[pdata] Add support for the new resource-entity references in xpdata

.chloggen/xpdata-entities-api.yaml

@@ -0,0 +1,18 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: pdata
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add support for the new resource-entity reference API as part of the experimental xpdata package.
+
+# One or more tracking issues or pull requests related to the change
+issues: [13264]
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [api]

pdata/internal/cmd/pdatagen/internal/base_fields.go

@@ -348,14 +348,21 @@ type sliceField struct {
 	fieldName       string
 	originFieldName string
 	returnSlice     baseSlice
+	hideAccessors   bool
 }
 
 func (sf *sliceField) GenerateAccessors(ms *messageValueStruct) string {
+	if sf.hideAccessors {
+		return ""
+	}
 	t := template.Must(template.New("accessorSliceTemplate").Parse(accessorSliceTemplate))
 	return executeTemplate(t, sf.templateFields(ms))
 }
 
 func (sf *sliceField) GenerateAccessorsTest(ms *messageValueStruct) string {
+	if sf.hideAccessors {
+		return ""
+	}
 	t := template.Must(template.New("accessorsSliceTestTemplate").Parse(accessorsSliceTestTemplate))
 	return executeTemplate(t, sf.templateFields(ms))
 }

pdata/internal/cmd/pdatagen/internal/pcommon_package.go

@@ -160,6 +160,13 @@ var resource = &messageValueStruct{
 	fields: []baseField{
 		attributes,
 		droppedAttributesCount,
+		&sliceField{
+			// Hide accessors for this field from 1.x public API since the proto field is experimental.
+			// It's available via the xpdata/entity.ResourceEntityRefs.
+			hideAccessors:   true,
+			originFieldName: "EntityRefs",
+			returnSlice:     entityRefSlice,
+		},
 	},
 }
 

pdata/internal/cmd/pdatagen/internal/xpdata_entity_package.go

@@ -0,0 +1,60 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package internal // import "go.opentelemetry.io/collector/pdata/internal/cmd/pdatagen/internal"
+
+import "path/filepath"
+
+var xpdataEntity = &Package{
+	info: &PackageInfo{
+		name: "entity",
+		path: filepath.Join("xpdata", "entity"),
+		imports: []string{
+			`"go.opentelemetry.io/collector/pdata/internal"`,
+			`"go.opentelemetry.io/collector/pdata/pcommon"`,
+			`otlpcommon "go.opentelemetry.io/collector/pdata/internal/data/protogen/common/v1"`,
+			`otlpresource "go.opentelemetry.io/collector/pdata/internal/data/protogen/resource/v1"`,
+		},
+		testImports: []string{
+			`"testing"`,
+			``,
+			`"github.com/stretchr/testify/assert"`,
+			``,
+			`"go.opentelemetry.io/collector/pdata/internal"`,
+			`"go.opentelemetry.io/collector/pdata/pcommon"`,
+		},
+	},
+	structs: []baseStruct{
+		entityRefSlice,
+		entityRef,
+	},
+}
+
+var entityRefSlice = &sliceOfPtrs{
+	structName:  "EntityRefSlice",
+	packageName: "entity",
+	element:     entityRef,
+}
+
+var entityRef = &messageValueStruct{
+	structName:     "EntityRef",
+	packageName:    "entity",
+	originFullName: "otlpcommon.EntityRef",
+	fields: []baseField{
+		schemaURLField,
+		&primitiveField{
+			fieldName:  "Type",
+			returnType: "string",
+			defaultVal: `""`,
+			testVal:    `"host"`,
+		},
+		&sliceField{
+			fieldName:   "IdKeys",
+			returnSlice: stringSlice,
+		},
+		&sliceField{
+			fieldName:   "DescriptionKeys",
+			returnSlice: stringSlice,
+		},
+	},
+}