使用terraform设置由预定事件源触发的lambda函数 [英] Use terraform to set up a lambda function triggered by a scheduled event source

问题描述

我想每五分钟运行一次AWS lambda函数.在AWS管理控制台中，这很容易在lambda函数的事件源"选项卡下进行设置，但是如何使用 Terraform ?

I would like to run an AWS lambda function every five minutes. In the AWS Management Console this is easy to set up, under the lambda function's "Event Sources" tab, but how do I set it up with Terraform?

我尝试使用一种aws_lambda_event_source_mapping资源，但事实证明它使用的API 仅支持Kinesis和DynamoDB.当我尝试将其与计划的事件源一起使用时，创建会超时.

I tried to use an aws_lambda_event_source_mapping resource, but it turns out that the API it uses only supports events from Kinesis and DynamoDB. When I try to use it with a scheduled event source, creation times out.

推荐答案

您可以使用aws_cloudwatch_event_target资源将计划的事件源(事件规则)绑定到lambda函数.您需要授予它调用lambda函数的权限.您可以为此使用aws_lambda_permission资源.

You can use an aws_cloudwatch_event_target resource to tie the scheduled event source (event rule) to your lambda function. You need to grant it permission to invoke your lambda function; you can use an aws_lambda_permission resource for this.

示例:

resource "aws_lambda_function" "check_foo" {
    filename = "check_foo.zip"
    function_name = "checkFoo"
    role = "arn:aws:iam::424242:role/something"
    handler = "index.handler"
}

resource "aws_cloudwatch_event_rule" "every_five_minutes" {
    name = "every-five-minutes"
    description = "Fires every five minutes"
    schedule_expression = "rate(5 minutes)"
}

resource "aws_cloudwatch_event_target" "check_foo_every_five_minutes" {
    rule = "${aws_cloudwatch_event_rule.every_five_minutes.name}"
    target_id = "check_foo"
    arn = "${aws_lambda_function.check_foo.arn}"
}

resource "aws_lambda_permission" "allow_cloudwatch_to_call_check_foo" {
    statement_id = "AllowExecutionFromCloudWatch"
    action = "lambda:InvokeFunction"
    function_name = "${aws_lambda_function.check_foo.function_name}"
    principal = "events.amazonaws.com"
    source_arn = "${aws_cloudwatch_event_rule.every_five_minutes.arn}"
}

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