CODEWITHSUNDEEP
terraformterraform-template-file
user4695271
user4695271

Reputation:

Import value from Terraform module

I have this skeleton for two Terraform modules I'm building: api-gateway and lambda. This is the file structure:

.
├── modules
│   ├── api-gateway
│   │   ├── main.tf
│   │   ├── outputs.tf
│   │   └── variables.tf
│   └── lambda
│       ├── main.tf
│       ├── outputs.tf
│       ├── policies
│       │   └── lambda-role.json
│       └── variables.tf
├── main.tf
├── provider.tf
├── sandbox-environment.tfvars
└── variables.tf

The (excerpt) content of modules/api-gateway/main.tf is:

resource "aws_api_gateway_integration" "lambda_root" {
  ...
  uri = "${aws_lambda_function.fn_name.invoke_arn}"
}

resource "aws_api_gateway_integration" "lambda" {
  ...
  uri = "${aws_lambda_function.fn_name.invoke_arn}"
}

module "lambda" {
  source = "../lambda"
}

The (excerpt) content of modules/lambda/main.tf is:

resource "aws_lambda_function" "fn_name" {
  filename = "${data.archive_file.fn_name.output_path}"
  ...
  runtime = "java8"
}

The problem is I can't read the value ${aws_lambda_function.fn_name.invoke_arn} in modules/api-gateway/main.tf:

$ terraform init
Initializing modules...
- module.pipeline

Error: resource 'aws_api_gateway_integration.lambda_root' config: unknown resource 'aws_lambda_function.fn_name' referenced in variable aws_lambda_function.fn_name.invoke_arn



Error: resource 'aws_api_gateway_integration.lambda' config: unknown resource 'aws_lambda_function.fn_name' referenced in variable aws_lambda_function.fn_name.invoke_arn

Is there a way to "export" that value from within modules/api-gateway/main.tf?

Upvotes: 3

Views: 2030

Answers (1)

davidhu
davidhu

Reputation: 10434

You would need to add an output variable in modules/lambda/outputs.tf. 

output "lambda_invoke_arn" {
   value = "${aws_lambda_function.fn_name.invoke_arn}"
}

Then in the modules/api-gateway/main.tf, you can reference the output of the lambda module.

resource "aws_api_gateway_integration" "lambda" {
  ...
  uri = "${module.lambda.lambda_invoke_arn}"
}

Upvotes: 2

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