/
dynamodb.go
145 lines (118 loc) · 3.01 KB
/
dynamodb.go
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package dynamodb
import (
"errors"
"fmt"
"os"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/dynamodb"
)
func createServiceClient() (*dynamodb.DynamoDB, error) {
sess, err := session.NewSessionWithOptions(session.Options{
Config: aws.Config{
Region: aws.String("ap-northeast-1"),
Endpoint: aws.String("http://localhost:8000"),
},
})
if err != nil {
return nil, fmt.Errorf("failed to create new session: %w", err)
}
svc := dynamodb.New(sess)
return svc, nil
}
func prepareTable(svc *dynamodb.DynamoDB, tableName string) error {
ok, err := existsTable(svc, tableName)
if err != nil {
return fmt.Errorf("failed to describe table: %w", err)
}
if ok {
fmt.Printf("%s table already active\n", tableName)
return nil
}
err = createTable(svc, tableName)
if err != nil {
return fmt.Errorf("failed to create table: %w", err)
}
input := &dynamodb.DescribeTableInput{TableName: aws.String(tableName)}
err = svc.WaitUntilTableExists(input)
if err != nil {
return fmt.Errorf("failed to wait until table exists: %w", err)
}
fmt.Printf("%s table has been created\n", tableName)
return nil
}
func existsTable(svc *dynamodb.DynamoDB, tableName string) (bool, error) {
input := &dynamodb.DescribeTableInput{TableName: aws.String(tableName)}
output, err := svc.DescribeTable(input)
if err != nil {
var aerr awserr.Error
if errors.As(err, &aerr) {
switch aerr.Code() {
case dynamodb.ErrCodeResourceNotFoundException:
return false, nil
default:
return false, aerr
}
}
}
if *output.Table.TableStatus == "ACTIVE" {
return true, nil
}
return false, nil
}
func createTable(svc *dynamodb.DynamoDB, tableName string) error {
input := &dynamodb.CreateTableInput{
AttributeDefinitions: []*dynamodb.AttributeDefinition{
{
AttributeName: aws.String("build_id"),
AttributeType: aws.String("S"),
},
},
BillingMode: aws.String("PAY_PER_REQUEST"),
KeySchema: []*dynamodb.KeySchemaElement{
{
AttributeName: aws.String("build_id"),
KeyType: aws.String("HASH"),
},
},
StreamSpecification: &dynamodb.StreamSpecification{
StreamEnabled: aws.Bool(true),
StreamViewType: aws.String("NEW_AND_OLD_IMAGES"),
},
TableName: aws.String(tableName),
}
if _, err := svc.CreateTable(input); err != nil {
return fmt.Errorf("failed to create table: %w", err)
}
return nil
}
func printTables(svc *dynamodb.DynamoDB) {
output, err := svc.ListTables(&dynamodb.ListTablesInput{})
if err != nil {
fmt.Printf("%+v\n", err)
return
}
fmt.Println("Tables:")
if len(output.TableNames) == 0 {
fmt.Println(" not found")
return
}
for _, name := range output.TableNames {
fmt.Println(" " + *name)
}
}
func Execute() {
const TableName = "builds"
svc, err := createServiceClient()
if err != nil {
fmt.Printf("%+v\n", err)
os.Exit(1)
}
err = prepareTable(svc, TableName)
if err != nil {
fmt.Printf("%+v\n", err)
os.Exit(1)
}
printTables(svc)
}