unpack struct element/value fields of list/map (#265)

A previous commit added functionality to the API/resource inference
process to "unpack" a struct field's member fields into the
`pkg/model.Field.MemberFields` map. However, I had failed to account for
lists or maps of structs. This patch accounts for the list or map of
structs fields, stepping into the list field's element struct type and
adding a Field definition to the containing Field's `MemberFields` map
for each member field in the element struct type. Same for containing
shapes of type "map".

With this patch, we're now able to "access" via field path any nested
field (including its corresponding `FieldConfig` object) which means
that in following patches we can finally resolve the "different Go types
for nested fields" problem we've had in the code generator.

Related 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/model/field.go

@@ -154,15 +154,48 @@ func NewField(
 	if shapeRef != nil {
 		shape = shapeRef.Shape
 	}
+	// this is a pointer to the "parent" containing Shape when the field being
+	// processed here is a structure or a list/map of structures.
+	var containerShape *awssdkmodel.Shape = shape
 
 	if shape != nil {
 		gte, gt, gtwp = CleanGoType(crd.sdkAPI, crd.cfg, shape, cfg)
-		if shape.Type == "structure" {
+		for {
+			// If the field is a slice or map of structs, we want to add
+			// MemberFields that describe the list or value struct elements so
+			// that a field path can be used to "find" nested struct member
+			// fields.
+			//
+			// For example, the EC2 resource DHCPOptions has a Field called
+			// DHCPConfigurations which is of type []*NewDHCPConfiguration
+			// where the NewDHCPConfiguration struct contains two fields, Key
+			// and Values. If we want to be able to refer to the
+			// DHCPOptions.DHCPConfigurations.Values field by field path, we
+			// need a Field.MemberField that describes the
+			// NewDHCPConfiguration.Values field.
+			//
+			// Here, we essentially dive down into list or map fields,
+			// searching for whether the list or map fields have structure list
+			// element or value element types and then rely on the code below
+			// to "unpack" those struct member fields.
+			if containerShape.Type == "list" {
+				containerShape = containerShape.MemberRef.Shape
+				continue
+			} else if containerShape.Type == "map" {
+				containerShape = containerShape.ValueRef.Shape
+				continue
+			}
+			break
+		}
+		if containerShape.Type == "structure" {
 			// "unpack" the member fields composing this struct field...
-			for _, memberName := range shape.MemberNames() {
+			for _, memberName := range containerShape.MemberNames() {
 				cleanMemberNames := names.New(memberName)
 				memberPath := path + "." + cleanMemberNames.Camel
-				memberField := NewField(crd, memberPath, cleanMemberNames, shape.MemberRefs[memberName], cfg)
+				memberShape := containerShape.MemberRefs[memberName]
+				memberField := NewField(
+					crd, memberPath, cleanMemberNames, memberShape, cfg,
+				)
 				memberFields[cleanMemberNames.Camel] = memberField
 			}
 		}

pkg/model/field_test.go

@@ -33,7 +33,7 @@ func TestMemberFields(t *testing.T) {
 	require.NotNil(ltdField.ShapeRef)
 	require.Equal(ltdField.ShapeRef.Shape.Type, "structure")
 
-	assert.NotNil(ltdField.MemberFields)
+	require.NotNil(ltdField.MemberFields)
 
 	// HibernationOptions is a member of the LaunchTemplateData structure and
 	// is itself another structure field. Make sure that the Field definition
@@ -44,6 +44,63 @@ func TestMemberFields(t *testing.T) {
 	assert.NotNil(hoField.MemberFields)
 
 	hocField := hoField.MemberFields["Configured"]
-	assert.NotNil(hocField)
+	require.NotNil(hocField)
 	assert.Equal(hocField.Path, "LaunchTemplateData.HibernationOptions.Configured")
 }
+
+func TestMemberFields_Containers_ListOfStruct(t *testing.T) {
+	assert := assert.New(t)
+	require := require.New(t)
+
+	g := testutil.NewModelForService(t, "ec2")
+
+	crds, err := g.GetCRDs()
+	require.Nil(err)
+
+	crd := getCRDByName("DHCPOptions", crds)
+	require.NotNil(crd)
+
+	// The DHCPOptions resource has a DHCPConfigurations field that is of type
+	// []*NewDHCPConfiguration. Here, we test to make sure that the inference
+	// process deduced the DHCPOptions.DHCPConfigurations Field object's Values
+	// Field properly.
+	dhcpConfsField := crd.Fields["DHCPConfigurations"]
+	require.NotNil(dhcpConfsField)
+
+	require.NotNil(dhcpConfsField.MemberFields)
+	valuesField := dhcpConfsField.MemberFields["Values"]
+	require.NotNil(valuesField)
+	require.NotNil(valuesField.ShapeRef)
+	require.NotNil(valuesField.ShapeRef.Shape)
+	assert.Equal(valuesField.ShapeRef.Shape.Type, "list")
+	assert.Equal(valuesField.Path, "DHCPConfigurations.Values")
+}
+
+func TestMemberFields_Containers_MapOfStruct(t *testing.T) {
+	assert := assert.New(t)
+	require := require.New(t)
+
+	g := testutil.NewModelForService(t, "sagemaker")
+
+	crds, err := g.GetCRDs()
+	require.Nil(err)
+
+	crd := getCRDByName("TrialComponent", crds)
+	require.NotNil(crd)
+
+	// The TrialComponent resource has an InputArtifacts field that is of type
+	// map[string]*TrialComponentArtifact. TrialComponentArtifact is a struct
+	// with two member fields, Value and MediaType. Here, we test to make sure
+	// that the inference process deduced the TrialComponent.InputArtifacts
+	// Field object's Value Field properly.
+	inArtifactsField := crd.Fields["InputArtifacts"]
+	require.NotNil(inArtifactsField)
+
+	require.NotNil(inArtifactsField.MemberFields)
+	valueField := inArtifactsField.MemberFields["Value"]
+	require.NotNil(valueField)
+	require.NotNil(valueField.ShapeRef)
+	require.NotNil(valueField.ShapeRef.Shape)
+	assert.Equal(valueField.ShapeRef.Shape.Type, "string")
+	assert.Equal(valueField.Path, "InputArtifacts.Value")
+}

pkg/model/util_test.go

@@ -15,6 +15,7 @@ package model_test
 
 import (
 	"sort"
+	"strings"
 
 	ackmodel "github.com/aws-controllers-k8s/code-generator/pkg/model"
 )
@@ -30,7 +31,7 @@ func attrCamelNames(fields map[string]*ackmodel.Field) []string {
 
 func getCRDByName(name string, crds []*ackmodel.CRD) *ackmodel.CRD {
 	for _, c := range crds {
-		if c.Names.Original == name {
+		if strings.EqualFold(c.Names.Original, name) {
 			return c
 		}
 	}
@@ -39,7 +40,7 @@ func getCRDByName(name string, crds []*ackmodel.CRD) *ackmodel.CRD {
 
 func getTypeDefByName(name string, tdefs []*ackmodel.TypeDef) *ackmodel.TypeDef {
 	for _, td := range tdefs {
-		if td.Names.Original == name {
+		if strings.EqualFold(td.Names.Original, name) {
 			return td
 		}
 	}

pkg/testdata/models/apis/sagemaker/0000-00-00/generator.yaml

@@ -65,10 +65,10 @@ ignore:
       - Project
       # TrainingJob
       - TransformJob
-      - TrialComponent
+      #- TrialComponent
       - Trial
       - UserProfile
       - Workforce
       - Workteam
     shape_names:
-      - TagList
+      - TagList