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resource_aws_nat_gateway.go
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resource_aws_nat_gateway.go
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package aws
import (
"fmt"
"log"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/hashicorp/terraform/helper/resource"
"github.com/hashicorp/terraform/helper/schema"
)
func resourceAwsNatGateway() *schema.Resource {
return &schema.Resource{
Create: resourceAwsNatGatewayCreate,
Read: resourceAwsNatGatewayRead,
Delete: resourceAwsNatGatewayDelete,
Importer: &schema.ResourceImporter{
State: schema.ImportStatePassthrough,
},
Schema: map[string]*schema.Schema{
"allocation_id": &schema.Schema{
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"subnet_id": &schema.Schema{
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"network_interface_id": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
},
"private_ip": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
},
"public_ip": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
},
},
}
}
func resourceAwsNatGatewayCreate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
// Create the NAT Gateway
createOpts := &ec2.CreateNatGatewayInput{
AllocationId: aws.String(d.Get("allocation_id").(string)),
SubnetId: aws.String(d.Get("subnet_id").(string)),
}
log.Printf("[DEBUG] Create NAT Gateway: %s", *createOpts)
natResp, err := conn.CreateNatGateway(createOpts)
if err != nil {
return fmt.Errorf("Error creating NAT Gateway: %s", err)
}
// Get the ID and store it
ng := natResp.NatGateway
d.SetId(*ng.NatGatewayId)
log.Printf("[INFO] NAT Gateway ID: %s", d.Id())
// Wait for the NAT Gateway to become available
log.Printf("[DEBUG] Waiting for NAT Gateway (%s) to become available", d.Id())
stateConf := &resource.StateChangeConf{
Pending: []string{"pending"},
Target: []string{"available"},
Refresh: NGStateRefreshFunc(conn, d.Id()),
Timeout: 10 * time.Minute,
}
if _, err := stateConf.WaitForState(); err != nil {
return fmt.Errorf("Error waiting for NAT Gateway (%s) to become available: %s", d.Id(), err)
}
// Update our attributes and return
return resourceAwsNatGatewayRead(d, meta)
}
func resourceAwsNatGatewayRead(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
// Refresh the NAT Gateway state
ngRaw, state, err := NGStateRefreshFunc(conn, d.Id())()
if err != nil {
return err
}
status := map[string]bool{
"deleted": true,
"deleting": true,
"failed": true,
}
if _, ok := status[strings.ToLower(state)]; ngRaw == nil || ok {
log.Printf("[INFO] Removing %s from Terraform state as it is not found or in the deleted state.", d.Id())
d.SetId("")
return nil
}
// Set NAT Gateway attributes
ng := ngRaw.(*ec2.NatGateway)
d.Set("subnet_id", ng.SubnetId)
// Address
address := ng.NatGatewayAddresses[0]
d.Set("allocation_id", address.AllocationId)
d.Set("network_interface_id", address.NetworkInterfaceId)
d.Set("private_ip", address.PrivateIp)
d.Set("public_ip", address.PublicIp)
return nil
}
func resourceAwsNatGatewayDelete(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
deleteOpts := &ec2.DeleteNatGatewayInput{
NatGatewayId: aws.String(d.Id()),
}
log.Printf("[INFO] Deleting NAT Gateway: %s", d.Id())
_, err := conn.DeleteNatGateway(deleteOpts)
if err != nil {
ec2err, ok := err.(awserr.Error)
if !ok {
return err
}
if ec2err.Code() == "NatGatewayNotFound" {
return nil
}
return err
}
stateConf := &resource.StateChangeConf{
Pending: []string{"deleting"},
Target: []string{"deleted"},
Refresh: NGStateRefreshFunc(conn, d.Id()),
Timeout: 30 * time.Minute,
Delay: 10 * time.Second,
MinTimeout: 10 * time.Second,
}
_, stateErr := stateConf.WaitForState()
if stateErr != nil {
return fmt.Errorf("Error waiting for NAT Gateway (%s) to delete: %s", d.Id(), err)
}
return nil
}
// NGStateRefreshFunc returns a resource.StateRefreshFunc that is used to watch
// a NAT Gateway.
func NGStateRefreshFunc(conn *ec2.EC2, id string) resource.StateRefreshFunc {
return func() (interface{}, string, error) {
opts := &ec2.DescribeNatGatewaysInput{
NatGatewayIds: []*string{aws.String(id)},
}
resp, err := conn.DescribeNatGateways(opts)
if err != nil {
if ec2err, ok := err.(awserr.Error); ok && ec2err.Code() == "NatGatewayNotFound" {
resp = nil
} else {
log.Printf("Error on NGStateRefresh: %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
}
ng := resp.NatGateways[0]
return ng, *ng.State, nil
}
}