Terraform :由等号("=")引入的属性值。

Question

我正在开发一个terraform脚本，它使用HTTPS/POST请求将API集成到DynamoDB。基本目标是插入DynamoDB表中API请求正文中传递的记录。我使用attributes(BusinessUnitId定义集成，并在那里传递请求模板，其中应该包括两个aws_api_gateway_integration和Frequency).My脚本，如下所示-

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')"
            }
        }
    }
  }
}

我找不到一个正确的语法来指示项应该如何在request_templates中传递。在部署过程中它会抛出错误-

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 ("=").

有人能帮我确认一下这个问题吗？

Answer 1

看起来您正在尝试使用HCL 模板表达式，但是您忘记了两件关键的事情：

1. 模板表达式以<< MARKER开头，您选择了EOF作为标记，但忘记了<<
2. 你忘了“线上”的记号。

固定版本：

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
  }
}

Answer 2

尽管现有的其他答案对于如何使用多行模板表达式是正确的，但通常最好使用jsonencode函数来生成JSON字符串，而不是使用字符串模板，因为结果始终是有效的JSON，而不需要考虑引用、转义和逗号的正确位置。

例如：

  request_templates = {
    "application/json" = jsonencode({
      "TableName" = "${var.environment_id}-AccountService-NotesToDatalakeSchedule"
      "Item" = {
        "BusinessUnitId" = {
          "N" = "$input.path('$.BusinessUnitId')"
        }
        "Frequency" = {
          "N" = "$input.path('$.Frequency')"
        }
      }
    })
  }

这里给jsonencode的参数是一个Terraform表达式，它构造了一个对象值。文档描述了函数如何将Terraform值转换为相应的JSON数据类型，在该表中，上面的示例应该生成与您在问题中试图编写的模板等效的JSON数据结构。