x69, 0x64, 0x65, 0x72, 0x73, 0x2e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
+	0x12, 0x8f, 0x01, 0x0a, 0x20, 0x46, 0x69, 0x6e, 0x64, 0x53, 0x74, 0x61, 0x63, 0x6b, 0x43, 0x6f,
+	0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x43, 0x6f, 0x6d, 0x70, 0x6f,
+	0x6e, 0x65, 0x6e, 0x74, 0x73, 0x12, 0x34, 0x2e, 0x74, 0x65, 0x72, 0x72, 0x61, 0x66, 0x6f, 0x72,
+	0x6d, 0x31, 0x2e, 0x46, 0x69, 0x6e, 0x64, 0x53, 0x74, 0x61, 0x63, 0x6b, 0x43, 0x6f, 0x6e, 0x66,
+	0x69, 0x67, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x43, 0x6f, 0x6d, 0x70, 0x6f, 0x6e, 0x65,
+	0x6e, 0x74, 0x73, 0x2e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x35, 0x2e, 0x74, 0x65,
+	0x72, 0x72, 0x61, 0x66, 0x6f, 0x72, 0x6d, 0x31, 0x2e, 0x46, 0x69, 0x6e, 0x64, 0x53, 0x74, 0x61,
 	0x63, 0x6b, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x43,
-	0x6f, 0x6d, 0x70, 0x6f, 0x6e, 0x65, 0x6e, 0x74, 0x73, 0x12, 0x34, 0x2e, 0x74, 0x65, 0x72, 0x72,
-	0x61, 0x66, 0x6f, 0x72, 0x6d, 0x31, 0x2e, 0x46, 0x69, 0x6e, 0x64, 0x53, 0x74, 0x61, 0x63, 0x6b,
-	0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x43, 0x6f, 0x6d,
-	0x70, 0x6f, 0x6e, 0x65, 0x6e, 0x74, 0x73, 0x2e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a,
-	0x35, 0x2e, 0x74, 0x65, 0x72, 0x72, 0x61, 0x66, 0x6f, 0x72, 0x6d, 0x31, 0x2e, 0x46, 0x69, 0x6e,
-	0x64, 0x53, 0x74, 0x61, 0x63, 0x6b, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61, 0x74,
-	0x69, 0x6f, 0x6e, 0x43, 0x6f, 0x6d, 0x70, 0x6f, 0x6e, 0x65, 0x6e, 0x74, 0x73, 0x2e, 0x52, 0x65,
-	0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x6f, 0x6d, 0x70, 0x6f, 0x6e, 0x65, 0x6e, 0x74, 0x73, 0x2e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e,
+	0x73, 0x65, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1496,67 +1792,81 @@ func file_terraform1_proto_rawDescGZIP() []byte {
 	return file_terraform1_proto_rawDescData
 }
 
-var file_terraform1_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_terraform1_proto_msgTypes = make([]protoimpl.MessageInfo, 27)
+var file_terraform1_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
+var file_terraform1_proto_msgTypes = make([]protoimpl.MessageInfo, 32)
 var file_terraform1_proto_goTypes = []interface{}{
-	(Diagnostic_Severity)(0),                          // 0: terraform1.Diagnostic.Severity
-	(*Handshake)(nil),                                 // 1: terraform1.Handshake
-	(*OpenSourceBundle)(nil),                          // 2: terraform1.OpenSourceBundle
-	(*CloseSourceBundle)(nil),                         // 3: terraform1.CloseSourceBundle
-	(*ClientCapabilities)(nil),                        // 4: terraform1.ClientCapabilities
-	(*ServerCapabilities)(nil),                        // 5: terraform1.ServerCapabilities
-	(*OpenStackConfiguration)(nil),                    // 6: terraform1.OpenStackConfiguration
-	(*CloseStackConfiguration)(nil),                   // 7: terraform1.CloseStackConfiguration
-	(*FindStackConfigurationComponents)(nil),          // 8: terraform1.FindStackConfigurationComponents
-	(*FindStackConfigurationProviders)(nil),           // 9: terraform1.FindStackConfigurationProviders
-	(*SourceAddress)(nil),                             // 10: terraform1.SourceAddress
-	(*Diagnostic)(nil),                                // 11: terraform1.Diagnostic
-	(*SourceRange)(nil),                               // 12: terraform1.SourceRange
-	(*SourcePos)(nil),                                 // 13: terraform1.SourcePos
-	(*Handshake_Request)(nil),                         // 14: terraform1.Handshake.Request
-	(*Handshake_Response)(nil),                        // 15: terraform1.Handshake.Response
-	(*OpenSourceBundle_Request)(nil),                  // 16: terraform1.OpenSourceBundle.Request
-	(*OpenSourceBundle_Response)(nil),                 // 17: terraform1.OpenSourceBundle.Response
-	(*CloseSourceBundle_Request)(nil),                 // 18: terraform1.CloseSourceBundle.Request
-	(*CloseSourceBundle_Response)(nil),                // 19: terraform1.CloseSourceBundle.Response
-	(*OpenStackConfiguration_Request)(nil),            // 20: terraform1.OpenStackConfiguration.Request
-	(*OpenStackConfiguration_Response)(nil),           // 21: terraform1.OpenStackConfiguration.Response
-	(*CloseStackConfiguration_Request)(nil),           // 22: terraform1.CloseStackConfiguration.Request
-	(*CloseStackConfiguration_Response)(nil),          // 23: terraform1.CloseStackConfiguration.Response
-	(*FindStackConfigurationComponents_Request)(nil),  // 24: terraform1.FindStackConfigurationComponents.Request
-	(*FindStackConfigurationComponents_Response)(nil), // 25: terraform1.FindStackConfigurationComponents.Response
-	(*FindStackConfigurationProviders_Request)(nil),   // 26: terraform1.FindStackConfigurationProviders.Request
-	(*FindStackConfigurationProviders_Response)(nil),  // 27: terraform1.FindStackConfigurationProviders.Response
+	(FindStackConfigurationComponents_Instances)(0),        // 0: terraform1.FindStackConfigurationComponents.Instances
+	(Diagnostic_Severity)(0),                               // 1: terraform1.Diagnostic.Severity
+	(*Handshake)(nil),                                      // 2: terraform1.Handshake
+	(*OpenSourceBundle)(nil),                               // 3: terraform1.OpenSourceBundle
+	(*CloseSourceBundle)(nil),                              // 4: terraform1.CloseSourceBundle
+	(*ClientCapabilities)(nil),                             // 5: terraform1.ClientCapabilities
+	(*ServerCapabilities)(nil),                             // 6: terraform1.ServerCapabilities
+	(*OpenStackConfiguration)(nil),                         // 7: terraform1.OpenStackConfiguration
+	(*CloseStackConfiguration)(nil),                        // 8: terraform1.CloseStackConfiguration
+	(*FindStackConfigurationComponents)(nil),               // 9: terraform1.FindStackConfigurationComponents
+	(*FindStackConfigurationProviders)(nil),                // 10: terraform1.FindStackConfigurationProviders
+	(*SourceAddress)(nil),                                  // 11: terraform1.SourceAddress
+	(*Diagnostic)(nil),                                     // 12: terraform1.Diagnostic
+	(*SourceRange)(nil),                                    // 13: terraform1.SourceRange
+	(*SourcePos)(nil),                                      // 14: terraform1.SourcePos
+	(*Handshake_Request)(nil),                              // 15: terraform1.Handshake.Request
+	(*Handshake_Response)(nil),                             // 16: terraform1.Handshake.Response
+	(*OpenSourceBundle_Request)(nil),                       // 17: terraform1.OpenSourceBundle.Request
+	(*OpenSourceBundle_Response)(nil),                      // 18: terraform1.OpenSourceBundle.Response
+	(*CloseSourceBundle_Request)(nil),                      // 19: terraform1.CloseSourceBundle.Request
+	(*CloseSourceBundle_Response)(nil),                     // 20: terraform1.CloseSourceBundle.Response
+	(*OpenStackConfiguration_Request)(nil),                 // 21: terraform1.OpenStackConfiguration.Request
+	(*OpenStackConfiguration_Response)(nil),                // 22: terraform1.OpenStackConfiguration.Response
+	(*CloseStackConfiguration_Request)(nil),                // 23: terraform1.CloseStackConfiguration.Request
+	(*CloseStackConfiguration_Response)(nil),               // 24: terraform1.CloseStackConfiguration.Response
+	(*FindStackConfigurationComponents_Request)(nil),       // 25: terraform1.FindStackConfigurationComponents.Request
+	(*FindStackConfigurationComponents_Response)(nil),      // 26: terraform1.FindStackConfigurationComponents.Response
+	(*FindStackConfigurationComponents_StackConfig)(nil),   // 27: terraform1.FindStackConfigurationComponents.StackConfig
+	(*FindStackConfigurationComponents_EmbeddedStack)(nil), // 28: terraform1.FindStackConfigurationComponents.EmbeddedStack
+	(*FindStackConfigurationComponents_Component)(nil),     // 29: terraform1.FindStackConfigurationComponents.Component
+	nil, // 30: terraform1.FindStackConfigurationComponents.StackConfig.ComponentsEntry
+	nil, // 31: terraform1.FindStackConfigurationComponents.StackConfig.EmbeddedStacksEntry
+	(*FindStackConfigurationProviders_Request)(nil),  // 32: terraform1.FindStackConfigurationProviders.Request
+	(*FindStackConfigurationProviders_Response)(nil), // 33: terraform1.FindStackConfigurationProviders.Response
 }
 var file_terraform1_proto_depIdxs = []int32{
-	0,  // 0: terraform1.Diagnostic.severity:type_name -> terraform1.Diagnostic.Severity
-	12, // 1: terraform1.Diagnostic.subject:type_name -> terraform1.SourceRange
-	12, // 2: terraform1.Diagnostic.context:type_name -> terraform1.SourceRange
-	13, // 3: terraform1.SourceRange.start:type_name -> terraform1.SourcePos
-	13, // 4: terraform1.SourceRange.end:type_name -> terraform1.SourcePos
-	4,  // 5: terraform1.Handshake.Request.capabilities:type_name -> terraform1.ClientCapabilities
-	5,  // 6: terraform1.Handshake.Response.capabilities:type_name -> terraform1.ServerCapabilities
-	10, // 7: terraform1.OpenStackConfiguration.Request.source_address:type_name -> terraform1.SourceAddress
-	11, // 8: terraform1.OpenStackConfiguration.Response.diagnostics:type_name -> terraform1.Diagnostic
-	14, // 9: terraform1.Setup.Handshake:input_type -> terraform1.Handshake.Request
-	16, // 10: terraform1.Dependencies.OpenSourceBundle:input_type -> terraform1.OpenSourceBundle.Request
-	18, // 11: terraform1.Dependencies.CloseSourceBundle:input_type -> terraform1.CloseSourceBundle.Request
-	20, // 12: terraform1.Stacks.OpenStackConfiguration:input_type -> terraform1.OpenStackConfiguration.Request
-	22, // 13: terraform1.Stacks.CloseStackConfiguration:input_type -> terraform1.CloseStackConfiguration.Request
-	26, // 14: terraform1.Stacks.FindStackConfigurationProviders:input_type -> terraform1.FindStackConfigurationProviders.Request
-	24, // 15: terraform1.Stacks.FindStackConfigurationComponents:input_type -> terraform1.FindStackConfigurationComponents.Request
-	15, // 16: terraform1.Setup.Handshake:output_type -> terraform1.Handshake.Response
-	17, // 17: terraform1.Dependencies.OpenSourceBundle:output_type -> terraform1.OpenSourceBundle.Response
-	19, // 18: terraform1.Dependencies.CloseSourceBundle:output_type -> terraform1.CloseSourceBundle.Response
-	21, // 19: terraform1.Stacks.OpenStackConfiguration:output_type -> terraform1.OpenStackConfiguration.Response
-	23, // 20: terraform1.Stacks.CloseStackConfiguration:output_type -> terraform1.CloseStackConfiguration.Response
-	27, // 21: terraform1.Stacks.FindStackConfigurationProviders:output_type -> terraform1.FindStackConfigurationProviders.Response
-	25, // 22: terraform1.Stacks.FindStackConfigurationComponents:output_type -> terraform1.FindStackConfigurationComponents.Response
-	16, // [16:23] is the sub-list for method output_type
-	9,  // [9:16] is the sub-list for method input_type
-	9,  // [9:9] is the sub-list for extension type_name
-	9,  // [9:9] is the sub-list for extension extendee
-	0,  // [0:9] is the sub-list for field type_name
+	1,  // 0: terraform1.Diagnostic.severity:type_name -> terraform1.Diagnostic.Severity
+	13, // 1: terraform1.Diagnostic.subject:type_name -> terraform1.SourceRange
+	13, // 2: terraform1.Diagnostic.context:type_name -> terraform1.SourceRange
+	14, // 3: terraform1.SourceRange.start:type_name -> terraform1.SourcePos
+	14, // 4: terraform1.SourceRange.end:type_name -> terraform1.SourcePos
+	5,  // 5: terraform1.Handshake.Request.capabilities:type_name -> terraform1.ClientCapabilities
+	6,  // 6: terraform1.Handshake.Response.capabilities:type_name -> terraform1.ServerCapabilities
+	11, // 7: terraform1.OpenStackConfiguration.Request.source_address:type_name -> terraform1.SourceAddress
+	12, // 8: terraform1.OpenStackConfiguration.Response.diagnostics:type_name -> terraform1.Diagnostic
+	27, // 9: terraform1.FindStackConfigurationComponents.Response.config:type_name -> terraform1.FindStackConfigurationComponents.StackConfig
+	30, // 10: terraform1.FindStackConfigurationComponents.StackConfig.components:type_name -> terraform1.FindStackConfigurationComponents.StackConfig.ComponentsEntry
+	31, // 11: terraform1.FindStackConfigurationComponents.StackConfig.embedded_stacks:type_name -> terraform1.FindStackConfigurationComponents.StackConfig.EmbeddedStacksEntry
+	0,  // 12: terraform1.FindStackConfigurationComponents.EmbeddedStack.instances:type_name -> terraform1.FindStackConfigurationComponents.Instances
+	27, // 13: terraform1.FindStackConfigurationComponents.EmbeddedStack.config:type_name -> terraform1.FindStackConfigurationComponents.StackConfig
+	0,  // 14: terraform1.FindStackConfigurationComponents.Component.instances:type_name -> terraform1.FindStackConfigurationComponents.Instances
+	29, // 15: terraform1.FindStackConfigurationComponents.StackConfig.ComponentsEntry.value:type_name -> terraform1.FindStackConfigurationComponents.Component
+	28, // 16: terraform1.FindStackConfigurationComponents.StackConfig.EmbeddedStacksEntry.value:type_name -> terraform1.FindStackConfigurationComponents.EmbeddedStack
+	15, // 17: terraform1.Setup.Handshake:input_type -> terraform1.Handshake.Request
+	17, // 18: terraform1.Dependencies.OpenSourceBundle:input_type -> terraform1.OpenSourceBundle.Request
+	19, // 19: terraform1.Dependencies.CloseSourceBundle:input_type -> terraform1.CloseSourceBundle.Request
+	21, // 20: terraform1.Stacks.OpenStackConfiguration:input_type -> terraform1.OpenStackConfiguration.Request
+	23, // 21: terraform1.Stacks.CloseStackConfiguration:input_type -> terraform1.CloseStackConfiguration.Request
+	32, // 22: terraform1.Stacks.FindStackConfigurationProviders:input_type -> terraform1.FindStackConfigurationProviders.Request
+	25, // 23: terraform1.Stacks.FindStackConfigurationComponents:input_type -> terraform1.FindStackConfigurationComponents.Request
+	16, // 24: terraform1.Setup.Handshake:output_type -> terraform1.Handshake.Response
+	18, // 25: terraform1.Dependencies.OpenSourceBundle:output_type -> terraform1.OpenSourceBundle.Response
+	20, // 26: terraform1.Dependencies.CloseSourceBundle:output_type -> terraform1.CloseSourceBundle.Response
+	22, // 27: terraform1.Stacks.OpenStackConfiguration:output_type -> terraform1.OpenStackConfiguration.Response
+	24, // 28: terraform1.Stacks.CloseStackConfiguration:output_type -> terraform1.CloseStackConfiguration.Response
+	33, // 29: terraform1.Stacks.FindStackConfigurationProviders:output_type -> terraform1.FindStackConfigurationProviders.Response
+	26, // 30: terraform1.Stacks.FindStackConfigurationComponents:output_type -> terraform1.FindStackConfigurationComponents.Response
+	24, // [24:31] is the sub-list for method output_type
+	17, // [17:24] is the sub-list for method input_type
+	17, // [17:17] is the sub-list for extension type_name
+	17, // [17:17] is the sub-list for extension extendee
+	0,  // [0:17] is the sub-list for field type_name
 }
 
 func init() { file_terraform1_proto_init() }
@@ -1866,7 +2176,7 @@ func file_terraform1_proto_init() {
 			}
 		}
 		file_terraform1_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*FindStackConfigurationProviders_Request); i {
+			switch v := v.(*FindStackConfigurationComponents_StackConfig); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1878,6 +2188,42 @@ func file_terraform1_proto_init() {
 			}
 		}
 		file_terraform1_proto_msgTypes[26].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FindStackConfigurationComponents_EmbeddedStack); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_terraform1_proto_msgTypes[27].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FindStackConfigurationComponents_Component); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_terraform1_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FindStackConfigurationProviders_Request); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_terraform1_proto_msgTypes[31].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*FindStackConfigurationProviders_Response); i {
 			case 0:
 				return &v.state
@@ -1895,8 +2241,8 @@ func file_terraform1_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_terraform1_proto_rawDesc,
-			NumEnums:      1,
-			NumMessages:   27,
+			NumEnums:      2,
+			NumMessages:   32,
 			NumExtensions: 0,
 			NumServices:   3,
 		},

internal/rpcapi/terraform1/terraform1.proto

@@ -110,7 +110,26 @@ message FindStackConfigurationComponents {
         int64 stack_config_handle = 1;
     }
     message Response {
-        // TODO
+        StackConfig config = 1;
+    }
+
+    enum Instances {
+        SINGLE = 0;
+        COUNT = 1;
+        FOR_EACH = 2;
+    }
+    message StackConfig {
+        map<string, Component> components = 1;
+        map<string, EmbeddedStack> embedded_stacks = 2;
+    }
+    message EmbeddedStack {
+        string source_addr = 1;
+        Instances instances = 2;
+        StackConfig config = 3;
+    }
+    message Component {
+        string source_addr = 1;
+        Instances instances = 2;
     }
 }
 
@@ -126,6 +145,10 @@ message FindStackConfigurationProviders {
 // A source address in the same form as it would appear in a Terraform
 // configuration: a source string combined with an optional version constraint
 // string, where the latter is valid only for registry module addresses.
+//
+// This is not used for "final" source addresses that have already been reduced
+// to an exact version selection. For those we just directly encode the string
+// representation of the final address, including a version number if necessary.
 message SourceAddress {
     string source = 1;
     string versions = 2;

internal/rpcapi/testdata/sourcebundle/foo/foo.tfstack.hcl

@@ -0,0 +1,3 @@
+# This is intentionally empty. Some of our tests use this to straightfowardly
+# test the empty configuration case, so adding declarations here will break
+# those tests.

internal/rpcapi/testdata/sourcebundle/foo/non-empty-stack/child/non-empty-stack-child.tfstack.hcl

@@ -0,0 +1,3 @@
+component "foo" {
+  source = "../empty-module"
+}

internal/rpcapi/testdata/sourcebundle/foo/non-empty-stack/empty-module/nothing.tf

@@ -0,0 +1,3 @@
+# This module is intentionally empty, since it's called from stack
+# configurations where we're only testing the stack configuration stuff and
+# not the main Terraform language stuff.

internal/rpcapi/testdata/sourcebundle/foo/non-empty-stack/non-empty-stack.tfstack.hcl

@@ -0,0 +1,18 @@
+
+component "single" {
+  source = "./empty-module"
+}
+
+component "for_each" {
+  source   = "./empty-module"
+  for_each = {}
+}
+
+stack "single" {
+  source = "./child"
+}
+
+stack "for_each" {
+  source   = "./child"
+  for_each = {}
+}