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Day09 串接DynamoDB-02

15th鐵人賽
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我們今天要來寫code測試Local的DynamoDB，我們找一個實際的例子來測試，目前想到會有需要存的就是使用者Google OAuth的token，我們不會希望每次要調用Google Drive的時候，都一直要你登入google進行授權，因此我們會把授權成功後拿到的token資訊存到DynamoDB去。

  1. 首先第一步就是開一個資料夾，建立4個檔案，dynamodb.go放一些操作dynamodb通用的一些function，oauth.go放處理剛剛說的token的相關方法，並建立對應的Unit test。

    https://ithelp.ithome.com.tw/upload/images/20230924/201159900NITwEAyJj.png

  2. 接著到oauth.go建立GoogleOAuthToken的struct，關於如何取得真正的token，我們到真的處理Google OAuth的部份在說明，今天先確保到DynamoDB沒問題就好。

    // oauth.go
type GoogleOAuthToken struct {
	PK           string `dynamodbav:"PK"`
	AccessToken  string `dynamodbav:"access_token"`
	TokenType    string `dynamodbav:"token_type"`
	RefreshToken string `dynamodbav:"refresh_token"`
	Expiry       string `dynamodbav:"expiry"`
}

  3. 知道我們要操作的結構後，我們回到dynamodb.go，創建TableBasics最為基礎結構

    // dynamodb.go
package dynamodb

import (
  "context"
	"errors"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/credentials"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}

func NewTableBasics(tableName string) *TableBasics {
	cfg, err := config.LoadDefaultConfig(context.TODO())
	if err != nil {
		panic(err)
	}

	client := dynamodb.NewFromConfig(cfg)
	return &TableBasics{
		DynamoDbClient: client,
		TableName:      tableName,
	}
}

  4. 下面加上CreateLocalClient，建立一個連線到地端的*dynamodb.Client，如果是平時在本機端開發，我們使用這個function得到的Client

    // dynamodb.go
func CreateLocalClient(port int) *dynamodb.Client {
	cfg, err := config.LoadDefaultConfig(context.TODO(),
		config.WithRegion("ap-northeast-1"),
		config.WithCredentialsProvider(credentials.StaticCredentialsProvider{
			Value: aws.Credentials{
				AccessKeyID: "dummy", SecretAccessKey: "dummy", SessionToken: "dummy",
				Source: "Hard-coded credentials; values are irrelevant for local DynamoDB",
			},
		}),
	)
	if err != nil {
		panic(err)
	}
	dsn := fmt.Sprintf("http://localhost:%d/", port)
	return dynamodb.NewFromConfig(cfg, func(o *dynamodb.Options) {
		o.BaseEndpoint = aws.String(dsn)
	})
}

  5. 接著打開dynamodb_test.go，我們將其作為測試的主要進入口(TestMain)，建立一個TableBasics結構，其中TableName存"google-oauth”，再把原本的DynamoDbClient替換成CreateLocalClient產生的，讓他連線到我們昨天開在8000port的local dynamodb，這樣之後其他unit test直接操作初始化好的testTableBasics就好了~

    // dynamodb_test.go
package dynamodb

import (
	"os"
	"testing"
)

var testTableBasics *TableBasics

func TestMain(m *testing.M) {
	// google_oauth
	testTableBasics = NewTableBasics("google-oauth")
	// change to local dynamodb
	testTableBasics.DynamoDbClient = CreateLocalClient(8000)
	os.Exit(m.Run())
}

  6. 再來回到oauth.go，補上建立table的方法 (從TableBasics拿出TableName，調用DynamoDbClient.CreateTable來建立table)

    //oauth.go
package dynamodb

import (
	"context"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

type GoogleOAuthToken struct {
	PK           string `dynamodbav:"PK"`
	AccessToken  string `dynamodbav:"access_token"`
	TokenType    string `dynamodbav:"token_type"`
	RefreshToken string `dynamodbav:"refresh_token"`
	Expiry       string `dynamodbav:"expiry"`
}

func (basics TableBasics) CreateGoogleOAuthTable() (*types.TableDescription, error) {
	var tableDesc *types.TableDescription
	table, err := basics.DynamoDbClient.CreateTable(context.TODO(), &dynamodb.CreateTableInput{

		AttributeDefinitions: []types.AttributeDefinition{
			{
				AttributeName: aws.String("PK"),
				AttributeType: types.ScalarAttributeTypeS,
			},
		},
		KeySchema: []types.KeySchemaElement{{
			AttributeName: aws.String("PK"),
			KeyType:       types.KeyTypeHash,
		}},
		TableName: aws.String(basics.TableName),
		ProvisionedThroughput: &types.ProvisionedThroughput{
			ReadCapacityUnits:  aws.Int64(10),
			WriteCapacityUnits: aws.Int64(10),
		},
	})
	if err != nil {
		log.Printf("Couldn't create table %v. Here's why: %v\n", basics.TableName, err)
	} else {
		waiter := dynamodb.NewTableExistsWaiter(basics.DynamoDbClient)
		err = waiter.Wait(context.TODO(), &dynamodb.DescribeTableInput{
			TableName: aws.String(basics.TableName)}, 5*time.Minute)
		if err != nil {
			log.Printf("Wait for table exists failed. Here's why: %v\n", err)
		}
		tableDesc = table.TableDescription
	}
	return tableDesc, err
}

  7. 接著我們將PK設計為Line的User UUID，因此我們會在碰到PK的地方都加上"LINEID#”的prefix，然後補上對應的CRUD就好哩

    //oauth.go
const PK_PREFIX_LINE = "LINEID#"

// Get PK Key (with Line prefix)
func (tok GoogleOAuthToken) GetKey() map[string]types.AttributeValue {
	// Add prefix to PK
	line_userid, err := attributevalue.Marshal(PK_PREFIX_LINE + tok.PK)
	if err != nil {
		panic(err)
	}

	return map[string]types.AttributeValue{"PK": line_userid}
}

  8. 新增GoogleOAuthToken

    //oauth.go
func (basics TableBasics) AddGoogleOAuthToken(tok GoogleOAuthToken) error {
	tok.PK = PK_PREFIX_LINE + tok.PK
	item, err := attributevalue.MarshalMap(tok)
	if err != nil {
		panic(err)
	}
	_, err = basics.DynamoDbClient.PutItem(context.TODO(), &dynamodb.PutItemInput{
		TableName: aws.String(basics.TableName), Item: item,
	})
	if err != nil {
		log.Printf("Couldn't add item to table. Here's why: %v\n", err)
	}
	return err
}

  9. 更新GoogleOAuthToken

    //oauth.go
func (basics TableBasics) TxUpdateGoogleOAuthToken(tok GoogleOAuthToken) (*dynamodb.TransactWriteItemsOutput, error) {
	var err error
	var response *dynamodb.TransactWriteItemsOutput

	update := expression.Set(expression.Name("refresh_token"), expression.Value(tok.RefreshToken))
	update.Set(expression.Name("access_token"), expression.Value(tok.AccessToken))
	expr, err := expression.NewBuilder().WithUpdate(update).Build()
	if err != nil {
		log.Printf("Couldn't build expression for update. Here's why: %v\n", err)
	} else {
		twii := &dynamodb.TransactWriteItemsInput{
			TransactItems: []types.TransactWriteItem{
				{
					Update: &types.Update{
						Key:                       tok.GetKey(),
						TableName:                 aws.String(basics.TableName),
						ExpressionAttributeNames:  expr.Names(),
						ExpressionAttributeValues: expr.Values(),
						UpdateExpression:          expr.Update(),
					},
				},
			},
		}
		response, err = basics.DynamoDbClient.TransactWriteItems(context.TODO(), twii)
		if err != nil {
			log.Printf("Couldn't trasnaciton update tok %v. Here's why: %v\n", tok.PK, err)
		}
	}

	return response, err
}

  10. 取得GoogleOAuthToken

    //oauth.go
func (basics TableBasics) GetGoogleOAuthToken(line_userid string) (GoogleOAuthToken, error) {
	tok := GoogleOAuthToken{PK: line_userid}
	response, err := basics.DynamoDbClient.GetItem(context.TODO(), &dynamodb.GetItemInput{
		Key: tok.GetKey(), TableName: aws.String(basics.TableName),
	})
	if err != nil {
		log.Printf("Couldn't get info about %v. Here's why: %v\n", line_userid, err)
	} else {
		err = attributevalue.UnmarshalMap(response.Item, &tok)
		if err != nil {
			log.Printf("Couldn't unmarshal response. Here's why: %v\n", err)
		}
	}
	return tok, err
}

到這邊基本的操作就寫好了，我們到oauth_test.go來測試一下，執行單個個別的測試，可以配合昨天http://localhost:8001/ 上的GUI看一下效果，確認一下都有正確的執行就沒問題摟~

// oauth_test.go
package dynamodb

import (
	"testing"
	"github.com/stretchr/testify/assert"
)

func TestCreateGoogleOAuthTable(t *testing.T) {
	tableDesc, err := testTableBasics.CreateGoogleOAuthTable()
	t.Log("tableDesc:", tableDesc)
	t.Log("ERROR:", err)
	assert.NoError(t, err, "Expected no error creating table")
	assert.NotNil(t, tableDesc, "Table description should not be nil")
}

func TestAddGoogleOAuthToken(t *testing.T) {
	tok := GoogleOAuthToken{
		PK:           "test1234",
		AccessToken:  "test123",
		TokenType:    "Bearer",
		RefreshToken: "test123",
		Expiry:       "2023-09-24T11:31:54.2936004+08:00",
	}
	err := testTableBasics.AddGoogleOAuthToken(tok)
	if err != nil {
		t.Log("ERROR:", err)
	}
}

func TestTxUpdateGoogleOAuthToken(t *testing.T) {
	tok := GoogleOAuthToken{
		PK:          "test1234",
		AccessToken: "test123456",
		RefreshToken: "test123456",
	
	}
	output, err := testTableBasics.TxUpdateGoogleOAuthToken(tok)
	t.Log("output:", output)
	if err != nil {
		t.Log("ERROR:", err)
	}
}

func TestGetGoogleOAuthToken(t *testing.T) {
	tok, err := testTableBasics.GetGoogleOAuthToken("test1234")
	if err != nil {
		t.Log(err)
	}
	t.Log("Get Token:", tok)
}

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Day08 串接DynamoDB-01 (Cloud+Local)
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