DynamoDB: connection refused #1045

Dregorio1 · 2023-04-13T17:04:39Z

Dregorio1
Apr 13, 2023

Hello, I have code

"context"
"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"
"github.com/testcontainers/testcontainers-go/wait"
"github.com/testcontainers/testcontainers-go"
 
func (c *TestContext) ConnectToDynamoDB() (*dynamodb.Client, error) {
	ctx := context.Background()
	// create a container request for DynamoDB
	req := testcontainers.ContainerRequest{
		Image:        "amazon/dynamodb-local:latest",
		Cmd:          []string{"-jar", "DynamoDBLocal.jar", "-inMemory"},
		ExposedPorts: []string{"8000/tcp"},
		WaitingFor:   wait.NewHostPortStrategy("8000"),
	}
 
	d, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
		ContainerRequest: req,
		Started:          true,
	})
	if err != nil {
		return nil, err
	}
 
	defer d.Terminate(ctx)
 
	ip, err := d.Host(ctx)
	if err != nil {
		return nil, err
	}
 
	port, err := d.MappedPort(ctx, "8000")
	if err != nil {
		return nil, err
	}
 
	cfg, err := config.LoadDefaultConfig(ctx,
		config.WithEndpointResolverWithOptions(aws.EndpointResolverWithOptionsFunc(func(service, region string, options ...interface{}) (aws.Endpoint, error) {
			return aws.Endpoint{
				URL: fmt.Sprintf("http://%s:%s", ip, port),
			}, nil
		})),
		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 {
		return nil, err
	}
 
	db := dynamodb.NewFromConfig(cfg)
 
    // test
	listTab, err := db.ListTables(ctx, &dynamodb.ListTablesInput{})
	if err != nil {
		return nil, err
	}
 
	return db, nil
}

db.ListTables return // failed to setup the DynamoDB for the test (operation error DynamoDB: ListTables, exceeded maximum number of attempts, 3, https response error StatusCode: 0, RequestID: , request send failed, Post "https://localhost:32849/tcp/": dial tcp 127.0.0.1:32849: connect: connection refused) - What do I wrong? I want to write UT for DynamoDB

mdelapenya · 2023-04-13T17:30:19Z

mdelapenya
Apr 13, 2023
Maintainer

I'd need more time for reproducing it, but on the meantime í want to check if you already took a look to the localstack module 🤔

4 replies

Dregorio1 Apr 13, 2023
Author

@mdelapenya Thank you for the answer. I did not look at this localstack I will do that now

Dregorio1 Apr 14, 2023
Author

@mdelapenya I have change my code to use localstack, works better, but still has some problems. I have added container logs. New code:

	"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"
	_ "github.com/docker/go-connections/nat"
	"github.com/testcontainers/testcontainers-go"
	"github.com/testcontainers/testcontainers-go/modules/localstack"
 
func (c *TestContext) ConnectToDynamoDB() (error) {
	container, err := localstack.StartContainer(c.Ctx, localstack.NoopOverrideContainerRequest)
	if err != nil {
		return err
	}
 
	g := TestLogConsumer{
		Msgs: []string{},
	}
	container.FollowOutput(&g)
	err = container.StartLogProducer(c.Ctx)
	if err != nil {
		return err
	}
 
	mappedPort, err := container.MappedPort(c.Ctx, "4566/tcp")
	if err != nil {
		return err
	}
 
	provider, err := testcontainers.NewDockerProvider()
	if err != nil {
		return err
	}
	defer provider.Client().Close()
 
	host, err := provider.DaemonHost(c.Ctx)
	if err != nil {
		return err
	}
 
	cfg, err := config.LoadDefaultConfig(c.Ctx,
		config.WithEndpointResolverWithOptions(aws.EndpointResolverWithOptionsFunc(func(service, region string, options ...interface{}) (aws.Endpoint, error) {
			return aws.Endpoint{
				URL: fmt.Sprintf("http://%s:%d", host, mappedPort.Int()),
			}, nil
		})),
		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 {
		return err
	}
 
	db = dynamodb.NewFromConfig(cfg)
 
	_, err = db.CreateTable(c.Ctx, &dynamodb.CreateTableInput{
		AttributeDefinitions: []types.AttributeDefinition{{
			AttributeName: aws.String("ID"),
			AttributeType: types.ScalarAttributeTypeS,
		}},
		KeySchema: []types.KeySchemaElement{{
			AttributeName: aws.String("ID"),
			KeyType:       types.KeyTypeHash,
		}},
		TableName: aws.String(tableName),
		ProvisionedThroughput: &types.ProvisionedThroughput{
			ReadCapacityUnits:  aws.Int64(10),
			WriteCapacityUnits: aws.Int64(10),
		},
	})
	if err != nil {
		return err
	}
 
	waiter := dynamodb.NewTableExistsWaiter(db)
	err = waiter.Wait(c.Ctx, &dynamodb.DescribeTableInput{
		TableName: aws.String(tableName)}, 30*time.Second)
	if err != nil {
		return fmt.Errorf("Wait for table exists failed. Here's why: %v\n", err)
	}
 
	if err = PostData(db, []Data{bla, bla2}); err != nil { //db.Scan(...)
		return err
	}
 
	return nil
}

And logs from container:

LocalStack version: 1.4.0
LocalStack Docker container id: 09917432ab77
LocalStack build date: 2023-02-13
LocalStack build git hash: dde691c8
 
2023-04-14 11:56:19,021 INFO success: infra entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2023-04-14T11:56:19.492  WARN --- [-functhread5] hypercorn.error            : ASGI Framework Lifespan error, continuing without Lifespan support
2023-04-14T11:56:19.492  WARN --- [-functhread5] hypercorn.error            : ASGI Framework Lifespan error, continuing without Lifespan support
2023-04-14T11:56:19.493  INFO --- [-functhread5] hypercorn.error            : Running on https://0.0.0.0:4566 (CTRL + C to quit)
2023-04-14T11:56:19.493  INFO --- [-functhread5] hypercorn.error            : Running on https://0.0.0.0:4566 (CTRL + C to quit)
2023-04-14T11:56:19.796  INFO --- [  MainThread] localstack.utils.bootstrap : Execution of "start_runtime_components" took 1726.88ms
Ready.
2023-04-14T11:56:20.088  INFO --- [-functhread9] l.services.dynamodb.server : Initializing DynamoDB Local with the following configuration:
2023-04-14T11:56:20.088  INFO --- [-functhread9] l.services.dynamodb.server : Port:	56513
2023-04-14T11:56:20.088  INFO --- [-functhread9] l.services.dynamodb.server : InMemory:	false
2023-04-14T11:56:20.088  INFO --- [-functhread9] l.services.dynamodb.server : DbPath:	/var/lib/localstack/tmp/state/dynamodb
2023-04-14T11:56:20.088  INFO --- [-functhread9] l.services.dynamodb.server : SharedDb:	false
2023-04-14T11:56:20.088  INFO --- [-functhread9] l.services.dynamodb.server : shouldDelayTransientStatuses:	false
2023-04-14T11:56:20.088  INFO --- [-functhread9] l.services.dynamodb.server : CorsParams:	null
2023-04-14T11:56:20.096  INFO --- [-functhread9] l.services.dynamodb.server : 
2023-04-14T11:56:21.189  INFO --- [   asgi_gw_0] localstack.utils.bootstrap : Execution of "require" took 1611.36ms
2023-04-14T11:56:21.261  INFO --- [   asgi_gw_0] localstack.request.aws     : AWS dynamodb.ListTables => 200
2023-04-14T11:56:21.352  INFO --- [   asgi_gw_0] localstack.request.aws     : AWS dynamodb.CreateTable => 200
2023-04-14T11:56:23.613  INFO --- [   asgi_gw_1] localstack.request.aws     : AWS dynamodb.DescribeTable => 400 (ResourceNotFoundException)
2023-04-14T11:56:33.615  INFO --- [   asgi_gw_1] localstack.request.aws     : AWS dynamodb.DescribeTable => 400 (ResourceNotFoundException)

The same code works, when I run it on container running by myself.

mdelapenya Apr 14, 2023
Maintainer

Ok, let me find time to reproduce your code snippet. Hopefully soon :)

BTW, in the next release we are deprecating how the localstack module is started, please take a look at https://golang.testcontainers.org/modules/localstack/#usage-example (applies to the current dev-next release)

mdelapenya Apr 24, 2023
Maintainer

Hey @Dregorio1 I'm able to run this code snippet, directly using the localstack module, as a dynamodb_test.go file into the v2 test package:

package v2_test

import (
	"context"
	"fmt"
	"testing"
	"time"

	"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"
	"github.com/stretchr/testify/require"
	"github.com/testcontainers/testcontainers-go"
	"github.com/testcontainers/testcontainers-go/modules/localstack"
)

type TestLogConsumer struct {
	Msgs []string
}

func (lc *TestLogConsumer) Accept(l testcontainers.Log) {
	fmt.Print(string(l.Content))
}

func TestConnectToDynamoDB(t *testing.T) {
	ctx := context.Background()

	container, err := localstack.RunContainer(ctx, testcontainers.WithImage("localstack/localstack:2.0.0"))
	require.Nil(t, err)

	g := TestLogConsumer{
		Msgs: []string{},
	}
	container.FollowOutput(&g)
	err = container.StartLogProducer(ctx)
	require.Nil(t, err)

	mappedPort, err := container.MappedPort(ctx, "4566/tcp")
	require.Nil(t, err)

	provider, err := testcontainers.NewDockerProvider()
	require.Nil(t, err)
	defer provider.Close()

	host, err := provider.DaemonHost(ctx)
	require.Nil(t, err)

	cfg, err := config.LoadDefaultConfig(ctx,
		config.WithEndpointResolverWithOptions(aws.EndpointResolverWithOptionsFunc(func(service, region string, options ...interface{}) (aws.Endpoint, error) {
			return aws.Endpoint{
				URL: fmt.Sprintf("http://%s:%d", host, mappedPort.Int()),
			}, nil
		})),
		config.WithCredentialsProvider(credentials.StaticCredentialsProvider{
			Value: aws.Credentials{
				AccessKeyID: "dummy", SecretAccessKey: "dummy", SessionToken: "dummy",
				Source: "Hard-coded credentials; values are irrelevant for local DynamoDB",
			},
		}),
	)
	require.Nil(t, err)

	db := dynamodb.NewFromConfig(cfg)

	tableName := "tableName"

	_, err = db.CreateTable(ctx, &dynamodb.CreateTableInput{
		AttributeDefinitions: []types.AttributeDefinition{{
			AttributeName: aws.String("ID"),
			AttributeType: types.ScalarAttributeTypeS,
		}},
		KeySchema: []types.KeySchemaElement{{
			AttributeName: aws.String("ID"),
			KeyType:       types.KeyTypeHash,
		}},
		TableName: aws.String(tableName),
		ProvisionedThroughput: &types.ProvisionedThroughput{
			ReadCapacityUnits:  aws.Int64(10),
			WriteCapacityUnits: aws.Int64(10),
		},
	})
	require.Nil(t, err)

	waiter := dynamodb.NewTableExistsWaiter(db)
	err = waiter.Wait(ctx, &dynamodb.DescribeTableInput{
		TableName: aws.String(tableName)}, 30*time.Second)
	require.Nil(t, err, "Wait for table exists failed. Here's why: %v\n", err)
}

The test fails, but I think because the waiter cannot find the new table, which is something escapes to my localstack/dynamodb knowledge:

Testcontainers properties file has been found: /Users/mdelapenya/.testcontainers.properties
2023/04/24 11:42:24 github.com/testcontainers/testcontainers-go - Connected to docker: 
  Server Version: 20.10.23
  API Version: 1.41
  Operating System: Docker Desktop
  Total Memory: 7851 MB
Setting HOSTNAME_EXTERNAL to localhost (to match host-routable address for container)
2023/04/24 11:42:24 🐳 Creating container for image docker.io/testcontainers/ryuk:0.4.0
2023/04/24 11:42:24 ✅ Container created: ecac64f412e0
2023/04/24 11:42:24 🐳 Starting container: ecac64f412e0
2023/04/24 11:42:24 🚧 Waiting for container id ecac64f412e0 image: docker.io/testcontainers/ryuk:0.4.0
2023/04/24 11:42:24 ✅ Container started: ecac64f412e0
2023/04/24 11:42:51 🐳 Creating container for image localstack/localstack:2.0.0
2023/04/24 11:42:52 ✅ Container created: 76357572178e
2023/04/24 11:42:52 🐳 Starting container: 76357572178e
2023/04/24 11:42:52 🚧 Waiting for container id 76357572178e image: localstack/localstack:2.0.0
2023/04/24 11:42:55 ✅ Container started: 76357572178e

LocalStack version: 2.0.0
LocalStack Docker container id: 76357572178e
LocalStack build date: 2023-03-30
LocalStack build git hash: 7d80ee7f

2023-04-24T09:42:53.513  WARN --- [  MainThread] localstack.deprecations    : HOSTNAME_EXTERNAL is deprecated (since 2.0.0) and will be removed in upcoming releases of LocalStack! This configuration will be migrated to LOCALSTACK_HOST
2023-04-24T09:42:53.997  WARN --- [-functhread5] hypercorn.error            : ASGI Framework Lifespan error, continuing without Lifespan support
2023-04-24T09:42:53.997  WARN --- [-functhread5] hypercorn.error            : ASGI Framework Lifespan error, continuing without Lifespan support
2023-04-24T09:42:53.998  INFO --- [-functhread5] hypercorn.error            : Running on https://0.0.0.0:4566 (CTRL + C to quit)
2023-04-24T09:42:53.998  INFO --- [-functhread5] hypercorn.error            : Running on https://0.0.0.0:4566 (CTRL + C to quit)
2023-04-24T09:42:54.222  INFO --- [  MainThread] localstack.utils.bootstrap : Execution of "start_runtime_components" took 610.09ms
Ready.
2023-04-24T09:43:27.561  INFO --- [functhread13] l.services.dynamodb.server : Initializing DynamoDB Local with the following configuration:
2023-04-24T09:43:27.562  INFO --- [functhread13] l.services.dynamodb.server : Port:	55281
2023-04-24T09:43:27.562  INFO --- [functhread13] l.services.dynamodb.server : InMemory:	false
2023-04-24T09:43:27.562  INFO --- [functhread13] l.services.dynamodb.server : DbPath:	/var/lib/localstack/tmp/state/dynamodb
2023-04-24T09:43:27.562  INFO --- [functhread13] l.services.dynamodb.server : SharedDb:	false
2023-04-24T09:43:27.563  INFO --- [functhread13] l.services.dynamodb.server : shouldDelayTransientStatuses:	false
2023-04-24T09:43:27.563  INFO --- [functhread13] l.services.dynamodb.server : CorsParams:	null
2023-04-24T09:43:27.574  INFO --- [functhread13] l.services.dynamodb.server : 
2023-04-24T09:43:29.175  INFO --- [   asgi_gw_0] localstack.utils.bootstrap : Execution of "require" took 33656.61ms
2023-04-24T09:43:29.380  INFO --- [   asgi_gw_0] localstack.request.aws     : AWS dynamodb.CreateTable => 200
2023-04-24T09:43:29.402  INFO --- [   asgi_gw_1] localstack.request.aws     : AWS dynamodb.DescribeTable => 400 (ResourceNotFoundException)
2023-04-24T09:43:39.428  INFO --- [   asgi_gw_1] localstack.request.aws     : AWS dynamodb.DescribeTable => 400 (ResourceNotFoundException)
--- FAIL: TestConnectToDynamoDB (75.04s)
    dynamodb_test.go:89: 
        	Error Trace:	/Users/mdelapenya/sourcecode/src/github.com/testcontainers/testcontainers-go/modules/localstack/v2/dynamodb_test.go:89
        	Error:      	Expected nil, but got: &errors.errorString{s:"exceeded max wait time for TableExists waiter"}
        	Test:       	TestConnectToDynamoDB
        	Messages:   	Wait for table exists failed. Here's why: exceeded max wait time for TableExists waiter
FAIL

I think you should use the module and customize with your own needs to complete your scenario

mdelapenya · 2023-10-05T08:19:53Z

mdelapenya
Oct 5, 2023
Maintainer

@Dregorio1 I think we can close this discussion after my previous comments. Please feel free to reopen if you need it.

0 replies

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