// ensureTableExists creates a DynamoDB table with a given
// DynamoDB client. If the table already exists, it is not
// being reconfigured.
func ensureTableExists(client *dynamodb.DynamoDB, table string, readCapacity, writeCapacity int) error {
_, err := client.DescribeTable(&dynamodb.DescribeTableInput{
TableName: aws.String(table),
})
if awserr, ok := err.(awserr.Error); ok {
if awserr.Code() == "ResourceNotFoundException" {
_, err = client.CreateTable(&dynamodb.CreateTableInput{
TableName: aws.String(table),
ProvisionedThroughput: &dynamodb.ProvisionedThroughput{
ReadCapacityUnits: aws.Int64(int64(readCapacity)),
WriteCapacityUnits: aws.Int64(int64(writeCapacity)),
},
KeySchema: []*dynamodb.KeySchemaElement{{
AttributeName: aws.String("Path"),
KeyType: aws.String("HASH"),
}, {
AttributeName: aws.String("Key"),
KeyType: aws.String("RANGE"),
}},
AttributeDefinitions: []*dynamodb.AttributeDefinition{{
AttributeName: aws.String("Path"),
AttributeType: aws.String("S"),
}, {
AttributeName: aws.String("Key"),
AttributeType: aws.String("S"),
}},
})
if err != nil {
return err
}
err = client.WaitUntilTableExists(&dynamodb.DescribeTableInput{
TableName: aws.String(table),
})
if err != nil {
return err
}
}
}
if err != nil {
return err
}
return nil
}
// make sure session table exists
func tryCreateTable(db *dynamodb.DynamoDB, sessionTableName string, readCapacityUnits, writeCapacityUnits int64) error {
describeTableInput := &dynamodb.DescribeTableInput{TableName: aws.String(sessionTableName)}
if _, err := db.DescribeTable(describeTableInput); err != nil {
awserr := err.(awserr.Error)
if awserr.Code() == "ResourceNotFoundException" {
// table does not exist - create now
params := &dynamodb.CreateTableInput{
TableName: aws.String(sessionTableName),
AttributeDefinitions: []*dynamodb.AttributeDefinition{ // Required
{ // Required
AttributeName: aws.String("id"),
AttributeType: aws.String("S"), // Required
},
},
KeySchema: []*dynamodb.KeySchemaElement{ // Required
{ // Required
AttributeName: aws.String("id"),
KeyType: aws.String("HASH"), // Required
},
},
ProvisionedThroughput: &dynamodb.ProvisionedThroughput{
ReadCapacityUnits: aws.Int64(readCapacityUnits),
WriteCapacityUnits: aws.Int64(writeCapacityUnits),
},
}
if _, err := db.CreateTable(params); err != nil {
return err
}
} else {
return err
}
}
return nil
}