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 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") 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 = setTagsSDK(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", tagsToMapSDK(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 := setTagsSDK(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.(aws.APIError) 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: "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: "detached", Refresh: detachIGStateRefreshFunc(conn, d.Id(), vpcID.(string)), Timeout: 2 * time.Minute, Delay: 10 * time.Second, } 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.(aws.APIError) 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.(aws.APIError) 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.(aws.APIError) 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 } }