Merge pull request #281 from loheagn/hack_validation_backend

Add `tf_validation_backend` tool to the `hack` dir
kubevela · Mar 17, 2022 · 9bdd567 · 9bdd567
2 parents 69baabd + 7810dc2
commit 9bdd567
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diff --git a/hack/tool/validation/tf_validation_backend/README.md b/hack/tool/validation/tf_validation_backend/README.md
@@ -0,0 +1,24 @@
+# tf_validation_backend
+
+This module shows how to fetch the backend block from a Terraform configuration file.
+
+## How to use
+
+You can run the `tf_validation_backend.go` to fetch the backend name from a `.tf` file.
+
+```bash
+go run tf_validation_backend.go ${path_to_your_tf_file}
+```
+
+## What's more
+
+Actually, the function `fetchBackendName` in `tf_validation_backend.go` is just a simple demo. You can extend it to get more information about the backend configuration. As you can see, all the attributes and blocks in the backend block are parsed into the `Remain` field which type is [hcl.Body](https://pkg.go.dev/github.com/hashicorp/hcl/v2@v2.11.1?utm_source=gopls#Body). We can get all the information by accessing the fields of the [hcl.Body](https://pkg.go.dev/github.com/hashicorp/hcl/v2@v2.11.1?utm_source=gopls#Body).
+
+For example, the following code prints all the keys of the attributes of the backend block.
+
+```go
+attrsMap, _ := config.Terraform.Backend.Remain.JustAttributes()
+for k := range attrsMap {
+    fmt.Println(k)
+}
+```
diff --git a/hack/tool/validation/tf_validation_backend/go.mod b/hack/tool/validation/tf_validation_backend/go.mod
@@ -0,0 +1,14 @@
+module tf_validation_backend
+
+go 1.17
+
+require github.com/hashicorp/hcl/v2 v2.11.1
+
+require (
+	github.com/agext/levenshtein v1.2.3 // indirect
+	github.com/apparentlymart/go-textseg/v13 v13.0.0 // indirect
+	github.com/google/go-cmp v0.5.7 // indirect
+	github.com/mitchellh/go-wordwrap v1.0.1 // indirect
+	github.com/zclconf/go-cty v1.10.0 // indirect
+	golang.org/x/text v0.3.7 // indirect
+)
diff --git a/hack/tool/validation/tf_validation_backend/go.sum b/hack/tool/validation/tf_validation_backend/go.sum
@@ -0,0 +1,68 @@
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diff --git a/hack/tool/validation/tf_validation_backend/tf_validation_backend.go b/hack/tool/validation/tf_validation_backend/tf_validation_backend.go
@@ -0,0 +1,71 @@
+/*
+Copyright 2022 The KubeVela Authors.
+
+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 main
+
+import (
+	"errors"
+	"log"
+	"os"
+
+	"github.com/hashicorp/hcl/v2"
+	"github.com/hashicorp/hcl/v2/gohcl"
+	"github.com/hashicorp/hcl/v2/hclparse"
+)
+
+// Config describes the schema of a whole tf file.
+type Config struct {
+	Remain    interface{} `hcl:",remain"`
+	Terraform struct {
+		Remain  interface{}    `hcl:",remain"`
+		Backend *BackendConfig `hcl:"backend,block"`
+	} `hcl:"terraform,block"`
+}
+
+// BackendConfig describes the schema of the backend block.
+type BackendConfig struct {
+	Name   string   `hcl:"name,label"`
+	Remain hcl.Body `hcl:",remain"`
+}
+
+func fetchBackendName(body hcl.Body) (string, error) {
+	var config Config
+	diags := gohcl.DecodeBody(body, nil, &config)
+	if diags.HasErrors() {
+		return "", diags
+	}
+	backendConf := config.Terraform.Backend
+	if backendConf == nil {
+		return "", errors.New("can not find the \"backend block\"")
+	}
+	return backendConf.Name, nil
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		log.Fatalln("can not parse filename from args")
+	}
+	filename := os.Args[1]
+	file, diags := hclparse.NewParser().ParseHCLFile(filename)
+	if diags.HasErrors() {
+		log.Fatalln(diags.Error())
+	}
+	backendName, err := fetchBackendName(file.Body)
+	if err != nil {
+		log.Fatalln(err.Error())
+	}
+	log.Printf("fetch the name of backend: %s\n", backendName)
+}
diff --git a/hack/tool/validation/tf_validation_backend/tf_validation_backend_test.go b/hack/tool/validation/tf_validation_backend/tf_validation_backend_test.go
@@ -0,0 +1,94 @@
+/*
+Copyright 2022 The KubeVela Authors.
+
+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 main
+
+import (
+	"testing"
+
+	"github.com/hashicorp/hcl/v2/hclparse"
+)
+
+func Test_fetchBackendName(t *testing.T) {
+	tests := []struct {
+		name    string
+		hcl     string
+		want    string
+		wantErr bool
+	}{
+		{
+			name: "valid backend block",
+			hcl: `
+			  terraform {
+				backend "remote" {
+				  workspace {
+					prefix = "test_"
+				  }
+				}
+			  }
+			`,
+			want:    "remote",
+			wantErr: false,
+		},
+		{
+			name: "empty backend block",
+			hcl: `
+			  terraform {
+				backend "remote" {
+				}
+			  }
+			`,
+			want:    "remote",
+			wantErr: false,
+		},
+		{
+			name: "invalid backend block",
+			hcl: `
+			  terraform {
+				backend {
+				  workspace {
+					prefix = "test_"
+				  }
+				}
+			  }
+			`,
+			want:    "",
+			wantErr: true,
+		},
+		{
+			name: "no backend block",
+			hcl: `
+			  terraform {
+			  }
+			`,
+			want:    "",
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			file, _ := hclparse.NewParser().ParseHCL([]byte(tt.hcl), "test.tf")
+			got, err := fetchBackendName(file.Body)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("fetchBackendName() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("fetchBackendName() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}