InvalidParameterValueException：无法访问流

Posted 2023-03-24

【中文标题】InvalidParameterValueException：无法访问流

【英文标题】：InvalidParameterValueException: Cannot access stream

【发布时间】：2021-12-29 03:44:05

【问题描述】：

我正在尝试使用 Terraform 创建一个 dynamodb 表和 lambda 触发器。这就是我定义表、角色策略和 lambda 触发器的方式：

resource "aws_dynamodb_table" "filenames" 
  name           = local.dynamodb_table_filenames
  billing_mode   = "PROVISIONED"
  read_capacity  = 1000
  write_capacity = 1000
  hash_key       = "filename"
  stream_enabled = true
  stream_view_type = "NEW_IMAGE"

  #range_key      = ""

  attribute 
    name = "filename"
    type = "S"
  

  tags = var.tags


resource "aws_iam_role_policy" "dynamodb_policy" 
  policy = jsonencode(
  
    Version: "2012-10-17",
    Statement: [
      
        Action: [
          "dynamodb:GetItem",
          "dynamodb:PutItem",
          "dynamodb:UpdateItem",
          "dynamodb:Query",
          "dynamodb:GetRecords",
          "dynamodb:GetShardIterator",
          "dynamodb:DescribeStream",
          "dynamodb:ListShards",
          "dynamodb:ListStreams",
        ],
        Effect: "Allow",
        Resource: aws_dynamodb_table.filenames.arn
      
    ]
  
  )
  role = aws_iam_role.processing_lambda_role.id


resource "aws_lambda_event_source_mapping" "allow_dynamodb_table_to_trigger_lambda" 
  event_source_arn  = aws_dynamodb_table.filenames.stream_arn
  function_name     = aws_lambda_function.trigger_stepfunction_lambda.arn
  starting_position = "LATEST"

即使我已经添加了角色中添加的相关策略，我仍然收到此错误：

error creating Lambda Event Source Mapping (arn:aws:dynamodb:eu-central-12:table/tablename/stream): InvalidParameterValueException: Cannot access stream arn:aws:dynamodb:eu-central-1:299093934558:table/4tablename/stream. Please ensure the role can perform the GetRecords, GetShardIterator, DescribeStream, ListShards, and ListStreams Actions on your stream in IAM.

我该如何解决这个问题？

【参考方案1】：

流操作适用于流，而不是表。流的 ARN 的 form 为：

arn:$Partition:dynamodb:$Region:$Account:table/$TableName/stream/$StreamLabel

因此，您应该使用（或等效的东西）：

Resource: "$aws_dynamodb_table.filenames.arn/stream/*"

或更笼统地说：

Resource: "$aws_dynamodb_table.filenames.arn/*"