英文:
DynamoDB - Error is ResourceNotFoundException but cast fails in Go
问题
我写了一些代码，尝试使用AWS SDK V2 DynamoDB package在Go中获取表描述：
// 首先，创建到本地DynamoDB的连接
client := dynamodb.NewFromConfig(cfg)
// 接下来，尝试获取与表名相关联的表描述
output, err := client.DescribeTable(ctx, &dynamodb.DescribeTableInput{
TableName: table.TableName,
})
// 现在，如果出现错误，则检查是否为资源未找到异常。如果是，则表示应该创建表；否则，表示有问题，返回错误。如果描述为nil，我们也将创建表
var create bool
if err != nil {
if _, ok := err.(*types.ResourceNotFoundException); !ok {
return err
} else {
create = true
}
} else if output == nil {
create = true
}
在测试期间，这段代码返回了以下错误：
> 操作错误 DynamoDB: DescribeTable，https响应错误 StatusCode: 400，RequestID: 4b0bcb2b-c833-459f-9db2-54841aa1bbd3，ResourceNotFoundException
我遇到的问题是，明显是ResourceNotFoundException，但类型转换不起作用。我需要做其他什么来使其工作吗？
英文:
I wrote some code to attempt to get a table description in Go, using the AWS SDK V2 DynamoDB package:
// First, create a connection to our local DynamoDB
client := dynamodb.NewFromConfig(cfg)
// Next, attempt to get the table description associated with the table name
output, err := client.DescribeTable(ctx, &dynamodb.DescribeTableInput{
TableName: table.TableName,
})
// Now, if we got an error then check if it was a resource-not-found exception. If
// it was then that means we should create the table; otherwise, it means that something
// isn't right so return it. If the description was nil, we'll also create the table
var create bool
if err != nil {
if _, ok := err.(*types.ResourceNotFoundException); !ok {
return err
} else {
create = true
}
} else if output == nil {
create = true
}
During testing, this code returned the following error:
> operation error DynamoDB: DescribeTable, https response error StatusCode: 400, RequestID: 4b0bcb2b-c833-459f-9db2-54841aa1bbd3, ResourceNotFoundException
The problem I'm having is that this is clearly a ResourceNotFoundException but the cast is not working. Is there something else I need to do to get this to work?
答案1
得分: 1
我找到了一个解决方案。首先，我遇到的一个问题是我导入了github.com/aws/aws-sdk-go-v2/service/sso/types而不是github.com/aws/aws-sdk-go-v2/service/dynamodb/types，所以我的类型转换永远不会起作用。话虽如此，进行这个更改并没有解决问题。
在进行日志调试后，我发现v2 SDK将AWS错误包装在*smithy.OperationError类型中。因此，直接转换和使用errors.Is是行不通的。
我在这里做的实际上是将我的错误检查代码更改为：
if temp := new(types.ResourceNotFoundException); !errors.As(err, &temp) {
return err
} else {
create = true
}
英文:
I have found a solution. First, one of the issues I had was that I was importing github.com/aws/aws-sdk-go-v2/service/sso/types instead of github.com/aws/aws-sdk-go-v2/service/dynamodb/types so my cast would never have worked. That being said, making this change did not fix the issue.
After log-debugging, I discovered that the v2 SDK wraps the AWS errors in a *smithy.OperationError type. Therefore, direct-casting and errors.Is won't work.
What I did that actually worked here was to change my error checking code to this:
if temp := new(types.ResourceNotFoundException); !errors.As(err, &temp) {
return err
} else {
create = true
}
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