Merge #13188: aws_subnet_ids data source

builtin/providers/aws/data_source_aws_subnet_ids.go

@@ -0,0 +1,60 @@
+package aws
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/aws/aws-sdk-go/service/ec2"
+	"github.com/hashicorp/terraform/helper/schema"
+)
+
+func dataSourceAwsSubnetIDs() *schema.Resource {
+	return &schema.Resource{
+		Read: dataSourceAwsSubnetIDsRead,
+		Schema: map[string]*schema.Schema{
+			"vpc_id": &schema.Schema{
+				Type:     schema.TypeString,
+				Required: true,
+			},
+			"ids": &schema.Schema{
+				Type:     schema.TypeSet,
+				Computed: true,
+				Elem:     &schema.Schema{Type: schema.TypeString},
+				Set:      schema.HashString,
+			},
+		},
+	}
+}
+
+func dataSourceAwsSubnetIDsRead(d *schema.ResourceData, meta interface{}) error {
+	conn := meta.(*AWSClient).ec2conn
+
+	req := &ec2.DescribeSubnetsInput{}
+
+	req.Filters = buildEC2AttributeFilterList(
+		map[string]string{
+			"vpc-id": d.Get("vpc_id").(string),
+		},
+	)
+
+	log.Printf("[DEBUG] DescribeSubnets %s\n", req)
+	resp, err := conn.DescribeSubnets(req)
+	if err != nil {
+		return err
+	}
+
+	if resp == nil || len(resp.Subnets) == 0 {
+		return fmt.Errorf("no matching subnet found for vpc with id %s", d.Get("vpc_id").(string))
+	}
+
+	subnets := make([]string, 0)
+
+	for _, subnet := range resp.Subnets {
+		subnets = append(subnets, *subnet.SubnetId)
+	}
+
+	d.SetId(d.Get("vpc_id").(string))
+	d.Set("ids", subnets)
+
+	return nil
+}

builtin/providers/aws/data_source_aws_subnet_ids_test.go

@@ -0,0 +1,68 @@
+package aws
+
+import (
+	"testing"
+
+	"github.com/hashicorp/terraform/helper/resource"
+)
+
+func TestAccDataSourceAwsSubnetIDs(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:  func() { testAccPreCheck(t) },
+		Providers: testAccProviders,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccDataSourceAwsSubnetIDsConfig,
+			},
+			{
+				Config: testAccDataSourceAwsSubnetIDsConfigWithDataSource,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr("data.aws_subnet_ids.selected", "ids.#", "1"),
+				),
+			},
+		},
+	})
+}
+
+const testAccDataSourceAwsSubnetIDsConfigWithDataSource = `
+resource "aws_vpc" "test" {
+  cidr_block = "172.16.0.0/16"
+
+  tags {
+    Name = "terraform-testacc-subnet-ids-data-source"
+  }
+}
+
+resource "aws_subnet" "test" {
+  vpc_id            = "${aws_vpc.test.id}"
+  cidr_block        = "172.16.123.0/24"
+  availability_zone = "us-west-2a"
+
+  tags {
+    Name = "terraform-testacc-subnet-ids-data-source"
+  }
+}
+
+data "aws_subnet_ids" "selected" {
+  vpc_id = "${aws_vpc.test.id}"
+}
+`
+const testAccDataSourceAwsSubnetIDsConfig = `
+resource "aws_vpc" "test" {
+  cidr_block = "172.16.0.0/16"
+
+  tags {
+    Name = "terraform-testacc-subnet-ids-data-source"
+  }
+}
+
+resource "aws_subnet" "test" {
+  vpc_id            = "${aws_vpc.test.id}"
+  cidr_block        = "172.16.123.0/24"
+  availability_zone = "us-west-2a"
+
+  tags {
+    Name = "terraform-testacc-subnet-ids-data-source"
+  }
+}
+`

builtin/providers/aws/provider.go

@@ -188,6 +188,7 @@ func Provider() terraform.ResourceProvider {
 			"aws_s3_bucket_object":         dataSourceAwsS3BucketObject(),
 			"aws_sns_topic":                dataSourceAwsSnsTopic(),
 			"aws_subnet":                   dataSourceAwsSubnet(),
+			"aws_subnet_ids":               dataSourceAwsSubnetIDs(),
 			"aws_security_group":           dataSourceAwsSecurityGroup(),
 			"aws_vpc":                      dataSourceAwsVpc(),
 			"aws_vpc_endpoint":             dataSourceAwsVpcEndpoint(),

website/source/docs/providers/aws/d/subnet_ids.html.markdown

@@ -0,0 +1,40 @@
+---
+layout: "aws"
+page_title: "AWS: aws_subnet_ids"
+sidebar_current: "docs-aws-datasource-subnet-ids"
+description: |-
+    Provides a list of subnet Ids for a VPC
+---
+
+# aws\_subnet\_ids
+
+`aws_subnet_ids` provides a list of ids for a vpc_id
+
+This resource can be useful for getting back a list of subnet ids for a vpc.
+
+## Example Usage
+
+The following shows outputing all cidr blocks for every subnet id in a vpc.
+
+```
+data "aws_subnet_ids" "example" {
+  vpc_id = "${var.vpc_id}"
+}
+
+data "aws_subnet" "example" {
+  count = "${length(data.aws_subnet_ids.example.ids)}"
+  id = "${aws_subnet_ids.example.ids[count.index]}"
+}
+
+output "subnet_cidr_blocks" {
+  value = ["${data.aws_subnet.example.*.cidr_block}"]
+}
+```
+
+## Argument Reference
+
+* `vpc_id` - (Required) The VPC ID that you want to filter from.
+
+## Attributes Reference
+
+* `ids` - Is a list of all the subnet ids found. If none found. This data source will fail out.

website/source/layouts/aws.erb

@@ -119,6 +119,9 @@
                         <li<%= sidebar_current("docs-aws-datasource-subnet") %>>
                             <a href="/docs/providers/aws/d/subnet.html">aws_subnet</a>
                         </li>
+                        <li<%= sidebar_current("docs-aws-datasource-subnet-ids") %>>
+                            <a href="/docs/providers/aws/d/subnet_ids.html">aws_subnet_ids</a>
+                        </li>
                         <li<%= sidebar_current("docs-aws-datasource-vpc") %>>
                             <a href="/docs/providers/aws/d/vpc.html">aws_vpc</a>
                         </li>