无法在 Step Function API 网关调用的查询参数上从上下文添加变量

Question

我正在尝试从 Step Function 进行两次连续的 API 网关调用，使用第一个结果中的值对第二个结果进行调用。我已经在 POST 调用中尝试过并且它有效，但现在我无法在 GET 调用中执行此操作。这是我的步骤函数：

{
  "Comment": "A Hello World example of the Amazon States Language using Pass states",
  "StartAt": "Api Call",
  "States": {
    "Api Call": {
      "Type": "Task",
      "Resource": "arn:aws:states:::apigateway:invoke",
      "Parameters": {
        "ApiEndpoint": "***************.us-east-1.amazonaws.com",
        "Method": "GET",
        "Path": "universities",
        "RequestBody": {},
        "AuthType": "NO_AUTH"
      },
      "ResultSelector": {
        "logWord.$": "$.StatusText"
      },
      "Next": "Api Call 2"
    },
    "Api Call 2": {
      "Type": "Task",
      "Resource": "arn:aws:states:::apigateway:invoke",
      "Parameters": {
        "ApiEndpoint": "***************.us-east-1.amazonaws.com",
        "Method": "GET",
        "Path": "logging",
        "Headers": { 
            "Content-Type": ["application/json"] 
        },
        "QueryParameters": {
          "logWord.$": "$.logWord"
        },
        "AuthType": "NO_AUTH"
      },
      "End": true
    }
  }
}

我得到的错误如下：

{
  "error": "States.Runtime",
  "cause": "An error occurred while executing the state 'Api Call 2' (entered at the event id #7). The Parameters '{\"ApiEndpoint\":\"***************.us-east-1.amazonaws.com\",\"Method\":\"GET\",\"Path\":\"logging\",\"Headers\":{\"Content-Type\":[\"application/json\"]},\"QueryParameters\":{\"logWord\":\"OK\"},\"AuthType\":\"NO_AUTH\"}' could not be used to start the Task: [The value of the field 'QueryParameters' has an invalid format]"
}

根据 documentation，查询参数应该放在方括号之间，但是如果我使用的是上下文变量，我就不能放在方括号中。控制台甚至不允许我保存 (The value for the field 'logWord.$' must be a STRING that contains a JSONPath but was an ARRAY)。

如果有人知道如何使用上下文变量进行 GET 调用，我们将不胜感激。

Answer 1

看起来 QueryParameters 想要一个字符串列表。使用 States.Array intrinsic function 将内插的 string 转换为 [string] 列表。

"QueryParameters": {
    "logWord.$": "States.Array($.logWord)" // ["OK"]
  },

无法在 Step Function API 网关调用的查询参数上从上下文添加变量

Cannot add variable from context on QueryParameters on Step Function API Gateway call

amazon-web-services

aws-api-gateway

aws-step-functions