go - 具有多个条件的 Dynamo putItem 在 localstack 中不起作用

问题描述

我第一次在本地的玩具项目中直接使用 Dynamo。我正在尝试创建由条件表达式保护的记录-如果用户名（范围键）或 uniqueId（哈希键）已经存在，则失败："attribute_not_exists(UserId) and attribute_not_exists(Username)"。但是，当我使用相同的用户名放置记录时，我没有遇到冲突——并且对表的扫描证实了这一点。我正在使用 localstack（本地 AWS 模拟），如果这有所作为。

问题：

我应该使用事务还是其他抽象？
我在表格设置中构建的键是否错误（见 q 底部）？
我需要在条件中指定键的类型吗？

以下是创建记录的逻辑：

userID := GenerateUniqueID()
record := UserCredentialsRecord{
    UserID:           userID,
    Username:         username,
    Password:         base64.StdEncoding.EncodeToString(hashedPassword),
    Salt:             base64.StdEncoding.EncodeToString(salt),
    Email:            email,
    AccountCreatedTS: time.Now().Unix(),
}
...

input := &dynamodb.PutItemInput{
    Item:                av,
    TableName:           aws.String(userCredentialsTableName),
    ConditionExpression: aws.String("attribute_not_exists(UserId) and attribute_not_exists(Username)"),
}
...

_, err = session.PutItem(input)
if err != nil {
    fmt.Println("Got error calling PutItem:", err.Error())
}

这是 localstack 中的 Dynamo 表：

localstack         | ++ aws --endpoint-url=http://localstack:4566 dynamodb create-table --table-name UserCredentials --attribute-definitions AttributeName=UserID,AttributeType=S AttributeName=Username,AttributeType=S --key-schema AttributeName=UserID,KeyType=HASH AttributeName=Username,KeyType=RANGE --provisioned-throughput ReadCapacityUnits=1,WriteCapacityUnits=1
localstack         | {
localstack         |     "TableDescription": {
localstack         |         "AttributeDefinitions": [
localstack         |             {
localstack         |                 "AttributeName": "UserID",
localstack         |                 "AttributeType": "S"
localstack         |             },
localstack         |             {
localstack         |                 "AttributeName": "Username",
localstack         |                 "AttributeType": "S"
localstack         |             }
localstack         |         ],
localstack         |         "TableName": "UserCredentials",
localstack         |         "KeySchema": [
localstack         |             {
localstack         |                 "AttributeName": "UserID",
localstack         |                 "KeyType": "HASH"
localstack         |             },
localstack         |             {
localstack         |                 "AttributeName": "Username",
localstack         |                 "KeyType": "RANGE"
localstack         |             }
localstack         |         ],
localstack         |         "TableStatus": "ACTIVE",
localstack         |         "CreationDateTime": 1610668286.312,
localstack         |         "ProvisionedThroughput": {
localstack         |             "LastIncreaseDateTime": 0.0,
localstack         |             "LastDecreaseDateTime": 0.0,
localstack         |             "NumberOfDecreasesToday": 0,
localstack         |             "ReadCapacityUnits": 1,
localstack         |             "WriteCapacityUnits": 1
localstack         |         },
localstack         |         "TableSizeBytes": 0,
localstack         |         "ItemCount": 0,
localstack         |         "TableArn": "arn:aws:dynamodb:us-east-1:000000000000:table/UserCredentials"
localstack         |     }
localstack         | }

标签： goamazon-dynamodblocalstack

go - 具有多个条件的 Dynamo putItem 在 localstack 中不起作用

问题描述

解决方案

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