Amazon web services 阶跃函数中的循环

我试图在循环中调用我的step函数中的几个步骤，但我无法理解我需要如何做。到目前为止，我所拥有的是：我需要添加另一个lambda函数（GetReviews），它将在循环中调用CreateReview、SendNotification。我该怎么做呢？ 我指的是“”文件，它表明这是可能的

步进函数定义：

{
  "Comment": "Scheduling Engine",
  "StartAt": "CreateReview",
  "States": {
    "CreateReview": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:us-west-2:529627678433:function:CreateReview",
      "Next": "CreateNotification",
      "InputPath": "$",
      "ResultPath": "$.CreateReviewResult",
      "OutputPath": "$"      
    },
    "CreateNotification": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:us-west-2:529627678433:function:CreateNotification",
      "InputPath": "$",
      "ResultPath": "$.CreateNotificationResult",
      "OutputPath": "$",
      "End": true
    }
  }
}

---

很抱歉回复太晚。你可能已经解决了这两者之间的问题，但你来了

因此，在步骤函数中循环时，我只需添加一个选择状态（请参阅）

其中一个状态需要输出是否已完成循环，或者迭代的项目数和项目总数

在第一种情况下，可能是这样的

{
  "Comment": "Scheduling Engine",
  "StartAt": "CreateReview",
  "States": {
    "GetReviews": {
       whatever
       "Next": "LoopChoiceState"
    },
    "LoopChoiceState": {
      "Type" : "Choice",
      "Choices": [
       {
          "Variable": "$.loopCompleted",
          "BooleanEquals": false,
          "Next": "GetReviews"
        }
      ],
      "Default": "YourEndState"
    },
    "CreateReview": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:us-westz2:529627678433:function:CreateReview",
      "Next": "CreateNotification",
      "InputPath": "$",
      "ResultPath": "$.CreateReviewResult",
      "OutputPath": "$"      
    },
    "CreateNotification": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:us-west-2:529627678433:function:CreateNotification",
      "InputPath": "$",
      "ResultPath": "$.CreateNotificationResult",
      "OutputPath": "$",
      "End": true
    }
  }
}

第二种情况：

{
  "Comment": "Scheduling Engine",
  "StartAt": "CreateReview",
  "States": {
    "GetReviews": {
       whatever
       "Next": "LoopChoiceState"
    },
    "LoopChoiceState": {
       "Type" : "Choice",
       "Choices": [
         {
           "Variable": "$.iteratedItemsCount",
           "NumericEquals": "$.totalItemsCount",
           "Next": "CreateNotification"
         }
     ],
     "Default": "CreateReview"
    },
    "CreateReview": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:us-west-2:529627678433:function:CreateReview",
      "Next": "CreateNotification",
      "InputPath": "$",
      "ResultPath": "$.CreateReviewResult",
      "OutputPath": "$"      
    },
    "CreateNotification": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:us-west-2:529627678433:function:CreateNotification",
      "InputPath": "$",
      "ResultPath": "$.CreateNotificationResult",
      "OutputPath": "$",
      "End": true
    }
  }
}

---

您还可以使用索引（当前索引和最后一个索引），而不是迭代的项数；它将帮助您跟踪您在何处创建评论。

只是澄清一下，我们的目标是循环从getReviews检索到的评论，对吗？类似于

let reviews=getReviews（）；对于（评论中的评论）{createReview（评论）；sendNotification}

@ElFitz，是的，这是真的。我想在阶跃函数中循环。