provider/aws: Add support for `cname_prefix` to `aws_elastic_beanstalk_environment`.

builtin/providers/aws/resource_aws_elastic_beanstalk_environment.go

@@ -3,6 +3,7 @@ package aws
 import (
 	"fmt"
 	"log"
+	"regexp"
 	"sort"
 	"strings"
 	"time"
@@ -60,9 +61,16 @@ func resourceAwsElasticBeanstalkEnvironment() *schema.Resource {
 				Type:     schema.TypeString,
 				Computed: true,
 			},
+			"cname_prefix": &schema.Schema{
+				Type:     schema.TypeString,
+				Computed: true,
+				Optional: true,
+				ForceNew: true,
+			},
 			"tier": &schema.Schema{
 				Type:     schema.TypeString,
 				Optional: true,
+				Default:  "WebServer",
 				ValidateFunc: func(v interface{}, k string) (ws []string, errors []error) {
 					value := v.(string)
 					switch value {
@@ -127,7 +135,7 @@ func resourceAwsElasticBeanstalkEnvironmentCreate(d *schema.ResourceData, meta i
 
 	// Get values from config
 	name := d.Get("name").(string)
-	cname := d.Get("cname").(string)
+	cnamePrefix := d.Get("cname_prefix").(string)
 	tier := d.Get("tier").(string)
 	app := d.Get("application").(string)
 	desc := d.Get("description").(string)
@@ -153,8 +161,11 @@ func resourceAwsElasticBeanstalkEnvironmentCreate(d *schema.ResourceData, meta i
 		createOpts.Description = aws.String(desc)
 	}
 
-	if cname != "" {
+	if cnamePrefix != "" {
-		createOpts.CNAMEPrefix = aws.String(cname)
+		if tier != "WebServer" {
+			return fmt.Errorf("Cannont set cname_prefix for tier: %s.", tier)
+		}
+		createOpts.CNAMEPrefix = aws.String(cnamePrefix)
 	}
 
 	if tier != "" {
@@ -300,6 +311,7 @@ func resourceAwsElasticBeanstalkEnvironmentRead(d *schema.ResourceData, meta int
 
 	app := d.Get("application").(string)
 	envId := d.Id()
+	tier := d.Get("tier").(string)
 
 	log.Printf("[DEBUG] Elastic Beanstalk environment read %s: id %s", d.Get("name").(string), d.Id())
 
@@ -338,6 +350,22 @@ func resourceAwsElasticBeanstalkEnvironmentRead(d *schema.ResourceData, meta int
 		return err
 	}
 
+	if tier == "WebServer" {
+		beanstalkCnamePrefixRegexp := regexp.MustCompile(`(^[^.]+).\w{2}-\w{4}-\d.elasticbeanstalk.com$`)
+		var cnamePrefix string
+		cnamePrefixMatch := beanstalkCnamePrefixRegexp.FindStringSubmatch(*env.CNAME)
+
+		if cnamePrefixMatch == nil {
+			cnamePrefix = ""
+		} else {
+			cnamePrefix = cnamePrefixMatch[1]
+		}
+
+		if err := d.Set("cname_prefix", cnamePrefix); err != nil {
+			return err
+		}
+	}
+
 	return resourceAwsElasticBeanstalkEnvironmentSettingsRead(d, meta)
 }
 

builtin/providers/aws/resource_aws_elastic_beanstalk_environment_test.go

@@ -3,11 +3,13 @@ package aws
 import (
 	"fmt"
 	"log"
+	"regexp"
 	"testing"
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/awserr"
 	"github.com/aws/aws-sdk-go/service/elasticbeanstalk"
+	"github.com/hashicorp/terraform/helper/acctest"
 	"github.com/hashicorp/terraform/helper/resource"
 	"github.com/hashicorp/terraform/terraform"
 )
@@ -48,6 +50,28 @@ func TestAccAWSBeanstalkEnv_tier(t *testing.T) {
 	})
 }
 
+func TestAccAWSBeanstalkEnv_cname_prefix(t *testing.T) {
+	var app elasticbeanstalk.EnvironmentDescription
+	cnamePrefix := acctest.RandString(8)
+	beanstalkCnameRegexp := regexp.MustCompile("^" + cnamePrefix + ".+?elasticbeanstalk.com$")
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckBeanstalkEnvDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccBeanstalkEnvCnamePrefixConfig(cnamePrefix),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckBeanstalkEnvExists("aws_elastic_beanstalk_environment.tfenvtest", &app),
+					resource.TestMatchResourceAttr(
+						"aws_elastic_beanstalk_environment.tfenvtest", "cname", beanstalkCnameRegexp),
+				),
+			},
+		},
+	})
+}
+
 func testAccCheckBeanstalkEnvDestroy(s *terraform.State) error {
 	conn := testAccProvider.Meta().(*AWSClient).elasticbeanstalkconn
 
@@ -183,3 +207,19 @@ resource "aws_elastic_beanstalk_environment" "tfenvtest" {
   solution_stack_name = "64bit Amazon Linux 2015.09 v2.0.4 running Go 1.4"
 }
 `
+
+func testAccBeanstalkEnvCnamePrefixConfig(randString string) string {
+	return fmt.Sprintf(`
+resource "aws_elastic_beanstalk_application" "tftest" {
+name = "tf-test-name"
+description = "tf-test-desc"
+}
+
+resource "aws_elastic_beanstalk_environment" "tfenvtest" {
+name = "tf-test-name"
+application = "${aws_elastic_beanstalk_application.tftest.name}"
+cname_prefix = "%s"
+solution_stack_name = "64bit Amazon Linux 2015.09 v2.0.4 running Go 1.4"
+}
+`, randString)
+}

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

@@ -39,6 +39,8 @@ The following arguments are supported:
   in the application URL
 * `application` – (Required) Name of the application that contains the version
   to be deployed
+* `cname_prefix` - (Optional) Prefix to use for the fully qualified DNS name of
+  the Environment.
 * `description` - (Optional) Short description of the Environment
 * `tier` - (Optional) Elastic Beanstalk Environment tier. Valid values are `Worker`
   or `WebServer`. If tier is left blank `WebServer` will be used.
@@ -52,7 +54,7 @@ off of. Example stacks can be found in the [Amazon API documentation][1]
 * `wait_for_ready_timeout` - (Default: "10m") The maximum
   [duration](https://golang.org/pkg/time/#ParseDuration) that Terraform should
   wait for an Elastic Beanstalk Environment to be in a ready state before timing
-  out. 
+  out.
 * `tags` – (Optional) A set of tags to apply to the Environment. **Note:** at
 this time the Elastic Beanstalk API does not provide a programatic way of
 changing these tags after initial application
@@ -80,6 +82,7 @@ The following attributes are exported:
 * `all_settings` – List of all option settings configured in the Environment. These
   are a combination of default settings and their overrides from `settings` in
   the configuration
+* `cname` - Fully qualified DNS name for the Environment.
 
 
 [1]: http://docs.aws.amazon.com/fr_fr/elasticbeanstalk/latest/dg/concepts.platforms.html