配置 CloudWatch Events 以使用 Terraform 将输入发送到 Lambda 函数

Question

我想配置 CloudWatch Events 以使用 Terraform 将输入发送到 Lambda 函数。我使用以下脚本来执行此操作：

resource "aws_cloudwatch_event_rule" "aa-rule-event" {
  count               = "${var.count}"
  name                = "${var.application_name}-${element(var.names, count.index)}"
  description         = "${element(var.descriptions, count.index)}"
  schedule_expression = "${element(var.cron-expressions, count.index)}"
  is_enabled          = "${element(var.rule-status-states, count.index)}"
}

resource "aws_cloudwatch_event_target" "aa-rule-target" {
  count     = "${var.count}"
  rule      = "${var.application_name}-${element(var.names, count.index)}"
  target_id = "CloudWatchToLambda"
  arn       = "arn:aws:lambda:${var.aws_region}:${var.aws_account_number}:function:${var.application_name}-${element(var.target-lambda-function, count.index)}"
}

我需要通过此 CloudWatch Event 向目标 Lambda 提供输入。我知道可以配置输入，但是如何在 Terraform 中配置它？

Answer 1

该aws_cloudwatch_event_target资源采用一个可选input参数，该参数可以将 JSON blob 传递到相当于调用 Lambda 函数时有效负载的目标。

resource "aws_cloudwatch_event_rule" "aa-rule-event" {
  count               = "${var.count}"
  name                = "${var.application_name}-${element(var.names, count.index)}"
  description         = "${element(var.descriptions, count.index)}"
  schedule_expression = "${element(var.cron-expressions, count.index)}"
  is_enabled          = "${element(var.rule-status-states, count.index)}"
}

resource "aws_cloudwatch_event_target" "aa-rule-target" {
  count     = "${var.count}"
  rule      = "${var.application_name}-${element(var.names, count.index)}"
  target_id = "CloudWatchToLambda"
  arn       = "arn:aws:lambda:${var.aws_region}:${var.aws_account_number}:function:${var.application_name}-${element(var.target-lambda-function, count.index)}"
  input = <<JSON
{
  "foo": {
    "bar": [
      1,
      2
    ]
  }
}
JSON
}