feat: sort the variables in the same order from input variables.tf file.

cli/bpmetadata/tfconfig.go

@@ -54,6 +54,15 @@ var metaSchema = &hcl.BodySchema{
 	},
 }
 
+var variableSchema = &hcl.BodySchema{
+	Blocks: []hcl.BlockHeaderSchema{
+		{
+			Type:       "variable",
+			LabelNames: []string{"name"},
+		},
+	},
+}
+
 var metaBlockSchema = &hcl.BodySchema{
 	Attributes: []hcl.AttributeSchema{
 		{
@@ -237,13 +246,21 @@ func getBlueprintInterfaces(configPath string) (*BlueprintInterface, error) {
 		variables = append(variables, v)
 	}
 
-	// Sort variables
-	sort.SliceStable(variables, func(i, j int) bool { return variables[i].Name < variables[j].Name })
+	// Get the varible orders from tf file.
+	variableOrders, sortErr := getBlueprintVariableOrders(configPath)
+	if sortErr != nil {
+		Log.Info("Failed to get variables orders. Fallback to sort by variable names.", sortErr)
+		sort.SliceStable(variables, func(i, j int) bool { return variables[i].Name < variables[j].Name })
+	} else {
+		Log.Info("Sort variables by the original input order.")
+		sort.SliceStable(variables, func(i, j int) bool {
+			return variableOrders[variables[i].Name] < variableOrders[variables[j].Name]
+		})
+	}
 
 	var outputs []*BlueprintOutput
 	for _, val := range mod.Outputs {
 		o := getBlueprintOutput(val)
-
 		outputs = append(outputs, o)
 	}
 
@@ -256,6 +273,35 @@ func getBlueprintInterfaces(configPath string) (*BlueprintInterface, error) {
 	}, nil
 }
 
+func getBlueprintVariableOrders(configPath string) (map[string]int, error) {
+	p := hclparse.NewParser()
+	variableFile, hclDiags := p.ParseHCLFile(filepath.Join(configPath, "variables.tf"))
+	err := hasHclErrors(hclDiags)
+	if hclDiags.HasErrors() {
+		return nil, err
+	}
+	variableContent, _, hclDiags := variableFile.Body.PartialContent(variableSchema)
+	err = hasHclErrors(hclDiags)
+	if hclDiags.HasErrors() {
+		return nil, err
+	}
+	variableOrderKeys := make(map[string]int)
+	for i, block := range variableContent.Blocks {
+		// We only care about variable blocks.
+		if block.Type != "variable" {
+			continue
+		}
+		// We expect a single label which is the variable name.
+		if len(block.Labels) != 1 || len(block.Labels[0]) == 0 {
+			Log.Info("zheng: called here.")
+			return nil, fmt.Errorf("Vaiable block has no name.")
+		}
+
+		variableOrderKeys[block.Labels[0]] = i
+	}
+	return variableOrderKeys, nil
+}
+
 // build variable
 func getBlueprintVariable(modVar *tfconfig.Variable) *BlueprintVariable {
 	v := &BlueprintVariable{

cli/bpmetadata/tfconfig_test.go

@@ -368,3 +368,48 @@ func TestTFIncompleteProviderVersions(t *testing.T) {
 		})
 	}
 }
+
+func TestTFVariableSortOrder(t *testing.T) {
+	tests := []struct {
+		name         string
+		configPath   string
+		expectOrders map[string]int
+		expectError  bool
+	}{
+		{
+			name:       "Variable order should match tf input",
+			configPath: "sample-module",
+			expectOrders: map[string]int{
+				"description": 1,
+				"project_id":  0,
+				"regional":    2,
+			},
+			expectError: false,
+		},
+		{
+			name:         "Empty vairable name should create nil order",
+			configPath:   "empty-module",
+			expectOrders: map[string]int{},
+			expectError:  true,
+		},
+		{
+			name:         "No vairable name should create nil order",
+			configPath:   "invalid-module",
+			expectOrders: map[string]int{},
+			expectError:  true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := getBlueprintVariableOrders(path.Join(tfTestdataPath, tt.configPath))
+			if tt.expectError {
+				assert.Error(t, err)
+				assert.Nil(t, got)
+			} else {
+				require.NoError(t, err)
+				assert.Equal(t, got, tt.expectOrders)
+			}
+		})
+	}
+}

cli/testdata/bpmetadata/tf/empty-module/outputs.tf

@@ -0,0 +1,37 @@
+/**
+ * Copyright 2022 Google LLC
+ *
+ * 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.
+ */
+
+// This file was automatically generated from a template in ./autogen/main
+
+output "cluster_id" {
+  description = "Cluster ID"
+}
+
+output "endpoint" {
+  sensitive   = true
+  description = "Cluster endpoint"
+  value       = local.cluster_endpoint
+  depends_on = [
+    /* Nominally, the endpoint is populated as soon as it is known to Terraform.
+    * However, the cluster may not be in a usable state yet.  Therefore any
+    * resources dependent on the cluster being up will fail to deploy.  With
+    * this explicit dependency, dependent resources can wait for the cluster
+    * to be up.
+    */
+    google_container_cluster.primary,
+    google_container_node_pool.pools,
+  ]
+}

cli/testdata/bpmetadata/tf/empty-module/variables.tf

@@ -0,0 +1,34 @@
+/**
+ * Copyright 2022 Google LLC
+ *
+ * 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.
+ */
+
+// This file was automatically generated from a template in ./autogen/main
+
+variable "" { // Empty variable name
+  description = "The project ID to host the cluster in"
+  required    = false
+}
+
+variable "description" {
+  description = "The description of the cluster"
+  type        = string
+  default     = "some description"
+}
+
+variable "regional" {
+  type        = bool
+  description = "Whether is a regional cluster"
+  default     = true
+}

cli/testdata/bpmetadata/tf/invalid-module/outputs.tf

@@ -0,0 +1,37 @@
+/**
+ * Copyright 2022 Google LLC
+ *
+ * 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.
+ */
+
+// This file was automatically generated from a template in ./autogen/main
+
+output "cluster_id" {
+  description = "Cluster ID"
+}
+
+output "endpoint" {
+  sensitive   = true
+  description = "Cluster endpoint"
+  value       = local.cluster_endpoint
+  depends_on = [
+    /* Nominally, the endpoint is populated as soon as it is known to Terraform.
+    * However, the cluster may not be in a usable state yet.  Therefore any
+    * resources dependent on the cluster being up will fail to deploy.  With
+    * this explicit dependency, dependent resources can wait for the cluster
+    * to be up.
+    */
+    google_container_cluster.primary,
+    google_container_node_pool.pools,
+  ]
+}

cli/testdata/bpmetadata/tf/invalid-module/variables.tf

@@ -0,0 +1,34 @@
+/**
+ * Copyright 2022 Google LLC
+ *
+ * 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.
+ */
+
+// This file was automatically generated from a template in ./autogen/main
+
+variable { // No variable name
+  description = "The project ID to host the cluster in"
+  required    = false
+}
+
+variable "description" {
+  description = "The description of the cluster"
+  type        = string
+  default     = "some description"
+}
+
+variable "regional" {
+  type        = bool
+  description = "Whether is a regional cluster"
+  default     = true
+}