chore: add changed benchmark for Terragrunt. (#1896)

benchmarks/changed/changed_bench_test.go

@@ -49,6 +49,56 @@ func BenchmarkChangeDetection(b *testing.B) {
 	}
 }
 
+func BenchmarkChangeDetectionTFAndTG(b *testing.B) {
+	b.StopTimer()
+
+	const nTfStacks = 10
+	const nTGstacks = 10
+
+	s := sandbox.New(b)
+	layout := []string{
+		"f:config.hcl:" + Block("locals",
+			Expr("account", `read_terragrunt_config(find_in_parent_folders("account.hcl"))`),
+		).String(),
+		"f:account.hcl:" + Block("locals",
+			Str("account_name", "prod"),
+			Str("aws_account_id", "test"),
+		).String(),
+	}
+	for i := 0; i < nTfStacks; i++ {
+		layout = append(layout, fmt.Sprintf("f:modules/mod-%d/main.tf:%s", i, "# nothing here"))
+		layout = append(layout, fmt.Sprintf("s:stack-%d", i))
+		layout = append(layout, fmt.Sprintf("f:stack-%d/main.tf:%s", i, Block("module",
+			Labels("something"),
+			Str("source", fmt.Sprintf("../modules/mod-%d", i)),
+		).String()))
+	}
+	for i := 0; i < nTGstacks; i++ {
+		layout = append(layout, fmt.Sprintf("f:modules/mod-%d/main.tf:%s", i, "# nothing here"))
+		layout = append(layout, fmt.Sprintf("s:tg-%d", i))
+		layout = append(layout, fmt.Sprintf("f:tg-%d/terragrunt.hcl:%s", i, Block("terraform",
+			Str("source", fmt.Sprintf("../modules/mod-%d", i)),
+		).String()))
+	}
+	s.BuildTree(layout)
+	s.Git().CommitAll("create repo")
+	s.Git().Push("main")
+	s.Git().CheckoutNew("modify-some-modules")
+	test.WriteFile(b, filepath.Join(s.RootDir(), fmt.Sprintf("modules/mod-%d", nTfStacks-1)), "main.tf", "# modified")
+	s.Git().CommitAll("module modified")
+
+	manager := stack.NewGitAwareManager(s.Config(), s.Git().Unwrap())
+
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		report, err := manager.ListChanged("origin/main")
+		assert.NoError(b, err)
+		assert.EqualInts(b, 2, len(report.Stacks))
+		assert.EqualStrings(b, fmt.Sprintf("/stack-%d", nTfStacks-1), report.Stacks[0].Stack.Dir.String())
+		assert.EqualStrings(b, fmt.Sprintf("/tg-%d", nTGstacks-1), report.Stacks[1].Stack.Dir.String())
+	}
+}
+
 func init() {
 	zerolog.SetGlobalLevel(zerolog.Disabled)
 }