provider/aws: Add support for alias record to Route53

builtin/providers/aws/resource_aws_route53_record.go

@@ -1,6 +1,7 @@
 package aws
 
 import (
+	"bytes"
 	"fmt"
 	"log"
 	"strings"
@@ -42,7 +43,8 @@ func resourceAwsRoute53Record() *schema.Resource {
 
 			"ttl": &schema.Schema{
 				Type:          schema.TypeInt,
-				Required: true,
+				Optional:      true,
+				ConflictsWith: []string{"alias"},
 			},
 
 			"weight": &schema.Schema{
@@ -56,10 +58,36 @@ func resourceAwsRoute53Record() *schema.Resource {
 				ForceNew: true,
 			},
 
+			"alias": &schema.Schema{
+				Type:          schema.TypeSet,
+				Optional:      true,
+				ConflictsWith: []string{"records", "ttl"},
+				Elem: &schema.Resource{
+					Schema: map[string]*schema.Schema{
+						"zone_id": &schema.Schema{
+							Type:     schema.TypeString,
+							Required: true,
+						},
+
+						"name": &schema.Schema{
+							Type:     schema.TypeString,
+							Required: true,
+						},
+
+						"evaluate_target_health": &schema.Schema{
+							Type:     schema.TypeBool,
+							Required: true,
+						},
+					},
+				},
+				Set: resourceAwsRoute53AliasRecordHash,
+			},
+
 			"records": &schema.Schema{
 				Type:          schema.TypeSet,
+				ConflictsWith: []string{"alias"},
 				Elem:          &schema.Schema{Type: schema.TypeString},
-				Required: true,
+				Optional:      true,
 				Set: func(v interface{}) int {
 					return hashcode.String(v.(string))
 				},
@@ -309,10 +337,6 @@ func resourceAwsRoute53RecordDelete(d *schema.ResourceData, meta interface{}) er
 }
 
 func resourceAwsRoute53RecordBuildSet(d *schema.ResourceData, zoneName string) (*route53.ResourceRecordSet, error) {
-	recs := d.Get("records").(*schema.Set).List()
-
-	records := expandResourceRecords(recs, d.Get("type").(string))
-
 	// get expanded name
 	en := expandRecordName(d.Get("name").(string), zoneName)
 
@@ -323,8 +347,31 @@ func resourceAwsRoute53RecordBuildSet(d *schema.ResourceData, zoneName string) (
 	rec := &route53.ResourceRecordSet{
 		Name: aws.String(en),
 		Type: aws.String(d.Get("type").(string)),
-		TTL:             aws.Long(int64(d.Get("ttl").(int))),
+	}
-		ResourceRecords: records,
+
+	if v, ok := d.GetOk("ttl"); ok {
+		rec.TTL = aws.Long(int64(v.(int)))
+	}
+
+	// Resource records
+	if v, ok := d.GetOk("records"); ok {
+		recs := v.(*schema.Set).List()
+		rec.ResourceRecords = expandResourceRecords(recs, d.Get("type").(string))
+	}
+
+	// Alias record
+	if v, ok := d.GetOk("alias"); ok {
+		aliases := v.(*schema.Set).List()
+		if len(aliases) > 1 {
+			return nil, fmt.Errorf("You can only define a single alias target per record")
+		}
+		alias := aliases[0].(map[string]interface{})
+		rec.AliasTarget = &route53.AliasTarget{
+			DNSName:              aws.String(alias["name"].(string)),
+			EvaluateTargetHealth: aws.Boolean(alias["evaluate_target_health"].(bool)),
+			HostedZoneID:         aws.String(alias["zone_id"].(string)),
+		}
+		log.Printf("[DEBUG] Creating alias: %#v", alias)
 	}
 
 	if v, ok := d.GetOk("weight"); ok {
@@ -370,3 +417,13 @@ func expandRecordName(name, zone string) string {
 	}
 	return rn
 }
+
+func resourceAwsRoute53AliasRecordHash(v interface{}) int {
+	var buf bytes.Buffer
+	m := v.(map[string]interface{})
+	buf.WriteString(fmt.Sprintf("%s-", m["name"].(string)))
+	buf.WriteString(fmt.Sprintf("%s-", m["zone_id"].(string)))
+	buf.WriteString(fmt.Sprintf("%t-", m["evaluate_target_health"].(bool)))
+
+	return hashcode.String(buf.String())
+}

builtin/providers/aws/resource_aws_route53_record_test.go

@@ -139,6 +139,57 @@ func TestAccRoute53Record_weighted(t *testing.T) {
 	})
 }
 
+func TestAccRoute53Record_alias(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckRoute53RecordDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccRoute53ElbAliasRecord,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckRoute53RecordExists("aws_route53_record.elb_alias"),
+				),
+			},
+
+			resource.TestStep{
+				Config: testAccRoute53AliasRecord,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckRoute53RecordExists("aws_route53_record.origin"),
+					testAccCheckRoute53RecordExists("aws_route53_record.alias"),
+				),
+			},
+		},
+	})
+}
+
+func TestAccRoute53Record_weighted_alias(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckRoute53RecordDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccRoute53WeightedElbAliasRecord,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckRoute53RecordExists("aws_route53_record.elb_weighted_alias_live"),
+					testAccCheckRoute53RecordExists("aws_route53_record.elb_weighted_alias_dev"),
+				),
+			},
+
+			resource.TestStep{
+				Config: testAccRoute53WeightedR53AliasRecord,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckRoute53RecordExists("aws_route53_record.green_origin"),
+					testAccCheckRoute53RecordExists("aws_route53_record.r53_weighted_alias_live"),
+					testAccCheckRoute53RecordExists("aws_route53_record.blue_origin"),
+					testAccCheckRoute53RecordExists("aws_route53_record.r53_weighted_alias_dev"),
+				),
+			},
+		},
+	})
+}
+
 func testAccCheckRoute53RecordDestroy(s *terraform.State) error {
 	conn := testAccProvider.Meta().(*AWSClient).r53conn
 	for _, rs := range s.RootModule().Resources {
@@ -325,3 +376,171 @@ resource "aws_route53_record" "www-live" {
   records = ["dev.notexample.com"]
 }
 `
+
+const testAccRoute53ElbAliasRecord = `
+resource "aws_route53_zone" "main" {
+  name = "notexample.com"
+}
+
+resource "aws_route53_record" "alias" {
+  zone_id = "${aws_route53_zone.main.zone_id}"
+  name = "www"
+  type = "A"
+
+  alias {
+  	zone_id = "${aws_elb.main.zone_id}"
+  	name = "${aws_elb.main.dns_name}"
+  	evaluate_target_health = true
+  }
+}
+
+resource "aws_elb" "main" {
+  name = "foobar-terraform-elb"
+  availability_zones = ["us-west-2a"]
+
+  listener {
+    instance_port = 80
+    instance_protocol = "http"
+    lb_port = 80
+    lb_protocol = "http"
+  }
+}
+`
+
+const testAccRoute53AliasRecord = `
+resource "aws_route53_zone" "main" {
+  name = "notexample.com"
+}
+
+resource "aws_route53_record" "origin" {
+  zone_id = "${aws_route53_zone.main.zone_id}"
+  name = "origin"
+  type = "A"
+  ttl = 5
+  records = ["127.0.0.1"]
+}
+
+resource "aws_route53_record" "alias" {
+  zone_id = "${aws_route53_zone.main.zone_id}"
+  name = "www"
+  type = "A"
+
+  alias {
+    zone_id = "${aws_route53_zone.main.zone_id}"
+    name = "${aws_route53_record.origin.name}.${aws_route53_zone.main.name}"
+    evaluate_target_health = true
+  }
+}
+`
+
+const testAccRoute53WeightedElbAliasRecord = `
+resource "aws_route53_zone" "main" {
+  name = "notexample.com"
+}
+
+resource "aws_elb" "live" {
+  name = "foobar-terraform-elb-live"
+  availability_zones = ["us-west-2a"]
+
+  listener {
+    instance_port = 80
+    instance_protocol = "http"
+    lb_port = 80
+    lb_protocol = "http"
+  }
+}
+
+resource "aws_route53_record" "elb_weighted_alias_live" {
+  zone_id = "${aws_route53_zone.main.zone_id}"
+  name = "www"
+  type = "A"
+
+  weight = 90
+  set_identifier = "live"
+
+  alias {
+    zone_id = "${aws_elb.live.zone_id}"
+    name = "${aws_elb.live.dns_name}"
+    evaluate_target_health = true
+  }
+}
+
+resource "aws_elb" "dev" {
+  name = "foobar-terraform-elb-dev"
+  availability_zones = ["us-west-2a"]
+
+  listener {
+    instance_port = 80
+    instance_protocol = "http"
+    lb_port = 80
+    lb_protocol = "http"
+  }
+}
+
+resource "aws_route53_record" "elb_weighted_alias_dev" {
+  zone_id = "${aws_route53_zone.main.zone_id}"
+  name = "www"
+  type = "A"
+
+  weight = 10
+  set_identifier = "dev"
+
+  alias {
+    zone_id = "${aws_elb.dev.zone_id}"
+    name = "${aws_elb.dev.dns_name}"
+    evaluate_target_health = true
+  }
+}
+`
+
+const testAccRoute53WeightedR53AliasRecord = `
+resource "aws_route53_zone" "main" {
+  name = "notexample.com"
+}
+
+resource "aws_route53_record" "blue_origin" {
+  zone_id = "${aws_route53_zone.main.zone_id}"
+  name = "blue-origin"
+  type = "CNAME"
+  ttl = 5
+  records = ["v1.terraform.io"]
+}
+
+resource "aws_route53_record" "r53_weighted_alias_live" {
+  zone_id = "${aws_route53_zone.main.zone_id}"
+  name = "www"
+  type = "CNAME"
+
+  weight = 90
+  set_identifier = "blue"
+
+  alias {
+    zone_id = "${aws_route53_zone.main.zone_id}"
+    name = "${aws_route53_record.blue_origin.name}.${aws_route53_zone.main.name}"
+    evaluate_target_health = false
+  }
+}
+
+resource "aws_route53_record" "green_origin" {
+  zone_id = "${aws_route53_zone.main.zone_id}"
+  name = "green-origin"
+  type = "CNAME"
+  ttl = 5
+  records = ["v2.terraform.io"]
+}
+
+resource "aws_route53_record" "r53_weighted_alias_dev" {
+  zone_id = "${aws_route53_zone.main.zone_id}"
+  name = "www"
+  type = "CNAME"
+
+  weight = 10
+  set_identifier = "green"
+
+  alias {
+    zone_id = "${aws_route53_zone.main.zone_id}"
+    name = "${aws_route53_record.green_origin.name}.${aws_route53_zone.main.name}"
+    evaluate_target_health = false
+  }
+}
+`

website/source/docs/providers/aws/r/route53_record.html.markdown

@@ -49,6 +49,39 @@ resource "aws_route53_record" "www-live" {
 }
 ```
 
+### Alias record
+See [related part of AWS Route53 Developer Guide](http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-choosing-alias-non-alias.html)
+to understand differences between alias and non-alias records.
+
+TTL for all alias records is [60 seconds](http://aws.amazon.com/route53/faqs/#dns_failover_do_i_need_to_adjust),
+you cannot change this, therefore `ttl` has to be ommitted in alias records.
+
+```
+resource "aws_elb" "main" {
+  name = "foobar-terraform-elb"
+  availability_zones = ["us-east-1c"]
+
+  listener {
+    instance_port = 80
+    instance_protocol = "http"
+    lb_port = 80
+    lb_protocol = "http"
+  }
+}
+
+resource "aws_route53_record" "www" {
+  zone_id = "${aws_route53_zone.primary.zone_id}"
+  name = "example.com"
+  type = "A"
+
+  alias {
+    name = "${aws_elb.main.dns_name}"
+    zone_id = "${aws_elb.main.zone_id}"
+    evaluate_target_health = true
+  }
+}
+```
+
 ## Argument Reference
 
 The following arguments are supported:
@@ -61,6 +94,15 @@ The following arguments are supported:
 * `weight` - (Optional) The weight of weighted record (0-255).
 * `set_identifier` - (Optional) Unique identifier to differentiate weighted
   record from one another. Required for each weighted record.
+* `alias` - (Optional) An alias block. Alias record documented below.
+
+Exactly one of `records` or `alias` must be specified: this determines whether it's an alias record.
+
+Alias records support the following:
+
+* `name` - (Required) DNS domain name for a CloudFront distribution, S3 bucket, ELB, or another resource record set in this hosted zone.
+* `zone_id` - (Required) Hosted zone ID for a CloudFront distribution, S3 bucket, ELB, or Route 53 hosted zone. See [`resource_elb.zone_id`](/docs/providers/aws/r/elb.html#zone_id) for example.
+* `evaluate_target_health` - (Required) Set to `true` if you want Route 53 to determine whether to respond to DNS queries using this resource record set by checking the health of the resource record set. Some resources have special requirements, see [related part of documentation](http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-values.html#rrsets-values-alias-evaluate-target-health).
 
 ## Attributes Reference