[英]How to write pseudo parameters in troposphere?
I want to use the pseudo parameter for a TopicConfigurations topics.我想对 TopicConfigurations 主题使用伪参数。 So that I can allow the selection of a arn.这样我就可以允许选择 arn。 How can I write a pseudo parameter using troposphere?如何使用对流层编写伪参数?
Topic Configuration: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-s3-bucket-notificationconfig-topicconfig.html主题配置: http : //docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-s3-bucket-notificationconfig-topicconfig.html
Psuedo Parameter: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/pseudo-parameter-reference.html伪参数: http ://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/pseudo-parameter-reference.html
我认为这应该是它,来自对流层/ init .py:
Ref(AWS_NOTIFICATION_ARNS))
You would just use the name of the parameter, in a Ref() call, like so:您只需在 Ref() 调用中使用参数名称,如下所示:
Ref("AWS::NotificationARNs")
I use that all the time, mostly with "AWS::NoValue" or "AWS::Region" in most of my use cases.我一直使用它,在我的大多数用例中主要使用“AWS::NoValue”或“AWS::Region”。
Good luck!祝你好运!
Example using Fn::Join, AWS::Region and AWS::AccountId to form an ARN使用 Fn::Join、AWS::Region 和 AWS::AccountId 形成 ARN 的示例
# Region and AccountId are pseudo parameters
from troposphere import Join, Region, AccountId
cloudwatch_log_arn = Join(
":", ["arn", "aws", "logs", Region, AccountId, "log-group", "log-name"]
)
Pseudo parameters are used with the Ref function, but each of them is defined as a separate object in Troposphere :伪参数与 Ref 函数一起使用,但它们中的每一个都被定义为对流层中的一个单独对象:
AccountId = Ref(AWS_ACCOUNT_ID)
NotificationARNs = Ref(AWS_NOTIFICATION_ARNS)
NoValue = Ref(AWS_NO_VALUE)
Partition = Ref(AWS_PARTITION)
Region = Ref(AWS_REGION)
StackId = Ref(AWS_STACK_ID)
StackName = Ref(AWS_STACK_NAME)
URLSuffix = Ref(AWS_URL_SUFFIX)
So they can be imported and used directly, as in the example above.因此它们可以直接导入和使用,如上例所示。
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