如何使用Terraform成功部署API网关，Lambda和Dynamo DB？

问题描述

我想使用 Terraform 部署 API网关， Lambda 和 DynamoDB ，以便我可以执行基本在DynamoDB表上进行读取和写入操作。为此，我创建了一个 funcLambda.js 文件，该文件具有以下代码-

var AWS = require('aws-sdk');
var dynamo = new AWS.DynamoDB.DocumentClient();

exports.handler = function(event,context,callback) {

    var operation = event.operation;

    if (event.tableName) {
        event.payload.TableName = event.tableName;
    }

    switch (operation) {
        case 'create':
            dynamo.put(event.payload,callback);
            break;
        case 'read':
            dynamo.get(event.payload,callback);
            break;
        default:
            callback(`Unknown operation: ${operation}`);
    }
};

我已将此代码上传到名为 mybuck7086125 的S3存储桶中的名为 funcLambda.zip 的zip文件中。 然后，我编写了下面的terraform代码-

provider "aws" {
   region = "us-east-1"
}

resource "aws_dynamodb_table" "ddbtable" {
  name             = "myDB"
  hash_key         = "id"
  billing_mode   = "PROVISIONED"
  read_capacity  = 5
  write_capacity = 5
  attribute {
    name = "id"
    type = "S"
  }
}

resource "aws_iam_role_policy" "lambda_policy" {
  name = "lambda_policy"
  role = aws_iam_role.role_for_LDC.id

  policy = <<-EOF
  {  
   "Version": "2012-10-17","Statement":[{
     "Effect": "Allow","Action": [
      "dynamodb:BatchGetItem","dynamodb:GetItem","dynamodb:Query","dynamodb:Scan","dynamodb:BatchWriteItem","dynamodb:PutItem","dynamodb:UpdateItem"
     ],"Resource": "arn:aws:dynamodb:us-east-1:987456321456:table/myDB"
    }
   ]
  }
  EOF
}

resource "aws_iam_role" "role_for_LDC" {
  name = "myrole"

  assume_role_policy = <<-EOF
  {
    "Version": "2012-10-17","Statement": [
      {
        "Action": "sts:AssumeRole","Principal": {
          "Service": "lambda.amazonaws.com"
        },"Effect": "Allow","Sid": ""
      }
    ]
  }
  EOF
}


resource "aws_lambda_function" "myLambda" {

  function_name = "func"
  s3_bucket     = "mybuck7086125"
  s3_key        = "funcLambda.zip"
  role          = aws_iam_role.role_for_LDC.arn
  handler       = "funcLambda.handler"
  runtime       = "nodejs12.x"
}


resource "aws_api_gateway_rest_api" "apiLambda" {
  name        = "myAPI"

}


  resource "aws_api_gateway_resource" "Resource" {
  rest_api_id = aws_api_gateway_rest_api.apiLambda.id
  parent_id   = aws_api_gateway_rest_api.apiLambda.root_resource_id
  path_part   = "myresource"

}


resource "aws_api_gateway_method" "Method" {
   rest_api_id   = aws_api_gateway_rest_api.apiLambda.id
   resource_id   = aws_api_gateway_resource.Resource.id
   http_method   = "POST"
   authorization = "NONE"
}


resource "aws_api_gateway_integration" "lambdaInt" {
   rest_api_id = aws_api_gateway_rest_api.apiLambda.id
   resource_id = aws_api_gateway_resource.Resource.id
   http_method = aws_api_gateway_method.Method.http_method

   integration_http_method = "POST"
   type                    = "AWS"
   uri                     = aws_lambda_function.myLambda.invoke_arn

}


resource "aws_api_gateway_deployment" "apideploy" {
   depends_on = [aws_api_gateway_integration.lambdaInt]

   rest_api_id = aws_api_gateway_rest_api.apiLambda.id
   stage_name  = "test"
}


resource "aws_lambda_permission" "apigw" {
   statement_id  = "AllowAPIGatewayInvoke"
   action        = "lambda:InvokeFunction"
   function_name = aws_lambda_function.myLambda.function_name
   principal     = "apigateway.amazonaws.com"

   source_arn    = "${aws_api_gateway_rest_api.apiLambda.execution_arn}/POST/myresource"

}


output "base_url" {
  value = aws_api_gateway_deployment.apideploy.invoke_url
}

使用上述代码，所有AWS三个服务和角色均已成功部署。然后，我转到Lambda控制台并创建了一个测试模板，以检查Lambda是否可以在DynamoDB表上执行操作。我的测试模板如下-

{
  "operation":"create","tableName":"myDB","payload":{
      "Item":{ 
          "id":"1","name":"Maverick","movie":"Top Gun"
       }
   }
}

当我运行测试事件时，它成功并且将数据输入到表中。

最后，当我尝试使用CURL对URL进行相同的操作时，收到internal server error作为消息。下面给出了我的CURL命令及其输出：

souvik@DESKTOP-A673L12 MINGW64 /C/Users/souvik/Desktop/terrlamapidb
$ curl -X POST -d '{"operation":"create","payload":{"Item":{ "id":"1","movie":"Top Gun" }}}' https://t56gdtdyu6.execute-api.us-east-1.amazonaws.com/test/myresource
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   147  100    36  100   111     23     71  0:00:01  0:00:01 --:--:--    94{"message": "Internal server error"}

请告诉我如何解决此问题。

解决方法

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