feat: add function max instances argument (#66) (#67)

Author: fpoon

README.md

@@ -46,6 +46,7 @@ Then perform the following commands on the root folder:
 | function\_environment\_variables | A set of key/value environment variable pairs to assign to the function. | `map(string)` | `{}` | no |
 | function\_event\_trigger\_failure\_policy\_retry | A toggle to determine if the function should be retried on failure. | `bool` | `false` | no |
 | function\_labels | A set of key/value label pairs to assign to the function. | `map(string)` | `{}` | no |
+| function\_max\_instances | The maximum number of parallel executions of the function. | `number` | `0` | no |
 | function\_name | The name to apply to the function | `string` | n/a | yes |
 | function\_runtime | The runtime in which the function will be executed. | `string` | `"nodejs10"` | no |
 | function\_service\_account\_email | The service account to run the function as. | `string` | `""` | no |

main.tf

@@ -83,6 +83,7 @@ module "main" {
   labels                             = var.function_labels
   service_account_email              = var.function_service_account_email
   timeout_s                          = var.function_timeout_s
+  max_instances                      = var.function_max_instances
   vpc_connector                      = var.vpc_connector
   vpc_connector_egress_settings      = var.vpc_connector_egress_settings
 }

variables.tf

@@ -110,6 +110,12 @@ variable "function_service_account_email" {
   description = "The service account to run the function as."
 }
 
+variable "function_max_instances" {
+  type        = number
+  default     = 0
+  description = "The maximum number of parallel executions of the function."
+}
+
 variable "vpc_connector" {
   type        = string
   default     = null