PNGDAT-1800 Add built in support for shipping logs to sumo (#31)

lambda_function/lambda_function.tf

@@ -1,3 +1,22 @@
+locals {
+  log_group_name = var.log_group_name == null ? "/aws/lambda/${var.function_name}" : var.log_group_name
+}
+
+resource "aws_cloudwatch_log_group" "lambda_log_group" {
+  name              = local.log_group_name
+  retention_in_days = var.log_retention_in_days
+  tags              = var.log_tags == {} ? var.tags : var.log_tags
+  skip_destroy      = var.log_skip_destroy
+}
+
+resource "aws_cloudwatch_log_subscription_filter" "example_subscription_filter" {
+  count           = var.ship_logs_to_sumo ? 1 : 0
+  name            = "${var.function_name}_subscription_filter"
+  log_group_name  = aws_cloudwatch_log_group.lambda_log_group.name
+  destination_arn = "arn:aws:lambda:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:function:SumoCWLogsLambda"
+  filter_pattern  = ""
+}
+
 resource "aws_lambda_function" "lambda" {
   function_name                  = var.function_name
   description                    = var.description

lambda_function/variables.tf

@@ -159,4 +159,33 @@ variable "create_codebuild_to_run_unit_test" {
   type        = bool
   default     = false
   description = "If true, will create codebuild and all the resources for running unit tests"
+}
+
+variable "log_group_name" {
+  type        = string
+  default     = null
+  description = "If set, will create a log group with that name for the lambda, otherwise the default name (/aws/lambda/<function name>) will be used"
+}
+
+variable "log_retention_in_days" {
+  type    = number
+  default = 0 # Never expire
+}
+
+variable "log_skip_destroy" {
+  type        = bool
+  default     = true
+  description = "If true, the log group will not be destroyed when the lambda is destroyed"
+}
+
+variable "ship_logs_to_sumo" {
+  type        = bool
+  default     = false
+  description = "If true, will create a subscription filter to send logs to Sumo Logic"
+}
+
+variable "log_tags" {
+  type        = map(string)
+  default     = {}
+  description = "Tags to apply to the log group. Defaults to the same tags as the lambda function if nothing is passed in."
 }