I'm working on a terraform script which integrates API Gateway to DynamoDB using HTTPS/POST request. The basic objective is to insert the records that are passed in the API request body in the DynamoDB table. I'm using aws_api_gateway_integration to define the integration and there I'm passing the request template which should include two attributes(BusinessUnitId and Frequency).My script looks like this -

resource aws_api_gateway_integration schedule_post_integration {
  rest_api_id             = aws_api_gateway_rest_api.schedule.id
  resource_id             = aws_api_gateway_resource.schedule_resource.id
  http_method             = aws_api_gateway_method.schedule_post_method.http_method
  type                    = "AWS"
  integration_http_method = "POST"
  uri                     = "arn:aws:apigateway:${var.target_region}:dynamodb:action/PutItem"
  credentials             = aws_iam_role.schedule_api_dynamodb_role.arn
  request_templates       = {
    "application/json" = EOF
    {
        "TableName" : "${var.environment_id}-AccountService-NotesToDatalakeSchedule",
        "Item" : {
            "BusinessUnitId" : {
                "N" : "$input.path('$.BusinessUnitId')"
            },
            "Frequency" : {
                "N" : "$input.path('$.Frequency')"
            }
        }
    }
  }
}

I couldn't find a proper syntax indicating how the Item should be passed in the request_templates. During deployment it throws the error -

2022-09-12T11:51:22.6623262Z ##[error][1m[31mError: [0m[0m[1mMissing attribute value[0m
2022-09-12T11:51:22.6626316Z ##[error][0m  on api-gateway.tf line 47, in resource "aws_api_gateway_integration" "schedule_post_integration":
2022-09-12T11:51:22.6628770Z ##[error]  35:   request_templates       = {
2022-09-12T11:51:22.6630845Z ##[error]  36:     "application/json" = EOF
2022-09-12T11:51:22.6632935Z ##[error]  37:     {
2022-09-12T11:51:22.6636136Z ##[error]  38:         "TableName" : "${var.environment_id}-AccountService-NotesToDatalakeSchedule",
2022-09-12T11:51:22.6638305Z ##[error]  39:         "Item" : {
2022-09-12T11:51:22.6642274Z ##[error]  40:             "BusinessUnitId" : {
2022-09-12T11:51:22.6645424Z ##[error]  41:                 "N" : "$input.path('$.BusinessUnitId')"
2022-09-12T11:51:22.6647529Z ##[error]  42:             },
2022-09-12T11:51:22.6649461Z ##[error]  43:             "Frequency" : {
2022-09-12T11:51:22.6651639Z ##[error]  44:                 "N" : "$input.path('$.Frequency')"
2022-09-12T11:51:22.6653642Z ##[error]  45:             }
2022-09-12T11:51:22.6655505Z ##[error]  46:         }
2022-09-12T11:51:22.6657282Z ##[error]  47:     }
2022-09-12T11:51:22.6659045Z ##[error]  48:   }
2022-09-12T11:51:22.6661277Z ##[error]Expected an attribute value, introduced by an equals sign ("=").

Can someone help me identifying the issue here?

CodePudding user response：

It looks like you are trying to use HCL Template Expressions, but you forgot two key things:

1. A template expression starts with << MARKER, you chose EOF as marker but forgot the <<
2. You forgot the marker "on a line by itself".

Fixed version:

resource aws_api_gateway_integration schedule_post_integration {
  rest_api_id             = aws_api_gateway_rest_api.schedule.id
  resource_id             = aws_api_gateway_resource.schedule_resource.id
  http_method             = aws_api_gateway_method.schedule_post_method.http_method
  type                    = "AWS"
  integration_http_method = "POST"
  uri                     = "arn:aws:apigateway:${var.target_region}:dynamodb:action/PutItem"
  credentials             = aws_iam_role.schedule_api_dynamodb_role.arn
  request_templates       = {
    "application/json" = << EOF
    {
        "TableName" : "${var.environment_id}-AccountService-NotesToDatalakeSchedule",
        "Item" : {
            "BusinessUnitId" : {
                "N" : "$input.path('$.BusinessUnitId')"
            },
            "Frequency" : {
                "N" : "$input.path('$.Frequency')"
            }
        }
    }
EOF
  }
}