Add compute instance group data source

google/data_source_google_compute_instance_group.go

@@ -0,0 +1,83 @@
+package google
+
+import (
+	"fmt"
+
+	"github.com/hashicorp/terraform/helper/schema"
+)
+
+func dataSourceGoogleComputeInstanceGroup() *schema.Resource {
+	return &schema.Resource{
+		Read: dataSourceComputeInstanceGroupRead,
+		Schema: map[string]*schema.Schema{
+			"name": {
+				Type:     schema.TypeString,
+				Required: true,
+			},
+
+			"zone": {
+				Type:     schema.TypeString,
+				Required: true,
+			},
+
+			"project": {
+				Type:     schema.TypeString,
+				Optional: true,
+			},
+
+			"description": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+
+			"instances": {
+				Type:     schema.TypeSet,
+				Computed: true,
+				Elem:     &schema.Schema{Type: schema.TypeString},
+				Set:      schema.HashString,
+			},
+
+			"named_port": {
+				Type:     schema.TypeList,
+				Computed: true,
+				Elem: &schema.Resource{
+					Schema: map[string]*schema.Schema{
+						"name": {
+							Type:     schema.TypeString,
+							Required: true,
+						},
+
+						"port": {
+							Type:     schema.TypeInt,
+							Required: true,
+						},
+					},
+				},
+			},
+
+			"network": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+
+			"self_link": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+
+			"size": {
+				Type:     schema.TypeInt,
+				Computed: true,
+			},
+		},
+	}
+}
+
+func dataSourceComputeInstanceGroupRead(d *schema.ResourceData, meta interface{}) error {
+	zone := d.Get("zone").(string)
+	name := d.Get("name").(string)
+
+	d.SetId(fmt.Sprintf("%s/%s", zone, name))
+
+	return resourceComputeInstanceGroupRead(d, meta)
+}

google/data_source_google_compute_instance_group_test.go

@@ -0,0 +1,253 @@
+package google
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"sort"
+	"strconv"
+	"strings"
+	"testing"
+
+	"github.com/hashicorp/terraform/helper/acctest"
+	"github.com/hashicorp/terraform/helper/resource"
+	"github.com/hashicorp/terraform/terraform"
+)
+
+func TestAccDataSourceGoogleComputeInstanceGroup_basic(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:  func() { testAccPreCheck(t) },
+		Providers: testAccProviders,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccCheckDataSourceGoogleComputeInstanceGroupConfig,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckDataSourceGoogleComputeInstanceGroup("data.google_compute_instance_group.test"),
+				),
+			},
+		},
+	})
+}
+
+func TestAccDataSourceGoogleComputeInstanceGroup_withNamedPort(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:  func() { testAccPreCheck(t) },
+		Providers: testAccProviders,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccCheckDataSourceGoogleComputeInstanceGroupConfigWithNamedPort,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckDataSourceGoogleComputeInstanceGroup("data.google_compute_instance_group.test"),
+				),
+			},
+		},
+	})
+}
+
+func testAccCheckDataSourceGoogleComputeInstanceGroup(dataSourceName string) resource.TestCheckFunc {
+	return func(s *terraform.State) error {
+		dsFullName := "data.google_compute_instance_group.test"
+		rsFullName := "google_compute_instance_group.test"
+		ds, ok := s.RootModule().Resources[dsFullName]
+		if !ok {
+			return fmt.Errorf("cant' find resource called %s in state", dsFullName)
+		}
+
+		rs, ok := s.RootModule().Resources[rsFullName]
+		if !ok {
+			return fmt.Errorf("can't find data source called %s in state", rsFullName)
+		}
+
+		dsAttrs := ds.Primary.Attributes
+		rsAttrs := rs.Primary.Attributes
+
+		attrsToTest := []string{
+			"id",
+			"name",
+			"zone",
+			"project",
+			"description",
+			"network",
+			"self_link",
+			"size",
+		}
+
+		for _, attrToTest := range attrsToTest {
+			if dsAttrs[attrToTest] != rsAttrs[attrToTest] {
+				return fmt.Errorf("%s is %s; want %s", attrToTest, dsAttrs[attrToTest], rsAttrs[attrToTest])
+			}
+		}
+
+		dsNamedPortsCount, ok := dsAttrs["named_port.#"]
+		if !ok {
+			return errors.New("can't find 'named_port' attribute in data source")
+		}
+
+		dsNoOfNamedPorts, err := strconv.Atoi(dsNamedPortsCount)
+		if err != nil {
+			return errors.New("failed to read number of named ports in data source")
+		}
+
+		rsNamedPortsCount, ok := rsAttrs["named_port.#"]
+		if !ok {
+			return errors.New("can't find 'named_port' attribute in resource")
+		}
+
+		rsNoOfNamedPorts, err := strconv.Atoi(rsNamedPortsCount)
+		if err != nil {
+			return errors.New("failed to read number of named ports in resource")
+		}
+
+		if dsNoOfNamedPorts != rsNoOfNamedPorts {
+			return fmt.Errorf(
+				"expected %d number of named port, received %d, this is most likely a bug",
+				rsNoOfNamedPorts,
+				dsNoOfNamedPorts,
+			)
+		}
+
+		namedPortItemKeys := []string{"name", "value"}
+		for i := 0; i < dsNoOfNamedPorts; i++ {
+			for _, key := range namedPortItemKeys {
+				idx := fmt.Sprintf("named_port.%d.%s", i, key)
+				if dsAttrs[idx] != rsAttrs[idx] {
+					return fmt.Errorf("%s is %s; want %s", idx, dsAttrs[idx], rsAttrs[idx])
+				}
+			}
+		}
+
+		dsInstancesCount, ok := dsAttrs["instances.#"]
+		if !ok {
+			return errors.New("can't find 'instances' attribute in data source")
+		}
+
+		dsNoOfInstances, err := strconv.Atoi(dsInstancesCount)
+		if err != nil {
+			return errors.New("failed to read number of named ports in data source")
+		}
+
+		rsInstancesCount, ok := rsAttrs["instances.#"]
+		if !ok {
+			return errors.New("can't find 'instances' attribute in resource")
+		}
+
+		rsNoOfInstances, err := strconv.Atoi(rsInstancesCount)
+		if err != nil {
+			return errors.New("failed to read number of instances in resource")
+		}
+
+		if dsNoOfInstances != rsNoOfInstances {
+			return fmt.Errorf(
+				"expected %d number of instances, received %d, this is most likely a bug",
+				rsNoOfInstances,
+				dsNoOfInstances,
+			)
+		}
+
+		// We don't know the exact keys of the elements, so go through the whole list looking for matching ones
+		dsInstancesValues := []string{}
+		for k, v := range dsAttrs {
+			if strings.HasPrefix(k, "instances") && !strings.HasSuffix(k, "#") {
+				dsInstancesValues = append(dsInstancesValues, v)
+			}
+		}
+
+		rsInstancesValues := []string{}
+		for k, v := range rsAttrs {
+			if strings.HasPrefix(k, "instances") && !strings.HasSuffix(k, "#") {
+				rsInstancesValues = append(rsInstancesValues, v)
+			}
+		}
+
+		sort.Strings(dsInstancesValues)
+		sort.Strings(rsInstancesValues)
+
+		if !reflect.DeepEqual(dsInstancesValues, rsInstancesValues) {
+			return fmt.Errorf("expected %v list of instances, received %v", rsInstancesValues, dsInstancesValues)
+		}
+
+		return nil
+	}
+}
+
+var testAccCheckDataSourceGoogleComputeInstanceGroupConfig = fmt.Sprintf(`
+resource "google_compute_instance" "test" {
+  name         = "tf-test-%s"
+  machine_type = "n1-standard-1"
+  zone         = "us-central1-a"
+
+  boot_disk {
+    initialize_params {
+      image = "debian-cloud/debian-8"
+    }
+  }
+
+  network_interface {
+    network = "default"
+
+    access_config {
+      // Ephemeral IP
+    }
+  }
+}
+
+resource "google_compute_instance_group" "test" {
+  name = "tf-test-%s"
+  zone = "${google_compute_instance.test.zone}"
+
+  instances = [
+    "${google_compute_instance.test.self_link}",
+  ]
+}
+
+data "google_compute_instance_group" "test" {
+  name = "${google_compute_instance_group.test.name}"
+  zone = "${google_compute_instance_group.test.zone}"
+}
+`, acctest.RandString(10), acctest.RandString(10))
+
+var testAccCheckDataSourceGoogleComputeInstanceGroupConfigWithNamedPort = fmt.Sprintf(`
+resource "google_compute_instance" "test" {
+  name         = "tf-test-%s"
+  machine_type = "n1-standard-1"
+  zone         = "us-central1-a"
+
+  boot_disk {
+    initialize_params {
+      image = "debian-cloud/debian-8"
+    }
+  }
+
+  network_interface {
+    network = "default"
+
+    access_config {
+      // Ephemeral IP
+    }
+  }
+}
+
+resource "google_compute_instance_group" "test" {
+  name = "tf-test-%s"
+  zone = "${google_compute_instance.test.zone}"
+
+  named_port {
+    name = "http"
+    port = "8080"
+  }
+
+  named_port {
+    name = "https"
+    port = "8443"
+  }
+
+  instances = [
+    "${google_compute_instance.test.self_link}",
+  ]
+}
+
+data "google_compute_instance_group" "test" {
+  name = "${google_compute_instance_group.test.name}"
+  zone = "${google_compute_instance_group.test.zone}"
+}
+`, acctest.RandString(10), acctest.RandString(10))

google/provider.go

@@ -58,6 +58,7 @@ func Provider() terraform.ResourceProvider {
 			"google_compute_network":           dataSourceGoogleComputeNetwork(),
 			"google_compute_subnetwork":        dataSourceGoogleComputeSubnetwork(),
 			"google_compute_zones":             dataSourceGoogleComputeZones(),
+			"google_compute_instance_group":    dataSourceGoogleComputeInstanceGroup(),
 			"google_container_engine_versions": dataSourceGoogleContainerEngineVersions(),
 			"google_iam_policy":                dataSourceGoogleIamPolicy(),
 			"google_storage_object_signed_url": dataSourceGoogleSignedUrl(),

website/docs/d/google_compute_instance_group.html.markdown

@@ -0,0 +1,49 @@
+---
+layout: "google"
+page_title: "Google: google_compute_instance_group"
+sidebar_current: "docs-google-datasource-compute-instance-group"
+description: |-
+  Get a Compute Instance Group within GCE.
+---
+
+# google\_compute\_instance\_group
+
+Get a Compute Instance Group within GCE.
+For more information, see [the official documentation](https://cloud.google.com/compute/docs/instance-groups/#unmanaged_instance_groups)
+and [API](https://cloud.google.com/compute/docs/reference/latest/instanceGroups)
+
+```
+data "google_compute_instance_group" "all" {
+	name = "instance-group-name"
+	zone = "us-central1-a"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `name` - (Required) The name of the instance group.
+
+* `zone` - (Required) The zone of the instance group.
+
+- - -
+
+* `project` - (Optional) The project in which the resource belongs. If it
+    is not provided, the provider project is used.
+
+## Attributes Reference
+
+The following arguments are exported:
+
+* `description` - Textual description of the instance group.
+
+* `instances` - List of instances in the group.
+
+* `named_port` - List of named ports in the group. 
+
+* `network` - The URL of the network the instance group is in.
+
+* `self_link` - The URI of the resource.
+
+* `size` - The number of instances in the group.