bp2build/testing.go

// Copyright 2021 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package bp2build

/*
For shareable/common bp2build testing functionality and dumping ground for
specific-but-shared functionality among tests in package
*/

import (
	"fmt"
	"strings"
	"testing"

	"android/soong/android"
	"android/soong/android/allowlists"
	"android/soong/bazel"
)

var (
	buildDir string
)

func checkError(t *testing.T, errs []error, expectedErr error) bool {
	t.Helper()

	if len(errs) != 1 {
		return false
	}
	if strings.Contains(errs[0].Error(), expectedErr.Error()) {
		return true
	}

	return false
}

func errored(t *testing.T, tc Bp2buildTestCase, errs []error) bool {
	t.Helper()
	if tc.ExpectedErr != nil {
		// Rely on checkErrors, as this test case is expected to have an error.
		return false
	}

	if len(errs) > 0 {
		for _, err := range errs {
			t.Errorf("%s: %s", tc.Description, err)
		}
		return true
	}

	// All good, continue execution.
	return false
}

func RunBp2BuildTestCaseSimple(t *testing.T, tc Bp2buildTestCase) {
	t.Helper()
	RunBp2BuildTestCase(t, func(ctx android.RegistrationContext) {}, tc)
}

type Bp2buildTestCase struct {
	Description                string
	ModuleTypeUnderTest        string
	ModuleTypeUnderTestFactory android.ModuleFactory
	Blueprint                  string
	ExpectedBazelTargets       []string
	Filesystem                 map[string]string
	Dir                        string
	// An error with a string contained within the string of the expected error
	ExpectedErr         error
	UnconvertedDepsMode unconvertedDepsMode

	// For every directory listed here, the BUILD file for that directory will
	// be merged with the generated BUILD file. This allows custom BUILD targets
	// to be used in tests, or use BUILD files to draw package boundaries.
	KeepBuildFileForDirs []string
}

func RunBp2BuildTestCase(t *testing.T, registerModuleTypes func(ctx android.RegistrationContext), tc Bp2buildTestCase) {
	t.Helper()
	dir := "."
	filesystem := make(map[string][]byte)
	toParse := []string{
		"Android.bp",
	}
	for f, content := range tc.Filesystem {
		if strings.HasSuffix(f, "Android.bp") {
			toParse = append(toParse, f)
		}
		filesystem[f] = []byte(content)
	}
	config := android.TestConfig(buildDir, nil, tc.Blueprint, filesystem)
	ctx := android.NewTestContext(config)

	registerModuleTypes(ctx)
	ctx.RegisterModuleType(tc.ModuleTypeUnderTest, tc.ModuleTypeUnderTestFactory)

	// A default configuration for tests to not have to specify bp2build_available on top level targets.
	bp2buildConfig := android.NewBp2BuildAllowlist().SetDefaultConfig(
		allowlists.Bp2BuildConfig{
			android.Bp2BuildTopLevel: allowlists.Bp2BuildDefaultTrueRecursively,
		},
	)
	for _, f := range tc.KeepBuildFileForDirs {
		bp2buildConfig.SetKeepExistingBuildFile(map[string]bool{
			f: /*recursive=*/ false,
		})
	}
	ctx.RegisterBp2BuildConfig(bp2buildConfig)
	ctx.RegisterForBazelConversion()

	_, parseErrs := ctx.ParseFileList(dir, toParse)
	if errored(t, tc, parseErrs) {
		return
	}
	_, resolveDepsErrs := ctx.ResolveDependencies(config)
	if errored(t, tc, resolveDepsErrs) {
		return
	}

	parseAndResolveErrs := append(parseErrs, resolveDepsErrs...)
	if tc.ExpectedErr != nil && checkError(t, parseAndResolveErrs, tc.ExpectedErr) {
		return
	}

	checkDir := dir
	if tc.Dir != "" {
		checkDir = tc.Dir
	}
	codegenCtx := NewCodegenContext(config, *ctx.Context, Bp2Build)
	codegenCtx.unconvertedDepMode = tc.UnconvertedDepsMode
	bazelTargets, errs := generateBazelTargetsForDir(codegenCtx, checkDir)
	if tc.ExpectedErr != nil {
		if checkError(t, errs, tc.ExpectedErr) {
			return
		} else {
			t.Errorf("Expected error: %q, got: %q and %q", tc.ExpectedErr, errs, parseAndResolveErrs)
		}
	} else {
		android.FailIfErrored(t, errs)
	}
	if actualCount, expectedCount := len(bazelTargets), len(tc.ExpectedBazelTargets); actualCount != expectedCount {
		t.Errorf("%s: Expected %d bazel target (%s), got %d (%s)",
			tc.Description, expectedCount, tc.ExpectedBazelTargets, actualCount, bazelTargets)
	} else {
		for i, target := range bazelTargets {
			if w, g := tc.ExpectedBazelTargets[i], target.content; w != g {
				t.Errorf(
					"%s: Expected generated Bazel target to be `%s`, got `%s`",
					tc.Description, w, g)
			}
		}
	}
}

type nestedProps struct {
	Nested_prop *string
}

type EmbeddedProps struct {
	Embedded_prop *string
}

type OtherEmbeddedProps struct {
	Other_embedded_prop *string
}

type customProps struct {
	EmbeddedProps
	*OtherEmbeddedProps

	Bool_prop     bool
	Bool_ptr_prop *bool
	// Ensure that properties tagged `blueprint:mutated` are omitted
	Int_prop            int `blueprint:"mutated"`
	Int64_ptr_prop      *int64
	String_prop         string
	String_literal_prop *string `android:"arch_variant"`
	String_ptr_prop     *string
	String_list_prop    []string

	Nested_props     nestedProps
	Nested_props_ptr *nestedProps

	Arch_paths         []string `android:"path,arch_variant"`
	Arch_paths_exclude []string `android:"path,arch_variant"`

	// Prop used to indicate this conversion should be 1 module -> multiple targets
	One_to_many_prop *bool
}

type customModule struct {
	android.ModuleBase
	android.BazelModuleBase

	props customProps
}

// OutputFiles is needed because some instances of this module use dist with a
// tag property which requires the module implements OutputFileProducer.
func (m *customModule) OutputFiles(tag string) (android.Paths, error) {
	return android.PathsForTesting("path" + tag), nil
}

func (m *customModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	// nothing for now.
}

func customModuleFactoryBase() android.Module {
	module := &customModule{}
	module.AddProperties(&module.props)
	android.InitBazelModule(module)
	return module
}

func customModuleFactoryHostAndDevice() android.Module {
	m := customModuleFactoryBase()
	android.InitAndroidArchModule(m, android.HostAndDeviceSupported, android.MultilibBoth)
	return m
}

func customModuleFactoryDeviceSupported() android.Module {
	m := customModuleFactoryBase()
	android.InitAndroidArchModule(m, android.DeviceSupported, android.MultilibBoth)
	return m
}

func customModuleFactoryHostSupported() android.Module {
	m := customModuleFactoryBase()
	android.InitAndroidArchModule(m, android.HostSupported, android.MultilibBoth)
	return m
}

func customModuleFactoryHostAndDeviceDefault() android.Module {
	m := customModuleFactoryBase()
	android.InitAndroidArchModule(m, android.HostAndDeviceDefault, android.MultilibBoth)
	return m
}

func customModuleFactoryNeitherHostNorDeviceSupported() android.Module {
	m := customModuleFactoryBase()
	android.InitAndroidArchModule(m, android.NeitherHostNorDeviceSupported, android.MultilibBoth)
	return m
}

type testProps struct {
	Test_prop struct {
		Test_string_prop string
	}
}

type customTestModule struct {
	android.ModuleBase

	props      customProps
	test_props testProps
}

func (m *customTestModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	// nothing for now.
}

func customTestModuleFactoryBase() android.Module {
	m := &customTestModule{}
	m.AddProperties(&m.props)
	m.AddProperties(&m.test_props)
	return m
}

func customTestModuleFactory() android.Module {
	m := customTestModuleFactoryBase()
	android.InitAndroidModule(m)
	return m
}

type customDefaultsModule struct {
	android.ModuleBase
	android.DefaultsModuleBase
}

func customDefaultsModuleFactoryBase() android.DefaultsModule {
	module := &customDefaultsModule{}
	module.AddProperties(&customProps{})
	return module
}

func customDefaultsModuleFactoryBasic() android.Module {
	return customDefaultsModuleFactoryBase()
}

func customDefaultsModuleFactory() android.Module {
	m := customDefaultsModuleFactoryBase()
	android.InitDefaultsModule(m)
	return m
}

type EmbeddedAttr struct {
	Embedded_attr *string
}

type OtherEmbeddedAttr struct {
	Other_embedded_attr *string
}

type customBazelModuleAttributes struct {
	EmbeddedAttr
	*OtherEmbeddedAttr
	String_literal_prop bazel.StringAttribute
	String_ptr_prop     *string
	String_list_prop    []string
	Arch_paths          bazel.LabelListAttribute
}

func (m *customModule) ConvertWithBp2build(ctx android.TopDownMutatorContext) {
	if p := m.props.One_to_many_prop; p != nil && *p {
		customBp2buildOneToMany(ctx, m)
		return
	}

	paths := bazel.LabelListAttribute{}
	strAttr := bazel.StringAttribute{}
	for axis, configToProps := range m.GetArchVariantProperties(ctx, &customProps{}) {
		for config, props := range configToProps {
			if custProps, ok := props.(*customProps); ok {
				if custProps.Arch_paths != nil {
					paths.SetSelectValue(axis, config, android.BazelLabelForModuleSrcExcludes(ctx, custProps.Arch_paths, custProps.Arch_paths_exclude))
				}
				if custProps.String_literal_prop != nil {
					strAttr.SetSelectValue(axis, config, custProps.String_literal_prop)
				}
			}
		}
	}

	paths.ResolveExcludes()

	attrs := &customBazelModuleAttributes{
		String_literal_prop: strAttr,
		String_ptr_prop:     m.props.String_ptr_prop,
		String_list_prop:    m.props.String_list_prop,
		Arch_paths:          paths,
	}

	attrs.Embedded_attr = m.props.Embedded_prop
	if m.props.OtherEmbeddedProps != nil {
		attrs.OtherEmbeddedAttr = &OtherEmbeddedAttr{Other_embedded_attr: m.props.OtherEmbeddedProps.Other_embedded_prop}
	}

	props := bazel.BazelTargetModuleProperties{
		Rule_class: "custom",
	}

	ctx.CreateBazelTargetModule(props, android.CommonAttributes{Name: m.Name()}, attrs)
}

// A bp2build mutator that uses load statements and creates a 1:M mapping from
// module to target.
func customBp2buildOneToMany(ctx android.TopDownMutatorContext, m *customModule) {

	baseName := m.Name()
	attrs := &customBazelModuleAttributes{}

	myLibraryProps := bazel.BazelTargetModuleProperties{
		Rule_class:        "my_library",
		Bzl_load_location: "//build/bazel/rules:rules.bzl",
	}
	ctx.CreateBazelTargetModule(myLibraryProps, android.CommonAttributes{Name: baseName}, attrs)

	protoLibraryProps := bazel.BazelTargetModuleProperties{
		Rule_class:        "proto_library",
		Bzl_load_location: "//build/bazel/rules:proto.bzl",
	}
	ctx.CreateBazelTargetModule(protoLibraryProps, android.CommonAttributes{Name: baseName + "_proto_library_deps"}, attrs)

	myProtoLibraryProps := bazel.BazelTargetModuleProperties{
		Rule_class:        "my_proto_library",
		Bzl_load_location: "//build/bazel/rules:proto.bzl",
	}
	ctx.CreateBazelTargetModule(myProtoLibraryProps, android.CommonAttributes{Name: baseName + "_my_proto_library_deps"}, attrs)
}

// Helper method for tests to easily access the targets in a dir.
func generateBazelTargetsForDir(codegenCtx *CodegenContext, dir string) (BazelTargets, []error) {
	// TODO: Set generateFilegroups to true and/or remove the generateFilegroups argument completely
	res, err := GenerateBazelTargets(codegenCtx, false)
	if err != nil {
		return BazelTargets{}, err
	}
	return res.buildFileToTargets[dir], err
}

func registerCustomModuleForBp2buildConversion(ctx *android.TestContext) {
	ctx.RegisterModuleType("custom", customModuleFactoryHostAndDevice)
	ctx.RegisterForBazelConversion()
}

func simpleModuleDoNotConvertBp2build(typ, name string) string {
	return fmt.Sprintf(`
%s {
		name: "%s",
		bazel_module: { bp2build_available: false },
}`, typ, name)
}

type AttrNameToString map[string]string

func (a AttrNameToString) clone() AttrNameToString {
	newAttrs := make(AttrNameToString, len(a))
	for k, v := range a {
		newAttrs[k] = v
	}
	return newAttrs
}

// makeBazelTargetNoRestrictions returns bazel target build file definition that can be host or
// device specific, or independent of host/device.
func makeBazelTargetHostOrDevice(typ, name string, attrs AttrNameToString, hod android.HostOrDeviceSupported) string {
	if _, ok := attrs["target_compatible_with"]; !ok {
		switch hod {
		case android.HostSupported:
			attrs["target_compatible_with"] = `select({
        "//build/bazel/platforms/os:android": ["@platforms//:incompatible"],
        "//conditions:default": [],
    })`
		case android.DeviceSupported:
			attrs["target_compatible_with"] = `["//build/bazel/platforms/os:android"]`
		}
	}

	attrStrings := make([]string, 0, len(attrs)+1)
	if name != "" {
		attrStrings = append(attrStrings, fmt.Sprintf(`    name = "%s",`, name))
	}
	for _, k := range android.SortedStringKeys(attrs) {
		attrStrings = append(attrStrings, fmt.Sprintf("    %s = %s,", k, attrs[k]))
	}
	return fmt.Sprintf(`%s(
%s
)`, typ, strings.Join(attrStrings, "\n"))
}

// MakeBazelTargetNoRestrictions returns bazel target build file definition that does not add a
// target_compatible_with.  This is useful for module types like filegroup and genrule that arch not
// arch variant
func MakeBazelTargetNoRestrictions(typ, name string, attrs AttrNameToString) string {
	return makeBazelTargetHostOrDevice(typ, name, attrs, android.HostAndDeviceDefault)
}

// makeBazelTargetNoRestrictions returns bazel target build file definition that is device specific
// as this is the most common default in Soong.
func MakeBazelTarget(typ, name string, attrs AttrNameToString) string {
	return makeBazelTargetHostOrDevice(typ, name, attrs, android.DeviceSupported)
}

type ExpectedRuleTarget struct {
	Rule  string
	Name  string
	Attrs AttrNameToString
	Hod   android.HostOrDeviceSupported
}

func (ebr ExpectedRuleTarget) String() string {
	return makeBazelTargetHostOrDevice(ebr.Rule, ebr.Name, ebr.Attrs, ebr.Hod)
}

func makeCcStubSuiteTargets(name string, attrs AttrNameToString) string {
	if _, hasStubs := attrs["stubs_symbol_file"]; !hasStubs {
		return ""
	}
	STUB_SUITE_ATTRS := map[string]string{
		"stubs_symbol_file": "symbol_file",
		"stubs_versions":    "versions",
		"soname":            "soname",
		"source_library":    "source_library",
	}

	stubSuiteAttrs := AttrNameToString{}
	for key, _ := range attrs {
		if _, stubSuiteAttr := STUB_SUITE_ATTRS[key]; stubSuiteAttr {
			stubSuiteAttrs[STUB_SUITE_ATTRS[key]] = attrs[key]
		}
	}
	return MakeBazelTarget("cc_stub_suite", name+"_stub_libs", stubSuiteAttrs)
}