Add test for global INTERNAL_SELF_MANAGED backend service. Documentat…

…ion update

products/compute/api.yaml

@@ -571,8 +571,10 @@ objects:
     description: |
       A Backend Service defines a group of virtual machines that will serve
       traffic for load balancing. This resource is a global backend service,
-      appropriate for external load balancing. For internal load balancing, use
-      a regional backend service instead.
+      appropriate for external load balancing or self-managed internal load balancing. 
+      For managed internal load balancing, use a regional backend service instead.
+
+      Currently self-managed internal load balancing is only available in beta.
     references: !ruby/object:Api::Resource::ReferenceLinks
       guides:
         'Official Documentation': 'https://cloud.google.com/compute/docs/load-balancing/http/backend-service'

products/compute/terraform.yaml

@@ -176,6 +176,14 @@ overrides: !ruby/object:Overrides::ResourceOverrides
         vars:
           backend_service_name: "backend-service"
           http_health_check_name: "health-check"
+      - !ruby/object:Provider::Terraform::Examples
+        name: "backend_service_global_internal"
+        min_version: beta
+        primary_resource_id: "default"
+        vars:
+          forwarding_rule_name: "global-rule"
+          http_proxy_name: "target-proxy"
+          backend_service_name: "backend"
     custom_code: !ruby/object:Provider::Terraform::CustomCode
       constants: 'templates/terraform/constants/backend_service.go.erb'
       encoder: 'templates/terraform/encoders/backend_service.go.erb'

templates/terraform/examples/backend_service_global_internal.tf.erb

@@ -0,0 +1,100 @@
+resource "google_compute_global_forwarding_rule" "default" {
+  provider              = "google-beta"
+  name                  = "<%= ctx[:vars]['forwarding_rule_name'] %>"
+  target                = "${google_compute_target_http_proxy.default.self_link}"
+  port_range            = "80"
+  load_balancing_scheme = "INTERNAL_SELF_MANAGED"
+  ip_address            = "0.0.0.0"
+}
+
+resource "google_compute_target_http_proxy" "default" {
+  provider    = "google-beta"
+  name        = "<%= ctx[:vars]['http_proxy_name'] %>"
+  description = "a description"
+  url_map     = "${google_compute_url_map.default.self_link}"
+}
+
+resource "google_compute_url_map" "default" {
+  provider         = "google-beta"
+  name            = "url-map-<%= ctx[:vars]['http_proxy_name'] %>"
+  description     = "a description"
+  default_service = "${google_compute_backend_service.default.self_link}"
+
+  host_rule {
+    hosts        = ["mysite.com"]
+    path_matcher = "allpaths"
+  }
+
+  path_matcher {
+    name            = "allpaths"
+    default_service = "${google_compute_backend_service.default.self_link}"
+
+    path_rule {
+      paths   = ["/*"]
+      service = "${google_compute_backend_service.default.self_link}"
+    }
+  }
+}
+
+resource "google_compute_backend_service" "default" {
+  provider              = "google-beta"
+  name                  = "<%= ctx[:vars]['backend_service_name'] %>"
+  port_name             = "http"
+  protocol              = "HTTP"
+  timeout_sec           = 10
+  load_balancing_scheme = "INTERNAL_SELF_MANAGED"
+
+  backend {
+    group = "${google_compute_instance_group_manager.foobar.instance_group}"
+    balancing_mode = "RATE"
+    capacity_scaler = 0.4
+    max_rate_per_instance = 50
+  }
+
+  health_checks = ["${google_compute_health_check.default.self_link}"]
+}
+
+data "google_compute_image" "debian_image" {
+  provider = "google-beta"
+  family   = "debian-9"
+  project  = "debian-cloud"
+}
+
+resource "google_compute_instance_group_manager" "foobar" {
+  provider           = "google-beta"
+  name               = "igm-internal"
+  version {
+    instance_template  = "${google_compute_instance_template.foobar.self_link}"
+    name               = "primary"
+  }
+  base_instance_name = "foobar"
+  zone               = "us-central1-f"
+  target_size        = 1
+}
+
+resource "google_compute_instance_template" "foobar" {
+  provider     = "google-beta"
+  name         = "instance-template-internal"
+  machine_type = "n1-standard-1"
+
+  network_interface {
+    network = "default"
+  }
+
+  disk {
+    source_image = "${data.google_compute_image.debian_image.self_link}"
+    auto_delete  = true
+    boot         = true
+  }
+}
+
+resource "google_compute_health_check" "default" {
+  provider           = "google-beta"
+  name               = "check-<%= ctx[:vars]['backend_service_name'] %>"
+  check_interval_sec = 1
+  timeout_sec        = 1
+
+  tcp_health_check {
+    port = "80"
+  }
+}