provider/aws: aws_autoscaling_attachment resource (hashicorp#9146)

* hashicorpGH-8755 - Adding in support to attach ASG to ELB as independent action

* hashicorpGH-8755 - Adding in docs

* hashicorpGH-8755 - Adjusting attribute name and responding to other PR feedback

builtin/providers/aws/provider.go

@@ -190,6 +190,7 @@ func Provider() terraform.ResourceProvider {
 			"aws_app_cookie_stickiness_policy":             resourceAwsAppCookieStickinessPolicy(),
 			"aws_appautoscaling_target":                    resourceAwsAppautoscalingTarget(),
 			"aws_appautoscaling_policy":                    resourceAwsAppautoscalingPolicy(),
+			"aws_autoscaling_attachment":                   resourceAwsAutoscalingAttachment(),
 			"aws_autoscaling_group":                        resourceAwsAutoscalingGroup(),
 			"aws_autoscaling_notification":                 resourceAwsAutoscalingNotification(),
 			"aws_autoscaling_policy":                       resourceAwsAutoscalingPolicy(),

builtin/providers/aws/resource_aws_autoscaling_attachment.go

@@ -0,0 +1,108 @@
+package aws
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/service/autoscaling"
+	"github.com/hashicorp/errwrap"
+	"github.com/hashicorp/terraform/helper/resource"
+	"github.com/hashicorp/terraform/helper/schema"
+)
+
+func resourceAwsAutoscalingAttachment() *schema.Resource {
+	return &schema.Resource{
+		Create: resourceAwsAutoscalingAttachmentCreate,
+		Read:   resourceAwsAutoscalingAttachmentRead,
+		Delete: resourceAwsAutoscalingAttachmentDelete,
+
+		Schema: map[string]*schema.Schema{
+			"autoscaling_group_name": &schema.Schema{
+				Type:     schema.TypeString,
+				ForceNew: true,
+				Required: true,
+			},
+
+			"elb": &schema.Schema{
+				Type:     schema.TypeString,
+				ForceNew: true,
+				Required: true,
+			},
+		},
+	}
+}
+
+func resourceAwsAutoscalingAttachmentCreate(d *schema.ResourceData, meta interface{}) error {
+	asgconn := meta.(*AWSClient).autoscalingconn
+	asgName := d.Get("autoscaling_group_name").(string)
+	elbName := d.Get("elb").(string)
+
+	attachElbInput := &autoscaling.AttachLoadBalancersInput{
+		AutoScalingGroupName: aws.String(asgName),
+		LoadBalancerNames:    []*string{aws.String(elbName)},
+	}
+
+	log.Printf("[INFO] registering asg %s with ELBs %s", asgName, elbName)
+
+	if _, err := asgconn.AttachLoadBalancers(attachElbInput); err != nil {
+		return errwrap.Wrapf(fmt.Sprintf("Failure attaching AutoScaling Group %s with Elastic Load Balancer: %s: {{err}}", asgName, elbName), err)
+	}
+
+	d.SetId(resource.PrefixedUniqueId(fmt.Sprintf("%s-", asgName)))
+
+	return resourceAwsAutoscalingAttachmentRead(d, meta)
+}
+
+func resourceAwsAutoscalingAttachmentRead(d *schema.ResourceData, meta interface{}) error {
+	asgconn := meta.(*AWSClient).autoscalingconn
+	asgName := d.Get("autoscaling_group_name").(string)
+	elbName := d.Get("elb").(string)
+
+	// Retrieve the ASG properites to get list of associated ELBs
+	asg, err := getAwsAutoscalingGroup(asgName, asgconn)
+
+	if err != nil {
+		return err
+	}
+	if asg == nil {
+		log.Printf("[INFO] Autoscaling Group %q not found", asgName)
+		d.SetId("")
+		return nil
+	}
+
+	found := false
+	for _, i := range asg.LoadBalancerNames {
+		if elbName == *i {
+			d.Set("elb", elbName)
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		log.Printf("[WARN] Association for %s was not found in ASG assocation", elbName)
+		d.SetId("")
+	}
+
+	return nil
+}
+
+func resourceAwsAutoscalingAttachmentDelete(d *schema.ResourceData, meta interface{}) error {
+	asgconn := meta.(*AWSClient).autoscalingconn
+	asgName := d.Get("autoscaling_group_name").(string)
+	elbName := d.Get("elb").(string)
+
+	log.Printf("[INFO] Deleting ELB %s association from: %s", elbName, asgName)
+
+	detachOpts := &autoscaling.DetachLoadBalancersInput{
+		AutoScalingGroupName: aws.String(asgName),
+		LoadBalancerNames:    []*string{aws.String(elbName)},
+	}
+
+	if _, err := asgconn.DetachLoadBalancers(detachOpts); err != nil {
+		return errwrap.Wrapf(fmt.Sprintf("Failure detaching AutoScaling Group %s with Elastic Load Balancer: %s: {{err}}", asgName, elbName), err)
+	}
+
+	return nil
+}

builtin/providers/aws/resource_aws_autoscaling_attachment_test.go

@@ -0,0 +1,144 @@
+package aws
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/service/autoscaling"
+	"github.com/hashicorp/terraform/helper/resource"
+	"github.com/hashicorp/terraform/terraform"
+)
+
+func TestAccAwsAutoscalingAttachment_basic(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:  func() { testAccPreCheck(t) },
+		Providers: testAccProviders,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccAWSAutoscalingAttachment_basic,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSAutocalingAttachmentExists("aws_autoscaling_group.asg", 0),
+				),
+			},
+			// Add in one association
+			resource.TestStep{
+				Config: testAccAWSAutoscalingAttachment_associated,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSAutocalingAttachmentExists("aws_autoscaling_group.asg", 1),
+				),
+			},
+			// Test adding a 2nd
+			resource.TestStep{
+				Config: testAccAWSAutoscalingAttachment_double_associated,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSAutocalingAttachmentExists("aws_autoscaling_group.asg", 2),
+				),
+			},
+			// Now remove that newest one
+			resource.TestStep{
+				Config: testAccAWSAutoscalingAttachment_associated,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSAutocalingAttachmentExists("aws_autoscaling_group.asg", 1),
+				),
+			},
+			// Now remove them both
+			resource.TestStep{
+				Config: testAccAWSAutoscalingAttachment_basic,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSAutocalingAttachmentExists("aws_autoscaling_group.asg", 0),
+				),
+			},
+		},
+	})
+}
+
+func testAccCheckAWSAutocalingAttachmentExists(asgname string, loadBalancerCount int) resource.TestCheckFunc {
+	return func(s *terraform.State) error {
+		rs, ok := s.RootModule().Resources[asgname]
+		if !ok {
+			return fmt.Errorf("Not found: %s", asgname)
+		}
+
+		conn := testAccProvider.Meta().(*AWSClient).autoscalingconn
+		asg := rs.Primary.ID
+
+		actual, err := conn.DescribeAutoScalingGroups(&autoscaling.DescribeAutoScalingGroupsInput{
+			AutoScalingGroupNames: []*string{aws.String(asg)},
+		})
+
+		if err != nil {
+			return fmt.Errorf("Recieved an error when attempting to load %s:  %s", asg, err)
+		}
+
+		if loadBalancerCount != len(actual.AutoScalingGroups[0].LoadBalancerNames) {
+			return fmt.Errorf("Error: ASG has the wrong number of load balacners associated.  Expected [%d] but got [%d]", loadBalancerCount, len(actual.AutoScalingGroups[0].LoadBalancerNames))
+		}
+
+		return nil
+	}
+}
+
+const testAccAWSAutoscalingAttachment_basic = `
+resource "aws_elb" "foo" {
+  availability_zones = ["us-west-2a", "us-west-2b", "us-west-2c"]
+
+  listener {
+    instance_port     = 8000
+    instance_protocol = "http"
+    lb_port           = 80
+    lb_protocol       = "http"
+  }
+}
+
+resource "aws_elb" "bar" {
+  availability_zones = ["us-west-2a", "us-west-2b", "us-west-2c"]
+
+  listener {
+    instance_port     = 8000
+    instance_protocol = "http"
+    lb_port           = 80
+    lb_protocol       = "http"
+  }
+}
+
+resource "aws_launch_configuration" "as_conf" {
+    name = "test_config"
+    image_id = "ami-f34032c3"
+    instance_type = "t1.micro"
+}
+
+resource "aws_autoscaling_group" "asg" {
+  availability_zones = ["us-west-2a", "us-west-2b", "us-west-2c"]
+  name = "asg-lb-assoc-terraform-test"
+  max_size = 1
+  min_size = 0
+  desired_capacity = 0
+  health_check_grace_period = 300
+  force_delete = true
+  launch_configuration = "${aws_launch_configuration.as_conf.name}"
+
+  tag {
+    key = "Name"
+    value = "terraform-asg-lg-assoc-test"
+    propagate_at_launch = true
+  }
+}
+
+`
+
+const testAccAWSAutoscalingAttachment_associated = testAccAWSAutoscalingAttachment_basic + `
+resource "aws_autoscaling_attachment" "asg_attachment_foo" {
+  autoscaling_group_name = "${aws_autoscaling_group.asg.id}"
+  elb                    = "${aws_elb.foo.id}"
+}
+
+`
+
+const testAccAWSAutoscalingAttachment_double_associated = testAccAWSAutoscalingAttachment_associated + `
+resource "aws_autoscaling_attachment" "asg_attachment_bar" {
+  autoscaling_group_name = "${aws_autoscaling_group.asg.id}"
+  elb                    = "${aws_elb.bar.id}"
+}
+
+`

builtin/providers/aws/resource_aws_autoscaling_group.go

@@ -109,6 +109,7 @@ func resourceAwsAutoscalingGroup() *schema.Resource {
 			"load_balancers": &schema.Schema{
 				Type:     schema.TypeSet,
 				Optional: true,
+				Computed: true,
 				Elem:     &schema.Schema{Type: schema.TypeString},
 				Set:      schema.HashString,
 			},

website/source/docs/providers/aws/r/autoscaling_attachment.html.markdown

@@ -0,0 +1,35 @@
+---
+layout: "aws"
+page_title: "AWS: aws_autoscaling_attachment"
+sidebar_current: "docs-aws-resource-autoscaling-attachment"
+description: |-
+  Provides an AutoScaling Group Attachment resource.
+---
+
+# aws\_autoscaling\_attachment
+
+Provides an AutoScaling Attachment resource.
+
+~> **NOTE on AutoScaling Groups and ASG Attachments:** Terraform currently provides
+both a standalone ASG Attachment resource (describing an ASG attached to
+an ELB), and an [AutoScaling Group resource](autoscaling_group.html) with
+`load_balancers` defined in-line. At this time you cannot use an ASG with in-line
+load balancers in conjunction with an ASG Attachment resource. Doing so will cause a
+conflict and will overwrite attachments.
+## Example Usage
+
+```
+# Create a new load balancer attachment
+resource "aws_autoscaling_attachment" "asg_attachment_bar" {
+  autoscaling_group_name = "${aws_autoscaling_group.asg.id}"
+  elb                    = "${aws_elb.bar.id}"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `autoscaling_group_name` - (Required) Name of ASG to associate with the ELB.
+* `elb` - (Required) The name of the ELB.
+

website/source/layouts/aws.erb

@@ -295,6 +295,10 @@
                             <a href="/docs/providers/aws/r/autoscaling_group.html">aws_autoscaling_group</a>
                         </li>
 
+                        <li<%= sidebar_current("docs-aws-resource-autoscaling-attachment") %>>
+                            <a href="/docs/providers/aws/r/autoscaling_attachment.html">aws_autoscaling_attachment</a>
+                        </li>
+
                         <li<%= sidebar_current("docs-aws-resource-autoscaling-lifecycle-hook") %>>
                             <a href="/docs/providers/aws/r/autoscaling_lifecycle_hooks.html">aws_autoscaling_lifecycle_hook</a>
                         </li>