Terraform AWS API Gateway method for lambda functions

Terraform module which created AWS API Method

These types of resources are created:

• aws_api_gateway_method
• aws_api_gateway_integration
• aws_api_gateway_method_response
• aws_api_gateway_integration_response
• aws_lambda_permission

Usage

Use in combination with:

• https://github.com/birkoff/terraform-aws-api-gateway
• https://github.com/birkoff/terraform-aws-api-method-mock
• https://github.com/birkoff/terraform-aws-lambda-function

Example:

Lambda Function:

module "my_lambda_function" {
  source           = "birkoff/lambda-function/aws"
  runtime          = "${var.runtime}"
  region           = "${var.region}"
  function_name    = "${var.function_name}"
  timeout          = "${var.timeout}"
  s3_lambda_bucket = "${var.s3_lambda_bucket}"
  s3_function_key  = "${var.source_s3_key_change_instance}"
  description      = "${var.description_chnage_instance}"
  handler          = "${var.handler_change_instance}"
  lambda_role_arn  = "${aws_iam_role.ec2manager-change-instance-state-role.arn}"
  source_arn       = "arn:aws:execute-api:${var.region}:${var.account_id}:*"
  principal        = "apigateway.amazonaws.com"

  env_vars = {
    ENV = "${var.environment}"
  }

  tags = {
    Terraform = "true"
    Environment = "${var.environment}"
  }
}

API:

module "my_api" {
  source        = "birkoff/api-gateway/aws"
  region        = "${var.region}"
  resource_path = "${var.resource_path}"
  api_name      = "${var.api_name}"
  api_description = "${var.api_description}"
}

Method GET:

module "method_get" {
  source             = "birkoff/api-method/aws"
  region             = "${var.region}"
  api_id             = "${module.my_api.id}"
  integration_type   = "AWS_PROXY"
  http_method        = "GET"
  lambda_fuction_arn = "${module.my_lambda_function.lamda_fuction_arn}"
  api_resource_id    = "${module.my_api.resource_id}"
  authorization      = "NONE"
  api_resource_path  = "${module.my_api.resource_path}"
}

Method POST:

module "method_post" {
  source             = "birkoff/api-method/aws"
  region             = "${var.region}"
  api_id             = "${module.my_api.id}"
  integration_type   = "AWS"
  http_method        = "POST"
  lambda_fuction_arn = "${module.my_lambda_function.lamda_fuction_arn}"
  api_resource_id    = "${module.my_api.resource_id}"
  authorization      = "NONE"
  api_resource_path  = "${module.my_api.resource_path}"
}

Method OPTIONS (for Jquery request)

module "method_options" {
  source             = "birkoff/api-method-mock/aws"
  region             = "${var.region}"
  api_id             = "${module.my_api.id}"
  http_method        = "OPTIONS"
  api_resource_id    = "${module.my_api.resource_id}"
  authorization      = "NONE"
  api_resource_path  = "${module.my_api.resource_path}"
  allow_methods      = "'POST,GET,OPTIONS'"
}

Deploy the API

resource "aws_api_gateway_deployment" "test" {
  depends_on = ["module.method_get", "module.method_post", "module.method_options"]
  rest_api_id = "${module.my_api.id}"
  stage_name  = "test"
  description = "test"
}

Note

When creating Infrastructure there is an issue with API Gateway and Lambda permissions To fix it:

1. Go to AWS Dashboard Amazon API Gateway
2. Select the API and go to Resources
3. Select the Resource Methods and click on "Integration Request"
4. Uncheck "Use Lambda Proxy integration" and check it Again after
5. Deploy the API to a stage

This will re-set a permission for api-gateway to execute lambda Even adding a permission on Terraform this doesn't work so it has to be done once at the moment of the creation of the Resources

License

MIT