如何在CDK中提取字符串列表的参数？

发布于 2025-02-13 08:13:12 字数 1090 浏览 3 评论 0原文

我正在尝试在CDK应用中提取StringList的现有SSM参数。

我可以存储一个值，但是为了避免重复代码，我试图将3个值存储在单个变量中，并以符号访问数组value [0]

        const stringValue = ssm.StringParameter.fromStringParameterAttributes(this, 'MyValue', 
    
        const stringValue2 = ssm.StringListParameter.fromStringListParameterName(this, 'myValue', '/dev/name')
    
        const ssmstringlistoutput = new cdk.CfnOutput(this, 'ssmoutput', {
          value: cdk.Fn.select(0, stringValue2.stringListValue),
          description: 'name of ssmlist',
          exportName: 'avatarsBucket',
        });
    
    
        // Chatbot Slack Notification Integration
        const bot = new chat.SlackChannelConfiguration(
          this,
          "sample-slack-notification",
          {
            slackChannelConfigurationName: 'my channel name', 
            slackWorkspaceId: 'stringValue2[0]',
            slackChannelId: 'stringValue[1]',
            notificationTopics: [topic],
          }
        );
      }

输出用于验证。它将整个列表作为一个字符串值输出，而不仅仅是预期的提取的第一个元素。

原文

I am trying to extract existing SSM parameters of stringList in my cdk app.

I can store a single value, but to avoid duplication of code I am trying to store 3 values in single variable and access them as array in the form value[0]

        const stringValue = ssm.StringParameter.fromStringParameterAttributes(this, 'MyValue', 
    
        const stringValue2 = ssm.StringListParameter.fromStringListParameterName(this, 'myValue', '/dev/name')
    
        const ssmstringlistoutput = new cdk.CfnOutput(this, 'ssmoutput', {
          value: cdk.Fn.select(0, stringValue2.stringListValue),
          description: 'name of ssmlist',
          exportName: 'avatarsBucket',
        });
    
    
        // Chatbot Slack Notification Integration
        const bot = new chat.SlackChannelConfiguration(
          this,
          "sample-slack-notification",
          {
            slackChannelConfigurationName: 'my channel name', 
            slackWorkspaceId: 'stringValue2[0]',
            slackChannelId: 'stringValue[1]',
            notificationTopics: [topic],
          }
        );
      }

The output is for verification. It outputs the entire list as one string value, not just the extracted first element as expected.

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糖粟与秋泊 2025-02-20 08:13:12

代替StringListParameter.fromstringListParamEtername，创建 cfnParameter 构造。将参数名称作为默认值传递：

const listParam = new cdk.CfnParameter(this, 'ListParam', {
  type: 'AWS::SSM::Parameter::Value<List<String>>',
  default: '/dev/name',
});

然后在将值传递为Prop输入时选择一个元素：

slackWorkspaceId: cdk.Fn.select(0, listParam.valueAsList),
slackChannelId: cdk.Fn.select(1, listParam.valueAsList),

正在发生什么？ href =“ https://docs.aws.amazon.com/awscloudformation/latest/userguide/dynamic-references.html#dynamic-references-references-references-ssm” {{resolve：ssm：/dev/name}} 。正如您发现的那样，云形式显然不能将拆分应用于动态参考。

Instead of StringListParameter.fromStringListParameterName, create a CfnParameter construct. Pass the parameter name as the default value:

const listParam = new cdk.CfnParameter(this, 'ListParam', {
  type: 'AWS::SSM::Parameter::Value<List<String>>',
  default: '/dev/name',
});

Then select an element when passing the value as prop inputs:

slackWorkspaceId: cdk.Fn.select(0, listParam.valueAsList),
slackChannelId: cdk.Fn.select(1, listParam.valueAsList),

What's going on? fromStringListParameterName synthesises to a CloudFormation dynamic reference like {{resolve:ssm:/dev/name}}. And as you discovered, CloudFormation apparently cannot apply a split to dynamic references.

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