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是什么导致我的 SAM 模板产生那么多错误

分类：编程问答

如何解决是什么导致我的 SAM 模板产生那么多错误

我一直在努力让我的 SAM 模板正常工作。我有一个 SAM 模板的一般想法，但我不明白我不断从 CloudFormation 得到的错误背后的逻辑 我的输出正确吗？我只使用 API 的（不是函数？）。我可以执行 GET 请求，但 CORS 阻止我执行 PUT 和 POST 请求。 什么是多余的，我缺少什么？

错误：“状态原因 模板输出块中未解析的资源依赖[ServerlessRestApi]”

我也经常收到以下错误：“REST API 不包含任何方法（服务：AmazonApiGateway；状态代码：400；错误代码：BadRequestException；请求 ID：abad588e -02ee-4fc6-a668-43b30bec6aaf；代理：null)"

Template.yaml：

AWstemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  SAM Template

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 10

Resources:
  ApiGatewayApi:
    Type: AWS::Serverless::Api
    Properties:
      Name: ApiGatewayApi
      StageName: Prod
      Cors:
        AllowMethods: "'OPTIONS,POST,GET,PUT,PATCH,DELETE'"
        AllowHeaders: "'Content-Type'"
        AllowOrigin: "'*'"
  DeclinesituationFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      FunctionName: Declinesituation
      CodeUri: decline-situation/
      Handler: app.lambda_handler
      Runtime: python3.8
      Events:
        DeclinesituationAPI:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /decline-situation
            Method: put
            RestApiId: !Ref ApiGatewayApi
  AcceptSituationFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      FunctionName: AcceptSituation
      CodeUri: accept-situation/
      Handler: app.lambda_handler
      Runtime: python3.8
      Events:
        AcceptSituationAPI:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /accept-situation
            Method: post
            RestApiId: !Ref ApiGatewayApi
  GetIncidentsFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      FunctionName: GetIncidents
      CodeUri: get-incidents/
      Handler: app.lambda_handler
      Runtime: python3.8
      Events:
        GetIncidentsAPI:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /incidents
            Method: get
            RestApiId: !Ref ApiGatewayApi
  GetSituationsFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      FunctionName: GetSituations
      CodeUri: get-situations/
      Handler: app.lambda_handler
      Runtime: python3.8
      Policies: AWSLambdaDynamoDBExecutionRole
      Events:
        GetSituationsAPI:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /situations
            Method: get
            RestApiId: !Ref ApiGatewayApi
  GetRecoveriesFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      FunctionName: GetRecoveries
      CodeUri: get-recoveries/
      Handler: app.lambda_handler
      Runtime: python3.8
      Policies: AWSLambdaDynamoDBExecutionRole
      Events:
        GetRecoveriesAPI:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /recoveries
            Method: get
            RestApiId: !Ref ApiGatewayApi
  ReadNotificationFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: ReadNotification
      CodeUri: read-notification/
      Handler: app.lambda_handler
      Runtime: python3.8
      Policies:
        - DynamoDBCrudPolicy:
            TableName: Situations
  Incidents:
    Type: AWS::DynamoDB::Table
    Properties:
      TableName: aimAS-Incidents
      AttributeDeFinitions:
        - AttributeName: incidentId
          AttributeType: S
        - AttributeName: situationId
          AttributeType: S
      KeySchema:
        - AttributeName: incidentId
          KeyType: HASH
      ProvisionedThroughput:
        ReadCapacityUnits: 5
        WriteCapacityUnits: 5
  Situations:
    Type: AWS::DynamoDB::Table
    Properties:
      TableName: aimAS-Situations
      AttributeDeFinitions:
        - AttributeName: situationId
          AttributeType: S
      KeySchema:
        - AttributeName: situationId
          KeyType: HASH
      ProvisionedThroughput:
        ReadCapacityUnits: 5
        WriteCapacityUnits: 5
  Recoveries:
    Type: AWS::DynamoDB::Table
    Properties:
      TableName: aimAS-Recoveries
      AttributeDeFinitions:
        - AttributeName: recoveryId
          AttributeType: S
        - AttributeName: situationId
          AttributeType: S
        - AttributeName: incidentId
          AttributeType: S
      KeySchema:
        - AttributeName: recoveryId
          KeyType: HASH
      ProvisionedThroughput:
        ReadCapacityUnits: 5
        WriteCapacityUnits: 5
Outputs:
  # ServerlessRestApi is an implicit API created out of Events key under Serverless::Function
  # Find out more about other implicit resources you can reference within SAM
  # https://github.com/awslabs/serverless-application-model/blob/master/docs/internals/generated_resources.rst#api
  #Incidents
  GetIncidentsAPI:
    Description: "API Gateway endpoint URL for Prod stage for GetIncidentsAPI"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/incidents/"
  GetIncidentsFunction:
    Description: "GetIncidents Lambda Function ARN"
    Value: !GetAtt GetIncidentsFunction.Arn
  #Recoveries
  GetRecoveriesAPI:
    Description: "API Gateway endpoint URL for Prod stage for GetRecoveriesAPI"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/recoveries/"
  GetRecoveriesFunction:
    Description: "GetRecoveries Lambda Function ARN"
    Value: !GetAtt GetRecoveriesFunction.Arn
  #Situations
  AcceptSituationFunction:
    Description: "AcceptSituationFunction Lambda Function ARN"
    Value: !GetAtt AcceptSituationFunction.Arn
  AcceptSituationAPI:
    Description: "API Gateway endpoint URL for GetSituationsAPI"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/accept-situation/"
  DeclinesituationFunction:
    Description: "DeclinesituationFunction Lambda Function ARN"
    Value: !GetAtt DeclinesituationFunction.Arn
  DeclinesituationAPI:
    Description: "API Gateway endpoint URL for GetSituationsAPI"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/decline-situation/"
  GetSituationsAPI:
    Description: "API Gateway endpoint URL for GetSituationsAPI"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/situations/"
  GetSituationsFunction:
    Description: "GetSituations Lambda Function ARN"
    Value: !GetAtt GetSituationsFunction.Arn
  #Read Notifications
  ReadNotificationFunction:
    Description: "ReadNotification Lambda Function ARN"
    Value: !GetAtt ReadNotificationFunction.Arn

解决方法

您的模板中有多个错误。

    E3039 The set of Attributes in AttributeDefinitions: ['incidentId','situationId'] and KeySchemas: ['incidentId'] must match at Resources/Incidents/Properties

    E3039 The set of Attributes in AttributeDefinitions: ['incidentId','recoveryId','situationId'] and KeySchemas: ['recoveryId'] must match at Resources/Recoveries/Properties

    E1019 Parameter ServerlessRestApi for Fn::Sub not found at Outputs/GetIncidentsAPI/Value/Fn::Sub
    x.yml:156:5

    E1019 Parameter ServerlessRestApi for Fn::Sub not found at Outputs/GetRecoveriesAPI/Value/Fn::Sub
    x.yml:163:5

    E1019 Parameter ServerlessRestApi for Fn::Sub not found at Outputs/AcceptSituationAPI/Value/Fn::Sub
    x.yml:173:5

    E1019 Parameter ServerlessRestApi for Fn::Sub not found at Outputs/DeclineSituationAPI/Value/Fn::Sub
    x.yml:179:5

    E1019 Parameter ServerlessRestApi for Fn::Sub not found at Outputs/GetSituationsAPI/Value/Fn::Sub
    x.yml:182:5

使用 cfn-linter 和 documentation 生成模板，文档中也有很多很好的例子。

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