带有 localstack-serverless 插件的无服务器不在本地查询模板答案

【问题标题】：Serverless with localstack-serverless plugin not querying template locally带有 localstack-serverless 插件的无服务器不在本地查询模板
【发布时间】：2019-12-05 18:58:50
【问题描述】：

基于 GitHub 上展示 serverless REST API 的官方示例，我启用了 localstack-serverless 插件，以便我可以在本地开发我的服务。我相应地调整了serverless.yml 文件：

service: serverless-rest-api-with-dynamodb

frameworkVersion: ">=1.1.0 <2.0.0"

provider:
  name: aws
  runtime: python2.7
  deploymentBucket:
    name: ${self:service}-${opt:stage}-deployment-bucket
  environment:
    DYNAMODB_TABLE: ${self:service}-${opt:stage, self:provider.stage}
  iamRoleStatements:
    - Effect: Allow
      Action:
        - dynamodb:Query
        - dynamodb:Scan
        - dynamodb:GetItem
        - dynamodb:PutItem
        - dynamodb:UpdateItem
        - dynamodb:DeleteItem
      Resource: "arn:aws:dynamodb:${opt:region, self:provider.region}:*:table/${self:provider.environment.DYNAMODB_TABLE}"

custom:
  localstack:
    stages:
    - local
    - dev
    endpoints:
      S3: http://localhost:4572
      DynamoDB: http://localhost:4570
      CloudFormation: http://localhost:4581
      Elasticsearch: http://localhost:4571
      ES: http://localhost:4578
      SNS: http://localhost:4575
      SQS: http://localhost:4576
      Lambda: http://localhost:4574
      Kinesis: http://localhost:4568

plugins:
  - serverless-localstack

functions:
  create:
    handler: todos/create.create
    events:
      - http:
          path: todos
          method: post
          cors: true

  list:
    handler: todos/list.list
    events:
      - http:
          path: todos
          method: get
          cors: true

  get:
    handler: todos/get.get
    events:
      - http:
          path: todos/{id}
          method: get
          cors: true

  update:
    handler: todos/update.update
    events:
      - http:
          path: todos/{id}
          method: put
          cors: true

  delete:
    handler: todos/delete.delete
    events:
      - http:
          path: todos/{id}
          method: delete
          cors: true

resources:
  Resources:
    TodosDynamoDbTable:
      Type: 'AWS::DynamoDB::Table'
      DeletionPolicy: Retain
      Properties:
        AttributeDefinitions:
          -
            AttributeName: id
            AttributeType: S
        KeySchema:
          -
            AttributeName: id
            KeyType: HASH
        ProvisionedThroughput:
          ReadCapacityUnits: 1
          WriteCapacityUnits: 1
        TableName: ${self:provider.environment.DYNAMODB_TABLE}

部署在通过 docker 运行的 localstack 上：

SLS_DEBUG=3 serverless deploy --stage local --region us-east-1

它在 localstack 端失败并显示以下消息：

localstack_1  | 2019-12-04 10:41:33,692:API: 127.0.0.1 - - [04/Dec/2019 10:41:33] "PUT /serverless-rest-api-with-dynamodb-local-deployment-bucket HTTP/1.1" 200 -
localstack_1  | 2019-12-04 10:41:41,402:API: 127.0.0.1 - - [04/Dec/2019 10:41:41] "GET /serverless-rest-api-with-dynamodb-local-deployment-bucket?location HTTP/1.1" 200 -
localstack_1  | 2019-12-04 10:41:41,470:API: 127.0.0.1 - - [04/Dec/2019 10:41:41] "GET /serverless-rest-api-with-dynamodb-local-deployment-bucket?list-type=2&prefix=serverless%2Fserverless-rest-api-with-dynamodb%2Flocal HTTP/1.1" 200 -
localstack_1  | 2019-12-04 10:41:41,544:API: 127.0.0.1 - - [04/Dec/2019 10:41:41] "PUT /serverless-rest-api-with-dynamodb-local-deployment-bucket/serverless/serverless-rest-api-with-dynamodb/local/1575456101319-2019-12-04T10%3A41%3A41.319Z/compiled-cloudformation-template.json HTTP/1.1" 200 -
localstack_1  | 2019-12-04 10:41:41,569:API: 127.0.0.1 - - [04/Dec/2019 10:41:41] "PUT /serverless-rest-api-with-dynamodb-local-deployment-bucket/serverless/serverless-rest-api-with-dynamodb/local/1575456101319-2019-12-04T10%3A41%3A41.319Z/serverless-rest-api-with-dynamodb.zip HTTP/1.1" 200 -
localstack_1  | 2019-12-04T10:41:41:DEBUG:localstack.services.cloudformation.cloudformation_listener: Error response from CloudFormation (400) POST /: b'<ErrorResponse xmlns="http://cloudformation.amazonaws.com/doc/2010-05-15/">\n  <Error>\n    <Type>Sender</Type>\n    <Code>ValidationError</Code>\n    <Message>Stack with id serverless-rest-api-with-dynamodb-local does not exist</Message>\n  </Error>\n  <RequestId>cf4c737e-5ae2-11e4-a7c9-ad44eEXAMPLE</RequestId>\n</ErrorResponse>'
localstack_1  | 2019-12-04T10:41:41:WARNING:localstack.services.awslambda.lambda_api: Function not found: arn:aws:lambda:us-east-1:000000000000:function:serverless-rest-api-with-dynamodb-local-list
localstack_1  | 2019-12-04T10:41:41:WARNING:localstack.services.awslambda.lambda_api: Function not found: arn:aws:lambda:us-east-1:000000000000:function:serverless-rest-api-with-dynamodb-local-create
localstack_1  | 2019-12-04T10:41:41:WARNING:localstack.services.awslambda.lambda_api: Function not found: arn:aws:lambda:us-east-1:000000000000:function:serverless-rest-api-with-dynamodb-local-update
localstack_1  | 2019-12-04T10:41:41:WARNING:localstack.services.awslambda.lambda_api: Function not found: arn:aws:lambda:us-east-1:000000000000:function:serverless-rest-api-with-dynamodb-local-get
localstack_1  | 2019-12-04T10:41:41:WARNING:localstack.services.awslambda.lambda_api: Function not found: arn:aws:lambda:us-east-1:000000000000:function:serverless-rest-api-with-dynamodb-local-delete
localstack_1  | 2019-12-04T10:41:42:ERROR:localstack.services.generic_proxy: Error forwarding request: Unable to fetch template body (code 404) from URL https://s3.amazonaws.com/serverless-rest-api-with-dynamodb-local-deployment-bucket/serverless/serverless-rest-api-with-dynamodb/local/1575456101319-2019-12-04T10:41:41.319Z/compiled-cloudformation-template.json Traceback (most recent call last):
localstack_1  |   File "/opt/code/localstack/localstack/services/generic_proxy.py", line 240, in forward
localstack_1  |     path=path, data=data, headers=forward_headers)
localstack_1  |   File "/opt/code/localstack/localstack/services/cloudformation/cloudformation_listener.py", line 151, in forward_request
localstack_1  |     modified_request = transform_template(req_data)
localstack_1  |   File "/opt/code/localstack/localstack/services/cloudformation/cloudformation_listener.py", line 70, in transform_template
localstack_1  |     template_body = get_template_body(req_data)
localstack_1  |   File "/opt/code/localstack/localstack/services/cloudformation/cloudformation_listener.py", line 105, in get_template_body
localstack_1  |     raise Exception('Unable to fetch template body (code %s) from URL %s' % (response.status_code, url[0]))
localstack_1  | Exception: Unable to fetch template body (code 404) from URL https://s3.amazonaws.com/serverless-rest-api-with-dynamodb-local-deployment-bucket/serverless/serverless-rest-api-with-dynamodb/local/1575456101319-2019-12-04T10:41:41.319Z/compiled-cloudformation-template.json

我们可以看到无服务器部署正在尝试直接访问 Amazon S3，而我希望它使用在 serverless.yml 配置 (http://localhost:4572) 中定义的本地端点。

serverless.yml 配置文件中是否缺少条目以强制使用 localstack S3 存储？

【问题讨论】：

嗯这很奇怪，尝试取出区域？
哦，还要检查自述文件并搜索 MountCode 看起来 localstack 会将 lambda 部署到 s3 然后在没有 MountCode 的情况下下载它：true
无服务器抱怨如果我取出该区域则找不到 S3 存储桶...至于 mountCode 自定义属性：似乎没有发挥作用，因为我是否将其设置为相同的错误不管真假。
嗯...有趣...让我抓住它，我会去的。我主要使用 sls 离线和 docker 中的本地 DDB。
找到了...与无服务器无关，但与我正在使用的 localstack docker 映像有关。 localstack/localstack:0.10.4 正在工作。

标签： aws-lambda serverless localstack

【解决方案1】：

我使用的本地堆栈图像存在回归。使用docker镜像localstack/localstack:0.10.5部署成功。

在配置文件和代码中明确设置区域也有帮助。

【讨论】：