First pass at aws_vpn_gateway resource

Uses the aws-sdk-go module and is based on the way the existing
aws_internet_gateway resource works.

builtin/providers/aws/resource_aws_vpn_gateway.go

@@ -0,0 +1,331 @@
+package aws
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/hashicorp/aws-sdk-go/aws"
+	"github.com/hashicorp/aws-sdk-go/gen/ec2"
+	"github.com/hashicorp/terraform/helper/resource"
+	"github.com/hashicorp/terraform/helper/schema"
+)
+
+func resourceAwsVpnGateway() *schema.Resource {
+	return &schema.Resource{
+		Create: resourceAwsVpnGatewayCreate,
+		Read:   resourceAwsVpnGatewayRead,
+		Update: resourceAwsVpnGatewayUpdate,
+		Delete: resourceAwsVpnGatewayDelete,
+
+		Schema: map[string]*schema.Schema{
+			"availability_zone": &schema.Schema{
+				Type:     schema.TypeString,
+				Optional: true,
+				ForceNew: true,
+			},
+
+			"type": &schema.Schema{
+				Type:     schema.TypeString,
+                Required: true,
+				ForceNew: true,
+			},
+
+            "vpc_id": &schema.Schema{
+                Type:     schema.TypeString,
+                Optional: true,
+            },
+
+		},
+	}
+}
+
+func resourceAwsVpnGatewayCreate(d *schema.ResourceData, meta interface{}) error {
+    ec2conn := meta.(*AWSClient).awsEC2conn
+
+    createOpts := &ec2.CreateVPNGatewayRequest{
+        AvailabilityZone: aws.String(d.Get("availability_zone").(string)),
+        Type:        aws.String(d.Get("type").(string)),
+    }
+
+    // Create the VPN gateway
+    log.Printf("[DEBUG] Creating VPN gateway")
+    resp, err := ec2conn.CreateVPNGateway(createOpts)
+    if err != nil {
+        return fmt.Errorf("Error creating VPN gateway: %s", err)
+    }
+
+    // Get the ID and store it
+    vpnGateway := resp.VPNGateway
+    d.SetId(*vpnGateway.VPNGatewayID)
+    log.Printf("[INFO] VPN Gateway ID: %s", vpnGateway.VPNGatewayID)
+
+    // Attach the VPN gateway to the correct VPC
+    return resourceAwsVpnGatewayUpdate(d, meta)
+}
+
+func resourceAwsVpnGatewayRead(d *schema.ResourceData, meta interface{}) error {
+    ec2conn := meta.(*AWSClient).awsEC2conn
+
+    resp, err := ec2conn.DescribeVPNGateways(&ec2.DescribeVPNGatewaysRequest{
+        VPNGatewayIDs: []string{d.Id()},
+    })
+
+    if err != nil {
+        if ec2err, ok := err.(aws.APIError); ok && ec2err.Code == "InvalidVpnGatewayID.NotFound " {
+            // Update state to indicate the subnet no longer exists.
+            d.SetId("")
+            return nil
+        }
+        return err
+    }
+    if resp == nil {
+        return nil
+    }
+
+    vpnGateway := &resp.VPNGateways[0]
+    if len(vpnGateway.VPCAttachments) == 0 {
+        // VPN gateway exists but not attached to the VPC
+        d.Set("vpc_id", "")
+    } else {
+        d.Set("vpc_id", vpnGateway.VPCAttachments[0].VPCID)
+    }
+    d.Set("availability_zone", vpnGateway.AvailabilityZone)
+    d.Set("type", vpnGateway.Type)
+    d.Set("tags", tagsToMapSDK(vpnGateway.Tags))
+
+    return nil
+}
+
+func resourceAwsVpnGatewayUpdate(d *schema.ResourceData, meta interface{}) error {
+    if d.HasChange("vpc_id") {
+        // If we're already attached, detach it first
+        if err := resourceAwsVpnGatewayDetach(d, meta); err != nil {
+            return err
+        }
+
+        // Attach the VPN gateway to the new vpc
+        if err := resourceAwsVpnGatewayAttach(d, meta); err != nil {
+            return err
+        }
+    }
+
+    ec2conn := meta.(*AWSClient).awsEC2conn
+
+    d.Partial(true)
+
+    if err := setTagsSDK(ec2conn, d); err != nil {
+        return err
+    } else {
+        d.SetPartial("tags")
+    }
+
+    d.Partial(false)
+
+    return resourceAwsVpnGatewayRead(d, meta)
+}
+
+func resourceAwsVpnGatewayDelete(d *schema.ResourceData, meta interface{}) error {
+    ec2conn := meta.(*AWSClient).awsEC2conn
+
+    // Detach if it is attached
+    if err := resourceAwsVpnGatewayDetach(d, meta); err != nil {
+        return err
+    }
+
+    log.Printf("[INFO] Deleting VPN gateway: %s", d.Id())
+
+    return resource.Retry(5*time.Minute, func() error {
+        err := ec2conn.DeleteVPNGateway(&ec2.DeleteVPNGatewayRequest{
+            VPNGatewayID: aws.String(d.Id()),
+        })
+        if err == nil {
+            return nil
+        }
+
+        ec2err, ok := err.(*aws.APIError)
+        if !ok {
+            return err
+        }
+
+        switch ec2err.Code {
+        case "InvalidVpnGatewayID.NotFound":
+            return nil
+        case "DependencyViolation":
+            return err // retry
+        }
+
+        return resource.RetryError{Err: err}
+    })
+
+    return nil
+}
+
+func resourceAwsVpnGatewayAttach(d *schema.ResourceData, meta interface{}) error {
+    ec2conn := meta.(*AWSClient).awsEC2conn
+
+    if d.Get("vpc_id").(string) == "" {
+        log.Printf(
+            "[DEBUG] Not attaching VPN Gateway '%s' as no VPC ID is set",
+            d.Id())
+        return nil
+    }
+
+    log.Printf(
+        "[INFO] Attaching VPN Gateway '%s' to VPC '%s'",
+        d.Id(),
+        d.Get("vpc_id").(string))
+
+    _, err := ec2conn.AttachVPNGateway(&ec2.AttachVPNGatewayRequest{
+        VPNGatewayID: aws.String(d.Id()),
+        VPCID:        aws.String(d.Get("vpc_id").(string)),
+    })
+    if err != nil {
+        return err
+    }
+
+    log.Printf("[DEBUG] Waiting for VPN gateway (%s) to attach", d.Id())
+    stateConf := &resource.StateChangeConf{
+        Pending: []string{"detached", "attaching"},
+        Target:  "available",
+        Refresh: VpnGatewayAttachStateRefreshFunc(ec2conn, d.Id(), "available"),
+        Timeout: 1 * time.Minute,
+    }
+    if _, err := stateConf.WaitForState(); err != nil {
+        return fmt.Errorf(
+            "Error waiting for VPN gateway (%s) to attach: %s",
+            d.Id(), err)
+    }
+
+    return nil
+}
+
+func resourceAwsVpnGatewayDetach(d *schema.ResourceData, meta interface{}) error {
+    ec2conn := meta.(*AWSClient).awsEC2conn
+
+    // Get the old VPC ID to detach from
+    vpcID, _ := d.GetChange("vpc_id")
+
+    if vpcID.(string) == "" {
+        log.Printf(
+            "[DEBUG] Not detaching VPN Gateway '%s' as no VPC ID is set",
+            d.Id())
+        return nil
+    }
+
+    log.Printf(
+        "[INFO] Detaching VPN Gateway '%s' from VPC '%s'",
+        d.Id(),
+        vpcID.(string))
+
+    wait := true
+    err := ec2conn.DetachVPNGateway(&ec2.DetachVPNGatewayRequest{
+        VPNGatewayID: aws.String(d.Id()),
+        VPCID:        aws.String(d.Get("vpc_id").(string)),
+    })
+    if err != nil {
+        ec2err, ok := err.(*aws.APIError)
+        if ok {
+            if ec2err.Code == "InvalidVpnGatewayID.NotFound" {
+                err = nil
+                wait = false
+            } else if ec2err.Code == "InvalidVpnGatewayAttachment.NotFound" {
+                err = nil
+                wait = false
+            }
+        }
+
+        if err != nil {
+            return err
+        }
+    }
+
+    if !wait {
+        return nil
+    }
+
+    // Wait for it to be fully detached before continuing
+    log.Printf("[DEBUG] Waiting for VPN gateway (%s) to detach", d.Id())
+    stateConf := &resource.StateChangeConf{
+        Pending: []string{"attached", "detaching", "available"},
+        Target:  "detached",
+        Refresh: VpnGatewayAttachStateRefreshFunc(ec2conn, d.Id(), "detached"),
+        Timeout: 1 * time.Minute,
+    }
+    if _, err := stateConf.WaitForState(); err != nil {
+        return fmt.Errorf(
+            "Error waiting for vpn gateway (%s) to detach: %s",
+            d.Id(), err)
+    }
+
+    return nil
+}
+
+
+// VpnGatewayStateRefreshFunc returns a resource.StateRefreshFunc that is used to watch a VPNGateway.
+func VpnGatewayStateRefreshFunc(conn *ec2.EC2, id string) resource.StateRefreshFunc {
+    return func() (interface{}, string, error) {
+        resp, err := conn.DescribeVPNGateways(&ec2.DescribeVPNGatewaysRequest{
+            VPNGatewayIDs: []string{id},
+        })
+        if err != nil {
+            if ec2err, ok := err.(aws.APIError); ok && ec2err.Code == "InvalidVpnGatewayID.NotFound" {
+                resp = nil
+            } else {
+                log.Printf("[ERROR] Error on VpnGatewayStateRefresh: %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
+        }
+
+        vpnGateway := &resp.VPNGateways[0]
+        return vpnGateway, *vpnGateway.State, nil
+    }
+}
+
+// VpnGatewayAttachStateRefreshFunc returns a resource.StateRefreshFunc that is used to watch 
+// the state of a VPN gateway's attachment
+func VpnGatewayAttachStateRefreshFunc(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.DescribeVPNGateways(&ec2.DescribeVPNGatewaysRequest{
+            VPNGatewayIDs: []string{id},
+        })
+        if err != nil {
+            if ec2err, ok := err.(aws.APIError); ok && ec2err.Code == "InvalidVpnGatewayID.NotFound" {
+                resp = nil
+            } else {
+                log.Printf("[ERROR] Error on VpnGatewayStateRefresh: %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
+        }
+
+        vpnGateway := &resp.VPNGateways[0]
+
+        if time.Now().Sub(start) > 10*time.Second {
+            return vpnGateway, expected, nil
+        }
+
+        if len(vpnGateway.VPCAttachments) == 0 {
+            // No attachments, we're detached
+            return vpnGateway, "detached", nil
+        }
+
+        return vpnGateway, *vpnGateway.VPCAttachments[0].State, nil
+    }
+}