allow SetFieldConfig.From to refer to nested fields (#255)

Often, the Go type of a Create Input shape field (which goes in the
resource's Spec struct) is different from the Go type of the same-named
field in an Output shape. This causes problems for the code generator,
which doesn't know how to set the value of the Spec field due to these
different source and target Go types.

The `pkg/generate/config.SetConfig` struct was designed to solve this
particular issue, however the original solution only worked properly
when the field in the Output shape that we wanted to set the Spec field
*from* was at the same "level" as the field we wanted to set the value
*to*.

Take for example the case of the IAM Role resource, which has a Create
Input shape with a string `PermissionsBoundary` field. When creating the
Role, the user specifies the PermissionsBoundary as an ARN field. In the
Create and Get Output shapes, however, the `PermissionsBoundary` field
is a struct containing a `PermissionsBoundaryArn` string field. We want
to set the value of the Role resource's `Spec.PermissionsBoundary` field
to the string value of this nested
`PermissionsBoundary.PermissionsBoundaryArn` field. This patch
facilitates that by modifying the `pkg/generate/code.SetResource`
function to look up the field in the Output shape via a field path
instead of a single field name map lookup.

Issue aws-controllers-k8s/community#1065

Signed-off-by: Jay Pipes <jaypipes@gmail.com>

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Author: jaypipes

pkg/generate/code/set_resource.go

@@ -20,6 +20,7 @@ import (
 
 	awssdkmodel "github.com/aws/aws-sdk-go/private/model/api"
 
+	"github.com/aws-controllers-k8s/code-generator/pkg/fieldpath"
 	ackgenconfig "github.com/aws-controllers-k8s/code-generator/pkg/generate/config"
 	"github.com/aws-controllers-k8s/code-generator/pkg/model"
 	"github.com/aws-controllers-k8s/code-generator/pkg/names"
@@ -236,11 +237,11 @@ func SetResource(
 			// And this would indicate to the code generator that the Spec.Name
 			// field should be set from the value of the Output shape's Bucket
 			// field.
-			var found bool
 			if setCfg != nil && setCfg.From != nil {
-				sourceMemberShapeRef, found = outputShape.MemberRefs[*setCfg.From]
+				fp := fieldpath.FromString(*setCfg.From)
+				sourceMemberShapeRef = fp.ShapeRef(sourceMemberShapeRef)
 			}
-			if !found || sourceMemberShapeRef.Shape == nil {
+			if sourceMemberShapeRef == nil || sourceMemberShapeRef.Shape == nil {
 				// Technically this should not happen, so let's bail here if it
 				// does...
 				msg := fmt.Sprintf(
@@ -251,7 +252,7 @@ func SetResource(
 			}
 		}
 
-		sourceMemberShape := sourceMemberShapeRef.Shape
+		targetMemberShape := targetMemberShapeRef.Shape
 
 		// fieldVarName is the name of the variable that is used for temporary
 		// storage of complex member field values
@@ -289,7 +290,7 @@ func SetResource(
 			"%s.%s", targetAdaptedVarName, f.Names.Camel,
 		)
 
-		switch sourceMemberShape.Type {
+		switch targetMemberShape.Type {
 		case "list", "structure", "map":
 			{
 				memberVarName := fmt.Sprintf("f%d", memberIndex)
@@ -321,17 +322,6 @@ func SetResource(
 				// We have some special instructions to pull the value from a
 				// different field or member...
 				sourceAdaptedVarName = sourceVarName + "." + *setCfg.From
-				var found bool
-				sourceMemberShapeRef, found = outputShape.MemberRefs[*setCfg.From]
-				if !found {
-					// This is likely a typo in the generator.yaml file...
-					msg := fmt.Sprintf(
-						"expected to find a member shape of %s called %s",
-						outputShape.ShapeName,
-						*setCfg.From,
-					)
-					panic(msg)
-				}
 			}
 			out += setResourceForScalar(
 				qualifiedTargetVar,

pkg/generate/code/set_resource_test.go

@@ -3071,4 +3071,101 @@ func TestSetResource_EC2_SecurityGroups_SetResourceIdentifiers(t *testing.T) {
 		expected,
 		code.SetResource(crd.Config(), crd, model.OpTypeCreate, "resp", "ko", 1),
 	)
-}
+}
+
+func TestSetResource_IAM_Role_NestedSetConfig(t *testing.T) {
+	assert := assert.New(t)
+	require := require.New(t)
+
+	g := testutil.NewModelForService(t, "iam")
+
+	crd := testutil.GetCRDByName(t, g, "Role")
+	require.NotNil(crd)
+
+	// The input and output shapes for the PermissionsBoundary are different
+	// and we have a custom SetConfig for this field in our generator.yaml file
+	// to configure the SetResource function to set the value of the resource's
+	// Spec.PermissionsBoundary to the value of the (nested)
+	// GetRoleResponse.Role.PermissionsBoundary.PermissionsBoundaryArn field
+	expected := `
+	if ko.Status.ACKResourceMetadata == nil {
+		ko.Status.ACKResourceMetadata = &ackv1alpha1.ResourceMetadata{}
+	}
+	if resp.Role.Arn != nil {
+		arn := ackv1alpha1.AWSResourceName(*resp.Role.Arn)
+		ko.Status.ACKResourceMetadata.ARN = &arn
+	}
+	if resp.Role.AssumeRolePolicyDocument != nil {
+		ko.Spec.AssumeRolePolicyDocument = resp.Role.AssumeRolePolicyDocument
+	} else {
+		ko.Spec.AssumeRolePolicyDocument = nil
+	}
+	if resp.Role.CreateDate != nil {
+		ko.Status.CreateDate = &metav1.Time{*resp.Role.CreateDate}
+	} else {
+		ko.Status.CreateDate = nil
+	}
+	if resp.Role.Description != nil {
+		ko.Spec.Description = resp.Role.Description
+	} else {
+		ko.Spec.Description = nil
+	}
+	if resp.Role.MaxSessionDuration != nil {
+		ko.Spec.MaxSessionDuration = resp.Role.MaxSessionDuration
+	} else {
+		ko.Spec.MaxSessionDuration = nil
+	}
+	if resp.Role.Path != nil {
+		ko.Spec.Path = resp.Role.Path
+	} else {
+		ko.Spec.Path = nil
+	}
+	if resp.Role.PermissionsBoundary != nil {
+		ko.Spec.PermissionsBoundary = resp.Role.PermissionsBoundary.PermissionsBoundaryArn
+	} else {
+		ko.Spec.PermissionsBoundary = nil
+	}
+	if resp.Role.RoleId != nil {
+		ko.Status.RoleID = resp.Role.RoleId
+	} else {
+		ko.Status.RoleID = nil
+	}
+	if resp.Role.RoleLastUsed != nil {
+		f8 := &svcapitypes.RoleLastUsed{}
+		if resp.Role.RoleLastUsed.LastUsedDate != nil {
+			f8.LastUsedDate = &metav1.Time{*resp.Role.RoleLastUsed.LastUsedDate}
+		}
+		if resp.Role.RoleLastUsed.Region != nil {
+			f8.Region = resp.Role.RoleLastUsed.Region
+		}
+		ko.Status.RoleLastUsed = f8
+	} else {
+		ko.Status.RoleLastUsed = nil
+	}
+	if resp.Role.RoleName != nil {
+		ko.Spec.Name = resp.Role.RoleName
+	} else {
+		ko.Spec.Name = nil
+	}
+	if resp.Role.Tags != nil {
+		f10 := []*svcapitypes.Tag{}
+		for _, f10iter := range resp.Role.Tags {
+			f10elem := &svcapitypes.Tag{}
+			if f10iter.Key != nil {
+				f10elem.Key = f10iter.Key
+			}
+			if f10iter.Value != nil {
+				f10elem.Value = f10iter.Value
+			}
+			f10 = append(f10, f10elem)
+		}
+		ko.Spec.Tags = f10
+	} else {
+		ko.Spec.Tags = nil
+	}
+`
+	assert.Equal(
+		expected,
+		code.SetResource(crd.Config(), crd, model.OpTypeGet, "resp", "ko", 1),
+	)
+}