package aws import ( "fmt" "log" "time" "github.com/awslabs/aws-sdk-go/aws" "github.com/awslabs/aws-sdk-go/service/ec2" "github.com/hashicorp/terraform/helper/resource" "github.com/hashicorp/terraform/helper/schema" ) func resourceAwsSubnet() *schema.Resource { return &schema.Resource{ Create: resourceAwsSubnetCreate, Read: resourceAwsSubnetRead, Update: resourceAwsSubnetUpdate, Delete: resourceAwsSubnetDelete, Schema: map[string]*schema.Schema{ "vpc_id": &schema.Schema{ Type: schema.TypeString, Optional: true, ForceNew: true, Computed: true, }, "cidr_block": &schema.Schema{ Type: schema.TypeString, Required: true, ForceNew: true, }, "availability_zone": &schema.Schema{ Type: schema.TypeString, Optional: true, Computed: true, ForceNew: true, }, "map_public_ip_on_launch": &schema.Schema{ Type: schema.TypeBool, Optional: true, Default: false, }, "tags": tagsSchema(), }, } } func resourceAwsSubnetCreate(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).ec2conn createOpts := &ec2.CreateSubnetInput{ AvailabilityZone: aws.String(d.Get("availability_zone").(string)), CIDRBlock: aws.String(d.Get("cidr_block").(string)), VPCID: aws.String(d.Get("vpc_id").(string)), } resp, err := conn.CreateSubnet(createOpts) if err != nil { return fmt.Errorf("Error creating subnet: %s", err) } // Get the ID and store it subnet := resp.Subnet d.SetId(*subnet.SubnetID) log.Printf("[INFO] Subnet ID: %s", *subnet.SubnetID) // Wait for the Subnet to become available log.Printf("[DEBUG] Waiting for subnet (%s) to become available", *subnet.SubnetID) stateConf := &resource.StateChangeConf{ Pending: []string{"pending"}, Target: "available", Refresh: SubnetStateRefreshFunc(conn, *subnet.SubnetID), Timeout: 10 * time.Minute, } _, err = stateConf.WaitForState() if err != nil { return fmt.Errorf( "Error waiting for subnet (%s) to become ready: %s", d.Id(), err) } return resourceAwsSubnetUpdate(d, meta) } func resourceAwsSubnetRead(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).ec2conn resp, err := conn.DescribeSubnets(&ec2.DescribeSubnetsInput{ SubnetIDs: []*string{aws.String(d.Id())}, }) if err != nil { if ec2err, ok := err.(aws.APIError); ok && ec2err.Code == "InvalidSubnetID.NotFound" { // Update state to indicate the subnet no longer exists. d.SetId("") return nil } return err } if resp == nil { return nil } subnet := resp.Subnets[0] d.Set("vpc_id", subnet.VPCID) d.Set("availability_zone", subnet.AvailabilityZone) d.Set("cidr_block", subnet.CIDRBlock) d.Set("map_public_ip_on_launch", subnet.MapPublicIPOnLaunch) d.Set("tags", tagsToMap(subnet.Tags)) return nil } func resourceAwsSubnetUpdate(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).ec2conn d.Partial(true) if err := setTags(conn, d); err != nil { return err } else { d.SetPartial("tags") } if d.HasChange("map_public_ip_on_launch") { modifyOpts := &ec2.ModifySubnetAttributeInput{ SubnetID: aws.String(d.Id()), MapPublicIPOnLaunch: &ec2.AttributeBooleanValue{ Value: aws.Boolean(d.Get("map_public_ip_on_launch").(bool)), }, } log.Printf("[DEBUG] Subnet modify attributes: %#v", modifyOpts) _, err := conn.ModifySubnetAttribute(modifyOpts) if err != nil { return err } else { d.SetPartial("map_public_ip_on_launch") } } d.Partial(false) return resourceAwsSubnetRead(d, meta) } func resourceAwsSubnetDelete(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).ec2conn log.Printf("[INFO] Deleting subnet: %s", d.Id()) req := &ec2.DeleteSubnetInput{ SubnetID: aws.String(d.Id()), } wait := resource.StateChangeConf{ Pending: []string{"pending"}, Target: "destroyed", Timeout: 5 * time.Minute, MinTimeout: 1 * time.Second, Refresh: func() (interface{}, string, error) { _, err := conn.DeleteSubnet(req) if err != nil { if apiErr, ok := err.(aws.APIError); ok { if apiErr.Code == "DependencyViolation" { // There is some pending operation, so just retry // in a bit. return 42, "pending", nil } if apiErr.Code == "InvalidSubnetID.NotFound" { return 42, "destroyed", nil } } return 42, "failure", err } return 42, "destroyed", nil }, } if _, err := wait.WaitForState(); err != nil { return fmt.Errorf("Error deleting subnet: %s", err) } return nil } // SubnetStateRefreshFunc returns a resource.StateRefreshFunc that is used to watch a Subnet. func SubnetStateRefreshFunc(conn *ec2.EC2, id string) resource.StateRefreshFunc { return func() (interface{}, string, error) { resp, err := conn.DescribeSubnets(&ec2.DescribeSubnetsInput{ SubnetIDs: []*string{aws.String(id)}, }) if err != nil { if ec2err, ok := err.(aws.APIError); ok && ec2err.Code == "InvalidSubnetID.NotFound" { resp = nil } else { log.Printf("Error on SubnetStateRefresh: %s", err) return nil, "", err } } if resp == nil { // Sometimes AWS just has consistency issues and doesn't see // our instance yet. Return an empty state. return nil, "", nil } subnet := resp.Subnets[0] return subnet, *subnet.State, nil } }