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resource_aws_internet_gateway.go
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resource_aws_internet_gateway.go
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package aws
import (
"fmt"
"log"
"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 resourceAwsInternetGateway() *schema.Resource {
return &schema.Resource{
Create: resourceAwsInternetGatewayCreate,
Read: resourceAwsInternetGatewayRead,
Update: resourceAwsInternetGatewayUpdate,
Delete: resourceAwsInternetGatewayDelete,
Schema: map[string]*schema.Schema{
"vpc_id": &schema.Schema{
Type: schema.TypeString,
Optional: true,
},
"tags": tagsSchema(),
},
}
}
func resourceAwsInternetGatewayCreate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
// Create the gateway
log.Printf("[DEBUG] Creating internet gateway")
var err error
resp, err := conn.CreateInternetGateway(nil)
if err != nil {
return fmt.Errorf("Error creating internet gateway: %s", err)
}
// Get the ID and store it
ig := *resp.InternetGateway
d.SetId(*ig.InternetGatewayId)
log.Printf("[INFO] InternetGateway ID: %s", d.Id())
err = setTags(conn, d)
if err != nil {
return err
}
// Attach the new gateway to the correct vpc
return resourceAwsInternetGatewayAttach(d, meta)
}
func resourceAwsInternetGatewayRead(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
igRaw, _, err := IGStateRefreshFunc(conn, d.Id())()
if err != nil {
return err
}
if igRaw == nil {
// Seems we have lost our internet gateway
d.SetId("")
return nil
}
ig := igRaw.(*ec2.InternetGateway)
if len(ig.Attachments) == 0 {
// Gateway exists but not attached to the VPC
d.Set("vpc_id", "")
} else {
d.Set("vpc_id", ig.Attachments[0].VpcId)
}
d.Set("tags", tagsToMap(ig.Tags))
return nil
}
func resourceAwsInternetGatewayUpdate(d *schema.ResourceData, meta interface{}) error {
if d.HasChange("vpc_id") {
// If we're already attached, detach it first
if err := resourceAwsInternetGatewayDetach(d, meta); err != nil {
return err
}
// Attach the gateway to the new vpc
if err := resourceAwsInternetGatewayAttach(d, meta); err != nil {
return err
}
}
conn := meta.(*AWSClient).ec2conn
if err := setTags(conn, d); err != nil {
return err
}
d.SetPartial("tags")
return nil
}
func resourceAwsInternetGatewayDelete(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
// Detach if it is attached
if err := resourceAwsInternetGatewayDetach(d, meta); err != nil {
return err
}
log.Printf("[INFO] Deleting Internet Gateway: %s", d.Id())
return resource.Retry(5*time.Minute, func() error {
_, err := conn.DeleteInternetGateway(&ec2.DeleteInternetGatewayInput{
InternetGatewayId: aws.String(d.Id()),
})
if err == nil {
return nil
}
ec2err, ok := err.(awserr.Error)
if !ok {
return err
}
switch ec2err.Code() {
case "InvalidInternetGatewayID.NotFound":
return nil
case "DependencyViolation":
return err // retry
}
return resource.RetryError{Err: err}
})
}
func resourceAwsInternetGatewayAttach(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
if d.Get("vpc_id").(string) == "" {
log.Printf(
"[DEBUG] Not attaching Internet Gateway '%s' as no VPC ID is set",
d.Id())
return nil
}
log.Printf(
"[INFO] Attaching Internet Gateway '%s' to VPC '%s'",
d.Id(),
d.Get("vpc_id").(string))
_, err := conn.AttachInternetGateway(&ec2.AttachInternetGatewayInput{
InternetGatewayId: aws.String(d.Id()),
VpcId: aws.String(d.Get("vpc_id").(string)),
})
if err != nil {
return err
}
// A note on the states below: the AWS docs (as of July, 2014) say
// that the states would be: attached, attaching, detached, detaching,
// but when running, I noticed that the state is usually "available" when
// it is attached.
// Wait for it to be fully attached before continuing
log.Printf("[DEBUG] Waiting for internet gateway (%s) to attach", d.Id())
stateConf := &resource.StateChangeConf{
Pending: []string{"detached", "attaching"},
Target: []string{"available"},
Refresh: IGAttachStateRefreshFunc(conn, d.Id(), "available"),
Timeout: 1 * time.Minute,
}
if _, err := stateConf.WaitForState(); err != nil {
return fmt.Errorf(
"Error waiting for internet gateway (%s) to attach: %s",
d.Id(), err)
}
return nil
}
func resourceAwsInternetGatewayDetach(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).ec2conn
// Get the old VPC ID to detach from
vpcID, _ := d.GetChange("vpc_id")
if vpcID.(string) == "" {
log.Printf(
"[DEBUG] Not detaching Internet Gateway '%s' as no VPC ID is set",
d.Id())
return nil
}
log.Printf(
"[INFO] Detaching Internet Gateway '%s' from VPC '%s'",
d.Id(),
vpcID.(string))
// Wait for it to be fully detached before continuing
log.Printf("[DEBUG] Waiting for internet gateway (%s) to detach", d.Id())
stateConf := &resource.StateChangeConf{
Pending: []string{"detaching"},
Target: []string{"detached"},
Refresh: detachIGStateRefreshFunc(conn, d.Id(), vpcID.(string)),
Timeout: 15 * time.Minute,
Delay: 10 * time.Second,
NotFoundChecks: 30,
}
if _, err := stateConf.WaitForState(); err != nil {
return fmt.Errorf(
"Error waiting for internet gateway (%s) to detach: %s",
d.Id(), err)
}
return nil
}
// InstanceStateRefreshFunc returns a resource.StateRefreshFunc that is used to watch
// an EC2 instance.
func detachIGStateRefreshFunc(conn *ec2.EC2, instanceID, vpcID string) resource.StateRefreshFunc {
return func() (interface{}, string, error) {
_, err := conn.DetachInternetGateway(&ec2.DetachInternetGatewayInput{
InternetGatewayId: aws.String(instanceID),
VpcId: aws.String(vpcID),
})
if err != nil {
ec2err, ok := err.(awserr.Error)
if ok {
if ec2err.Code() == "InvalidInternetGatewayID.NotFound" {
return nil, "Not Found", err
} else if ec2err.Code() == "Gateway.NotAttached" {
return "detached", "detached", nil
} else if ec2err.Code() == "DependencyViolation" {
return nil, "detaching", nil
}
}
}
// DetachInternetGateway only returns an error, so if it's nil, assume we're
// detached
return "detached", "detached", nil
}
}
// IGStateRefreshFunc returns a resource.StateRefreshFunc that is used to watch
// an internet gateway.
func IGStateRefreshFunc(conn *ec2.EC2, id string) resource.StateRefreshFunc {
return func() (interface{}, string, error) {
resp, err := conn.DescribeInternetGateways(&ec2.DescribeInternetGatewaysInput{
InternetGatewayIds: []*string{aws.String(id)},
})
if err != nil {
ec2err, ok := err.(awserr.Error)
if ok && ec2err.Code() == "InvalidInternetGatewayID.NotFound" {
resp = nil
} else {
log.Printf("[ERROR] Error on IGStateRefresh: %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
}
ig := resp.InternetGateways[0]
return ig, "available", nil
}
}
// IGAttachStateRefreshFunc returns a resource.StateRefreshFunc that is used
// watch the state of an internet gateway's attachment.
func IGAttachStateRefreshFunc(conn *ec2.EC2, id string, expected string) resource.StateRefreshFunc {
var start time.Time
return func() (interface{}, string, error) {
if start.IsZero() {
start = time.Now()
}
resp, err := conn.DescribeInternetGateways(&ec2.DescribeInternetGatewaysInput{
InternetGatewayIds: []*string{aws.String(id)},
})
if err != nil {
ec2err, ok := err.(awserr.Error)
if ok && ec2err.Code() == "InvalidInternetGatewayID.NotFound" {
resp = nil
} else {
log.Printf("[ERROR] Error on IGStateRefresh: %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
}
ig := resp.InternetGateways[0]
if len(ig.Attachments) == 0 {
// No attachments, we're detached
return ig, "detached", nil
}
return ig, *ig.Attachments[0].State, nil
}
}