从 API Gateway 获取 terraform 中 AWS lambda 的端点

Question

I have a lambda deployed to AWS, integration is lambda-proxy , now I have an API Gateway which gives me an endpoint for calling the lambda. I need to get this endpoint URL in a terraform configuration, how can I do this?

Data sources don't expose any URL

data "aws_lambda_function" "myfunction" {
  function_name = "my-function-name"
}

data "aws_api_gateway_rest_api" "my_rest_api" {
  name = "my-rest-api"
}

api_gateway_deployment does expose an invoke_url , but infortunately it can't be imported, otherwise I could have declared the resources and then use terraform import ...

resource "aws_api_gateway_rest_api" "my_rest_api" {
  name        = "my-rest-api"
  tags = {
    STAGE = "prod"
  }
}

resource "aws_api_gateway_deployment" "my_rest_api" {
  rest_api_id = aws_api_gateway_rest_api.my_rest_api.id
  stage_name  = "prod"
}

EDIT: to clarify, the lambda is not deployed or managed by terraform.

Answer 1

I have a slightly different but similar setup working on my end.

I used:
- Terraform to provision AWS API Gateway Custom Domain
- Serverless Framework to deploy & link Lambdas to the API GW URL created above.

I exported API GW URL from Terraform as an Output Variable. And, passed it as an environment variable to Serverless Framework during function deployment.

Here it is how in action.

1/ main.tf responsible for exporting API GW URL

output "tf_output_aws_apigw_domain_name__domain_name"
{
  value = "${aws_api_gateway_domain_name.tf_aws_apigw_domain_for_apis.domain_name}"
}

2/ serverless.yml responsible for linking Lambda function to this API GW URL

[...]
  customDomain:
    domainName: ${env:APIGW_DOMAIN_NAME}
    basePath: /myapi
    stage: dev
    createRoute53Record: true
[...]

Here are the commands which glue them together (in my automation pipeline).

First part is responsible to read the terraform's output variable value (ie API GW URL that was created earlier) and sets itself to an environment variable APIGW_DOMAIN_NAME.

Later part initializes serverless-domain-manager plug-in responsible for mapping lambda function to APIGW URL and deploys a serverless setup.

terraform init ...
terraform refresh ...
export APIGW_DOMAIN_NAME=`terraform output tf_output_aws_apigw_domain_name__domain_name`

sls plugin install -n serverless-domain-manager
sls deploy --debug

cheers,
ram